Inhibition of CYP2J2 in human liver microsomes using 7 probe cocktail containing phenacetin, paclitaxel, diclofenac, S-mephenytoin, dextromethorphan, astemizole and midazolam after 8 mins by LC-MS/MS analysis
Liver
IC50 < 100.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
DANAZOL
Mixed inhibition of recombinant CYP2J2 (unknown origin)-mediated astemizole O-demethylation in presence of NADPH
—
Ki = 20.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
DANAZOL
Inhibition of recombinant CYP2J2 (unknown origin)-mediated astemizole O-demethylation preincubated for 30 mins followed by substrate addition in presence of NADPH
—
IC50 = 12.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
DANAZOL
Inhibition of CYP2J2-mediated astemizole O-demethylation in human liver microsomes after 8 mins by LC-MS/MS analysis
Liver
IC50 < 100.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
DANAZOL
Inhibition of recombinant CYP2J2 (unknown origin)-mediated astemizole O-demethylation in presence of NADPH
—
IC50 = 19.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
DANAZOL
Inhibition of recombinant CYP2J2 (unknown origin)-mediated terfenadine hydroxylation in presence of NADPH
—
IC50 = 77.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
MICONAZOLE
Inhibition of CYP2J2 in human liver microsomes using 7 probe cocktail containing phenacetin, paclitaxel, diclofenac, S-mephenytoin, dextromethorphan, astemizole and midazolam after 8 mins by LC-MS/MS analysis
Liver
IC50 = 640.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
MICONAZOLE
Inhibition of CYP2J2-mediated astemizole O-demethylation in human liver microsomes after 8 mins by LC-MS/MS analysis
Liver
IC50 = 580.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
TELMISARTAN
Non-competitive inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation by LC-MS/MS method and Dixon plot
—
Ki = 100.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
TELMISARTAN
Inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation by LC-MS/MS method
—
IC50 = 420.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
TELMISARTAN
Inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation reduction in astemizole O-demethylation after 30 mins by LC-MS/MS method in absence of 1 mM NADPH
—
IC50 = 540.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
TELMISARTAN
Inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation after 30 mins by LC-MS/MS method in presence of 1 mM NADPH
—
IC50 = 540.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
TELMISARTAN
Mixed type inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation by LC-MS/MS method
—
Ki = 190.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
AMODIAQUINE
Inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation by LC-MS/MS method
—
IC50 = 990.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
FLUNARIZINE
Non-competitive inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation by LC-MS/MS method and Dixon plot
—
Ki = 100.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
FLUNARIZINE
Inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation by LC-MS/MS method
—
IC50 = 940.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
FLUNARIZINE
Inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation reduction in astemizole O-demethylation after 30 mins by LC-MS/MS method in absence of 1 mM NADPH
—
IC50 = 950.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
FLUNARIZINE
Inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation after 30 mins by LC-MS/MS method in presence of 1 mM NADPH
—
IC50 = 760.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
FLUNARIZINE
Non-competitive inhibition of human recombinant CYP2J2 assessed as reduction in astemizole O-demethylation by LC-MS/MS method
—
Ki = 130.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
VORAPAXAR
Activity of human recombinant CYP2J2 assessed as enzyme-mediated ((4aR,6R)-9-{2-[(1R,4S)-5-((S)-3-Fluoro-phenyl)-pyridin-2-yl]-vinyl}-1-methyl-3-oxo-dodecahydro-naphtho[2,3-c]furan-6-yl)-carbamic acid(R)-2-hydroxy-ethyl ester formation at 10 uM after 120 mins by LC-MS/MS analysis in presence of astemizole
—
Inhibition = 87.0 %
Reference
Title : Identification of human liver cytochrome P450 enzymes involved in the metabolism of SCH 530348 (Vorapaxar), a potent oral thrombin protease-activated receptor 1 antagonist. Authors : Ghosal A, Lu X, Penner N, Gao L, Ramanathan R, Chowdhury SK, Kishnani NS, Alton KB. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Vorapaxar (SCH 530348), a potent oral thrombin protease-activated receptor 1 antagonist, is being developed as an antiplatelet agent for patients with established vascular disease. The objective of this study was to identify the human liver cytochrome P450 (P450) enzyme(s) responsible for the metabolism of SCH 530348. Human liver microsomes metabolized SCH 530348 to M19, an amine metabolite formed via carbamate cleavage, and M20 (monohydroxy-SCH 530348). Recombinant human CYP3A4 exhibited the most activity (11.5% profiled radioactivity) for the formation of M19, followed by markedly less substrate conversion with CYP1A1 and CYP2C19. Trace levels of M19, a major excreted human metabolite, were detected with CYP1A2, CYP3A5, and CYP4F3A. Formation of M19 by human liver microsomes was inhibited 89% by ketoconazole (IC(50), 0.73 μM), 34% by tranylcypromine, and 89% by anti-CYP3A4 monoclonal antibody. There was a significant correlation between the rate of M19 formation and midazolam 1'-hydroxylation (r = 0.75) or M19 formation and testosterone 6β-hydroxylation (r = 0.92). The results of screening, inhibition, and correlation studies confirmed that CYP3A4 is the major P450 enzyme responsible for M19 formation from SCH 530348. In contrast, formation of M20, a major circulating human metabolite at steady state, was primarily catalyzed by CYP3A4 and CYP2J2. M20 is pharmacologically equipotent to SCH 530348, whereas M19 is an inactive metabolite. Formation of M20 by human liver microsomes was inhibited 89% by ketoconazole, 75% by astemizole (a CYP2J2 inhibitor), and 43% by CYP3A4 monoclonal antibody. These results suggest that CYP3A4 and CYP2J2 are both involved in the formation of M20 metabolite. DOI : 10.1124/dmd.110.035493
Inhibition of CYP2E1 (unknown origin) in baculosomes preincubated for 20 mins followed by addition of CYP enzyme-specific substrate and NADP+ and measured after 30 mins by fluorescence based analysis relative to control
—
Inhibition = 50.0 %
Reference
Title : A novel pipeline of 2-(benzenesulfonamide)-N-(4-hydroxyphenyl) acetamide analgesics that lack hepatotoxicity and retain antipyresis. Authors : Bazan HA,Bhattacharjee S,Burgos C,Recio J,Abet V,Pahng AR,Jun B,Heap J,Ledet AJ,Gordon WC,Edwards S,Paul D,Alvarez-Builla J,Bazan NG Publication Year :
2020 Journal : Eur J Med Chem Abstract : Although acetaminophen (ApAP) is one of the most commonly used medicines worldwide, hepatotoxicity is a risk with overdose or in patients with compromised liver function. ApAP overdose is the most common cause of acute fulminant hepatic failure. Oxidation of ApAP to N-acetyl-p-benzoquinone imine (NAPQI) is the mechanism for hepatotoxicity. 1 is a non-hepatotoxic, metabolically unstable lipophilic ApAP analog that is not antipyretic. The newly synthesized 3 is a non-hepatotoxic ApAP analog that is stable, lipophilic, and retains analgesia and antipyresis. Intraperitoneal or po administration of the new chemical entities (NCEs), 3b and 3r, in concentrations equal to a toxic dose of ApAP did not result in the formation of NAPQI. Unlike livers from NCE-treated mice, the livers from ApAP-treated mice demonstrated large amounts of nitrotyrosine, a marker of mitochondrial free radical formation, and loss of hepatic tight junction integrity. Given the widespread use of ApAP, hepatotoxicity risk with overuse, and the ongoing opioid epidemic, these NCEs represent a novel, non-narcotic therapeutic pipeline. DOI : 10.1016/j.ejmech.2020.112600
ALISKIREN
Inhibition of CYP2E1 in human liver microsomes from 10 healthy donors at 200 uM aliskiren (SPP100)
Liver
Inhibition = -12.8 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
EXEMESTANE
Drug metabolism assessed as human recombinant CYP2E1-mediated 17-hydroexemestane and 6-Hydroxymethylexemestane formation assessed as inhibition of metabolite formation at 10 uM after 10 mins by Michaelis-Menten saturation curve analysis in presence of 50 uM diethylthiocarbamate
—
Inhibition < 20.0 %
Reference
Title : In vitro cytochrome P450-mediated metabolism of exemestane. Authors : Kamdem LK, Flockhart DA, Desta Z. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Exemestane is a potent and irreversible steroidal aromatase inhibitor drug used for the treatment of estrogen receptor-positive breast cancer. Our aim was to identify and assess the contribution of the specific cytochromes P450 (P450s) responsible for exemestane primary in vitro metabolism. With the use of high-performance liquid chromatography and liquid chromatography-tandem mass spectrometry analytical techniques, 17-hydroexemestane (MI) formation and 6-hydroxymethylexemestane (MII) formation were found to be the predominant exemestane metabolic pathways. In a bank of 15 well characterized human liver microsomes with known P450 isoform-specific activities, the MI formation rate correlated significantly with CYP1A2 (Spearman r = 0.60, p = 0.02) and CYP4A11 (Spearman r = 0.67, p = 0.01) isoform-specific activities, whereas the MII production rate significantly correlated with CYP2B6 (Spearman r = 0.57, p = 0.03) and CYP3A (Spearman r = 0.76, p = 0.005) isoform-specific activities. Recombinant CYP1A1 metabolized exemestane to MI with a catalytic efficiency (Cl(int)) of 150 nl/pmol P450 × min that was at least 3.5-fold higher than those of other P450s investigated. Recombinant CYP3A4 catalyzed MII formation from exemestane with a catalytic efficiency of 840 nl/pmol P450 × min that was at least 4-fold higher than those of other P450s investigated. Among a panel of 10 chemical inhibitors tested, only ketoconazole and troleandomycin (CYP3A-specific chemical inhibitors) significantly inhibited the formation of MII by 45 and 95%, respectively. None of them markedly inhibited the formation of MI. In summary, exemestane seems to be metabolized to MI by multiple P450s that include CYP4A11 and CYP1A1/2, whereas its oxidation to MII is primarily mediated by CYP3A. DOI : 10.1124/dmd.110.032276
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ANIDULAFUNGIN
Inhibition of human CYP2C8 at 17.5 uM in presence of rosiglitazone
—
Inhibition = 34.3 %
Reference
Title : In vitro and in vivo studies to characterize the clearance mechanism and potential cytochrome P450 interactions of anidulafungin. Authors : Damle BD, Dowell JA, Walsky RL, Weber GL, Stogniew M, Inskeep PB. Publication Year :
2009 Journal : Antimicrob. Agents Chemother. Abstract : Anidulafungin is a novel semisynthetic echinocandin with potent activity against Candida (including azole-resistant isolates) and Aspergillus spp. and is used for serious systemic fungal infections. The purpose of these studies was to characterize the clearance mechanism and potential for drug interactions of anidulafungin. Experiments included in vitro degradation of anidulafungin in buffer and human plasma, a bioassay for antifungal activity, in vitro human cytochrome P450 inhibition studies, in vitro incubation with rat and human hepatocytes, and mass balance studies in rats and humans. Clearance of anidulafungin appeared to be primarily due to slow chemical degradation, with no evidence of hepatic-mediated metabolism (phase 1 or 2). Under physiological conditions, further degradation of the primary degradant appears to take place. The primary degradation product does not retain antifungal activity. Anidulafungin was not an inhibitor of cytochrome P450 enzymes commonly involved in drug metabolism. Mass balance studies showed that anidulafungin was eliminated in the feces predominantly as degradation products, with only a small fraction (10%) eliminated as unchanged drug; fecal elimination likely occurred via biliary excretion. Only negligible renal involvement in the drug's elimination was observed. In conclusion, the primary biotransformation of anidulafungin is mediated by slow chemical degradation, with no evidence for hepatic enzymatic metabolism or renal elimination. DOI : 10.1128/aac.01279-08
CARBAMAZEPINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CELECOXIB
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CLOTRIMAZOLE
Inhibition of CYP2C8 in human liver microsomes using paclitaxel as substrate after 8 mins by LC-MS/MS analysis
Liver
IC50 = 803.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
CLOZAPINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
COLCHICINE
Inhibition of CYP2C8 (unknown origin) at 3 uM
—
Inhibition = 20.4 %
Reference
Title : New cytotoxic benzosuberene analogs. Synthesis, molecular modeling and biological evaluation. Authors : Chen Z, Maderna A, Sukuru SC, Wagenaar M, O'Donnell CJ, Lam MH, Musto S, Loganzo F. Publication Year :
2013 Journal : Bioorg. Med. Chem. Lett. Abstract : In this Letter we describe the synthesis and biological evaluation of new benzosuberene analogs with structural modifications on the B-ring. The focus was initially to probe the chemical space around the B-ring C-8 position. This position was readily available for derivatization chemistry using our recently developed new synthesis for this compound class. Furthermore, we describe two new B-ring analogs, one containing a diene and the other a cyclic ether group. Both new analogs show excellent potencies in tumor cell proliferation assays. In addition, we describe molecular modeling studies that provide a binding rationale for reference compound 8 in the colchicine binding site using the known colchicine crystal structure. We also examine whether the cell based potency data obtained with selected new analogs are supported by modeling results. DOI : 10.1016/j.bmcl.2013.10.039
DICLOFENAC
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ERYTHROMYCIN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ETHINYL ESTRADIOL
Time dependent inhibition of CYP2C8 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FLUTAMIDE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FUROSEMIDE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
IMATINIB MESYLATE
Activity of CYP2C8 in human liver microsomes assessed as inhibition of montelukast-mediated N-desmethylimatinib formation at 0.1 uM after 5 mins by LC/MS analysis
Liver
Inhibition = 45.0 %
Reference
Title : Autoinhibition of CYP3A4 leads to important role of CYP2C8 in imatinib metabolism: variability in CYP2C8 activity may alter plasma concentrations and response. Authors : Filppula AM, Neuvonen M, Laitila J, Neuvonen PJ, Backman JT. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Recent data suggest that the role of CYP3A4 in imatinib metabolism is smaller than presumed. This study aimed to evaluate the quantitative importance of different cytochrome P450 (P450) enzymes in imatinib pharmacokinetics. First, the metabolism of imatinib was investigated using recombinant P450 enzymes and human liver microsomes with P450 isoform-selective inhibitors. Thereafter, an in silico model for imatinib was constructed to perform pharmacokinetic simulations to assess the roles of P450 enzymes in imatinib elimination at clinically used imatinib doses. In vitro, CYP2C8 inhibitors and CYP3A4 inhibitors inhibited the depletion of 0.1 µM imatinib by 45 and 80%, respectively, and the formation of the main metabolite of imatinib, N-desmethylimatinib, by >50%. Likewise, recombinant CYP2C8 and CYP3A4 metabolized imatinib extensively, whereas other isoforms had minor effect on imatinib concentrations. In the beginning of imatinib treatment, the fractions of its hepatic clearance mediated by CYP2C8 and CYP3A4 were predicted to approximate 40 and 60%, respectively. During long-term treatment with imatinib 400 mg once or twice daily, up to 65 or 75% of its hepatic elimination was predicted to occur via CYP2C8, and only about 35 or 25% by CYP3A4, due to dose- and time-dependent autoinactivation of CYP3A4 by imatinib. Thus, although CYP2C8 and CYP3A4 are the main enzymes in imatinib metabolism in vitro, in silico predictions indicate that imatinib inhibits its own CYP3A4-mediated metabolism, assigning a key role for CYP2C8. During multiple dosing, pharmacogenetic polymorphisms and drug interactions affecting CYP2C8 activity may cause marked interindividual variation in the exposure and response to imatinib. DOI : 10.1124/dmd.112.048017
IMATINIB MESYLATE
Activity of CYP2C8 in human liver microsomes assessed as inhibition of GEM-G-mediated N-desmethylimatinib formation at 0.1 uM after 5 mins by LC/MS analysis
Liver
Inhibition = 45.0 %
Reference
Title : Autoinhibition of CYP3A4 leads to important role of CYP2C8 in imatinib metabolism: variability in CYP2C8 activity may alter plasma concentrations and response. Authors : Filppula AM, Neuvonen M, Laitila J, Neuvonen PJ, Backman JT. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Recent data suggest that the role of CYP3A4 in imatinib metabolism is smaller than presumed. This study aimed to evaluate the quantitative importance of different cytochrome P450 (P450) enzymes in imatinib pharmacokinetics. First, the metabolism of imatinib was investigated using recombinant P450 enzymes and human liver microsomes with P450 isoform-selective inhibitors. Thereafter, an in silico model for imatinib was constructed to perform pharmacokinetic simulations to assess the roles of P450 enzymes in imatinib elimination at clinically used imatinib doses. In vitro, CYP2C8 inhibitors and CYP3A4 inhibitors inhibited the depletion of 0.1 µM imatinib by 45 and 80%, respectively, and the formation of the main metabolite of imatinib, N-desmethylimatinib, by >50%. Likewise, recombinant CYP2C8 and CYP3A4 metabolized imatinib extensively, whereas other isoforms had minor effect on imatinib concentrations. In the beginning of imatinib treatment, the fractions of its hepatic clearance mediated by CYP2C8 and CYP3A4 were predicted to approximate 40 and 60%, respectively. During long-term treatment with imatinib 400 mg once or twice daily, up to 65 or 75% of its hepatic elimination was predicted to occur via CYP2C8, and only about 35 or 25% by CYP3A4, due to dose- and time-dependent autoinactivation of CYP3A4 by imatinib. Thus, although CYP2C8 and CYP3A4 are the main enzymes in imatinib metabolism in vitro, in silico predictions indicate that imatinib inhibits its own CYP3A4-mediated metabolism, assigning a key role for CYP2C8. During multiple dosing, pharmacogenetic polymorphisms and drug interactions affecting CYP2C8 activity may cause marked interindividual variation in the exposure and response to imatinib. DOI : 10.1124/dmd.112.048017
LEVOFLOXACIN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
OLANZAPINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PACLITAXEL
Inhibition of human CYP2C8 at 10 uM
—
Inhibition = 80.89 %
Reference
Title : Novel Pyrrolopyridone Bromodomain and Extra-Terminal Motif (BET) Inhibitors Effective in Endocrine-Resistant ER+ Breast Cancer with Acquired Resistance to Fulvestrant and Palbociclib. Authors : Li Y, Zhao J, Gutgesell LM, Shen Z, Ratia K, Dye K, Dubrovskyi O, Zhao H, Huang F, Tonetti DA, Thatcher GRJ, Xiong R. Publication Year :
2020 Journal : J Med Chem Abstract : Acquired resistance to fulvestrant and palbociclib is a new challenge to treatment of estrogen receptor positive (ER+) breast cancer. ER is expressed in most resistance settings; thus, bromodomain and extra-terminal protein inhibitors (BETi) that target BET-amplified ER-mediated transcription have therapeutic potential. Novel pyrrolopyridone BETi leveraged novel interactions with L92/L94 confirmed by a cocrystal structure of 27 with BRD4. Optimization of BETi using growth inhibition in fulvestrant-resistant (MCF-7:CFR) cells was confirmed in endocrine-resistant, palbociclib-resistant, and ESR1 mutant cell lines. 27 was more potent in MCF-7:CFR cells than six BET inhibitors in clinical trials. Transcriptomic analysis differentiated 27 from the benchmark BETi, JQ-1, showing downregulation of oncogenes and upregulation of tumor suppressors and apoptosis. The therapeutic approach was validated by oral administration of 27 in orthotopic xenografts of endocrine-resistant breast cancer in monotherapy and in combination with fulvestrant. Importantly, at an equivalent dose in rats, thrombocytopenia was mitigated. DOI : 10.1021/acs.jmedchem.0c00456
PHENYTOIN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
RITONAVIR
Time dependent inhibition of CYP2C8 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
SULFAMETHOXAZOLE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VALPROIC ACID
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VALSARTAN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VORICONAZOLE
Inhibition of CYP2C8 in human liver microsomes assessed as amodiquine N-deethylation at 100 uM after 15 mins
Liver
Inhibition = 25.0 %
Reference
Title : Comprehensive in vitro analysis of voriconazole inhibition of eight cytochrome P450 (CYP) enzymes: major effect on CYPs 2B6, 2C9, 2C19, and 3A. Authors : Jeong S, Nguyen PD, Desta Z. Publication Year :
2009 Journal : Antimicrob. Agents Chemother. Abstract : Voriconazole is an effective antifungal drug, but adverse drug-drug interactions associated with its use are of major clinical concern. To identify the mechanisms of these interactions, we tested the inhibitory potency of voriconazole with eight human cytochrome P450 (CYP) enzymes. Isoform-specific probes were incubated with human liver microsomes (HLMs) (or expressed CYPs) and cofactors in the absence and the presence of voriconazole. Preincubation experiments were performed to test mechanism-based inactivation. In pilot experiments, voriconazole showed inhibition of CYP2B6, CYP2C9, CYP2C19, and CYP3A (half-maximal [50%] inhibitory concentrations, <6 microM); its effect on CYP1A2, CYP2A6, CYP2C8, and CYP2D6 was marginal (<25% inhibition at 100 microM voriconazole). Further detailed experiments with HLMs showed that voriconazole is a potent competitive inhibitor of CYP2B6 (K(i) < 0.5), CYP2C9 (K(i) = 2.79 microM), and CYP2C19 (K(i) = 5.1 microM). The inhibition of CYP3A by voriconazole was explained by noncompetitive (K(i) = 2.97 microM) and competitive (K(i) = 0.66 microM) modes of inhibition. Prediction of the in vivo interaction of voriconazole from these in vitro data suggests that voriconazole would substantially increase the exposure of drugs metabolized by CYP2B6, CYP2C9, CYP2C19, and CYP3A. Clinicians should be aware of these interactions and monitor patients for adverse effects or failure of therapy. DOI : 10.1128/aac.01123-08
ZAFIRLUKAST
Time dependent inhibition of CYP2C8 (unknown origin) at 3 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMIODARONE
Inhibition of CYP2C8-mediated paclitaxel metabolite formation in human liver microsomes at 5 uM after 8 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 32.7 %
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
AMLODIPINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMODIAQUINE
Time dependent inhibition of CYP2C8 (unknown origin) at 30 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ATORVASTATIN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BENZBROMARONE
Time dependent inhibition of CYP2C8 (unknown origin) at 3 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CAFFEINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CPI-1205
Inhibition of CYP2C8 (unknown origin) at 10 uM relative to control
—
Inhibition = 41.0 %
Reference
Title : Identification of (R)-N-((4-Methoxy-6-methyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-2-methyl-1-(1-(1-(2,2,2-trifluoroethyl)piperidin-4-yl)ethyl)-1H-indole-3-carboxamide (CPI-1205), a Potent and Selective Inhibitor of Histone Methyltransferase EZH2, Suitable for Phase I Clinical Trials for B-Cell Lymphomas. Authors : Vaswani RG,Gehling VS,Dakin LA,Cook AS,Nasveschuk CG,Duplessis M,Iyer P,Balasubramanian S,Zhao F,Good AC,Campbell R,Lee C,Cantone N,Cummings RT,Normant E,Bellon SF,Albrecht BK,Harmange JC,Trojer P,Audia JE,Zhang Y,Justin N,Chen S,Wilson JR,Gamblin SJ Publication Year :
2016 Journal : J Med Chem Abstract : Polycomb repressive complex 2 (PRC2) has been shown to play a major role in transcriptional silencing in part by installing methylation marks on lysine 27 of histone 3. Dysregulation of PRC2 function correlates with certain malignancies and poor prognosis. EZH2 is the catalytic engine of the PRC2 complex and thus represents a key candidate oncology target for pharmacological intervention. Here we report the optimization of our indole-based EZH2 inhibitor series that led to the identification of CPI-1205, a highly potent (biochemical IC = 0.002 μM, cellular EC = 0.032 μM) and selective inhibitor of EZH2. This compound demonstrates robust antitumor effects in a Karpas-422 xenograft model when dosed at 160 mg/kg BID and is currently in Phase I clinical trials. Additionally, we disclose the co-crystal structure of our inhibitor series bound to the human PRC2 complex. DOI : 10.1021/acs.jmedchem.6b01315
DONEPEZIL
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FLUOXETINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
OLMESARTAN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PF-05105679
Inhibition of CYP2C8 (unknown origin) at 3 uM
—
Inhibition = 0.0 %
Reference
Title : Discovery of a Selective TRPM8 Antagonist with Clinical Efficacy in Cold-Related Pain. Authors : Andrews MD, Af Forselles K, Beaumont K, Galan SR, Glossop PA, Grenie M, Jessiman A, Kenyon AS, Lunn G, Maw G, Owen RM, Pryde DC, Roberts D, Tran TD. Publication Year :
2015 Journal : ACS Med. Chem. Lett. Abstract : The transient receptor potential (TRP) family of ion channels comprises nonselective cation channels that respond to a wide range of chemical and thermal stimuli. TRPM8, a member of the melastatin subfamily, is activated by cold temperatures (<28 °C), and antagonists of this channel have the potential to treat cold induced allodynia and hyperalgesia. However, TRPM8 has also been implicated in mammalian thermoregulation and antagonists have the potential to induce hypothermia in patients. We report herein the identification and optimization of a series of TRPM8 antagonists that ultimately led to the discovery of PF-05105679. The clinical finding with this compound will be discussed, including both efficacy and its ability to affect thermoregulation processes in humans. DOI : 10.1021/ml500479v
PRAVASTATIN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROCAINAMIDE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROPRANOLOL
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
QUERCETIN
Inhibition of CYP2C8 in human liver microsomes at 10 uM incubated for 5 mins followed by NADPH addition by LC-MS/MS analysis relative to control
Liver
Inhibition = 95.0 %
Reference
Title : Potent and Selective Human Neuronal Nitric Oxide Synthase Inhibition by Optimization of the 2-Aminopyridine-Based Scaffold with a Pyridine Linker. Authors : Wang HY, Qin Y, Li H, Roman LJ, Martásek P, Poulos TL, Silverman RB. Publication Year :
2016 Journal : J. Med. Chem. Abstract : Neuronal nitric oxide synthase (nNOS) is an important therapeutic target for the treatment of various neurodegenerative disorders. A major challenge in the design of nNOS inhibitors focuses on potency in humans and selectivity over other NOS isoforms. Here we report potent and selective human nNOS inhibitors based on the 2-aminopyridine scaffold with a central pyridine linker. Compound 14j, the most promising inhibitor in this study, exhibits excellent potency for rat nNOS (Ki = 16 nM) with 828-fold n/e and 118-fold n/i selectivity with a Ki value of 13 nM against human nNOS with 1761-fold human n/e selectivity. Compound 14j also displayed good metabolic stability in human liver microsomes, low plasma protein binding, and minimal binding to cytochromes P450 (CYPs), although it had little to no Caco-2 permeability. DOI : 10.1021/acs.jmedchem.6b00273
RELACORILANT
Inhibition of CYP2C8 (unknown origin)
—
IC50 = 210.0 nM
Reference
Title : Identification of the Clinical Candidate (R)-(1-(4-Fluorophenyl)-6-((1-methyl-1H-pyrazol-4-yl)sulfonyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(4-(trifluoromethyl)pyridin-2-yl)methanone (CORT125134): A Selective Glucocorticoid Receptor (GR) Antagonist. Authors : Hunt HJ, Belanoff JK, Walters I, Gourdet B, Thomas J, Barton N, Unitt J, Phillips T, Swift D, Eaton E. Publication Year :
2017 Journal : J Med Chem Abstract : The nonselective glucocorticoid receptor (GR) antagonist mifepristone has been approved in the U.S. for the treatment of selected patients with Cushing's syndrome. While this drug is highly effective, lack of selectivity for GR leads to unwanted side effects in some patients. Optimization of the previously described fused azadecalin series of selective GR antagonists led to the identification of CORT125134, which is currently being evaluated in a phase 2 clinical study in patients with Cushing's syndrome. DOI : 10.1021/acs.jmedchem.7b00162
ROSIGLITAZONE
Time dependent inhibition of CYP2C8 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TAMOXIFEN
Time dependent inhibition of CYP2C8 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TICLOPIDINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VERAPAMIL
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
WARFARIN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
IMIPRAMINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CLOPIDOGREL
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PIOGLITAZONE
Time dependent inhibition of CYP2C8 (unknown origin) at 30 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ZOMEPIRAC
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BRILANESTRANT
Inhibition of CYP2C8 (unknown origin)
—
IC50 < 100.0 nM
Reference
Title : Identification of GDC-0810 (ARN-810), an Orally Bioavailable Selective Estrogen Receptor Degrader (SERD) that Demonstrates Robust Activity in Tamoxifen-Resistant Breast Cancer Xenografts. Authors : Lai A, Kahraman M, Govek S, Nagasawa J, Bonnefous C, Julien J, Douglas K, Sensintaffar J, Lu N, Lee KJ, Aparicio A, Kaufman J, Qian J, Shao G, Prudente R, Moon MJ, Joseph JD, Darimont B, Brigham D, Grillot K, Heyman R, Rix PJ, Hager JH, Smith ND. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Approximately 80% of breast cancers are estrogen receptor alpha (ER-α) positive, and although women typically initially respond well to antihormonal therapies such as tamoxifen and aromatase inhibitors, resistance often emerges. Although a variety of resistance mechanism may be at play in this state, there is evidence that in many cases the ER still plays a central role, including mutations in the ER leading to constitutively active receptor. Fulvestrant is a steroid-based, selective estrogen receptor degrader (SERD) that both antagonizes and degrades ER-α and is active in patients who have progressed on antihormonal agents. However, fulvestrant suffers from poor pharmaceutical properties and must be administered by intramuscular injections that limit the total amount of drug that can be administered and hence lead to the potential for incomplete receptor blockade. We describe the identification and characterization of a series of small-molecule, orally bioavailable SERDs which are potent antagonists and degraders of ER-α and in which the ER-α degrading properties were prospectively optimized. The lead compound 11l (GDC-0810 or ARN-810) demonstrates robust activity in models of tamoxifen-sensitive and tamoxifen-resistant breast cancer, and is currently in clinical trials in women with locally advanced or metastatic estrogen receptor-positive breast cancer. DOI : 10.1021/acs.jmedchem.5b00054
AMINOPYRINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ASTEMIZOLE
Inhibition of CYP2C8-mediated paclitaxel metabolite formation in human liver microsomes at 0.3 uM after 8 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 1.1 %
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
TACRINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TICRYNAFEN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
MAVELERTINIB
Inhibition of human CYP2C8 at 10 uM
—
Inhibition < 30.0 %
Reference
Title : Discovery of N-((3R,4R)-4-Fluoro-1-(6-((3-methoxy-1-methyl-1H-pyrazol-4-yl)amino)-9-methyl-9H-purin-2-yl)pyrrolidine-3-yl)acrylamide (PF-06747775) through Structure-Based Drug Design: A High Affinity Irreversible Inhibitor Targeting Oncogenic EGFR Mutants with Selectivity over Wild-Type EGFR. Authors : Planken S, Behenna DC, Nair SK, Johnson TO, Nagata A, Almaden C, Bailey S, Ballard TE, Bernier L, Cheng H, Cho-Schultz S, Dalvie D, Deal JG, Dinh DM, Edwards MP, Ferre RA, Gajiwala KS, Hemkens M, Kania RS, Kath JC, Matthews J, Murray BW, Niessen S, Orr ST, Pairish M, Sach NW, Shen H, Shi M, Solowiej J, Tran K, Tseng E, Vicini P, Wang Y, Weinrich SL, Zhou R, Zientek M, Liu L, Luo Y, Xin S, Zhang C, Lafontaine J. Publication Year :
2017 Journal : J Med Chem Abstract : Mutant epidermal growth factor receptor (EGFR) is a major driver of non-small-cell lung cancer (NSCLC). Marketed first generation inhibitors, such as erlotinib, effect a transient beneficial response in EGFR mutant NSCLC patients before resistance mechanisms render these inhibitors ineffective. Secondary oncogenic EGFR mutations account for approximately 50% of relapses, the most common being the gatekeeper T790M substitution that renders existing therapies ineffective. The discovery of PF-06459988 (1), an irreversible pyrrolopyrimidine inhibitor of EGFR T790M mutants, was recently disclosed.1 Herein, we describe our continued efforts to achieve potency across EGFR oncogenic mutations and improved kinome selectivity, resulting in the discovery of clinical candidate PF-06747775 (21), which provides potent EGFR activity against the four common mutants (exon 19 deletion (Del), L858R, and double mutants T790M/L858R and T790M/Del), selectivity over wild-type EGFR, and desirable ADME properties. Compound 21 is currently being evaluated in phase-I clinical trials of mutant EGFR driven NSCLC. DOI : 10.1021/acs.jmedchem.6b01894
AZD-3759
Inhibition of CYP2C8 (unknown origin)
—
IC50 > 50.0 nM
Reference
Title : Discovery and Evaluation of Clinical Candidate AZD3759, a Potent, Oral Active, Central Nervous System-Penetrant, Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitor. Authors : Zeng Q, Wang J, Cheng Z, Chen K, Johnström P, Varnäs K, Li DY, Yang ZF, Zhang X. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Recent reports suggest that an increasing number of patients with lung cancer, especially those with activating mutations of the epidermal growth factor receptor (EGFR), also present with brain metastases and leptomeningeal metastases. These patients have poor prognosis as there are no approved drugs for these indications. Available agents have poor efficacy for these patients even at well above their standard dose. Herein, we report the discovery of (4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl (2R)-2,4-dimethylpiperazine-1-carboxylate 1m (AZD3759), an investigational drug currently in Phase 1 clinical trial, which has excellent central nervous system penetration and which induces profound regression of brain metastases in a mouse model. DOI : 10.1021/acs.jmedchem.5b01073
INDOMETHACIN
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition = 14.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
EXEMESTANE
Drug metabolism assessed as human recombinant CYP2C8-mediated 17-hydroexemestane and 6-Hydroxymethylexemestane formation assessed as inhibition of metabolite formation at 10 uM after 10 mins by Michaelis-Menten saturation curve analysis in presence of 20 uM quercetin
—
Inhibition < 20.0 %
Reference
Title : In vitro cytochrome P450-mediated metabolism of exemestane. Authors : Kamdem LK, Flockhart DA, Desta Z. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Exemestane is a potent and irreversible steroidal aromatase inhibitor drug used for the treatment of estrogen receptor-positive breast cancer. Our aim was to identify and assess the contribution of the specific cytochromes P450 (P450s) responsible for exemestane primary in vitro metabolism. With the use of high-performance liquid chromatography and liquid chromatography-tandem mass spectrometry analytical techniques, 17-hydroexemestane (MI) formation and 6-hydroxymethylexemestane (MII) formation were found to be the predominant exemestane metabolic pathways. In a bank of 15 well characterized human liver microsomes with known P450 isoform-specific activities, the MI formation rate correlated significantly with CYP1A2 (Spearman r = 0.60, p = 0.02) and CYP4A11 (Spearman r = 0.67, p = 0.01) isoform-specific activities, whereas the MII production rate significantly correlated with CYP2B6 (Spearman r = 0.57, p = 0.03) and CYP3A (Spearman r = 0.76, p = 0.005) isoform-specific activities. Recombinant CYP1A1 metabolized exemestane to MI with a catalytic efficiency (Cl(int)) of 150 nl/pmol P450 × min that was at least 3.5-fold higher than those of other P450s investigated. Recombinant CYP3A4 catalyzed MII formation from exemestane with a catalytic efficiency of 840 nl/pmol P450 × min that was at least 4-fold higher than those of other P450s investigated. Among a panel of 10 chemical inhibitors tested, only ketoconazole and troleandomycin (CYP3A-specific chemical inhibitors) significantly inhibited the formation of MII by 45 and 95%, respectively. None of them markedly inhibited the formation of MI. In summary, exemestane seems to be metabolized to MI by multiple P450s that include CYP4A11 and CYP1A1/2, whereas its oxidation to MII is primarily mediated by CYP3A. DOI : 10.1124/dmd.110.032276
NEVIRAPINE
Time dependent inhibition of CYP2C8 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ZIMLOVISERTIB
Inhibition of CYP2C8 in human liver microsomes at 3 uM
Liver
Inhibition < 5.0 %
Reference
Title : Discovery of Clinical Candidate 1-{[(2S,3S,4S)-3-Ethyl-4-fluoro-5-oxopyrrolidin-2-yl]methoxy}-7-methoxyisoquinoline-6-carboxamide (PF-06650833), a Potent, Selective Inhibitor of Interleukin-1 Receptor Associated Kinase 4 (IRAK4), by Fragment-Based Drug Design. Authors : Lee KL, Ambler CM, Anderson DR, Boscoe BP, Bree AG, Brodfuehrer JI, Chang JS, Choi C, Chung S, Curran KJ, Day JE, Dehnhardt CM, Dower K, Drozda SE, Frisbie RK, Gavrin LK, Goldberg JA, Han S, Hegen M, Hepworth D, Hope HR, Kamtekar S, Kilty IC, Lee A, Lin LL, Lovering FE, Lowe MD, Mathias JP, Morgan HM, Murphy EA, Papaioannou N, Patny A, Pierce BS, Rao VR, Saiah E, Samardjiev IJ, Samas BM, Shen MWH, Shin JH, Soutter HH, Strohbach JW, Symanowicz PT, Thomason JR, Trzupek JD, Vargas R, Vincent F, Yan J, Zapf CW, Wright SW. Publication Year :
2017 Journal : J Med Chem Abstract : Through fragment-based drug design focused on engaging the active site of IRAK4 and leveraging three-dimensional topology in a ligand-efficient manner, a micromolar hit identified from a screen of a Pfizer fragment library was optimized to afford IRAK4 inhibitors with nanomolar potency in cellular assays. The medicinal chemistry effort featured the judicious placement of lipophilicity, informed by co-crystal structures with IRAK4 and optimization of ADME properties to deliver clinical candidate PF-06650833 (compound 40). This compound displays a 5-unit increase in lipophilic efficiency from the fragment hit, excellent kinase selectivity, and pharmacokinetic properties suitable for oral administration. DOI : 10.1021/acs.jmedchem.7b00231
EMAVUSERTIB
Inhibition of CYP2C8 (unknown origin) at 1 uM relative to control
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CARBAMAZEPINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CELECOXIB
Time dependent inhibition of CYP2C9 (unknown origin) at 30 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CLOTRIMAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate after 8 mins by LC-MS/MS analysis
Liver
IC50 = 136.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
CLOZAPINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
COLCHICINE
Inhibition of CYP2C9 (unknown origin) at 3 uM
—
Inhibition = 11.1 %
Reference
Title : New cytotoxic benzosuberene analogs. Synthesis, molecular modeling and biological evaluation. Authors : Chen Z, Maderna A, Sukuru SC, Wagenaar M, O'Donnell CJ, Lam MH, Musto S, Loganzo F. Publication Year :
2013 Journal : Bioorg. Med. Chem. Lett. Abstract : In this Letter we describe the synthesis and biological evaluation of new benzosuberene analogs with structural modifications on the B-ring. The focus was initially to probe the chemical space around the B-ring C-8 position. This position was readily available for derivatization chemistry using our recently developed new synthesis for this compound class. Furthermore, we describe two new B-ring analogs, one containing a diene and the other a cyclic ether group. Both new analogs show excellent potencies in tumor cell proliferation assays. In addition, we describe molecular modeling studies that provide a binding rationale for reference compound 8 in the colchicine binding site using the known colchicine crystal structure. We also examine whether the cell based potency data obtained with selected new analogs are supported by modeling results. DOI : 10.1016/j.bmcl.2013.10.039
DICLOFENAC
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DOLUTEGRAVIR
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate at 100 uM preincubated for 20 mins with substrate prior to initiation of reaction with NADPH by HPLC analysis
Liver
Inhibition = 20.0 %
Reference
Title : In vitro investigations into the roles of drug transporters and metabolizing enzymes in the disposition and drug interactions of dolutegravir, a HIV integrase inhibitor. Authors : Reese MJ, Savina PM, Generaux GT, Tracey H, Humphreys JE, Kanaoka E, Webster LO, Harmon KA, Clarke JD, Polli JW. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Dolutegravir (DTG; S/GSK1349572) is a potent HIV-1 integrase inhibitor with a distinct resistance profile and a once-daily dose regimen that does not require pharmacokinetic boosting. This work investigated the in vitro drug transport and metabolism of DTG and assessed the potential for clinical drug-drug interactions. DTG is a substrate for the efflux transporters P-glycoprotein (Pgp) and human breast cancer resistance protein (BCRP). Its high intrinsic membrane permeability limits the impact these transporters have on DTG's intestinal absorption. UDP-glucuronosyltransferase (UGT) 1A1 is the main enzyme responsible for the metabolism of DTG in vivo, with cytochrome P450 (P450) 3A4 being a notable pathway and UGT1A3 and UGT1A9 being only minor pathways. DTG demonstrated little or no inhibition (IC(50) values > 30 μM) in vitro of the transporters Pgp, BCRP, multidrug resistance protein 2, organic anion transporting polypeptide 1B1/3, organic cation transporter (OCT) 1, or the drug metabolizing enzymes CYP1A2, 2A6, 2B6, 2C8, 2C9, 2C19, 2D6, 3A4, UGT1A1, or 2B7. Further, DTG did not induce CYP1A2, 2B6, or 3A4 mRNA in vitro using human hepatocytes. DTG does inhibit the renal OCT2 (IC(50) = 1.9 μM) transporter, which provides a mechanistic basis for the mild increases in serum creatinine observed in clinical studies. These in vitro studies demonstrate a low propensity for DTG to be a perpetrator of clinical drug interactions and provide a basis for predicting when other drugs could result in a drug interaction with DTG. DOI : 10.1124/dmd.112.048918
ERYTHROMYCIN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ETHINYL ESTRADIOL
Time dependent inhibition of CYP2C9 (unknown origin) at 30 uM by LC/MS system
—
Inhibition = 27.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FLUCONAZOLE
Inhibition of CYP2C9 (unknown origin) at 120 uM by luminescent readout-based method
—
Inhibition = 89.09 %
Reference
Title : Phenoxymethyl 1,3-oxazoles and 1,2,4-oxadiazoles as potent and selective agonists of free fatty acid receptor 1 (GPR40). Authors : Zahanich I, Kondratov I, Naumchyk V, Kheylik Y, Platonov M, Zozulya S, Krasavin M. Publication Year :
2015 Journal : Bioorg. Med. Chem. Lett. Abstract : A screening hit that showed a weak (EC50 = 18 μM), partial agonistic effect on GPR40 was used a prototype for expedited hit expansion effort using a set of advanced building blocks. The latter yielded several 1,3-oxazoles and 1,2,4-oxadiazoles with significantly improved potency (best EC50 = 0.058 μM). The lead compounds in each chemotype showed a very good ADME profile (aqueous solubility, plasma protein binding, microsomal stability and membrane permeability) and no appreciable inhibition of key cytochromes P450. The compounds reported are significant new starting points for further preclinical development of future diabetic agents with a mechanism of action for which a first-in-class agent is yet to be approved. DOI : 10.1016/j.bmcl.2015.06.018
FLUCONAZOLE
Inhibition of CYP2C9 (unknown origin) at 120 uM by P450-glo assay
—
Inhibition = 89.09 %
Reference
Title : Novel free fatty acid receptor 1 (GPR40) agonists based on 1,3,4-thiadiazole-2-carboxamide scaffold. Authors : Krasavin M, Lukin A, Zhurilo N, Kovalenko A, Zahanich I, Zozulya S, Moore D, Tikhonova IG. Publication Year :
2016 Journal : Bioorg. Med. Chem. Abstract : Free fatty acid receptor 1 (FFA1), previously known as GPR40 is a G protein-coupled receptor and a new target for treatment of type 2 diabetes. Two series of FFA1 agonists utilizing a 1,3,4-thiadiazole-2-caboxamide scaffold were synthetized. Both series offered significant improvement of the potency compared to the previously described 1,3,4-thiadiazole-based FFA1 agonists and high selectivity for FFA1. Molecular docking predicts new aromatic interactions with the receptor that improve agonist potency. The most potent compounds from both series were profiled for in vitro ADME properties (plasma and metabolic stability, LogD, plasma protein binding, hERG binding and CYP inhibition). One series suffered very rapid degradation in plasma and in presence of mouse liver microsomes. However, the other series delivered a lead compound that displayed a reasonable ADME profile together with the improved FFA1 potency. DOI : 10.1016/j.bmc.2016.04.065
FLUTAMIDE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FUROSEMIDE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
KETOCONAZOLE
Inhibition of CYP2C9 in human liver microsomes assessed as tolbutamide hydroxylation to hydroxytolbutamide at 1 uM after 10 mins relative to control
Liver
Inhibition = 22.0 %
Reference
Title : Rational development of 4-aminopyridyl-based inhibitors targeting Trypanosoma cruzi CYP51 as anti-chagas agents. Authors : Choi JY, Calvet CM, Gunatilleke SS, Ruiz C, Cameron MD, McKerrow JH, Podust LM, Roush WR. Publication Year :
2013 Journal : J. Med. Chem. Abstract : A new series of 4-aminopyridyl-based lead inhibitors targeting Trypanosoma cruzi CYP51 (TcCYP51) has been developed using structure-based drug design as well as structure-property relationship (SPR) analyses. The screening hit starting point, LP10 (KD ≤ 42 nM; EC50 = 0.65 μM), has been optimized to give the potential leads 14t, 27i, 27q, 27r, and 27t, which have low-nanomolar binding affinity to TcCYP51 and significant activity against T. cruzi amastigotes cultured in human myoblasts (EC50 = 14-18 nM for 27i and 27r). Many of the optimized compounds have improved microsome stability, and most are selective against human CYPs 1A2, 2D6, and 3A4 (<50% inhibition at 1 μM). A rationale for the improvement in microsome stability and selectivity of inhibitors against human metabolic CYP enzymes is presented. In addition, the binding mode of 14t with the Trypanosoma brucei CYP51 (TbCYP51) orthologue has been characterized by X-ray structure analysis. DOI : 10.1021/jm401067s
LEVOFLOXACIN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
MILTEFOSINE
Inhibition of human microsomal CYP2C9 expressed in baculovirus infected insect cells at 10 uM using luciferin-H as substrate preincubated with enzyme/substrate mixture for 30 mins followed by further incubation with NADPH for 30 mins by CYP450 luciferase Glo assay relative to control
—
Inhibition = -0.8 %
Reference
Title : Discovery of a benzothiophene-flavonol halting miltefosine and antimonial drug resistance in Leishmania parasites through the application of medicinal chemistry, screening and genomics. Authors : Borsari C, Jiménez-Antón MD, Eick J, Bifeld E, Torrado JJ, Olías-Molero AI, Corral MJ, Santarem N, Baptista C, Severi L, Gul S, Wolf M, Kuzikov M, Ellinger B, Reinshagen J, Witt G, Linciano P, Tait A, Costantino L, Luciani R, Tejera Nevado P, Zander-Dinse D, Franco CH, Ferrari S, Moraes CB, Cordeiro-da-Silva A, Ponterini G, Clos J, Alunda JM, Costi MP. Publication Year :
2019 Journal : Eur J Med Chem Abstract : Leishmaniasis, a major health problem worldwide, has a limited arsenal of drugs for its control. The appearance of resistance to first- and second-line anti-leishmanial drugs confirms the need to develop new and less toxic drugs that overcome spontaneous resistance. In the present study, we report the design and synthesis of a novel library of 38 flavonol-like compounds and their evaluation in a panel of assays encompassing parasite killing, pharmacokinetics, genomics and ADME-Toxicity resulting in the progression of a compound in the drug discovery value chain. Compound 19, 2-(benzo[b]thiophen-3-yl)-3-hydroxy-6-methoxy-4H-chromen-4-one, exhibited a broad-spectrum activity against Leishmania spp. (EC50 1.9 μM for Leishmania infantum, 3.4 μM for L. donovani, 6.7 μM for L. major), Trypanosoma cruzi (EC50 7.5 μM) and T. brucei (EC50 0.8 μM). Focusing on anti-Leishmania activity, compound 19 challenge in vitro did not select for resistance markers in L. donovani, while a Cos-Seq screening for dominant resistance genes identified a gene locus on chromosome 36 that became ineffective at concentrations beyond EC50. Thus, compound 19 is a promising scaffold to tackle drug resistance in Leishmania infection. In vivo pharmacokinetic studies indicated that compound 19 has a long half-life (intravenous (IV): 63.2 h; per os (PO): 46.9 h) with an acceptable ADME-Toxicity profile. When tested in Leishmania infected hamsters, no toxicity and limited efficacy were observed. Low solubility and degradation were investigated spectroscopically as possible causes for the sub-optimal pharmacokinetic properties. Compound 19 resulted a specific compound based on the screening against a protein set, following the intrinsic fluorescence changes. DOI : 10.1016/j.ejmech.2019.111676
OLANZAPINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PHENYTOIN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
RILPIVIRINE
Inhibition of CYP2C9 in human liver microsomes using diclofenac substrate incubated for 10 mins in presence of NADPH
Liver
IC50 = 346.0 nM
Reference
Title : Structure-Based Bioisosterism Yields HIV-1 NNRTIs with Improved Drug-Resistance Profiles and Favorable Pharmacokinetic Properties. Authors : Kang D, Feng D, Sun Y, Fang Z, Wei F, De Clercq E, Pannecouque C, Liu X, Zhan P. Publication Year :
2020 Journal : J Med Chem Abstract : The development of efficacious NNRTIs for AIDS therapy commonly encountered the rapid generation of drug-resistant mutations, which becomes a major impediment to effective anti-HIV treatment. Using a structure-based bioisosterism strategy, a series of piperidine-substituted thiophene[2,3-d]pyrimidine derivatives were designed and synthesized. Compound 9a yielded the greatest potency, exhibiting significantly better anti-HIV-1 activity than ETR against all of the tested NNRTI-resistant HIV-1 strains. In addition, the phenotypic (cross)resistance of 9a and other NRTIs to the different selected HIV-1 strains was evaluated. As expected, no phenotypic cross-resistance against the NRTIs (AZT and PMPA) was observed with the mutant 9ares strain. Furthermore, 9a was identified with improved solubility, lower CYP liability, and hERG inhibition. Remarkably, 9a exhibited optimal pharmacokinetic properties in rats (F = 37.06%) and safety in mice (LD50 > 2000 mg/kg), which highlights 9a as a promising anti-HIV-1 drug candidate. DOI : 10.1021/acs.jmedchem.0c00117
RILPIVIRINE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate in presence of NADPH incubated for 10 mins by LC-MS/MS analysis
Liver
IC50 = 346.0 nM
Reference
Title : Authors : Publication Year : Journal :
RILPIVIRINE
Inhibition of human CYP2C9 using tolbutamide as substrate in presence of NADPH incubated for 15 to 45 mins
—
IC50 = 346.0 nM
Reference
Title : Authors : Publication Year : Journal :
RITONAVIR
Time dependent inhibition of CYP2C9 (unknown origin) at 3 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
SULFADIAZINE
Inhibition of human CYP2C9 assessed as (S)-Flurbiprofen hydroxylation
—
Inhibition = -17.1 %
Reference
Title : Use of simple docking methods to screen a virtual library for heteroactivators of cytochrome P450 2C9. Authors : Locuson CW, Gannett PM, Ayscue R, Tracy TS. Publication Year :
2007 Journal : J. Med. Chem. Abstract : Several laboratories have demonstrated that activation of drug metabolism by P450s may occur via a mechanism that resembles allosterism from an enzyme kinetic standpoint. Because the effector drug binding site may be located in the same P450 binding pocket where the drug substrate is located, the ability to find and characterize novel effectors (aka heteroactivators) will prove to be important in probing the mechanism of activation. We have used analogues of the prototypical CYP2C9 heteroactivator dapsone to validate a simple docking method that can be used to predict heteroactivators based on ligand binding location in a P450 crystal structure. As proof of concept for the described docking method, a protocol was developed to discover potential heteroactivators from a virtual chemical library through efficient sorting of >40,000 compounds. One of the top-scoring compounds identified was verified to be a CYP2C9 heteroactivator in vitro, and it possessed activity similar to dapsone. DOI : 10.1021/jm060706p
SULFAMETHOXAZOLE
Inhibition of human CYP2C9 assessed as (S)-Flurbiprofen hydroxylation
—
Inhibition = -17.1 %
Reference
Title : Use of simple docking methods to screen a virtual library for heteroactivators of cytochrome P450 2C9. Authors : Locuson CW, Gannett PM, Ayscue R, Tracy TS. Publication Year :
2007 Journal : J. Med. Chem. Abstract : Several laboratories have demonstrated that activation of drug metabolism by P450s may occur via a mechanism that resembles allosterism from an enzyme kinetic standpoint. Because the effector drug binding site may be located in the same P450 binding pocket where the drug substrate is located, the ability to find and characterize novel effectors (aka heteroactivators) will prove to be important in probing the mechanism of activation. We have used analogues of the prototypical CYP2C9 heteroactivator dapsone to validate a simple docking method that can be used to predict heteroactivators based on ligand binding location in a P450 crystal structure. As proof of concept for the described docking method, a protocol was developed to discover potential heteroactivators from a virtual chemical library through efficient sorting of >40,000 compounds. One of the top-scoring compounds identified was verified to be a CYP2C9 heteroactivator in vitro, and it possessed activity similar to dapsone. DOI : 10.1021/jm060706p
SULFAMETHOXAZOLE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
SULFANILAMIDE
Inhibition of human CYP2C9 assessed as (S)-Flurbiprofen hydroxylation
—
Inhibition = -17.8 %
Reference
Title : Use of simple docking methods to screen a virtual library for heteroactivators of cytochrome P450 2C9. Authors : Locuson CW, Gannett PM, Ayscue R, Tracy TS. Publication Year :
2007 Journal : J. Med. Chem. Abstract : Several laboratories have demonstrated that activation of drug metabolism by P450s may occur via a mechanism that resembles allosterism from an enzyme kinetic standpoint. Because the effector drug binding site may be located in the same P450 binding pocket where the drug substrate is located, the ability to find and characterize novel effectors (aka heteroactivators) will prove to be important in probing the mechanism of activation. We have used analogues of the prototypical CYP2C9 heteroactivator dapsone to validate a simple docking method that can be used to predict heteroactivators based on ligand binding location in a P450 crystal structure. As proof of concept for the described docking method, a protocol was developed to discover potential heteroactivators from a virtual chemical library through efficient sorting of >40,000 compounds. One of the top-scoring compounds identified was verified to be a CYP2C9 heteroactivator in vitro, and it possessed activity similar to dapsone. DOI : 10.1021/jm060706p
SULFAPHENAZOLE
Inhibition of human CYP2C9 at 10 uM
—
Inhibition > 90.0 %
Reference
Title : Synthesis and evaluation of non-dimeric HCV NS5A inhibitors. Authors : Amblard F, Zhang H, Zhou L, Shi J, Bobeck DR, Nettles JH, Chavre S, McBrayer TR, Tharnish P, Whitaker T, Coats SJ, Schinazi RF. Publication Year :
2013 Journal : Bioorg. Med. Chem. Lett. Abstract : Based on the symmetrical bidentate structure of the NS5A inhibitor BMS-790052, a series of new monodentate molecules were designed. The synthesis of 36 new non-dimeric NS5A inhibitors is reported along with their ability to block HCV replication in an HCV 1b replicon system. Among them compound 5a showed picomolar range activity along with an excellent selectivity index (SI > 90,000). DOI : 10.1016/j.bmcl.2013.02.023
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using (S)-warfarin as substrate after 30 mins
Liver
Inhibition = 67.0 %
Reference
Title : Semisynthesis, cytotoxicity, antiviral activity, and drug interaction liability of 7-O-methylated analogues of flavonolignans from milk thistle. Authors : Althagafy HS, Graf TN, Sy-Cordero AA, Gufford BT, Paine MF, Wagoner J, Polyak SJ, Croatt MP, Oberlies NH. Publication Year :
2013 Journal : Bioorg. Med. Chem. Abstract : Silymarin, an extract of the seeds of milk thistle (Silybum marianum), is used as an herbal remedy, particularly for hepatoprotection. The main chemical constituents in silymarin are seven flavonolignans. Recent studies explored the non-selective methylation of one flavonolignan, silybin B, and then tested those analogues for cytotoxicity and inhibition of both cytochrome P450 (CYP) 2C9 activity in human liver microsomes and hepatitis C virus infection in a human hepatoma (Huh7.5.1) cell line. In general, enhanced bioactivity was observed with the analogues. To further probe the biological consequences of methylation of the seven major flavonolignans, a series of 7-O-methylflavonolignans were generated. Optimization of the reaction conditions permitted selective methylation at the phenol in the 7-position in the presence of each metabolite's 4-5 other phenolic and/or alcoholic positions without the use of protecting groups. These 7-O-methylated analogues, in parallel with the corresponding parent compounds, were evaluated for cytotoxicity against Huh7.5.1 cells; in all cases the monomethylated analogues were more cytotoxic than the parent compounds. Moreover, parent compounds that were relatively non-toxic and inactive or weak inhibitors of hepatitis C virus infection had enhanced cytotoxicity and anti-HCV activity upon 7-O-methylation. Also, the compounds were tested for inhibition of major drug metabolizing enzymes (CYP2C9, CYP3A4/5, UDP-glucuronsyltransferases) in pooled human liver or intestinal microsomes. Methylation of flavonolignans differentially modified inhibitory potency, with compounds demonstrating both increased and decreased potency depending upon the compound tested and the enzyme system investigated. In total, these data indicated that monomethylation modulates the cytotoxic, antiviral, and drug interaction potential of silymarin flavonolignans. DOI : 10.1016/j.bmc.2013.04.017
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes assessed as tolbutamide hydroxylation to hydroxytolbutamide at 10 uM after 10 mins relative to control
Liver
Inhibition = 92.0 %
Reference
Title : Rational development of 4-aminopyridyl-based inhibitors targeting Trypanosoma cruzi CYP51 as anti-chagas agents. Authors : Choi JY, Calvet CM, Gunatilleke SS, Ruiz C, Cameron MD, McKerrow JH, Podust LM, Roush WR. Publication Year :
2013 Journal : J. Med. Chem. Abstract : A new series of 4-aminopyridyl-based lead inhibitors targeting Trypanosoma cruzi CYP51 (TcCYP51) has been developed using structure-based drug design as well as structure-property relationship (SPR) analyses. The screening hit starting point, LP10 (KD ≤ 42 nM; EC50 = 0.65 μM), has been optimized to give the potential leads 14t, 27i, 27q, 27r, and 27t, which have low-nanomolar binding affinity to TcCYP51 and significant activity against T. cruzi amastigotes cultured in human myoblasts (EC50 = 14-18 nM for 27i and 27r). Many of the optimized compounds have improved microsome stability, and most are selective against human CYPs 1A2, 2D6, and 3A4 (<50% inhibition at 1 μM). A rationale for the improvement in microsome stability and selectivity of inhibitors against human metabolic CYP enzymes is presented. In addition, the binding mode of 14t with the Trypanosoma brucei CYP51 (TbCYP51) orthologue has been characterized by X-ray structure analysis. DOI : 10.1021/jm401067s
SULFAPHENAZOLE
Inhibition of CYP2C9 (unknown origin) at 10 uM relative to control
—
Inhibition = 75.79 %
Reference
Title : Potent Hepatitis C Virus NS5A Inhibitors Containing a Benzidine Core. Authors : Bae IH, Choi JK, Chough C, Keum SJ, Kim H, Jang SK, Kim BM. Publication Year :
2014 Journal : ACS Med. Chem. Lett. Abstract : Here we report the discovery of a series of potent hepatitis C virus (HCV) NS5A inhibitors based on the benzidine prolinamide backbone. Taking a simple synthetic route, we developed a novel inhibitor structure, which allows easy modification, and through optimization of the capping group, we identified compound 6 with highly potent anti-HCV activity. Compound 6 is nontoxic and is anticipated to be an effective HCV drug candidate. DOI : 10.1021/ml4003293
SULFAPHENAZOLE
Inhibition of human CYP2C9 at 10 uM
—
Inhibition = 96.0 %
Reference
Title : Development of (E)-2-((1,4-dimethylpiperazin-2-ylidene)amino)-5-nitro-N-phenylbenzamide, ML336: Novel 2-amidinophenylbenzamides as potent inhibitors of venezuelan equine encephalitis virus. Authors : Schroeder CE, Yao T, Sotsky J, Smith RA, Roy S, Chu YK, Guo H, Tower NA, Noah JW, McKellip S, Sosa M, Rasmussen L, Smith LH, White EL, Aubé J, Jonsson CB, Chung D, Golden JE. Publication Year :
2014 Journal : J. Med. Chem. Abstract : Venezuelan equine encephalitis virus (VEEV) is an emerging pathogenic alphavirus that can cause significant disease in humans. Given the absence of therapeutic options available and the significance of VEEV as a weaponized agent, an optimization effort was initiated around a quinazolinone screening hit 1 with promising cellular antiviral activity (EC50 = 0.8 μM), limited cytotoxic liability (CC50 > 50 μM), and modest in vitro efficacy in reducing viral progeny (63-fold at 5 μM). Scaffold optimization revealed a novel rearrangement affording amidines, specifically compound 45, which was found to potently inhibit several VEEV strains in the low nanomolar range without cytotoxicity (EC50 = 0.02-0.04 μM, CC50 > 50 μM) while limiting in vitro viral replication (EC90 = 0.17 μM). Brain exposure was observed in mice with 45. Significant protection was observed in VEEV-infected mice at 5 mg kg(-1) day(-1) and viral replication appeared to be inhibited through interference of viral nonstructural proteins. DOI : 10.1021/jm501203v
SULFAPHENAZOLE
Inhibition of recombinant human CYP2C9 preincubated at 10 uM for 5 mins before fluorescent substrate addition by fluorescence assay
—
Inhibition = 11.3 %
Reference
Title : Synthesis and biological evaluation of 3-phenethylazetidine derivatives as triple reuptake inhibitors. Authors : Yun J, Han M, Song C, Cheon SH, Choi K, Hahn HG. Publication Year :
2014 Journal : Bioorg. Med. Chem. Lett. Abstract : We report the synthesis of 3-phenethylazetidine derivatives 2 and their biological activities against 5-HT, NE and DA transporters as well as microsomal stability, CYP inhibition, and hERG inhibition profiles. Compound 2at showed most potent triple reuptake inhibitor with good selectivity as a candidate for depression. DOI : 10.1016/j.bmcl.2014.06.026
SULFAPHENAZOLE
Inhibitory activity of 3 uM sulfaphenazole on 56 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 83.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
SULFAPHENAZOLE
Inhibitory activity of 3 uM sulfaphenazole on 59 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 82.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
SULFAPHENAZOLE
Inhibitory activity of 3 uM sulfaphenazole on 80 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 75.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
SULFAPHENAZOLE
Inhibition of human CYP2C9 at 10 uM preincubated for 10 mins with cofactor followed by mixture of enzyme-substrate addition by fluorescence assay relative to control
—
Inhibition = 93.7 %
Reference
Title : Osthol and curcumin as inhibitors of human Pgp and multidrug efflux pumps of Staphylococcus aureus: reversing the resistance against frontline antibacterial drugs Authors : Joshi P, Singh S, Wani A, Sharma S, Jain SK, Singh B, Gupta BD, Satti NK, Koul S, Khan IA, Kumar A, Bharate SB, Vishwakarma RA Publication Year :
2014 Journal : MedChemComm DOI : 10.1039/C4MD00196F
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate at 10 uM preincubated for 5 mins followed by NADPH addition measured after 10 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 98.0 %
Reference
Title : Potent and Selective Human Neuronal Nitric Oxide Synthase Inhibition by Optimization of the 2-Aminopyridine-Based Scaffold with a Pyridine Linker. Authors : Wang HY, Qin Y, Li H, Roman LJ, Martásek P, Poulos TL, Silverman RB. Publication Year :
2016 Journal : J. Med. Chem. Abstract : Neuronal nitric oxide synthase (nNOS) is an important therapeutic target for the treatment of various neurodegenerative disorders. A major challenge in the design of nNOS inhibitors focuses on potency in humans and selectivity over other NOS isoforms. Here we report potent and selective human nNOS inhibitors based on the 2-aminopyridine scaffold with a central pyridine linker. Compound 14j, the most promising inhibitor in this study, exhibits excellent potency for rat nNOS (Ki = 16 nM) with 828-fold n/e and 118-fold n/i selectivity with a Ki value of 13 nM against human nNOS with 1761-fold human n/e selectivity. Compound 14j also displayed good metabolic stability in human liver microsomes, low plasma protein binding, and minimal binding to cytochromes P450 (CYPs), although it had little to no Caco-2 permeability. DOI : 10.1021/acs.jmedchem.6b00273
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes at 5 uM using diclofenac sodium as substrate by LC-MS/MS analysis relative to control
Liver
Inhibition = 94.9 %
Reference
Title : Design, synthesis and biological evaluation of a series of novel GPR40 agonists containing nitrogen heterocyclic rings. Authors : Sun Z, Zhou T, Pan X, Yang Y, Huan Y, Xiao Z, Shen Z, Liu Z. Publication Year :
2018 Journal : Bioorg Med Chem Lett Abstract : A novel series of GPR40 agonists is designed by introducing nitrogen-containing heterocyclic ring at the terminal phenyl ring of TAK-875 with the aim of decreasing its lipophilicity. Three different β-substituted phenylpropionic acids were investigated as the acidic components. A total of 34 compounds have been synthesized, among which, compound 30 exhibited comparable GPR40 agonistic activity in vitro with TAK-875 and relatively lower lipophilicity through calculation (30, EC50 = 1.2 μM, cLogP = 1.3; TAK-875: EC50 = 5.1 μM, cLogP = 3.4). Moreover, compound 30 was able to enhance the insulin secretion of primary islets isolated from normal ICR mice and showed no obvious inhibition against cytochromes P450 in vitro. In vivo, compound 30 exhibited efficacy in oral glucose tolerance test (oGTT) in normal ICR mice. DOI : 10.1016/j.bmcl.2018.07.048
SULFAPHENAZOLE
Inhibition of recombinant human CYP2C9 expressed in insect cell microsomes at 10 uM using Luciferin-H as substrate preincubated for 30 mins followed by NADPH addition measured after 30 mins by luminometric method
—
Inhibition = 98.0 %
Reference
Title : Hedgehog pathway inhibitors of the acylthiourea and acylguanidine class show antitumor activity on colon cancer in vitro and in vivo. Authors : Vesci L, Milazzo FM, Stasi MA, Pace S, Manera F, Tallarico C, Cini E, Petricci E, Manetti F, De Santis R, Giannini G. Publication Year :
2018 Journal : Eur J Med Chem Abstract : Small series of acylguanidine and acylthiourea derivatives were synthesized in gram-scale and assayed for their ability to modulate the Hh signalling pathway. In vitro studies showed a low micromolar inhibitory activity toward tumor cell lines, while the oral administration revealed an excellent ADME profile in vivo. Compound 5 emerged as the most active and safe inhibitor of colon cancer cells both in vitro and in a xenograft mouse model. Based on these data, 5 could be prioritized to further development with the perspective of clinical studies. DOI : 10.1016/j.ejmech.2018.07.053
SULFAPHENAZOLE
Inhibition of human CYP2C9 in human liver microsomes at 50 times IC50 concentration relative to control
Liver
Inhibition = 96.5 %
Reference
Title : Synthesis and Biological Investigation of Phenothiazine-Based Benzhydroxamic Acids as Selective Histone Deacetylase 6 Inhibitors. Authors : Vögerl K, Ong N, Senger J, Herp D, Schmidtkunz K, Marek M, Müller M, Bartel K, Shaik TB, Porter NJ, Robaa D, Christianson DW, Romier C, Sippl W, Jung M, Bracher F. Publication Year :
2019 Journal : J Med Chem Abstract : The phenothiazine system was identified as a favorable cap group for potent and selective histone deacetylase 6 (HDAC6) inhibitors. Here, we report the preparation and systematic variation of phenothiazines and their analogues containing a benzhydroxamic acid moiety as the zinc-binding group. We evaluated their ability to selectively inhibit HDAC6 by a recombinant HDAC enzyme assay, by determining the protein acetylation levels in cells by western blotting (tubulin vs histone acetylation), and by assessing their effects on various cancer cell lines. Structure-activity relationship studies revealed that incorporation of a nitrogen atom into the phenothiazine framework results in increased potency and selectivity for HDAC6 (more than 500-fold selectivity relative to the inhibition of HDAC1, HDAC4, and HDAC8), as rationalized by molecular modeling and docking studies. The binding mode was confirmed by co-crystallization of the potent azaphenothiazine inhibitor with catalytic domain 2 from Danio rerio HDAC6. DOI : 10.1021/acs.jmedchem.8b01090
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes at 10 uM using diclofenac as substrate preincubated for 5 mins followed by NADPH addition and measured after 20 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 82.0 %
Reference
Title : Novel Tetrahydropyrido[4,3-d]pyrimidines as Potent Inhibitors of Chaperone Heat Shock Protein 90. Authors : Jiang F,Wang HJ,Jin YH,Zhang Q,Wang ZH,Jia JM,Liu F,Wang L,Bao QC,Li DD,You QD,Xu XL Publication Year :
2016 Journal : J Med Chem Abstract : Heat shock protein 90 (Hsp90) is a potential target for oncology therapeutics. Some inhibitors have shown antitumor effects in clinical trials, spurring the discovery of small molecule Hsp90 inhibitors. Here, we describe the structural optimization studies of a hit compound, tetrahydropyrido[4,3-d]pyrimidine-based Hsp90 inhibitor 15, which exhibits inhibitory activity against Hsp90. A series of analogues were synthesized, and their structure-activity and structure-property relationships were analyzed. These explorations led to the discovery of compound 73, which exhibited potent in vitro activities, good physicochemical properties, favorable ADME properties, and a potent antitumor effect in an HCT116 xenograft model. Furthermore, 73 exhibited no ocular toxicity in a rat retinal damage model, suggesting it is a relatively safe Hsp90 inhibitor. As a promising antitumor agent, 73 was progressed for further preclinical evaluation. DOI : 10.1021/acs.jmedchem.6b00912
SULFAPHENAZOLE
Inhibition of CYP2C9 (unknown origin) at 0.5 uM relative to control
—
Inhibition = 48.3 %
Reference
Title : The optimization and characterization of functionalized sulfonamides derived from sulfaphenazole against Mycobacterium tuberculosis with reduced CYP 2C9 inhibition. Authors : Chen H,Wang B,Li P,Yan H,Li G,Huang H,Lu Y Publication Year :
2021 Journal : Bioorg Med Chem Lett Abstract : In this study, a series of sulfonamide compounds was designed and synthesized through the systematic optimization of the antibacterial agent sulfaphenazole for the treatment of Mycobacterium tuberculosis (M. tuberculosis). Preliminary results indicate that the 4-aminobenzenesulfonamide moiety plays a key role in maintaining antimycobacterial activity. Compounds 10c, 10d, 10f and 10i through the optimization on phenyl ring at the R site on the pyrazole displayed promising antimycobacterial activity paired with low cytotoxicity. In particular, compound 10d displayed good activity (MIC = 5.69 μg/mL) with low inhibition of CYP 2C9 (IC > 10 μM), consequently low potential risk of drug-drug interaction. These promising results provide new insight into the combination regimen using sulfonamide as one component for the treatment of M. tuberculosis. DOI : 10.1016/j.bmcl.2021.127924
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver Microsome using diclofenac as substrate preincubated for 10 mins followed by NADPH addition and further incubated for 10 mins as substrate by LC-MS/MS analysis relative to control
Liver
Inhibition = 84.5 %
Reference
Title : Authors : Publication Year : Journal :
SULFAPHENAZOLE
Inhibition of CYP2C9 (unknown origin) at 1 uM using diclofenac as substrate relative to control
—
Inhibition = 79.9 %
Reference
Title : Authors : Publication Year : Journal :
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes
Liver
IC50 = 350.0 nM
Reference
Title : Identification and characterization of 4-methylbenzyl 4-[(pyrimidin-2-ylamino)methyl]piperidine-1-carboxylate, an orally bioavailable, brain penetrant NR2B selective N-methyl-D-aspartate receptor antagonist. Authors : Liverton NJ, Bednar RA, Bednar B, Butcher JW, Claiborne CF, Claremon DA, Cunningham M, DiLella AG, Gaul SL, Libby BE, Lyle EA, Lynch JJ, McCauley JA, Mosser SD, Nguyen KT, Stump GL, Sun H, Wang H, Yergey J, Koblan KS. Publication Year :
2007 Journal : J. Med. Chem. Abstract : The discovery of a novel series of NR2B subtype selective N-methyl-d-aspartate (NMDA) antagonists is reported. Initial optimization of a high-throughput screening lead afforded an aminopyridine derivative 13 with significant NR2B antagonist potency but limited selectivity over hERG-channel and other off-target activities. Further structure-activity studies on the aminoheterocycle moiety and optimization of the carbamate led to the highly potent 2-aminopyrimidine derivative 20j with a significantly improved off-target activity profile and oral bioavailability in multiple species coupled with good brain penetration. Compound 20j demonstrated efficacy in in vivo rodent models of antinociception, allodynia, and Parkinson's disease. DOI : 10.1021/jm060983w
SULFAPHENAZOLE
Inhibition of human CYP2C9
—
IC50 = 250.0 nM
Reference
Title : Design, synthesis, and biological evaluation of (hydroxyphenyl)naphthalene and -quinoline derivatives: potent and selective nonsteroidal inhibitors of 17beta-hydroxysteroid dehydrogenase type 1 (17beta-HSD1) for the treatment of estrogen-dependent diseases. Authors : Frotscher M, Ziegler E, Marchais-Oberwinkler S, Kruchten P, Neugebauer A, Fetzer L, Scherer C, Müller-Vieira U, Messinger J, Thole H, Hartmann RW. Publication Year :
2008 Journal : J. Med. Chem. Abstract : Human 17beta-hydroxysteroid dehydrogenase type 1 (17beta-HSD1) catalyzes the reduction of the weak estrogen estrone (E1) to the highly potent estradiol (E2). This reaction takes place in the target cell where the estrogenic effect is exerted via the estrogen receptor (ER). Estrogens, especially E2, are known to stimulate the proliferation of hormone-dependent diseases. 17beta-HSD1 is overexpressed in many breast tumors. Thus, it is an attractive target for the treatment of these diseases. Ligand- and structure-based drug design led to the discovery of novel, selective, and potent inhibitors of 17beta-HSD1. Phenyl-substituted bicyclic moieties were synthesized as mimics of the steroidal substrate. Computational methods were used to obtain insight into their interactions with the protein. Compound 5 turned out to be a highly potent inhibitor of 17beta-HSD1 showing good selectivity (17beta-HSD2, ERalpha and beta), medium cell permeation, reasonable metabolic stability (rat hepatic microsomes), and little inhibition of hepatic CYP enzymes. DOI : 10.1021/jm701447v
SULFAPHENAZOLE
Inhibition of human recombinant CYP2C9 expressed in insect microsomes
—
IC50 = 318.0 nM
Reference
Title : Overcoming undesirable CYP1A2 inhibition of pyridylnaphthalene-type aldosterone synthase inhibitors: influence of heteroaryl derivatization on potency and selectivity. Authors : Heim R, Lucas S, Grombein CM, Ries C, Schewe KE, Negri M, Müller-Vieira U, Birk B, Hartmann RW. Publication Year :
2008 Journal : J. Med. Chem. Abstract : Recently, we reported on the development of potent and selective inhibitors of aldosterone synthase (CYP11B2) for the treatment of congestive heart failure and myocardial fibrosis. A major drawback of these nonsteroidal compounds was a strong inhibition of the hepatic drug-metabolizing enzyme CYP1A2. In the present study, we examined the influence of substituents in the heterocycle of lead structures with a naphthalene molecular scaffold to overcome this unwanted side effect. With respect to CYP11B2 inhibition, some substituents induced a dramatic increase in inhibitory potency. The methoxyalkyl derivatives 22 and 26 are the most potent CYP11B2 inhibitors up to now (IC50 = 0.2 nM). Most compounds also clearly discriminated between CYP11B2 and CYP11B1, and the CYP1A2 potency significantly decreased in some cases (e.g., isoquinoline derivative 30 displayed only 6% CYP1A2 inhibition at 2 microM concentration). Furthermore, isoquinoline derivative 28 proved to be capable of passing the gastrointestinal tract and reached the general circulation after peroral administration to male Wistar rats. DOI : 10.1021/jm800377h
SULFAPHENAZOLE
Inhibition of human recombinant CYP2C9 expressed in baculovirus-infected insect microsomes
—
IC50 = 318.0 nM
Reference
Title : Novel aldosterone synthase inhibitors with extended carbocyclic skeleton by a combined ligand-based and structure-based drug design approach. Authors : Lucas S, Heim R, Negri M, Antes I, Ries C, Schewe KE, Bisi A, Gobbi S, Hartmann RW. Publication Year :
2008 Journal : J. Med. Chem. Abstract : Pharmacophore modeling of a series of aldosterone synthase (CYP11B2) inhibitors triggered the design of compounds 11 and 12 by extending a previously established naphthalene molecular scaffold (e.g., present in molecules 1 and 2) via introduction of a phenyl or benzyl residue in 3-position. These additional aromatic moieties have been hypothesized to fit into the newly identified hydrophobic pharmacophore feature HY3. Subsequent docking studies in our refined CYP11B2 protein model have been performed prior to synthesis to estimate the inhibitory properties of the proposed molecules. While phenyl-substituted compound 11 (IC50 > 500 nM) did not dock under the given pharmacophore constraint (i.e., the Fe(heme)-N(ligand) interaction), benzyl-substituted compound 12 (IC50 = 154 nM) was found to exploit a previously unexplored subpocket of the inhibitor binding site. By structural optimization based on the pharmacophore hypothesis, 25 novel compounds were synthesized, among them highly potent CYP11B2 inhibitors (e.g., 17, IC50 = 2.7 nM) with pronounced selectivity toward the most important steroidogenic and hepatic CYP enzymes. DOI : 10.1021/jm800683c
SULFAPHENAZOLE
Inhibition of human CYP2C9
—
IC50 = 250.0 nM
Reference
Title : New drug-like hydroxyphenylnaphthol steroidomimetics as potent and selective 17β-hydroxysteroid dehydrogenase type 1 inhibitors for the treatment of estrogen-dependent diseases. Authors : Marchais-Oberwinkler S, Wetzel M, Ziegler E, Kruchten P, Werth R, Henn C, Hartmann RW, Frotscher M. Publication Year :
2011 Journal : J. Med. Chem. Abstract : Inhibition of 17β-hydroxysteroid dehydrogenase type 1 (17β-HSD1) is a novel and attractive approach to reduce the local levels of the active estrogen 17β-estradiol in patients with estrogen-dependent diseases like breast cancer or endometriosis. With the aim of optimizing the biological profile of 17β-HSD1 inhibitors from the hydroxyphenylnaphthol class, structural optimizations were performed at the 1-position of the naphthalene by introduction of different heteroaromatic rings as well as substituted phenyl groups. In the latter class of compounds, which were synthesized applying Suzuki-cross coupling, the 3-methanesulfonamide 15 turned out to be a highly potent 17β-HSD1 inhibitor (IC(50) = 15 nM in a cell-free assay). It was also very active in the cellular assay (T47D cells, IC(50) = 71 nM) and selective toward 17β-HSD2 and the estrogen receptors α and β. It showed a good membrane permeation and metabolic stability and was orally available in the rat. DOI : 10.1021/jm1009082
SULFAPHENAZOLE
Inhibition of human CYP2C9 expressed in baculovirus-infected insect microsomes
—
IC50 = 318.0 nM
Reference
Title : Fine-tuning the selectivity of aldosterone synthase inhibitors: structure-activity and structure-selectivity insights from studies of heteroaryl substituted 1,2,5,6-tetrahydropyrrolo[3,2,1-ij]quinolin-4-one derivatives. Authors : Lucas S, Negri M, Heim R, Zimmer C, Hartmann RW. Publication Year :
2011 Journal : J. Med. Chem. Abstract : Pyridine substituted 3,4-dihydro-1H-quinolin-2-ones (e.g., 1-3) constitute a class of highly potent and selective inhibitors of aldosterone synthase (CYP11B2), a promising target for the treatment of hyperaldosteronism, congestive heart failure, and myocardial fibrosis. Among these, ethyl-substituted 3 possesses high selectivity against CYP1A2. Rigidification of 3 by incorporation of the ethyl group into a 5- or 6-membered ring affords compounds with a pyrroloquinolinone or pyridoquinolinone molecular scaffold (e.g., 4 and 5). It was found that these molecules are even more potent and selective CYP11B2 inhibitors than their corresponding open-chain analogues. Moreover, pyrroloquinolinone 4 exhibits no inhibition of the six most important hepatic CYP enzymes as well as a bioavailability in the range of the marketed drug fadrozole. The SAR studies disclose that subtle changes in the heterocyclic moiety are responsible for either a strong or a weak inhibition of the highly homologous 11β-hydroxylase (CYP11B1). These results are not only important for fine-tuning the selectivity of CYP11B2 inhibitors but also for the development of selective CYP11B1 inhibitors that are of interest for the treatment of Cushing's syndrome and metabolic syndrome. DOI : 10.1021/jm101470k
SULFAPHENAZOLE
Inhibition of recombinant CYP2C9 (unknown origin) using 7-methoxy-4-trifluoromethylcoumarin as substrate
—
IC50 = 180.0 nM
Reference
Title : Investigation of a novel series of 2-hydroxyisoquinoline-1,3(2H,4H)-diones as human immunodeficiency virus type 1 integrase inhibitors. Authors : Suchaud V, Bailly F, Lion C, Calmels C, Andréola ML, Christ F, Debyser Z, Cotelle P. Publication Year :
2014 Journal : J. Med. Chem. Abstract : We report herein further insight into the biological activities displayed by a series of 2-hydroxyisoquinoline-1,3(2H,4H)-diones (HIDs). Substitution of the N-hydroxyimide two-metal binding pharmacophore at position 4 by carboxamido side chains was previously shown by us to be fruitful for this scaffold, since strong human immunodeficiency virus type 1 integrase (HIV-1 IN) inhibitors in the low nanomolar range associated with low micromolar anti-HIV activities were obtained. We investigated the influence of substitution at position 7 on biological activity. Introduction of electron-withdrawing functional groups such as the nitro moiety at position 7 led to a noticeable improvement of antiviral activity, down to low nanomolar anti-HIV potencies, with advantageous therapeutic indexes going close to those of the clinically used raltegravir and retained potencies against a panel of IN mutants. DOI : 10.1021/jm500109z
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsome
Liver
IC50 = 180.0 nM
Reference
Title : Discovery of novel pyrimidine and malonamide derivatives as TGR5 agonists. Authors : Park EJ, Ahn YG, Jung SH, Bang HJ, Kim M, Hong DJ, Kim J, Suh KH, Kim YJ, Kim D, Kim EY, Lee K, Min KH. Publication Year :
2014 Journal : Bioorg. Med. Chem. Lett. Abstract : Takeda G-protein-coupled receptor 5 (TGR5) is a promising molecular target for metabolic diseases. A series of 4-(2,5-dichlorophenoxy)pyrimidine and cyclopropylmalonamide derivatives were synthesized as potent agonists of TGR5 based on a bioisosteric replacement strategy. Several compounds exhibited improved potency, compared to a reference compound with a pyridine scaffold. The pharmacokinetic profile of the representative compound 18 was considered moderate. DOI : 10.1016/j.bmcl.2014.07.026
SULFAPHENAZOLE
Inhibition of CYP2C9 (unknown origin) using luciferin tagged substrate preincubated for 10 mins before substrate addition
—
IC50 = 80.0 nM
Reference
Title : Discovery of potent and selective cytotoxic activity of new quinazoline-ureas against TMZ-resistant glioblastoma multiforme (GBM). Authors : Elkamhawy A, Viswanath AN, Pae AN, Kim HY, Heo JC, Park WK, Lee CO, Yang H, Kim KH, Nam DH, Seol HJ, Cho H, Roh EJ. Publication Year :
2015 Journal : Eur. J. Med. Chem. Abstract : Herein, we report new quinazoline-urea based compounds with potent cytotoxic activities against TMZ-resistant glioblastoma multiforme (GBM) cells. Low micromolar IC₅₀ values were exhibited over a panel of three primary GBM patient-derived cell cultures belonging to proneural (GBM-1), mesenchymal (GBM-2), and classical (GBM-3) subtypes. Eight compounds showed excellent selectivity indices for GBM cells comparing to a normal astrocyte cell line. In JC-1 assay, analogues 11, 12, 20, 22, and 24 exerted promising rates of mPTP opening induction towards proneural GBM subtype. Compounds 11, 20, and 24 bound to the translocator protein 18 kDa (TSPO) in submicromolar range using [(3)H] PK-11195 binding affinity assay. A homology model was built and docked models of 11, 12, 20, 22 and 24 were generated for describing their plausible binding modes in TSPO. In 3D clonogenic assay, compound 20 manifested potent tumoricidal effects on TMZ-resistant GBM cells even at submicromolar concentrations. In addition, CYP450 and hERG assays presented a safe toxicity profile of 20. Taken as a whole, this report presents compound 20 as a potent, selective and safe GBM cytotoxic agent which constitutes a promising direction against TMZ-resistant GBM. DOI : 10.1016/j.ejmech.2015.08.001
SULFAPHENAZOLE
Inhibition of human recombinant CYP2C9 using MFC as substrate incubated for 40 mins by fluorimetry
—
IC50 = 180.0 nM
Reference
Title : 2-hydroxyisoquinoline-1,3(2H,4H)-diones (HIDs) as human immunodeficiency virus type 1 integrase inhibitors: Influence of the alkylcarboxamide substitution of position 4. Authors : Billamboz M, Suchaud V, Bailly F, Lion C, Andréola ML, Christ F, Debyser Z, Cotelle P. Publication Year :
2016 Journal : Eur. J. Med. Chem. Abstract : Herein, we report further insight into the biological activities displayed by the 2-hydroxyisoquinoline-1,3(2H,4H)-dione (HID) scaffold. Previous studies have evidenced the marked fruitful effect of substitution of this two-metal binding pharmacophore at position 4 by phenyl and benzyl carboxamido chains. Strong human immunodeficiency virus type 1 integrase (HIV-1 IN) inhibitors in the low nanomolar range with micromolar (even down to low nanomolar) anti-HIV activities were obtained. Keeping this essential 4-carboxamido function, we investigated the influence of the replacement of phenyl and benzyl groups by various alkyl chains. This study shows that the recurrent halogenobenzyl pharmacophore found in the INSTIs can be efficiently replaced by an n-alkyl group. With an optimal length of six carbons, we observed a biological profile and a high barrier to resistance equivalent to those of a previously reported hit compound bearing a 4-fluorobenzyl group. DOI : 10.1016/j.ejmech.2016.03.083
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using tolbutamide as substrate after 20 mins by LC-MS analysis
Liver
IC50 = 740.0 nM
Reference
Title : Understanding Oxadiazolothiazinone Biological Properties: Negative Inotropic Activity versus Cytochrome P450-Mediated Metabolism. Authors : Carosati E, Cosimelli B, Ioan P, Severi E, Katneni K, Chiu FC, Saponara S, Fusi F, Frosini M, Matucci R, Micucci M, Chiarini A, Spinelli D, Budriesi R. Publication Year :
2016 Journal : J. Med. Chem. Abstract : We present a series of oxadiazolothiazinones, selective inotropic agents on isolated cardiac tissues, devoid of chronotropy and vasorelaxant activity. Functional and binding data for the precursor of the series (compound 1) let us hypothesize LTCC blocking activity and the existence of a recognition site specific for this scaffold. We synthesized and tested 22 new derivatives: introducing a para-methoxyphenyl at C-8 led to compound 12 (EC50 = 0.022 μM), twice as potent as its para-bromo analogue (1). For 10 analogues, we extended the characterization of the biological properties by including the assessment of metabolic stability in human liver microsomes and cytochrome P450 inhibition potential. We observed that the methoxy group led to active compounds with low metabolic stability and high CYP inhibition, whereas the protective effect of bromine resulted in enhanced metabolic stability and reduced CYP inhibition. Thus, we identified two para-bromo benzothiazino-analogues as candidates for further studies. DOI : 10.1021/acs.jmedchem.6b00030
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver using microsomes diclofenac as substrate preincubated for 10 mins followed by NADPH addition measured after 10 mins by LC/MS/MS method
Liver
IC50 = 704.0 nM
Reference
Title : Discovery of biphenyl imidazole derivatives as potent antifungal agents: Design, synthesis, and structure-activity relationship studies. Authors : Zhao D, Zhao S, Zhao L, Zhang X, Wei P, Liu C, Hao C, Sun B, Su X, Cheng M. Publication Year :
2017 Journal : Bioorg Med Chem Abstract : Fungal infections have became a serious medical problem due to their high incidence and mortality. We describe the discovery and structure-activity relationships studies (SARs) of a series of novel biphenyl imidazole derivatives with excellent antifungal activities against Candida albicans and Cryptococcus neoformans. The most promising compounds 12f-g and 19a-b exhibited excellent activity with minimum inhibitory concentration (MIC) values in the range of 0.03125-2μg/mL. Preliminary mechanism studies showed that the potent antifungal activity of compound 12g stemed from inhibition of CYP51 in Candida albicans. Furthermore, compounds 12g and 19b exhibited low inhibition profiles for various human cytochrome P450 isoforms. The SARs and binding mode established in this study will be useful for further lead optimization. DOI : 10.1016/j.bmc.2016.11.051
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using tolbutamide as substrate after 5 to 15 mins
Liver
IC50 = 205.0 nM
Reference
Title : Discovery of GBT440, an Orally Bioavailable R-State Stabilizer of Sickle Cell Hemoglobin. Authors : Metcalf B, Chuang C, Dufu K, Patel MP, Silva-Garcia A, Johnson C, Lu Q, Partridge JR, Patskovska L, Patskovsky Y, Almo SC, Jacobson MP, Hua L, Xu Q, Gwaltney SL, Yee C, Harris J, Morgan BP, James J, Xu D, Hutchaleelaha A, Paulvannan K, Oksenberg D, Li Z. Publication Year :
2017 Journal : ACS Med Chem Lett Abstract : We report the discovery of a new potent allosteric effector of sickle cell hemoglobin, GBT440 (36), that increases the affinity of hemoglobin for oxygen and consequently inhibits its polymerization when subjected to hypoxic conditions. Unlike earlier allosteric activators that bind covalently to hemoglobin in a 2:1 stoichiometry, 36 binds with a 1:1 stoichiometry. Compound 36 is orally bioavailable and partitions highly and favorably into the red blood cell with a RBC/plasma ratio of ∼150. This partitioning onto the target protein is anticipated to allow therapeutic concentrations to be achieved in the red blood cell at low plasma concentrations. GBT440 (36) is in Phase 3 clinical trials for the treatment of sickle cell disease (NCT03036813). DOI : 10.1021/acsmedchemlett.6b00491
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate preincubated for 10 mins followed by NADPH addition measured after 10 mins by LC/MS/MS analysis
Liver
IC50 = 535.0 nM
Reference
Title : Design, synthesis and evaluation of aromatic heterocyclic derivatives as potent antifungal agents. Authors : Zhao S, Zhang X, Wei P, Su X, Zhao L, Wu M, Hao C, Liu C, Zhao D, Cheng M. Publication Year :
2017 Journal : Eur J Med Chem Abstract : To further enhance the anti-Aspergillus efficacy of our previously discovered antifungal lead compounds (1), a series of aromatic heterocyclic derivatives were designed, synthesized and evaluated for in vitro antifungal activity. Many of the target compounds showed good inhibitory activity against Candida albicans and Cryptococcus neoformans. In particular, the isoxazole nuclei were more suited for improving the activity against Aspergillus spp. Among these compounds, 2-F substituted analogues 23g and 23h displayed the most remarkable in vitro activity against Candida spp., C. neoformans, A. fumigatus and fluconazole-resistant C.alb. strains, which is superior or comparable to the activity of the reference drugs fluconazole and voriconazole. Notably, the compounds 23g and 23h exhibited low inhibition profiles for various isoforms of human cytochrome P450 and excellent blood plasma stability. DOI : 10.1016/j.ejmech.2017.05.043
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes assessed as tolbutamide methylhydroxylation after 4 to 40 mins in presence of NADPH by LCMS analysis
Liver
IC50 = 720.0 nM
Reference
Title : Synthesis and profiling of benzylmorpholine 1,2,4,5-tetraoxane analogue N205: Towards tetraoxane scaffolds with potential for single dose cure of malaria. Authors : O' Neill PM, Stocks PA, Sabbani S, Roberts NL, Amewu RK, Shore ER, Aljayyoussi G, Angulo-Barturén I, Belén M, Jiménez-Díaz, Bazaga SF, Martínez MS, Campo B, Sharma R, Charman SA, Ryan E, Chen G, Shackleford DM, Davies J, Nixon GL, Biagini GA, Ward SA. Publication Year :
2018 Journal : Bioorg Med Chem Abstract : A series of aryl carboxamide and benzylamino dispiro 1,2,4,5-tetraoxane analogues have been designed and synthesized in a short synthetic sequence from readily available starting materials. From this series of endoperoxides, molecules with in vitro IC50s versus Plasmodium falciparum (3D7) as low as 0.84 nM were identified. Based on an assessment of blood stability and in vitro microsomal stability, N205 (10a) was selected for rodent pharmacokinetic and in vivo antimalarial efficacy studies in the mouse Plasmodium berghei and Plasmodium falciparum Pf3D70087/N9 severe combined immunodeficiency (SCID) mouse models. The results indicate that the 4-benzylamino derivatives have excellent profiles with a representative of this series, N205, an excellent starting point for further lead optimization studies. DOI : 10.1016/j.bmc.2018.05.006
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate preincubated for 10 mins followed by NADPH addition measured after 10 mins by LC-MS/MS analysis
Liver
IC50 = 462.0 nM
Reference
Title : Design, synthesis and evaluation of benzoheterocycle analogues as potent antifungal agents targeting CYP51. Authors : Zhao S, Wei P, Wu M, Zhang X, Zhao L, Jiang X, Hao C, Su X, Zhao D, Cheng M. Publication Year :
2018 Journal : Bioorg Med Chem Abstract : To further enhance the anti-Aspergillus efficacy of our previously discovered antifungal lead compound 1, a series of benzoheterocycle analogues were designed, synthesized and evaluated for their in vitro antifungal activity. The most promising compounds 13s and 14a exhibited excellent antifungal activity against C. albicans, C. neoformans, A. fumigatus and fluconazole-resistant C. albicans strains, that was superior or comparable to those of the reference drugs fluconazole and voriconazole. GC-MS analyses suggested that the novel compound 13s might have a similar mechanism to fluconazole by inhibiting fungal lanosterol 14α-demethylase (CYP51). Furthermore, compounds 13s and 14a exhibited low inhibition profiles for various human cytochrome P450 isoforms as well as excellent blood plasma stability. DOI : 10.1016/j.bmc.2018.04.054
SULFAPHENAZOLE
Inhibition of CYP2C9 in pooled human liver microsomes pre-incubated for 5 mins before NADPH addition and measured after 10 mins by UPLC-MS/MS analysis relative to control
Liver
IC50 = 685.0 nM
Reference
Title : Discovery and Characterization of Potent Pan-Genotypic HCV NS5A Inhibitors Containing Novel Tricyclic Central Core Leading to Clinical Candidate. Authors : Ramdas V, Talwar R, Banerjee M, Joshi AA, Das AK, Walke DS, Borhade P, Dhayagude U, Loriya R, Gote G, Bommakanti A, Sivaram A, Agarwal G, Goswami A, Nigade P, Mehta M, Patil V, Modi D, Kumar H, Mallurwar S, Dash A, Modi F, Kuldharan S, Srivastava P, Singh M, Narasimham L, Gundu J, Sharma S, Kamboj RK, Palle VP. Publication Year :
2019 Journal : J Med Chem Abstract : The identification of a novel class of potent pan-genotypic NS5A inhibitors with good pharmacokinetic profile suitable for potential use in treating HCV infections is disclosed here. The present series of compounds are with less complex tricyclic central core, identified through a systematic SAR study carried out on biphenyl moiety. The SAR outcome has confirmed the requirement of near planar and linear conformation of the molecule to achieve the best pan-genotypic activity. In addition, SAR with substituted imidazoles on improvement of antiviral activity is disclosed. The newly identified compounds 12, 16, 19-21 have shown desirable pharmacokinetic profiles with a favorable uptake of compounds in liver and maintained a significant concentration for up to 8 h in the liver. In addition, compounds 20 and 21 have shown superior pan-genotypic anti-HCV activity compared to ledipasvir and daclatasvir. Additional characterization and preliminary safety assessment resulted in the identification of compound 20 as a potential clinical candidate. DOI : 10.1021/acs.jmedchem.9b01562
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac substrate incubated for 10 mins in presence of NADPH
Liver
IC50 = 660.0 nM
Reference
Title : Structure-Based Bioisosterism Yields HIV-1 NNRTIs with Improved Drug-Resistance Profiles and Favorable Pharmacokinetic Properties. Authors : Kang D, Feng D, Sun Y, Fang Z, Wei F, De Clercq E, Pannecouque C, Liu X, Zhan P. Publication Year :
2020 Journal : J Med Chem Abstract : The development of efficacious NNRTIs for AIDS therapy commonly encountered the rapid generation of drug-resistant mutations, which becomes a major impediment to effective anti-HIV treatment. Using a structure-based bioisosterism strategy, a series of piperidine-substituted thiophene[2,3-d]pyrimidine derivatives were designed and synthesized. Compound 9a yielded the greatest potency, exhibiting significantly better anti-HIV-1 activity than ETR against all of the tested NNRTI-resistant HIV-1 strains. In addition, the phenotypic (cross)resistance of 9a and other NRTIs to the different selected HIV-1 strains was evaluated. As expected, no phenotypic cross-resistance against the NRTIs (AZT and PMPA) was observed with the mutant 9ares strain. Furthermore, 9a was identified with improved solubility, lower CYP liability, and hERG inhibition. Remarkably, 9a exhibited optimal pharmacokinetic properties in rats (F = 37.06%) and safety in mice (LD50 > 2000 mg/kg), which highlights 9a as a promising anti-HIV-1 drug candidate. DOI : 10.1021/acs.jmedchem.0c00117
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate after 10 mins in presence of NADPH
Liver
IC50 = 660.0 nM
Reference
Title : Identification of Dihydrofuro[3,4- d]pyrimidine Derivatives as Novel HIV-1 Non-Nucleoside Reverse Transcriptase Inhibitors with Promising Antiviral Activities and Desirable Physicochemical Properties. Authors : Kang D, Zhang H, Wang Z, Zhao T, Ginex T, Luque FJ, Yang Y, Wu G, Feng D, Wei F, Zhang J, De Clercq E, Pannecouque C, Chen CH, Lee KH, Murugan NA, Steitz TA, Zhan P, Liu X. Publication Year :
2019 Journal : J Med Chem Abstract : To address drug resistance to HIV-1 non-nucleoside reverse transcriptase inhibitors (NNRTIs), a series of novel diarylpyrimidine (DAPY) derivatives targeting "tolerant region I" and "tolerant region II" of the NNRTIs binding pocket (NNIBP) were designed utilizing a structure-guided scaffold-hopping strategy. The dihydrofuro[3,4- d]pyrimidine derivatives 13c2 and 13c4 proved to be exceptionally potent against a wide range of HIV-1 strains carrying single NNRTI-resistant mutations (EC<sub>50</sub> = 0.9-8.4 nM), which were remarkably superior to that of etravirine (ETV). Meanwhile, both compounds exhibited comparable activities with ETV toward the virus with double mutations F227L+V106A and K103N+Y181C. Furthermore, the most active compound 13c2 showed favorable pharmacokinetic properties with an oral bioavailability of 30.96% and a half-life of 11.1 h, which suggested that 13c2 is worth further investigation as a novel NNRTI to circumvent drug resistance. DOI : 10.1021/acs.jmedchem.8b01656
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate after 10 mins in presence of NADP by LC-MS/MS analysis
Liver
IC50 = 847.0 nM
Reference
Title : Exploiting the Tolerant Region I of the Non-Nucleoside Reverse Transcriptase Inhibitor (NNRTI) Binding Pocket: Discovery of Potent Diarylpyrimidine-Typed HIV-1 NNRTIs against Wild-Type and E138K Mutant Virus with Significantly Improved Water Solubility and Favorable Safety Profiles. Authors : Huang B, Chen W, Zhao T, Li Z, Jiang X, Ginex T, Vílchez D, Luque FJ, Kang D, Gao P, Zhang J, Tian Y, Daelemans D, De Clercq E, Pannecouque C, Zhan P, Liu X. Publication Year :
2019 Journal : J Med Chem Abstract : Diarylpyrimidine derivatives (DAPYs) exhibit robust anti-HIV-1 potency, although they have been compromised by E138K variant and severe side-effects and been suffering from poor water solubility. In the present work, hydrophilic morpholine or methylsulfonyl and sulfamide-substituted piperazine/piperidines were introduced into the right wing of DAPYs targeting the solvent-exposed tolerant region I. The anti-HIV-1 activities of 11c (EC50(WT) = 0.0035 μM, EC50(E138K) = 0.0075 μM) were the same as and 2-fold better than that of the lead etravirine against the wild-type and E138K mutant HIV-1, respectively, with a relative low cytotoxicity (CC50 ≥ 173 μM). Further test showed a significant improvement in the water solubility of 11c. Besides, 11c displayed no significant inhibition on main cytochrome P450 enzymes and exhibited no acute/subacute toxicities at doses of 2000 mg·kg-1/50 mg·kg-1 in mice. Taken together, we consider that 11c is a promising lead for further structural optimization. DOI : 10.1021/acs.jmedchem.8b01729
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac substrate in presence of NADPH incubated for 10 mins
Liver
IC50 = 609.0 nM
Reference
Title : Discovery and Characterization of Fluorine-Substituted Diarylpyrimidine Derivatives as Novel HIV-1 NNRTIs with Highly Improved Resistance Profiles and Low Activity for the hERG Ion Channel. Authors : Kang D, Ruiz FX, Feng D, Pilch A, Zhao T, Wei F, Wang Z, Sun Y, Fang Z, De Clercq E, Pannecouque C, Arnold E, Liu X, Zhan P. Publication Year :
2020 Journal : J Med Chem Abstract : Our previous efforts have led to the development of two potent NNRTIs, K-5a2 and 25a, exhibiting effective anti-HIV-1 potency and resistance profiles compared with etravirine. However, both inhibitors suffered from potent hERG inhibition and short half-life. In this article, with K-5a2 and etravirine as leads, series of novel fluorine-substituted diarylpyrimidine derivatives were designed via molecular hybridization and bioisosterism strategies. The results indicated 24b was the most active inhibitor, exhibiting broad-spectrum activity (EC50 = 3.60-21.5 nM) against resistant strains, significantly lower cytotoxicity (CC50= 155 μM), and reduced hERG inhibition (IC50 > 30 μM). Crystallographic studies confirmed the binding of 24b and the role of the fluorine atom, as well as optimal contacts of a nitrile group with the main-chain carbonyl group of H235. Furthermore, 24b showed longer half-life and favorable safety properties. All the results demonstrated that 24b has significant promise in circumventing drug resistance as an anti-HIV-1 candidate. DOI : 10.1021/acs.jmedchem.9b01769
SULFAPHENAZOLE
Inhibition of human CYP2C9 by fluorescence method
—
IC50 = 280.0 nM
Reference
Title : Development of Robust 17(R),18(S)-Epoxyeicosatetraenoic Acid (17,18-EEQ) Analogues as Potential Clinical Antiarrhythmic Agents. Authors : Adebesin AM, Wesser T, Vijaykumar J, Konkel A, Paudyal MP, Lossie J, Zhu C, Westphal C, Puli N, Fischer R, Schunck WH, Falck JR. Publication Year :
2019 Journal : J Med Chem Abstract : 17(R),18(S)-Epoxyeicosatetraenoic acid (EEQ) is a cytochrome P450 metabolite of eicosapentaenoic acid (EPA) and a powerful negative chronotrope with low nanomolar activity in a neonatal rat cardiomyocyte (NRCM) arrhythmia model. Prior studies identified oxamide 2b as a soluble epoxide hydrolase (sEH) stable replacement but unsuitable for in vivo applications due to limited oral bioavailability and metabolic stability. These ADME limitations have been addressed in an improved generation of negative chronotropes, e.g., 4 and 16, which were evaluated as potential clinical candidates. DOI : 10.1021/acs.jmedchem.9b00952
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsome using probe substrate measured after 20 mins in presence of NADPH by LC-MS/MS analysis
Liver
IC50 = 609.0 nM
Reference
Title : Novel Human Urate Transporter 1 Inhibitors as Hypouricemic Drug Candidates with Favorable Druggability. Authors : Zhao T,Meng Q,Sun Z,Chen Y,Ai W,Zhao Z,Kang D,Dong Y,Liang R,Wu T,Pang J,Liu X,Zhan P Publication Year :
2020 Journal : J Med Chem Abstract : Lesinurad, a human urate transporter 1 (URAT1) inhibitor approved as a medication for the treatment of hyperuricemia associated with gout in 2015, can cause liver and renal toxicity. Here, we modified all three structural components of lesinurad by applying scaffold hopping, bioisosterism, and substituent-decorating strategies. In a mouse model of acute hyperuricemia, 21 of the synthesized compounds showed increased serum uric acid (SUA)-reducing activity; SUA was about 4-fold lower in animals treated with 44, 54, and 83 compared with lesinurad or benzbromarone. In the URAT1 inhibition assay, 44 was over 8-fold more potent than lesinurad (IC: 1.57 μM vs 13.21 μM). Notably, 83 also displayed potent inhibitory activity (IC = 31.73 μM) against GLUT9. Furthermore, we also preliminarily explored the effect of chirality on the potency of the promising derivatives 44 and 54. Compounds 44, 54, and 83 showed favorable drug-like pharmacokinetics and appear to be promising candidates for the treatment of hyperuricemia and gout. DOI : 10.1021/acs.jmedchem.0c00223
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes after 20 mins by LC-MS/MS analysis
Liver
IC50 = 770.0 nM
Reference
Title : Discovery of a Conformationally Constrained Oxazolidinone with Improved Safety and Efficacy Profiles for the Treatment of Multidrug-Resistant Tuberculosis. Authors : Zhao H,Wang B,Fu L,Li G,Lu H,Liu Y,Sheng L,Li Y,Zhang B,Lu Y,Ma C,Huang H,Zhang D,Lu Y Publication Year :
2020 Journal : J Med Chem Abstract : Tuberculosis (TB) remains a serious public health challenge, and the research and development of new anti-TB drugs is an essential component of the global strategy to eradicate TB. In this work, we discovered a conformationally constrained oxazolidinone 19c with improved anti-TB activity and safety profile through a focused lead optimization effort. Compound 19c displayed superior in vivo efficacy in a mouse TB infection model compared to linezolid and sutezolid. The druggability of compound 19c was demonstrated in a panel of assays including microsomal stability, cytotoxicity, cytochrome P450 enzyme inhibition, and pharmacokinetics in animals. Compound 19c demonstrated an excellent safety profile in a battery of safety assays, including mitochondrial protein synthesis, hERG K, hCav1.2, and Nav1.5 channels, monoamine oxidase, and genotoxicity. In a 4 week repeated dose toxicology study in rats, 19c appeared to have less bone marrow suppression than linezolid, which has been a major liability of the oxazolidinone class. DOI : 10.1021/acs.jmedchem.0c00500
SULFAPHENAZOLE
Inhibition of CYP2C9 (unknown origin)
—
IC50 = 630.0 nM
Reference
Title : The optimization and characterization of functionalized sulfonamides derived from sulfaphenazole against Mycobacterium tuberculosis with reduced CYP 2C9 inhibition. Authors : Chen H,Wang B,Li P,Yan H,Li G,Huang H,Lu Y Publication Year :
2021 Journal : Bioorg Med Chem Lett Abstract : In this study, a series of sulfonamide compounds was designed and synthesized through the systematic optimization of the antibacterial agent sulfaphenazole for the treatment of Mycobacterium tuberculosis (M. tuberculosis). Preliminary results indicate that the 4-aminobenzenesulfonamide moiety plays a key role in maintaining antimycobacterial activity. Compounds 10c, 10d, 10f and 10i through the optimization on phenyl ring at the R site on the pyrazole displayed promising antimycobacterial activity paired with low cytotoxicity. In particular, compound 10d displayed good activity (MIC = 5.69 μg/mL) with low inhibition of CYP 2C9 (IC > 10 μM), consequently low potential risk of drug-drug interaction. These promising results provide new insight into the combination regimen using sulfonamide as one component for the treatment of M. tuberculosis. DOI : 10.1016/j.bmcl.2021.127924
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate incubated for 5 mins followed by NADPH addition and measured after 20 mins by LC-MS/MS analysis
Liver
IC50 = 893.0 nM
Reference
Title : Substituted benzothiophene and benzofuran derivatives as a novel class of bone morphogenetic Protein-2 upregulators: Synthesis, anti-osteoporosis efficacies in ovariectomized rats and a zebrafish model, and ADME properties. Authors : Xue ST,Zhang L,Xie ZS,Jin J,Guo HF,Yi H,Liu ZY,Li ZR Publication Year :
2020 Journal : Eur J Med Chem Abstract : The bone morphogenetic protein (BMP) pathway is a promising new target for the design of therapeutic agents for the treatment of low bone mass. This study optimized the structure of the anti-osteoporosis compound 38 by balancing its lipophilicity and improving its stability. Twenty derivatives which were not reported in the literature were designed and synthesized. The ovariectomized rat model of osteoporosis was selected to evaluate the therapeutic effects. Compound 125 showed better therapeutic efficacy than that of 38. We verified the anti-osteoporosis activity and BMP-2 protein upregulation after treatment with 125 in a zebrafish osteoporosis model. We found that 125 improved the ADME properties, therapeutic efficacy, and pharmacokinetics of the drug. Overall, we evaluated the anti-osteoporosis effects of the compounds of this type, preliminarily determined the target patient population, verified the mechanism of action, clarified the level of toxicity, and provided preliminary ADME data. We believe that these compounds can both correct bone loss that is already occurring in patients and have broad clinical applicability. DOI : 10.1016/j.ejmech.2020.112465
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using Diclofenac as substrate measured after 20 mins by LC-MS/MS analysis
Liver
IC50 = 367.0 nM
Reference
Title : Authors : Publication Year : Journal :
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate in presence of NADPH incubated for 10 mins by LC-MS/MS analysis
Liver
IC50 = 586.0 nM
Reference
Title : Authors : Publication Year : Journal :
SULFAPHENAZOLE
Inhibition of CYP2C9 in human liver microsome using tolbutamide as substrate
Liver
IC50 = 641.0 nM
Reference
Title : Authors : Publication Year : Journal :
TOLBUTAMIDE
Inhibition of human CYP2C9 at 10 uM
—
Inhibition = 87.68 %
Reference
Title : Novel Pyrrolopyridone Bromodomain and Extra-Terminal Motif (BET) Inhibitors Effective in Endocrine-Resistant ER+ Breast Cancer with Acquired Resistance to Fulvestrant and Palbociclib. Authors : Li Y, Zhao J, Gutgesell LM, Shen Z, Ratia K, Dye K, Dubrovskyi O, Zhao H, Huang F, Tonetti DA, Thatcher GRJ, Xiong R. Publication Year :
2020 Journal : J Med Chem Abstract : Acquired resistance to fulvestrant and palbociclib is a new challenge to treatment of estrogen receptor positive (ER+) breast cancer. ER is expressed in most resistance settings; thus, bromodomain and extra-terminal protein inhibitors (BETi) that target BET-amplified ER-mediated transcription have therapeutic potential. Novel pyrrolopyridone BETi leveraged novel interactions with L92/L94 confirmed by a cocrystal structure of 27 with BRD4. Optimization of BETi using growth inhibition in fulvestrant-resistant (MCF-7:CFR) cells was confirmed in endocrine-resistant, palbociclib-resistant, and ESR1 mutant cell lines. 27 was more potent in MCF-7:CFR cells than six BET inhibitors in clinical trials. Transcriptomic analysis differentiated 27 from the benchmark BETi, JQ-1, showing downregulation of oncogenes and upregulation of tumor suppressors and apoptosis. The therapeutic approach was validated by oral administration of 27 in orthotopic xenografts of endocrine-resistant breast cancer in monotherapy and in combination with fulvestrant. Importantly, at an equivalent dose in rats, thrombocytopenia was mitigated. DOI : 10.1021/acs.jmedchem.0c00456
VALPROIC ACID
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VALSARTAN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VORINOSTAT
Percent inhibition of CYP450 2C9 at 1 uM concentration
—
Inhibition = 28.0 %
Reference
Title : Identification and optimisation of a series of substituted 5-pyridin-2-yl-thiophene-2-hydroxamic acids as potent histone deacetylase (HDAC) inhibitors. Authors : Price S, Bordogna W, Braganza R, Bull RJ, Dyke HJ, Gardan S, Gill M, Harris NV, Heald RA, van den Heuvel M, Lockey PM, Lloyd J, Molina AG, Roach AG, Roussel F, Sutton JM, White AB. Publication Year :
2007 Journal : Bioorg. Med. Chem. Lett. Abstract : Further investigation of a series of thienyl-based hydroxamic acids that included ADS100380 and ADS102550 led to the identification of the 5-pyridin-2-yl-thiophene-2-hydroxamic acid 3c, which possessed modest HDAC inhibitory activity. Substitution at the 5- and 6-positions of the pyridyl ring of compound 3c provided compounds 5a-g, 7a, b, 9, and 13a. Compound 5b demonstrated improved potency, in vitro DMPK profile, and rat oral bioavailability, compared to ADS102550. Functionalisation of the pendent phenyl group of compounds 5b, 5e and 13a provided analogues that possessed excellent enzyme inhibition and anti-proliferative activity. DOI : 10.1016/j.bmcl.2006.10.045
ZAFIRLUKAST
Time dependent inhibition of CYP2C9 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ALISKIREN
Inhibition of CYP2C8 in human liver microsomes from 10 healthy donors at 200 uM aliskiren (SPP100)
Liver
Inhibition = 4.5 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibition of CYP2C9 in human liver microsomes from 10 healthy donors at 200 uM aliskiren (SPP100)
Liver
Inhibition = 32.1 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 227 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 13.1 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 259 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 0.9 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 258 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 1.3 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 222 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 14.9 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 201 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 23.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 220 Pmoles of cDNA-derived CYP2C9 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 15.8 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
AMIODARONE
Inhibition of CYP2C9-mediated diclofenac metabolite formation in human liver microsomes at 5 uM after 8 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 68.3 %
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
AMLODIPINE
Time dependent inhibition of CYP2C9 (unknown origin) at 30 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMODIAQUINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ATORVASTATIN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BATEFENTEROL
Inhibition of CYP2C9 (unknown origin) at 600 nM
—
Inhibition < 20.0 %
Reference
Title : Discovery of (R)-1-(3-((2-chloro-4-(((2-hydroxy-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethyl)amino)methyl)-5-methoxyphenyl)amino)-3-oxopropyl)piperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate (TD-5959, GSK961081, batefenterol): first-in-class dual pharmacology multivalent muscarinic antagonist and β₂ agonist (MABA) for the treatment of chronic obstructive pulmonary disease (COPD). Authors : Hughes AD, Chen Y, Hegde SS, Jasper JR, Jaw-Tsai S, Lee TW, McNamara A, Pulido-Rios MT, Steinfeld T, Mammen M. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Through application of our multivalent approach to drug discovery we previously reported the first discovery of dual pharmacology MABA bronchodilators, exemplified by 1. Herein we describe the subsequent lead optimization of both muscarinic antagonist and β2 agonist activities, through modification of the linker motif, to achieve 24 h duration of action in a guinea pig bronchoprotection model. Concomitantly we targeted high lung selectivities, low systemic exposures and identified crystalline forms suitable for inhalation devices. This article culminates with the discovery of our first clinical candidate 12f (TD-5959, GSK961081, batefenterol). In a phase 2b trial, batefenterol produced statistical and clinically significant differences compared to placebo and numerically greater improvements in the primary end point of trough FEV1 compared to salmeterol after 4 weeks of dosing in patients with moderate to severe chronic obstructive pulmonary disease (COPD). DOI : 10.1021/jm501915g
BENZBROMARONE
Time dependent inhibition of CYP2C9 (unknown origin) at 1 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BENZBROMARONE
Inhibition of human CYP2C9
—
Ki = 19.0 nM
Reference
Title : Charge and substituent effects on affinity and metabolism of benzbromarone-based CYP2C19 inhibitors. Authors : Locuson CW, Suzuki H, Rettie AE, Jones JP. Publication Year :
2004 Journal : J. Med. Chem. Abstract : Human cytochrome P450 (CYP) 2C19 is one of the most important CYP2C family members responsible for metabolizing commonly prescribed drugs. This research describes synthetic modifications to benzbromarone (Bzbr) to create the most potent CYP2C19 inhibitor ever reported. The most important features enabling analogues of Bzbr to bind to CYP2C19 with high affinity are low acidity (high pK(a) or nonionizability) and hydrophobic substituents adjacent to the phenol moiety. Though CYP2C19 was known to prefer neutral substrates, the extent was perhaps not realized until the anionic, parent compound Bzbr (K(i) = 3.7 microM) was compared to a less acidic dimethyl analogue (K(i) = 0.033 microM). However, differences in affinity for anionic and neutral Bzbr analogues did not appear to affect the regiospecificity of their metabolism by CYP's 2C19 and 2C9. In addition, some Bzbr analogues were metabolized both on the phenol and benzofuran rings. By using a substrate with a methyl ether in place of the Bzbr phenol, it was shown that some Bzbr analogues must be able to freely reposition after binding and oxidize the more energetically favorable position. Normally, O-demethylation of this methyl ether is favored over benzofuran hydroxylation based on ion current from LC/MS. Deuterium substitution of the methyl ether results in an inverse isotope effect on benzofuran hydroxylation (i.e. increased oxidation of this less favorable site). Likewise, Bzbr-based CoMFA models of CYP2C19 demonstrated no clear preference for any one ligand alignment. This suggests results from this modeling method must be interpreted carefully for each CYP isoform. In summary, Bzbr analogues have demonstrated they can be adapted to other CYP2C enzymes in order to probe isoform-specific properties. DOI : 10.1021/jm049605m
BENZBROMARONE
Inhibition of CYP2C9 (unknown origin)
—
IC50 = 41.0 nM
Reference
Title : Discovery of Dotinurad (FYU-981), a New Phenol Derivative with Highly Potent Uric Acid Lowering Activity. Authors : Uda J,Kobashi S,Miyata S,Ashizawa N,Matsumoto K,Iwanaga T Publication Year :
2020 Journal : ACS Med Chem Lett Abstract : To derive new uricosuric agents, novel phenol derivatives were synthesized to overcome the disadvantages of benzbromarone (BBR), attributed by its structural features. Herein, we report the discovery of new phenol derivatives with a 1,1-dioxo-1,2-dihydro-3H-1,3-benzothiazole scaffold. The selected compound 11 (dotinurad, FYU-981) demonstrated remarkable inhibitory activity on uric acid uptake by primary human renal proximal tubule epithelial cells (RPTECs) and URAT1-mediated uric acid transport, with weak inhibitory activity against mitochondrial respiration. Dotinurad also displayed favorable pharmacokinetic profiles and higher potency in decreasing uric acid than BBR did in Cebus monkeys. Dotinurad has been approved as a new uricosuric medicine in Japan. Our strategy, which focuses on the structural features resulting in unfavorable effects, could be applied to the future developments of other drugs with disadvantages, particularly those having a bis-aryl ketone structure. DOI : 10.1021/acsmedchemlett.0c00176
BENZBROMARONE
Inhibition of CYP2C9 (unknown origin)
—
IC50 = 41.0 nM
Reference
Title : Novel monocyclic amide-linked phenol derivatives without mitochondrial toxicity have potent uric acid-lowering activity. Authors : Uda J,Kobashi S,Ashizawa N,Matsumoto K,Iwanaga T Publication Year :
2021 Journal : Bioorg Med Chem Lett Abstract : Although benzbromarone (BBR) is a conventional, highly potent uricosuric drug, it is not a standard medicine because it causes rare but fatal fulminant hepatitis. We transformed the bis-aryl ketone structure of BBR to generate novel monocyclic amide-linked phenol derivatives that should possess uric acid excretion activity without adverse properties associated with BBR. The derivatives were synthesized and tested for uric acid uptake inhibition (UUI) in two assays using either urate transporter 1-expressing cells or primary human renal proximal tubule epithelial cells. We also evaluated their inhibitory activity against mitochondrial respiration as a critical mitochondrial toxicity parameter. Some derivatives with UUI activity had no mitochondrial toxicity, including compound 3f, which effectively lowered the plasma uric acid level in Cebus apella. Thus, 3f is a promising candidate for further development as a uricosuric agent. DOI : 10.1016/j.bmcl.2021.127900
CAFFEINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CFI-400945
Inhibition of CYP2C9 (unknown origin) by fluorescence assay
—
IC50 = 940.0 nM
Reference
Title : The discovery of Polo-like kinase 4 inhibitors: identification of (1R,2S).2-(3-((E).4-(((cis).2,6-dimethylmorpholino)methyl)styryl). 1H.indazol-6-yl)-5'-methoxyspiro[cyclopropane-1,3'-indolin]-2'-one (CFI-400945) as a potent, orally active antitumor agent. Authors : Sampson PB, Liu Y, Forrest B, Cumming G, Li SW, Patel NK, Edwards L, Laufer R, Feher M, Ban F, Awrey DE, Mao G, Plotnikova O, Hodgson R, Beletskaya I, Mason JM, Luo X, Nadeem V, Wei X, Kiarash R, Madeira B, Huang P, Mak TW, Pan G, Pauls HW. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Previous publications from our laboratory have introduced novel inhibitors of Polo-like kinase 4 (PLK4), a mitotic kinase identified as a potential target for cancer therapy. The search for potent and selective PLK4 inhibitors yielded (E)-3-((1Hindazol-6-yl)methylene)indolin-2-ones, which were superseded by the bioisosteric 2-(1H-indazol-6-yl)spiro[cyclopropane-1,3'-indolin]-2'-ones, e.g., 3. The later scaffold confers improved drug-like properties and incorporates two stereogenic centers. This work reports the discovery of a novel one-pot double SN2 displacement reaction for the stereoselective installation of the desired asymmetric centers and confirms the stereochemistry of the most potent stereoisomer, e.g., 44. Subsequent work keys on the optimization of the oral exposure of nanomolar PLK4 inhibitors with potent cancer cell growth inhibitory activity. A short list of compounds with superior potency and pharmacokinetic properties in rodents and dogs was studied in mouse models of tumor growth. We conclude with the identification of compound 48 (designated CFI-400945) as a novel clinical candidate for cancer therapy. DOI : 10.1021/jm5005336
CPI-1205
Inhibition of CYP2C9 (unknown origin) at 10 uM relative to control
—
Inhibition = 11.1 %
Reference
Title : Identification of (R)-N-((4-Methoxy-6-methyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-2-methyl-1-(1-(1-(2,2,2-trifluoroethyl)piperidin-4-yl)ethyl)-1H-indole-3-carboxamide (CPI-1205), a Potent and Selective Inhibitor of Histone Methyltransferase EZH2, Suitable for Phase I Clinical Trials for B-Cell Lymphomas. Authors : Vaswani RG,Gehling VS,Dakin LA,Cook AS,Nasveschuk CG,Duplessis M,Iyer P,Balasubramanian S,Zhao F,Good AC,Campbell R,Lee C,Cantone N,Cummings RT,Normant E,Bellon SF,Albrecht BK,Harmange JC,Trojer P,Audia JE,Zhang Y,Justin N,Chen S,Wilson JR,Gamblin SJ Publication Year :
2016 Journal : J Med Chem Abstract : Polycomb repressive complex 2 (PRC2) has been shown to play a major role in transcriptional silencing in part by installing methylation marks on lysine 27 of histone 3. Dysregulation of PRC2 function correlates with certain malignancies and poor prognosis. EZH2 is the catalytic engine of the PRC2 complex and thus represents a key candidate oncology target for pharmacological intervention. Here we report the optimization of our indole-based EZH2 inhibitor series that led to the identification of CPI-1205, a highly potent (biochemical IC = 0.002 μM, cellular EC = 0.032 μM) and selective inhibitor of EZH2. This compound demonstrates robust antitumor effects in a Karpas-422 xenograft model when dosed at 160 mg/kg BID and is currently in Phase I clinical trials. Additionally, we disclose the co-crystal structure of our inhibitor series bound to the human PRC2 complex. DOI : 10.1021/acs.jmedchem.6b01315
DONEPEZIL
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FASIGLIFAM
Inhibition of CYP2C9 in human liver microsomes at 5 uM using diclofenac sodium as substrate by LC-MS/MS analysis relative to control
Liver
Inhibition = 21.02 %
Reference
Title : Design, synthesis and biological evaluation of a series of novel GPR40 agonists containing nitrogen heterocyclic rings. Authors : Sun Z, Zhou T, Pan X, Yang Y, Huan Y, Xiao Z, Shen Z, Liu Z. Publication Year :
2018 Journal : Bioorg Med Chem Lett Abstract : A novel series of GPR40 agonists is designed by introducing nitrogen-containing heterocyclic ring at the terminal phenyl ring of TAK-875 with the aim of decreasing its lipophilicity. Three different β-substituted phenylpropionic acids were investigated as the acidic components. A total of 34 compounds have been synthesized, among which, compound 30 exhibited comparable GPR40 agonistic activity in vitro with TAK-875 and relatively lower lipophilicity through calculation (30, EC50 = 1.2 μM, cLogP = 1.3; TAK-875: EC50 = 5.1 μM, cLogP = 3.4). Moreover, compound 30 was able to enhance the insulin secretion of primary islets isolated from normal ICR mice and showed no obvious inhibition against cytochromes P450 in vitro. In vivo, compound 30 exhibited efficacy in oral glucose tolerance test (oGTT) in normal ICR mice. DOI : 10.1016/j.bmcl.2018.07.048
FLUOXETINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
NALMEFENE
Inhibition of human CYP2C9 at 10 uM
—
Inhibition = 35.0 %
Reference
Title : Synthesis and pharmacological evaluation of 6-naltrexamine analogs for alcohol cessation. Authors : Ghirmai S, Azar MR, Cashman JR. Publication Year :
2009 Journal : Bioorg. Med. Chem. Abstract : A series of substituted aryl amide derivatives of 6-naltrexamine, 3 designed to be metabolically stable were synthesized and used to characterize the structural requirements for their potency to binding and functional activity of human mu (mu), delta (delta) and kappa (kappa) opioid and nociceptin (NOP) receptors. Binding assays showed that 4-10 had subnanomolar K(i) values for mu and kappa opioid receptors. Functional assays for stimulation of [(35)S]GTPgammaS binding showed that several compounds acted as partial or inverse agonists and antagonists of the mu and delta, kappa opioid or NOP receptors. The compounds showed considerable stability in the presence of rat, mouse or human liver preparations and NADPH. The inhibitory activity on the functional activity of human cytochrome P450s was examined to determine any potential inhibition by 4-9. Only modest inhibition of CYP3A4, CYP2C9 and CYP2C19 was observed for a few of the analogs. As a representative example, radiolabeled 6 was examined in vivo and showed reasonable brain penetration. The inhibition of ethanol self-administration in rats trained to self-administer a 10% (w/v) ethanol solution, utilizing operant techniques showed 5-8 to have very potent efficacy (ED(50) values 19-50 microg/kg). DOI : 10.1016/j.bmc.2009.07.069
NICARDIPINE
Inhibition of human cytochrome P450 2C9
—
Ki = 280.0 nM
Reference
Title : Conformer- and alignment-independent model for predicting structurally diverse competitive CYP2C9 inhibitors. Authors : Afzelius L, Zamora I, Masimirembwa CM, Karlén A, Andersson TB, Mecucci S, Baroni M, Cruciani G. Publication Year :
2004 Journal : J. Med. Chem. Abstract : A conformer- and alignment-independent three-dimensional structure-activity relationship (3D-QSAR) model has been derived that is based on flexible molecular interaction fields calculated in GRID and the subsequent description of these fields by use of alignment-independent descriptors derived in ALMOND. The training set consisted of 22 diverse and flexible competitive inhibitors of the drug-metabolizing enzyme CYP2C9 and generated a model with r(2) of 0.81 and q(2) of 0.62. The predicitive capacity of the model was externally evaluated with a test set of 12 competitive inhibitors and 11 out of 12 were predicted within 0.5 log unit. The most relevant points of interaction in the model correlated well to the amino acids involved in CYP2C9-substrate/inhibitor binding in the active site of a CYP2C9 homology model, further validating the mechanistic sense of our model. This approach offers the possibility to derive predicitve 3D-QSAR models without the need for an alignment rule for chemically diverse ligands and in the absence of target protein crystal structure information. DOI : 10.1021/jm030972s
NICARDIPINE
Inhibition of CYP2C9 in human liver microsomes using tolbutamide substrate by LC-MS/MS method
Liver
IC50 = 660.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
NICARDIPINE
Inhibition of CYP2C9 in human liver microsomes using diclofenac as substrate after 8 mins by LC-MS/MS analysis
Liver
IC50 = 378.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
OLMESARTAN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PF-05105679
Inhibition of CYP2C9 (unknown origin) at 3 uM
—
Inhibition = 0.0 %
Reference
Title : Discovery of a Selective TRPM8 Antagonist with Clinical Efficacy in Cold-Related Pain. Authors : Andrews MD, Af Forselles K, Beaumont K, Galan SR, Glossop PA, Grenie M, Jessiman A, Kenyon AS, Lunn G, Maw G, Owen RM, Pryde DC, Roberts D, Tran TD. Publication Year :
2015 Journal : ACS Med. Chem. Lett. Abstract : The transient receptor potential (TRP) family of ion channels comprises nonselective cation channels that respond to a wide range of chemical and thermal stimuli. TRPM8, a member of the melastatin subfamily, is activated by cold temperatures (<28 °C), and antagonists of this channel have the potential to treat cold induced allodynia and hyperalgesia. However, TRPM8 has also been implicated in mammalian thermoregulation and antagonists have the potential to induce hypothermia in patients. We report herein the identification and optimization of a series of TRPM8 antagonists that ultimately led to the discovery of PF-05105679. The clinical finding with this compound will be discussed, including both efficacy and its ability to affect thermoregulation processes in humans. DOI : 10.1021/ml500479v
PLINABULIN
Inhibition of CYP2C9 in human liver microsomes preincubated for 10 mins followed by NADPH addition measured after 10 mins by LC-MS/MS analysis
Liver
IC50 = 530.0 nM
Reference
Title : In vitro and in vivo pharmacokinetic and pharmacodynamic study of MBRI-001, a deuterium-substituted plinabulin derivative as a potent anti-cancer agent. Authors : Ma M, Zhao J, Cheng H, Deng M, Ding Z, Hou Y, Li F, Dou G, Li W. Publication Year :
2018 Journal : Bioorg Med Chem Abstract : MBRI-001 was demonstrated preliminary better pharmacokinetics and antitumor effects than that of plinabulin in vivo. In this approach, we further carried out systematic pharmacokinetic and pharmacodynamic study of MBRI-001 in vitro and in vivo. MBRI-001 was tested stable in rat plasma and more stable in liver microsomes than plinabulin in vitro. In vivo, MBRI-001 could be distributed rapidly and widely in various tissues, especially the concentration of MBRI-001 in lung was remarkably higher than other tissues. Excretion study indicated that MBRI-001 might been decomposed and excreted as metabolites. Additionally, the combination treatment of MBRI-001 and gefitinib revealed better antitumor inhibition rate than monotherapy in vivo. Therefore, we suggest that MBRI-001 could be developed as a promising anti-cancer agent in near future. DOI : 10.1016/j.bmc.2018.08.009
PRAVASTATIN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROCAINAMIDE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROPRANOLOL
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
QUINIDINE
Inhibition of CYP2C9 in human liver microsomes assessed as tolbutamide hydroxylation to hydroxytolbutamide at 10 uM after 10 mins relative to control
Liver
Inhibition = 9.0 %
Reference
Title : Rational development of 4-aminopyridyl-based inhibitors targeting Trypanosoma cruzi CYP51 as anti-chagas agents. Authors : Choi JY, Calvet CM, Gunatilleke SS, Ruiz C, Cameron MD, McKerrow JH, Podust LM, Roush WR. Publication Year :
2013 Journal : J. Med. Chem. Abstract : A new series of 4-aminopyridyl-based lead inhibitors targeting Trypanosoma cruzi CYP51 (TcCYP51) has been developed using structure-based drug design as well as structure-property relationship (SPR) analyses. The screening hit starting point, LP10 (KD ≤ 42 nM; EC50 = 0.65 μM), has been optimized to give the potential leads 14t, 27i, 27q, 27r, and 27t, which have low-nanomolar binding affinity to TcCYP51 and significant activity against T. cruzi amastigotes cultured in human myoblasts (EC50 = 14-18 nM for 27i and 27r). Many of the optimized compounds have improved microsome stability, and most are selective against human CYPs 1A2, 2D6, and 3A4 (<50% inhibition at 1 μM). A rationale for the improvement in microsome stability and selectivity of inhibitors against human metabolic CYP enzymes is presented. In addition, the binding mode of 14t with the Trypanosoma brucei CYP51 (TbCYP51) orthologue has been characterized by X-ray structure analysis. DOI : 10.1021/jm401067s
RIMONABANT
Inhibition of CYP2C9 in human liver microsomes after 30 mins
Liver
IC50 = 5.3 nM
Reference
Title : Discovery of 2-(4-((1H-1,2,4-triazol-1-yl)methyl)-5-(4-bromophenyl)-1-(2-chlorophenyl)-1H-pyrazol-3-yl)-5-tert-butyl-1,3,4-thiadiazole (GCC2680) as a potent, selective and orally efficacious cannabinoid-1 receptor antagonist. Authors : Lee J, Seo HJ, Lee SH, Kim J, Jung ME, Lee SH, Song KS, Lee J, Kang SY, Kim MJ, Kim MS, Son EJ, Lee M, Han HK. Publication Year :
2010 Journal : Bioorg. Med. Chem. Abstract : Structure-activity relationship studies in a series of diarylpyrazolyl thiadiazoles identified cannabinoid-1 receptor antagonists with excellent potency and selectivity. Based on its exceptional in vivo efficacy in animal models and its favorable pharmacokinetic and toxicological profiles, 2-(4-((1H-1,2,4-triazol-1-yl)methyl)-5-(4-bromophenyl)-1-(2-chlorophenyl)-1H-pyrazol-3-yl)-5-tert-butyl-1,3,4-thiadiazole (GCC2680) was selected as a preclinical candidate for the treatment of obesity. DOI : 10.1016/j.bmc.2010.07.013
ROSIGLITAZONE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TALAZOPARIB
Inhibition of CYP2C9 (unknown origin) at 10 uM
—
Inhibition < 12.0 %
Reference
Title : Discovery and Characterization of (8S,9R)-5-Fluoro-8-(4-fluorophenyl)-9-(1-methyl-1H-1,2,4-triazol-5-yl)-2,7,8,9-tetrahydro-3H-pyrido[4,3,2-de]phthalazin-3-one (BMN 673, Talazoparib), a Novel, Highly Potent, and Orally Efficacious Poly(ADP-ribose) Polymerase-1/2 Inhibitor, as an Anticancer Agent. Authors : Wang B, Chu D, Feng Y, Shen Y, Aoyagi-Scharber M, Post LE. Publication Year :
2016 Journal : J. Med. Chem. Abstract : We discovered and developed a novel series of tetrahydropyridophthlazinones as poly(ADP-ribose) polymerase (PARP) 1 and 2 inhibitors. Lead optimization led to the identification of (8S,9R)-47 (talazoparib; BMN 673; (8S,9R)-5-fluoro-8-(4-fluorophenyl)-9-(1-methyl-1H-1,2,4-triazol-5-yl)-2,7,8,9-tetrahydro-3H-pyrido[4,3,2-de]phthalazin-3-one). The novel stereospecific dual chiral-center-embedded structure of this compound has enabled extensive and unique binding interactions with PARP1/2 proteins. (8S,9R)-47 demonstrates excellent potency, inhibiting PARP1 and PARP2 enzyme activity with Ki = 1.2 and 0.87 nM, respectively. It inhibits PARP-mediated PARylation in a whole-cell assay with an EC50 of 2.51 nM and prevents proliferation of cancer cells carrying mutant BRCA1/2, with EC50 = 0.3 nM (MX-1) and 5 nM (Capan-1), respectively. (8S,9R)-47 is orally available, displaying favorable pharmacokinetic (PK) properties and remarkable antitumor efficacy in the BRCA1 mutant MX-1 breast cancer xenograft model following oral administration as a single-agent or in combination with chemotherapy agents such as temozolomide and cisplatin. (8S,9R)-47 has completed phase 1 clinical trial and is currently being studied in phase 2 and 3 clinical trials for the treatment of locally advanced and/or metastatic breast cancer with germline BRCA1/2 deleterious mutations. DOI : 10.1021/acs.jmedchem.5b01498
TAMOXIFEN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TARANABANT
Inhibition of CYP2C9 in human liver microsomes after 30 mins
Liver
IC50 = 0.93 nM
Reference
Title : Discovery of 2-(4-((1H-1,2,4-triazol-1-yl)methyl)-5-(4-bromophenyl)-1-(2-chlorophenyl)-1H-pyrazol-3-yl)-5-tert-butyl-1,3,4-thiadiazole (GCC2680) as a potent, selective and orally efficacious cannabinoid-1 receptor antagonist. Authors : Lee J, Seo HJ, Lee SH, Kim J, Jung ME, Lee SH, Song KS, Lee J, Kang SY, Kim MJ, Kim MS, Son EJ, Lee M, Han HK. Publication Year :
2010 Journal : Bioorg. Med. Chem. Abstract : Structure-activity relationship studies in a series of diarylpyrazolyl thiadiazoles identified cannabinoid-1 receptor antagonists with excellent potency and selectivity. Based on its exceptional in vivo efficacy in animal models and its favorable pharmacokinetic and toxicological profiles, 2-(4-((1H-1,2,4-triazol-1-yl)methyl)-5-(4-bromophenyl)-1-(2-chlorophenyl)-1H-pyrazol-3-yl)-5-tert-butyl-1,3,4-thiadiazole (GCC2680) was selected as a preclinical candidate for the treatment of obesity. DOI : 10.1016/j.bmc.2010.07.013
TICLOPIDINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VERAPAMIL
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
WARFARIN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
IMIPRAMINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ABIRATERONE
Inhibition of human hepatic CYP2C9 at 1 uM relative to control
—
Inhibition = 31.6 %
Reference
Title : Discovery of novel 1,2,3,4-tetrahydrobenzo[4, 5]thieno[2, 3-c]pyridine derivatives as potent and selective CYP17 inhibitors. Authors : Wang M, Fang Y, Gu S, Chen F, Zhu Z, Sun X, Zhu J. Publication Year :
2017 Journal : Eur J Med Chem Abstract : The inhibition of CYP17 to block androgen biosynthesis is a well validated strategy for the treatment of prostate cancer. Herein we reported the design, synthesis and structure-activity relationship (SAR) study for a series of novel 1,2,3,4- tetrahydrobenzo[4,5]thieno[2,3-c]pyridine derivatives. Some analogs demonstrated a potent inhibition to both rat and human CYP17 protein and reduced testosterone production in human H295R cell line. Some analogs also showed high selectivity against other CYP enzymes such as 3A4, 1A2, 2C9, 2C19 and 2D6, which may limit side effects due to drug-drug interactions. Among these analogs, the most potent compound 9c showed 1.5 fold more potent against rat and human CYP17 protein than that of abiraterone (IC50 = 16 nM and 20 nM vs. 25 nM and 36 nM respectively). In NCI-H295R cells, the inhibitory effect of compound 9c on testosterone production (52± 2%) was also more potent than that of abiraterone (74± 15%) at the concentration of 1 μM. Further, it was shown that 9c reduced plasma testosterone level in a dose-dependent manner in Sprague-Dawley rats. Thus, analog 9c maybe a potential agent used for the treatment of prostate cancer. DOI : 10.1016/j.ejmech.2017.03.037
ABIRATERONE
Inhibition of human hepatic CYP2C9 at 10 uM relative to control
—
Inhibition = 82.5 %
Reference
Title : Discovery of novel 1,2,3,4-tetrahydrobenzo[4, 5]thieno[2, 3-c]pyridine derivatives as potent and selective CYP17 inhibitors. Authors : Wang M, Fang Y, Gu S, Chen F, Zhu Z, Sun X, Zhu J. Publication Year :
2017 Journal : Eur J Med Chem Abstract : The inhibition of CYP17 to block androgen biosynthesis is a well validated strategy for the treatment of prostate cancer. Herein we reported the design, synthesis and structure-activity relationship (SAR) study for a series of novel 1,2,3,4- tetrahydrobenzo[4,5]thieno[2,3-c]pyridine derivatives. Some analogs demonstrated a potent inhibition to both rat and human CYP17 protein and reduced testosterone production in human H295R cell line. Some analogs also showed high selectivity against other CYP enzymes such as 3A4, 1A2, 2C9, 2C19 and 2D6, which may limit side effects due to drug-drug interactions. Among these analogs, the most potent compound 9c showed 1.5 fold more potent against rat and human CYP17 protein than that of abiraterone (IC50 = 16 nM and 20 nM vs. 25 nM and 36 nM respectively). In NCI-H295R cells, the inhibitory effect of compound 9c on testosterone production (52± 2%) was also more potent than that of abiraterone (74± 15%) at the concentration of 1 μM. Further, it was shown that 9c reduced plasma testosterone level in a dose-dependent manner in Sprague-Dawley rats. Thus, analog 9c maybe a potential agent used for the treatment of prostate cancer. DOI : 10.1016/j.ejmech.2017.03.037
CHLOROQUINE
Inhibition of CYP2C9 in human liver microsomes assessed as metabolite produced at 1 uM by LC-MS/MS analysis relative to control
Liver
Inhibition = 114.0 %
Reference
Title : Development of a new generation of 4-aminoquinoline antimalarial compounds using predictive pharmacokinetic and toxicology models. Authors : Ray S, Madrid PB, Catz P, LeValley SE, Furniss MJ, Rausch LL, Guy RK, DeRisi JL, Iyer LV, Green CE, Mirsalis JC. Publication Year :
2010 Journal : J. Med. Chem. Abstract : Among the known antimalarial drugs, chloroquine (CQ) and other 4-aminoquinolines have shown high potency and good bioavailability. Yet complications associated with drug resistance necessitate the discovery of effective new antimalarial agents. ADMET prediction studies were employed to evaluate a library of new molecules based on the 4-aminoquinolone-related structure of CQ. Extensive in vitro screening and in vivo pharmacokinetic studies in mice helped to identify two lead molecules, 18 and 4, with promising in vitro therapeutic efficacy, improved ADMET properties, low risk for drug-drug interactions, and desirable pharmacokinetic profiles. Both 18 and 4 are highly potent antimalarial compounds, with IC(50) values of 5.6 and 17.3 nM, respectively, against the W2 (CQ-resistant) strain of Plasmodium falciparum (for CQ, IC(50) = 382 nM). When tested in mice, these compounds were found to have biological half-lives and plasma exposure values similar to or higher than those of CQ; they are therefore desirable candidates to pursue in future clinical trials. DOI : 10.1021/jm100057h
CHLOROQUINE
Inhibition of CYP2C9 in human liver microsomes assessed as metabolite produced at 10 uM by LC-MS/MS analysis relative to control
Liver
Inhibition = 128.0 %
Reference
Title : Development of a new generation of 4-aminoquinoline antimalarial compounds using predictive pharmacokinetic and toxicology models. Authors : Ray S, Madrid PB, Catz P, LeValley SE, Furniss MJ, Rausch LL, Guy RK, DeRisi JL, Iyer LV, Green CE, Mirsalis JC. Publication Year :
2010 Journal : J. Med. Chem. Abstract : Among the known antimalarial drugs, chloroquine (CQ) and other 4-aminoquinolines have shown high potency and good bioavailability. Yet complications associated with drug resistance necessitate the discovery of effective new antimalarial agents. ADMET prediction studies were employed to evaluate a library of new molecules based on the 4-aminoquinolone-related structure of CQ. Extensive in vitro screening and in vivo pharmacokinetic studies in mice helped to identify two lead molecules, 18 and 4, with promising in vitro therapeutic efficacy, improved ADMET properties, low risk for drug-drug interactions, and desirable pharmacokinetic profiles. Both 18 and 4 are highly potent antimalarial compounds, with IC(50) values of 5.6 and 17.3 nM, respectively, against the W2 (CQ-resistant) strain of Plasmodium falciparum (for CQ, IC(50) = 382 nM). When tested in mice, these compounds were found to have biological half-lives and plasma exposure values similar to or higher than those of CQ; they are therefore desirable candidates to pursue in future clinical trials. DOI : 10.1021/jm100057h
CLOPIDOGREL
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PIOGLITAZONE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ZOMEPIRAC
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
SULFAMETHAZINE
Inhibition of human CYP2C9 assessed as (S)-Flurbiprofen hydroxylation
—
Inhibition = -18.8 %
Reference
Title : Use of simple docking methods to screen a virtual library for heteroactivators of cytochrome P450 2C9. Authors : Locuson CW, Gannett PM, Ayscue R, Tracy TS. Publication Year :
2007 Journal : J. Med. Chem. Abstract : Several laboratories have demonstrated that activation of drug metabolism by P450s may occur via a mechanism that resembles allosterism from an enzyme kinetic standpoint. Because the effector drug binding site may be located in the same P450 binding pocket where the drug substrate is located, the ability to find and characterize novel effectors (aka heteroactivators) will prove to be important in probing the mechanism of activation. We have used analogues of the prototypical CYP2C9 heteroactivator dapsone to validate a simple docking method that can be used to predict heteroactivators based on ligand binding location in a P450 crystal structure. As proof of concept for the described docking method, a protocol was developed to discover potential heteroactivators from a virtual chemical library through efficient sorting of >40,000 compounds. One of the top-scoring compounds identified was verified to be a CYP2C9 heteroactivator in vitro, and it possessed activity similar to dapsone. DOI : 10.1021/jm060706p
DORAMAPIMOD
Inhibition of CYP2C9 (unknown origin) at 30 uM
—
Inhibition = 13.0 %
Reference
Title : Discovery of Narrow Spectrum Kinase Inhibitors: New Therapeutic Agents for the Treatment of COPD and Steroid-Resistant Asthma. Authors : Onions ST, Ito K, Charron CE, Brown RJ, Colucci M, Frickel F, Hardy G, Joly K, King-Underwood J, Kizawa Y, Knowles I, Murray PJ, Novak A, Rani A, Rapeport G, Smith A, Strong P, Taddei DM, Williams JG. Publication Year :
2016 Journal : J. Med. Chem. Abstract : The discovery of a novel series of therapeutic agents that has been designed and optimized for treating chronic obstructive pulmonary disease is reported. The pharmacological strategy was based on the identification of compounds that inhibit a defined subset of kinase enzymes modulating inflammatory processes that would be effective against steroid refractory disease and exhibit a sustained duration of action after inhaled delivery. DOI : 10.1021/acs.jmedchem.5b01029
AMINOPYRINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PF-00562271
Inhibition of CYP2C9 (unknown origin) at 10 uM relative to control
—
Inhibition = 42.7 %
Reference
Title : Authors : Publication Year : Journal :
LUMINESPIB
Inhibition of CYP2C9 in human liver microsomes at 10 uM after 20 mins
Liver
Inhibition = 46.0 %
Reference
Title : Discovery of potent N-(isoxazol-5-yl)amides as HSP90 inhibitors. Authors : Chen D, Shen A, Li J, Shi F, Chen W, Ren J, Liu H, Xu Y, Wang X, Yang X, Sun Y, Yang M, He J, Wang Y, Zhang L, Huang M, Geng M, Xiong B, Shen J. Publication Year :
2014 Journal : Eur. J. Med. Chem. Abstract : HSP90 is ubiquitously overexpressed in a broad spectrum of human cancers and has been recognized as an attractive target for cancer treatment. Here, we described the fragment screening, synthesis and structure-activity relationship studies of small molecule inhibitors with 4,5-diarylisoxazole scaffold targeting HSP90. Among them, the compound N-(3-(2,4-dihydroxy-5-isopropylphenyl)-4-(4-((4-morpholinopiperidin-1-yl)methyl)phenyl)isoxazol-5-yl)cyclopropanecarboxamide (108) showed high affinity for binding to HSP90 (FP binding assay, IC50 = 0.030 μM) and inhibited the proliferation of various human cancer cell lines with averaging GI50 about 88 nM. Compound 108 exhibited its functional inhibition of HSP90 by depleting key signaling pathways and concomitantly elevating of HSP70 and HSP27 in U-87MG cells. Further in vivo studies showed that compound 108 strongly suppressed the tumor growth of human glioblastoma xenograft model U-87MG with T/C = 18.35% at 50 mg/kg q3w/2.5w. Moreover, compound 108 also exhibited good pharmacokinetic properties. Together, our study implicates that compound 108 is a promising candidate of HSP90 inhibitor and is currently advanced to preclinical study. DOI : 10.1016/j.ejmech.2014.09.065
CHS-828
Reversible inhibition of CYP2C9 in human liver microsomes using (S)-warfarin as substrate in presence of NADPH by LC-MS/MS analysis
Liver
IC50 = 120.0 nM
Reference
Title : Minimizing CYP2C9 Inhibition of Exposed-Pyridine NAMPT (Nicotinamide Phosphoribosyltransferase) Inhibitors. Authors : Zak M, Yuen PW, Liu X, Patel S, Sampath D, Oeh J, Liederer BM, Wang W, O'Brien T, Xiao Y, Skelton N, Hua R, Sodhi J, Wang Y, Zhang L, Zhao G, Zheng X, Ho YC, Bair KW, Dragovich PS. Publication Year :
2016 Journal : J Med Chem Abstract : NAMPT inhibitors may show potential as therapeutics for oncology. Throughout our NAMPT inhibitor program, we found that exposed pyridines or related heterocyclic systems in the left-hand portion of the inhibitors are necessary pharmacophores for potent cellular NAMPT inhibition. However, when combined with a benzyl group in the center of the inhibitors, such pyridine-like moieties also led to consistent and potent inhibition of CYP2C9. In an attempt to reduce CYP2C9 inhibition, a parallel synthesis approach was used to identify central benzyl group replacements with increased Fsp3. A spirocyclic central motif was thus discovered that was combined with left-hand pyridines (or pyridine-like systems) to provide cellularly potent NAMPT inhibitors with minimal CYP2C9 inhibition. Further optimization of potency and ADME properties led to the discovery of compound 68, a highly potent NAMPT inhibitor with outstanding efficacy in a mouse tumor xenograft model and lacking measurable CYP2C9 inhibition at the concentrations tested. DOI : 10.1021/acs.jmedchem.6b00697
ADL-5747
Inhibition of human CYP2C9 at 10 uM
—
Inhibition = 11.4 %
Reference
Title : Spirocyclic delta opioid receptor agonists for the treatment of pain: discovery of N,N-diethyl-3-hydroxy-4-(spiro[chromene-2,4'-piperidine]-4-yl) benzamide (ADL5747). Authors : Le Bourdonnec B, Windh RT, Leister LK, Zhou QJ, Ajello CW, Gu M, Chu GH, Tuthill PA, Barker WM, Koblish M, Wiant DD, Graczyk TM, Belanger S, Cassel JA, Feschenko MS, Brogdon BL, Smith SA, Derelanko MJ, Kutz S, Little PJ, DeHaven RN, DeHaven-Hudkins DL, Dolle RE. Publication Year :
2009 Journal : J. Med. Chem. Abstract : Selective, nonpeptidic delta opioid receptor agonists have been the subject of great interest as potential novel analgesic agents. The discoveries of BW373U86 (1) and SNC80 (2) contributed to the rapid expansion of research in this field. However, poor drug-like properties and low therapeutic indices have prevented clinical evaluation of these agents. Doses of 1 and 2 similar to those required for analgesic activity produce convulsions in rodents and nonhuman primates. Recently, we described a novel series of potent, selective, and orally bioavailable delta opioid receptor agonists. The lead derivative, ADL5859 (4), is currently in phase II proof-of-concept studies for the management of pain. Further structure activity relationship exploration has led to the discovery of ADL5747 (36), which is approximately 50-fold more potent than 4 in an animal model of inflammatory pain. On the basis of its favorable efficacy, safety, and pharmacokinetic profile, 36 was selected as a clinical candidate for the treatment of pain. DOI : 10.1021/jm900773n
FIBOFLAPON
Inhibition of human CYP2C9
—
IC50 > 50.0 nM
Reference
Title : 5-Lipoxygenase-activating protein (FLAP) inhibitors. Part 4: development of 3-[3-tert-butylsulfanyl-1-[4-(6-ethoxypyridin-3-yl)benzyl]-5-(5-methylpyridin-2-ylmethoxy)-1H-indol-2-yl]-2,2-dimethylpropionic acid (AM803), a potent, oral, once daily FLAP inhibitor. Authors : Stock NS, Bain G, Zunic J, Li Y, Ziff J, Roppe J, Santini A, Darlington J, Prodanovich P, King CD, Baccei C, Lee C, Rong H, Chapman C, Broadhead A, Lorrain D, Correa L, Hutchinson JH, Evans JF, Prasit P. Publication Year :
2011 Journal : J. Med. Chem. Abstract : The potent 5-lipoxygenase-activating protein (FLAP) inhibitor 3-[3-tert-butylsulfanyl-1-[4-(6-ethoxypyridin-3-yl)benzyl]-5-(5-methylpyridin-2-ylmethoxy)-1H-indol-2-yl]-2,2-dimethylpropionic acid 11cc is described (AM803, now GSK2190915). Building upon AM103 (1) (Hutchinson et al. J. Med Chem.2009, 52, 5803-5815; Stock et al. Bioorg. Med. Chem. Lett. 2010, 20, 213-217; Stock et al. Bioorg. Med. Chem. Lett.2010, 20, 4598-4601), SAR studies centering around the pyridine moiety led to the discovery of compounds that exhibit significantly increased potency in a human whole blood assay measuring LTB(4) inhibition with longer drug preincubation times (15 min vs 5 h). Further studies identified 11cc with a potency of 2.9 nM in FLAP binding, an IC(50) of 76 nM for inhibition of LTB(4) in human blood (5 h incubation) and excellent preclinical toxicology and pharmacokinetics in rat and dog. 11cc also demonstrated an extended pharmacodynamic effect in a rodent bronchoalveolar lavage (BAL) model. This compound has successfully completed phase 1 clinical studies in healthy volunteers and is currently undergoing phase 2 trials in asthmatic patients. DOI : 10.1021/jm2008369
ASTEMIZOLE
Inhibition of CYP2C9-mediated diclofenac metabolite formation in human liver microsomes at 0.3 uM after 8 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = -2.7 %
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
TACRINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BERGAPTEN
Inhibition of recombinant human CYP2C9 expressed in baker's yeast-derived microsomes (Sacchrosomes) at 10 uM using 3-cyano-7-ethoxycoumarin substrate by EROD assay relative to control
—
Inhibition = 4.0 %
Reference
Title : Identification of karanjin isolated from the Indian beech tree as a potent CYP1 enzyme inhibitor with cellular efficacy <i>via</i> screening of a natural product repository. Authors : Joshi P, Sonawane VR, Williams IS, McCann GJP, Gatchie L, Sharma R, Satti N, Chaudhuri B, Bharate SB. Publication Year :
2018 Journal : MedChemComm Abstract : CYP1A1 is thought to mediate carcinogenesis in oral, lung and epithelial cancers. In order to identify a CYP1A1 inhibitor from an edible plant, 394 natural products in the IIIM's natural product repository were screened, at 10 μM concentration, using CYP1A1-Sacchrosomes™ (<i>i.e.</i> microsomal enzyme isolated from recombinant baker's yeast). Twenty-seven natural products were identified that inhibited 40-97% of CYP1A1's 7-ethoxyresorufin-<i>O</i>-deethylase activity. The IC<sub>50</sub> values of the 'hits', belonging to different chemical scaffolds, were determined. Their selectivity was studied against a panel of 8 CYP-Sacchrosomes™. In order to assess cellular efficacy, the 'hits' were screened for their capability to inhibit CYP enzymes expressed within live recombinant human embryonic kidney (HEK293) cells from plasmids encoding specific CYP genes (1A2, 1B1, 2C9, 2C19, 2D6, 3A4). Isopimpinellin (IN-475; IC<sub>50</sub>, 20 nM) and karanjin (IN-195; IC<sub>50</sub>, 30 nM) showed the most potent inhibition of CYP1A1 in human cells. Isopimpinellin is found in celery, parsnip, fruits and in the rind and pulp of limes whereas different parts of the Indian beech tree, which contain karanjin, have been used in traditional medicine. Both isopimpinellin and karanjin negate the cellular toxicity of CYP1A1-mediated benzo[<i>a</i>]pyrene. Molecular docking and molecular dynamic simulations with CYP isoforms rationalize the observed trends in the potency and selectivity of isopimpinellin and karanjin. DOI : 10.1039/C7MD00388A
TICRYNAFEN
Time dependent inhibition of CYP2C9 (unknown origin) at 10 uM by LC/MS system
—
Inhibition = 28.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
MAVELERTINIB
Inhibition of human CYP2C9 at 10 uM
—
Inhibition < 30.0 %
Reference
Title : Discovery of N-((3R,4R)-4-Fluoro-1-(6-((3-methoxy-1-methyl-1H-pyrazol-4-yl)amino)-9-methyl-9H-purin-2-yl)pyrrolidine-3-yl)acrylamide (PF-06747775) through Structure-Based Drug Design: A High Affinity Irreversible Inhibitor Targeting Oncogenic EGFR Mutants with Selectivity over Wild-Type EGFR. Authors : Planken S, Behenna DC, Nair SK, Johnson TO, Nagata A, Almaden C, Bailey S, Ballard TE, Bernier L, Cheng H, Cho-Schultz S, Dalvie D, Deal JG, Dinh DM, Edwards MP, Ferre RA, Gajiwala KS, Hemkens M, Kania RS, Kath JC, Matthews J, Murray BW, Niessen S, Orr ST, Pairish M, Sach NW, Shen H, Shi M, Solowiej J, Tran K, Tseng E, Vicini P, Wang Y, Weinrich SL, Zhou R, Zientek M, Liu L, Luo Y, Xin S, Zhang C, Lafontaine J. Publication Year :
2017 Journal : J Med Chem Abstract : Mutant epidermal growth factor receptor (EGFR) is a major driver of non-small-cell lung cancer (NSCLC). Marketed first generation inhibitors, such as erlotinib, effect a transient beneficial response in EGFR mutant NSCLC patients before resistance mechanisms render these inhibitors ineffective. Secondary oncogenic EGFR mutations account for approximately 50% of relapses, the most common being the gatekeeper T790M substitution that renders existing therapies ineffective. The discovery of PF-06459988 (1), an irreversible pyrrolopyrimidine inhibitor of EGFR T790M mutants, was recently disclosed.1 Herein, we describe our continued efforts to achieve potency across EGFR oncogenic mutations and improved kinome selectivity, resulting in the discovery of clinical candidate PF-06747775 (21), which provides potent EGFR activity against the four common mutants (exon 19 deletion (Del), L858R, and double mutants T790M/L858R and T790M/Del), selectivity over wild-type EGFR, and desirable ADME properties. Compound 21 is currently being evaluated in phase-I clinical trials of mutant EGFR driven NSCLC. DOI : 10.1021/acs.jmedchem.6b01894
LY-2886721
Inhibition of CYP2C9 in human liver microsomes at 10 uM using diclofenac as substrate preincubated for 10 mins followed by substrate and NADPH addition measured after 3 mins by LC-MS/MS analysis
Liver
Inhibition = 48.0 %
Reference
Title : Authors : Publication Year : Journal :
AZD-3759
Inhibition of CYP2C9 (unknown origin)
—
IC50 > 50.0 nM
Reference
Title : Discovery and Evaluation of Clinical Candidate AZD3759, a Potent, Oral Active, Central Nervous System-Penetrant, Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitor. Authors : Zeng Q, Wang J, Cheng Z, Chen K, Johnström P, Varnäs K, Li DY, Yang ZF, Zhang X. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Recent reports suggest that an increasing number of patients with lung cancer, especially those with activating mutations of the epidermal growth factor receptor (EGFR), also present with brain metastases and leptomeningeal metastases. These patients have poor prognosis as there are no approved drugs for these indications. Available agents have poor efficacy for these patients even at well above their standard dose. Herein, we report the discovery of (4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl (2R)-2,4-dimethylpiperazine-1-carboxylate 1m (AZD3759), an investigational drug currently in Phase 1 clinical trial, which has excellent central nervous system penetration and which induces profound regression of brain metastases in a mouse model. DOI : 10.1021/acs.jmedchem.5b01073
VACTOSERTIB
Inhibition of CYP2C9 in human liver microsomes using tolbutamide as substrate at 10 uM incubated for 5 mins prior to substrate addition measured after 10 mins by LC/MS/MS analysis
Liver
Inhibition = 30.1 %
Reference
Title : Discovery of N-((4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-5-(6-methylpyridin-2-yl)-1H-imidazol-2-yl)methyl)-2-fluoroaniline (EW-7197): a highly potent, selective, and orally bioavailable inhibitor of TGF-β type I receptor kinase as cancer immunotherapeutic/antifibrotic agent. Authors : Jin CH, Krishnaiah M, Sreenu D, Subrahmanyam VB, Rao KS, Lee HJ, Park SJ, Park HJ, Lee K, Sheen YY, Kim DK. Publication Year :
2014 Journal : J. Med. Chem. Abstract : A series of 2-substituted-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-5-(6-methylpyridin-2-yl)imidazoles was synthesized and evaluated to optimize a prototype inhibitor of TGF-β type I receptor kinase (ALK5), 6. Combination of replacement of a quinoxalin-6-yl moiety of 6 with a [1,2,4]triazolo[1,5-a]pyridin-6-yl moiety, insertion of a methyleneamino linker, and a o-F substituent in the phenyl ring markedly increased ALK5 inhibitory activity, kinase selectivity, and oral bioavailability. The 12b (EW-7197) inhibited ALK5 with IC50 value of 0.013 μM in a kinase assay and with IC50 values of 0.0165 and 0.0121 μM in HaCaT (3TP-luc) stable cells and 4T1 (3TP-luc) stable cells, respectively, in a luciferase assay. Selectivity profiling of 12b using a panel of 320 protein kinases revealed that it is a highly selective ALK5/ALK4 inhibitor. Pharmacokinetic study with 12b·HCl in rats showed an oral bioavailability of 51% with high systemic exposure (AUC) of 1426 ng × h/mL and maximum plasma concentration (Cmax) of 1620 ng/mL. Rational optimization of 6 has led to the identification of a highly potent, selective, and orally bioavailable ALK5 inhibitor 12b. DOI : 10.1021/jm500115w
INDOMETHACIN
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PLUMBAGIN
Inhibition of recombinant human CYP2C9 expressed in baker's yeast-derived microsomes (Sacchrosomes) at 10 uM using 3-cyano-7-ethoxycoumarin substrate by EROD assay relative to control
—
Inhibition = 11.0 %
Reference
Title : Identification of karanjin isolated from the Indian beech tree as a potent CYP1 enzyme inhibitor with cellular efficacy <i>via</i> screening of a natural product repository. Authors : Joshi P, Sonawane VR, Williams IS, McCann GJP, Gatchie L, Sharma R, Satti N, Chaudhuri B, Bharate SB. Publication Year :
2018 Journal : MedChemComm Abstract : CYP1A1 is thought to mediate carcinogenesis in oral, lung and epithelial cancers. In order to identify a CYP1A1 inhibitor from an edible plant, 394 natural products in the IIIM's natural product repository were screened, at 10 μM concentration, using CYP1A1-Sacchrosomes™ (<i>i.e.</i> microsomal enzyme isolated from recombinant baker's yeast). Twenty-seven natural products were identified that inhibited 40-97% of CYP1A1's 7-ethoxyresorufin-<i>O</i>-deethylase activity. The IC<sub>50</sub> values of the 'hits', belonging to different chemical scaffolds, were determined. Their selectivity was studied against a panel of 8 CYP-Sacchrosomes™. In order to assess cellular efficacy, the 'hits' were screened for their capability to inhibit CYP enzymes expressed within live recombinant human embryonic kidney (HEK293) cells from plasmids encoding specific CYP genes (1A2, 1B1, 2C9, 2C19, 2D6, 3A4). Isopimpinellin (IN-475; IC<sub>50</sub>, 20 nM) and karanjin (IN-195; IC<sub>50</sub>, 30 nM) showed the most potent inhibition of CYP1A1 in human cells. Isopimpinellin is found in celery, parsnip, fruits and in the rind and pulp of limes whereas different parts of the Indian beech tree, which contain karanjin, have been used in traditional medicine. Both isopimpinellin and karanjin negate the cellular toxicity of CYP1A1-mediated benzo[<i>a</i>]pyrene. Molecular docking and molecular dynamic simulations with CYP isoforms rationalize the observed trends in the potency and selectivity of isopimpinellin and karanjin. DOI : 10.1039/C7MD00388A
EXEMESTANE
Drug metabolism assessed as human recombinant CYP2C9-mediated 17-hydroexemestane and 6-Hydroxymethylexemestane formation assessed as inhibition of metabolite formation at 10 uM after 10 mins by Michaelis-Menten saturation curve analysis in presence of 50 uM sulfaphenazole
—
Inhibition < 20.0 %
Reference
Title : In vitro cytochrome P450-mediated metabolism of exemestane. Authors : Kamdem LK, Flockhart DA, Desta Z. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Exemestane is a potent and irreversible steroidal aromatase inhibitor drug used for the treatment of estrogen receptor-positive breast cancer. Our aim was to identify and assess the contribution of the specific cytochromes P450 (P450s) responsible for exemestane primary in vitro metabolism. With the use of high-performance liquid chromatography and liquid chromatography-tandem mass spectrometry analytical techniques, 17-hydroexemestane (MI) formation and 6-hydroxymethylexemestane (MII) formation were found to be the predominant exemestane metabolic pathways. In a bank of 15 well characterized human liver microsomes with known P450 isoform-specific activities, the MI formation rate correlated significantly with CYP1A2 (Spearman r = 0.60, p = 0.02) and CYP4A11 (Spearman r = 0.67, p = 0.01) isoform-specific activities, whereas the MII production rate significantly correlated with CYP2B6 (Spearman r = 0.57, p = 0.03) and CYP3A (Spearman r = 0.76, p = 0.005) isoform-specific activities. Recombinant CYP1A1 metabolized exemestane to MI with a catalytic efficiency (Cl(int)) of 150 nl/pmol P450 × min that was at least 3.5-fold higher than those of other P450s investigated. Recombinant CYP3A4 catalyzed MII formation from exemestane with a catalytic efficiency of 840 nl/pmol P450 × min that was at least 4-fold higher than those of other P450s investigated. Among a panel of 10 chemical inhibitors tested, only ketoconazole and troleandomycin (CYP3A-specific chemical inhibitors) significantly inhibited the formation of MII by 45 and 95%, respectively. None of them markedly inhibited the formation of MI. In summary, exemestane seems to be metabolized to MI by multiple P450s that include CYP4A11 and CYP1A1/2, whereas its oxidation to MII is primarily mediated by CYP3A. DOI : 10.1124/dmd.110.032276
NEVIRAPINE
Time dependent inhibition of CYP2C9 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
OLVEREMBATINIB
Inhibition of human recombinant CYP2C9 after 30 mins
—
IC50 = 110.0 nM
Reference
Title : Identification of GZD824 as an orally bioavailable inhibitor that targets phosphorylated and nonphosphorylated breakpoint cluster region-Abelson (Bcr-Abl) kinase and overcomes clinically acquired mutation-induced resistance against imatinib. Authors : Ren X, Pan X, Zhang Z, Wang D, Lu X, Li Y, Wen D, Long H, Luo J, Feng Y, Zhuang X, Zhang F, Liu J, Leng F, Lang X, Bai Y, She M, Tu Z, Pan J, Ding K, Ding K. Publication Year :
2013 Journal : J. Med. Chem. Abstract : Bcr-Abl(T315I) mutation-induced imatinib resistance remains a major challenge for clinical management of chronic myelogenous leukemia (CML). Herein, we report GZD824 (10a) as a novel orally bioavailable inhibitor against a broad spectrum of Bcr-Abl mutants including T315I. It tightly bound to Bcr-Abl(WT) and Bcr-Abl(T315I) with K(d) values of 0.32 and 0.71 nM, respectively, and strongly inhibited the kinase functions with nanomolar IC(50) values. The compound potently suppressed proliferation of Bcr-Abl-positive K562 and Ku812 human CML cells with IC(50) values of 0.2 and 0.13 nM, respectively. It also displayed good oral bioavailability (48.7%), a reasonable half-life (10.6 h), and promising in vivo antitumor efficacy. It induced tumor regression in mouse xenograft tumor models driven by Bcr-Abl(WT) or the mutants and significantly improved the survival of mice bearing an allograft leukemia model with Ba/F3 cells harboring Bcr-Abl(T315I). GZD824 represents a promising lead candidate for development of Bcr-Abl inhibitors to overcome acquired imatinib resistance. DOI : 10.1021/jm301581y
ALDUMASTAT
Inhibition of CYP2C9 (unknown origin) at 10 uM
—
Inhibition < 50.0 %
Reference
Title : Authors : Publication Year : Journal :
ZIMLOVISERTIB
Inhibition of CYP2C9 in human liver microsomes at 3 uM
Liver
Inhibition < 5.0 %
Reference
Title : Discovery of Clinical Candidate 1-{[(2S,3S,4S)-3-Ethyl-4-fluoro-5-oxopyrrolidin-2-yl]methoxy}-7-methoxyisoquinoline-6-carboxamide (PF-06650833), a Potent, Selective Inhibitor of Interleukin-1 Receptor Associated Kinase 4 (IRAK4), by Fragment-Based Drug Design. Authors : Lee KL, Ambler CM, Anderson DR, Boscoe BP, Bree AG, Brodfuehrer JI, Chang JS, Choi C, Chung S, Curran KJ, Day JE, Dehnhardt CM, Dower K, Drozda SE, Frisbie RK, Gavrin LK, Goldberg JA, Han S, Hegen M, Hepworth D, Hope HR, Kamtekar S, Kilty IC, Lee A, Lin LL, Lovering FE, Lowe MD, Mathias JP, Morgan HM, Murphy EA, Papaioannou N, Patny A, Pierce BS, Rao VR, Saiah E, Samardjiev IJ, Samas BM, Shen MWH, Shin JH, Soutter HH, Strohbach JW, Symanowicz PT, Thomason JR, Trzupek JD, Vargas R, Vincent F, Yan J, Zapf CW, Wright SW. Publication Year :
2017 Journal : J Med Chem Abstract : Through fragment-based drug design focused on engaging the active site of IRAK4 and leveraging three-dimensional topology in a ligand-efficient manner, a micromolar hit identified from a screen of a Pfizer fragment library was optimized to afford IRAK4 inhibitors with nanomolar potency in cellular assays. The medicinal chemistry effort featured the judicious placement of lipophilicity, informed by co-crystal structures with IRAK4 and optimization of ADME properties to deliver clinical candidate PF-06650833 (compound 40). This compound displays a 5-unit increase in lipophilic efficiency from the fragment hit, excellent kinase selectivity, and pharmacokinetic properties suitable for oral administration. DOI : 10.1021/acs.jmedchem.7b00231
DS-1971
Inhibition of CYP2C9 (unknown origin) at 10 uM relative to control
—
Inhibition = 70.0 %
Reference
Title : Discovery of DS-1971a, a Potent, Selective Na<sub>V</sub>1.7 Inhibitor. Authors : Shinozuka T, Kobayashi H, Suzuki S, Tanaka K, Karanjule N, Hayashi N, Tsuda T, Tokumaru E, Inoue M, Ueda K, Kimoto H, Domon Y, Takahashi S, Kubota K, Yokoyama T, Shimizugawa A, Koishi R, Fujiwara C, Asano D, Sakakura T, Takasuna K, Abe Y, Watanabe T, Kitano Y. Publication Year :
2020 Journal : J Med Chem Abstract : A highly potent, selective Na<sub>V</sub>1.7 inhibitor, DS-1971a, has been discovered. Exploration of the left-hand phenyl ring of sulfonamide derivatives (<b>I</b> and <b>II</b>) led to the discovery of novel series of cycloalkane derivatives with high Na<sub>V</sub>1.7 inhibitory potency in vitro. As the right-hand heteroaromatic ring affected the mechanism-based inhibition liability of CYP3A4, replacement of this moiety resulted in the generation of 4-pyrimidyl derivatives. Additionally, GSH adducts formation, which can cause idiosyncratic drug toxicity, was successfully avoided by this modification. An additional optimization led to the discovery of DS-1971a. In preclinical studies, DS-1971a demonstrated highly potent selective in vitro profile with robust efficacy in vivo. DS-1971a exhibited a favorable toxicological profile, which enabled multiple-dose studies of up to 600 mg bid or 400 mg tid (1200 mg/day) administered for 14 days to healthy human males. DS-1971a is expected to exert potent efficacy in patients with peripheral neuropathic pain, with a favorable safety profile. DOI : 10.1021/acs.jmedchem.0c00259
DS-1971
Inhibition of CYP2C9 (unknown origin) at 10 uM relative to control
—
Inhibition = 86.8 %
Reference
Title : Discovery of DS-1971a, a Potent, Selective Na<sub>V</sub>1.7 Inhibitor. Authors : Shinozuka T, Kobayashi H, Suzuki S, Tanaka K, Karanjule N, Hayashi N, Tsuda T, Tokumaru E, Inoue M, Ueda K, Kimoto H, Domon Y, Takahashi S, Kubota K, Yokoyama T, Shimizugawa A, Koishi R, Fujiwara C, Asano D, Sakakura T, Takasuna K, Abe Y, Watanabe T, Kitano Y. Publication Year :
2020 Journal : J Med Chem Abstract : A highly potent, selective Na<sub>V</sub>1.7 inhibitor, DS-1971a, has been discovered. Exploration of the left-hand phenyl ring of sulfonamide derivatives (<b>I</b> and <b>II</b>) led to the discovery of novel series of cycloalkane derivatives with high Na<sub>V</sub>1.7 inhibitory potency in vitro. As the right-hand heteroaromatic ring affected the mechanism-based inhibition liability of CYP3A4, replacement of this moiety resulted in the generation of 4-pyrimidyl derivatives. Additionally, GSH adducts formation, which can cause idiosyncratic drug toxicity, was successfully avoided by this modification. An additional optimization led to the discovery of DS-1971a. In preclinical studies, DS-1971a demonstrated highly potent selective in vitro profile with robust efficacy in vivo. DS-1971a exhibited a favorable toxicological profile, which enabled multiple-dose studies of up to 600 mg bid or 400 mg tid (1200 mg/day) administered for 14 days to healthy human males. DS-1971a is expected to exert potent efficacy in patients with peripheral neuropathic pain, with a favorable safety profile. DOI : 10.1021/acs.jmedchem.0c00259
EMAVUSERTIB
Inhibition of CYP2C9 (unknown origin) at 1 uM relative to control
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CANNABIDIOL
Mixed type inhibition of human recombinant CYP2C19 using (S)-mephenytoin as substrate preincubated for 5 mins followed by NADPH-generating system addition measured after 40 mins by Lineweaver-Burk plot analysis
—
Ki = 790.0 nM
Reference
Title : The Essential Medicinal Chemistry of Cannabidiol (CBD). Authors : Nelson KM,Bisson J,Singh G,Graham JG,Chen SN,Friesen JB,Dahlin JL,Niemitz M,Walters MA,Pauli GF Publication Year :
2020 Journal : J Med Chem Abstract : This Perspective of the published essential medicinal chemistry of cannabidiol (CBD) provides evidence that the popularization of CBD-fortified or CBD-labeled health products and CBD-associated health claims lacks a rigorous scientific foundation. CBD's reputation as a cure-all puts it in the same class as other "natural" panaceas, where valid ethnobotanicals are reduced to single, purportedly active ingredients. Such reductionist approaches oversimplify useful, chemically complex mixtures in an attempt to rationalize the commercial utility of natural compounds and exploit the "natural" label. Literature evidence associates CBD with certain semiubiquitous, broadly screened, primarily plant-based substances of undocumented purity that interfere with bioassays and have a low likelihood of becoming therapeutic agents. Widespread health challenges and pandemic crises such as SARS-CoV-2 create circumstances under which scientists must be particularly vigilant about healing claims that lack solid foundational data. Herein, we offer a critical review of the published medicinal chemistry properties of CBD, as well as precise definitions of CBD-containing substances and products, distilled to reveal the essential factors that impact its development as a therapeutic agent. DOI : 10.1021/acs.jmedchem.0c00724
CARBAMAZEPINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CELECOXIB
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CLOZAPINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DICLOFENAC
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DOLUTEGRAVIR
Inhibition of CYP2C19 in human liver microsomes using S-mephenytoin as substrate at 100 uM preincubated for 20 mins with substrate prior to initiation of reaction with NADPH by HPLC analysis
Liver
Inhibition = 20.0 %
Reference
Title : In vitro investigations into the roles of drug transporters and metabolizing enzymes in the disposition and drug interactions of dolutegravir, a HIV integrase inhibitor. Authors : Reese MJ, Savina PM, Generaux GT, Tracey H, Humphreys JE, Kanaoka E, Webster LO, Harmon KA, Clarke JD, Polli JW. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Dolutegravir (DTG; S/GSK1349572) is a potent HIV-1 integrase inhibitor with a distinct resistance profile and a once-daily dose regimen that does not require pharmacokinetic boosting. This work investigated the in vitro drug transport and metabolism of DTG and assessed the potential for clinical drug-drug interactions. DTG is a substrate for the efflux transporters P-glycoprotein (Pgp) and human breast cancer resistance protein (BCRP). Its high intrinsic membrane permeability limits the impact these transporters have on DTG's intestinal absorption. UDP-glucuronosyltransferase (UGT) 1A1 is the main enzyme responsible for the metabolism of DTG in vivo, with cytochrome P450 (P450) 3A4 being a notable pathway and UGT1A3 and UGT1A9 being only minor pathways. DTG demonstrated little or no inhibition (IC(50) values > 30 μM) in vitro of the transporters Pgp, BCRP, multidrug resistance protein 2, organic anion transporting polypeptide 1B1/3, organic cation transporter (OCT) 1, or the drug metabolizing enzymes CYP1A2, 2A6, 2B6, 2C8, 2C9, 2C19, 2D6, 3A4, UGT1A1, or 2B7. Further, DTG did not induce CYP1A2, 2B6, or 3A4 mRNA in vitro using human hepatocytes. DTG does inhibit the renal OCT2 (IC(50) = 1.9 μM) transporter, which provides a mechanistic basis for the mild increases in serum creatinine observed in clinical studies. These in vitro studies demonstrate a low propensity for DTG to be a perpetrator of clinical drug interactions and provide a basis for predicting when other drugs could result in a drug interaction with DTG. DOI : 10.1124/dmd.112.048918
ERYTHROMYCIN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ETHINYL ESTRADIOL
Time dependent inhibition of CYP2C19 in human liver microsomes at 10 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FLUTAMIDE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FUROSEMIDE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
LANSOPRAZOLE
Inhibition of human CYP2C19 at 10 uM
—
Inhibition = 86.0 %
Reference
Title : Development of (E)-2-((1,4-dimethylpiperazin-2-ylidene)amino)-5-nitro-N-phenylbenzamide, ML336: Novel 2-amidinophenylbenzamides as potent inhibitors of venezuelan equine encephalitis virus. Authors : Schroeder CE, Yao T, Sotsky J, Smith RA, Roy S, Chu YK, Guo H, Tower NA, Noah JW, McKellip S, Sosa M, Rasmussen L, Smith LH, White EL, Aubé J, Jonsson CB, Chung D, Golden JE. Publication Year :
2014 Journal : J. Med. Chem. Abstract : Venezuelan equine encephalitis virus (VEEV) is an emerging pathogenic alphavirus that can cause significant disease in humans. Given the absence of therapeutic options available and the significance of VEEV as a weaponized agent, an optimization effort was initiated around a quinazolinone screening hit 1 with promising cellular antiviral activity (EC50 = 0.8 μM), limited cytotoxic liability (CC50 > 50 μM), and modest in vitro efficacy in reducing viral progeny (63-fold at 5 μM). Scaffold optimization revealed a novel rearrangement affording amidines, specifically compound 45, which was found to potently inhibit several VEEV strains in the low nanomolar range without cytotoxicity (EC50 = 0.02-0.04 μM, CC50 > 50 μM) while limiting in vitro viral replication (EC90 = 0.17 μM). Brain exposure was observed in mice with 45. Significant protection was observed in VEEV-infected mice at 5 mg kg(-1) day(-1) and viral replication appeared to be inhibited through interference of viral nonstructural proteins. DOI : 10.1021/jm501203v
LEVOFLOXACIN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
MEPHENYTOIN
Inhibition of human CYP2C19 at 10 uM
—
Inhibition = 96.83 %
Reference
Title : Novel Pyrrolopyridone Bromodomain and Extra-Terminal Motif (BET) Inhibitors Effective in Endocrine-Resistant ER+ Breast Cancer with Acquired Resistance to Fulvestrant and Palbociclib. Authors : Li Y, Zhao J, Gutgesell LM, Shen Z, Ratia K, Dye K, Dubrovskyi O, Zhao H, Huang F, Tonetti DA, Thatcher GRJ, Xiong R. Publication Year :
2020 Journal : J Med Chem Abstract : Acquired resistance to fulvestrant and palbociclib is a new challenge to treatment of estrogen receptor positive (ER+) breast cancer. ER is expressed in most resistance settings; thus, bromodomain and extra-terminal protein inhibitors (BETi) that target BET-amplified ER-mediated transcription have therapeutic potential. Novel pyrrolopyridone BETi leveraged novel interactions with L92/L94 confirmed by a cocrystal structure of 27 with BRD4. Optimization of BETi using growth inhibition in fulvestrant-resistant (MCF-7:CFR) cells was confirmed in endocrine-resistant, palbociclib-resistant, and ESR1 mutant cell lines. 27 was more potent in MCF-7:CFR cells than six BET inhibitors in clinical trials. Transcriptomic analysis differentiated 27 from the benchmark BETi, JQ-1, showing downregulation of oncogenes and upregulation of tumor suppressors and apoptosis. The therapeutic approach was validated by oral administration of 27 in orthotopic xenografts of endocrine-resistant breast cancer in monotherapy and in combination with fulvestrant. Importantly, at an equivalent dose in rats, thrombocytopenia was mitigated. DOI : 10.1021/acs.jmedchem.0c00456
MICONAZOLE
Inhibition of recombinant human CYP2C19 preincubated at 10 uM for 5 mins before fluorescent substrate addition by fluorescence assay
—
Inhibition = 8.6 %
Reference
Title : Synthesis and biological evaluation of 3-phenethylazetidine derivatives as triple reuptake inhibitors. Authors : Yun J, Han M, Song C, Cheon SH, Choi K, Hahn HG. Publication Year :
2014 Journal : Bioorg. Med. Chem. Lett. Abstract : We report the synthesis of 3-phenethylazetidine derivatives 2 and their biological activities against 5-HT, NE and DA transporters as well as microsomal stability, CYP inhibition, and hERG inhibition profiles. Compound 2at showed most potent triple reuptake inhibitor with good selectivity as a candidate for depression. DOI : 10.1016/j.bmcl.2014.06.026
MILTEFOSINE
Inhibition of human microsomal CYP2C19 expressed in baculovirus infected insect cells at 10 uM using luciferin-H EGE as substrate preincubated with enzyme/substrate mixture for 30 mins followed by further incubation with NADPH for 30 mins by CYP450 luciferase Glo assay relative to control
—
Inhibition = 7.9 %
Reference
Title : Discovery of a benzothiophene-flavonol halting miltefosine and antimonial drug resistance in Leishmania parasites through the application of medicinal chemistry, screening and genomics. Authors : Borsari C, Jiménez-Antón MD, Eick J, Bifeld E, Torrado JJ, Olías-Molero AI, Corral MJ, Santarem N, Baptista C, Severi L, Gul S, Wolf M, Kuzikov M, Ellinger B, Reinshagen J, Witt G, Linciano P, Tait A, Costantino L, Luciani R, Tejera Nevado P, Zander-Dinse D, Franco CH, Ferrari S, Moraes CB, Cordeiro-da-Silva A, Ponterini G, Clos J, Alunda JM, Costi MP. Publication Year :
2019 Journal : Eur J Med Chem Abstract : Leishmaniasis, a major health problem worldwide, has a limited arsenal of drugs for its control. The appearance of resistance to first- and second-line anti-leishmanial drugs confirms the need to develop new and less toxic drugs that overcome spontaneous resistance. In the present study, we report the design and synthesis of a novel library of 38 flavonol-like compounds and their evaluation in a panel of assays encompassing parasite killing, pharmacokinetics, genomics and ADME-Toxicity resulting in the progression of a compound in the drug discovery value chain. Compound 19, 2-(benzo[b]thiophen-3-yl)-3-hydroxy-6-methoxy-4H-chromen-4-one, exhibited a broad-spectrum activity against Leishmania spp. (EC50 1.9 μM for Leishmania infantum, 3.4 μM for L. donovani, 6.7 μM for L. major), Trypanosoma cruzi (EC50 7.5 μM) and T. brucei (EC50 0.8 μM). Focusing on anti-Leishmania activity, compound 19 challenge in vitro did not select for resistance markers in L. donovani, while a Cos-Seq screening for dominant resistance genes identified a gene locus on chromosome 36 that became ineffective at concentrations beyond EC50. Thus, compound 19 is a promising scaffold to tackle drug resistance in Leishmania infection. In vivo pharmacokinetic studies indicated that compound 19 has a long half-life (intravenous (IV): 63.2 h; per os (PO): 46.9 h) with an acceptable ADME-Toxicity profile. When tested in Leishmania infected hamsters, no toxicity and limited efficacy were observed. Low solubility and degradation were investigated spectroscopically as possible causes for the sub-optimal pharmacokinetic properties. Compound 19 resulted a specific compound based on the screening against a protein set, following the intrinsic fluorescence changes. DOI : 10.1016/j.ejmech.2019.111676
OLANZAPINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
OMEPRAZOLE
Inhibition of CYP2C19 (unknown origin) at 24 uM by luminescent readout-based method
—
Inhibition = 93.4 %
Reference
Title : Phenoxymethyl 1,3-oxazoles and 1,2,4-oxadiazoles as potent and selective agonists of free fatty acid receptor 1 (GPR40). Authors : Zahanich I, Kondratov I, Naumchyk V, Kheylik Y, Platonov M, Zozulya S, Krasavin M. Publication Year :
2015 Journal : Bioorg. Med. Chem. Lett. Abstract : A screening hit that showed a weak (EC50 = 18 μM), partial agonistic effect on GPR40 was used a prototype for expedited hit expansion effort using a set of advanced building blocks. The latter yielded several 1,3-oxazoles and 1,2,4-oxadiazoles with significantly improved potency (best EC50 = 0.058 μM). The lead compounds in each chemotype showed a very good ADME profile (aqueous solubility, plasma protein binding, microsomal stability and membrane permeability) and no appreciable inhibition of key cytochromes P450. The compounds reported are significant new starting points for further preclinical development of future diabetic agents with a mechanism of action for which a first-in-class agent is yet to be approved. DOI : 10.1016/j.bmcl.2015.06.018
OMEPRAZOLE
Inhibition of CYP2C19 (unknown origin) at 24 uM by P450-glo assay
—
Inhibition = 93.4 %
Reference
Title : Novel free fatty acid receptor 1 (GPR40) agonists based on 1,3,4-thiadiazole-2-carboxamide scaffold. Authors : Krasavin M, Lukin A, Zhurilo N, Kovalenko A, Zahanich I, Zozulya S, Moore D, Tikhonova IG. Publication Year :
2016 Journal : Bioorg. Med. Chem. Abstract : Free fatty acid receptor 1 (FFA1), previously known as GPR40 is a G protein-coupled receptor and a new target for treatment of type 2 diabetes. Two series of FFA1 agonists utilizing a 1,3,4-thiadiazole-2-caboxamide scaffold were synthetized. Both series offered significant improvement of the potency compared to the previously described 1,3,4-thiadiazole-based FFA1 agonists and high selectivity for FFA1. Molecular docking predicts new aromatic interactions with the receptor that improve agonist potency. The most potent compounds from both series were profiled for in vitro ADME properties (plasma and metabolic stability, LogD, plasma protein binding, hERG binding and CYP inhibition). One series suffered very rapid degradation in plasma and in presence of mouse liver microsomes. However, the other series delivered a lead compound that displayed a reasonable ADME profile together with the improved FFA1 potency. DOI : 10.1016/j.bmc.2016.04.065
PHENYTOIN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
RILPIVIRINE
Inhibition of CYP2C19 in human liver microsomes using S-mephenytoin substrate incubated for 10 mins in presence of NADPH
Liver
IC50 = 335.0 nM
Reference
Title : Structure-Based Bioisosterism Yields HIV-1 NNRTIs with Improved Drug-Resistance Profiles and Favorable Pharmacokinetic Properties. Authors : Kang D, Feng D, Sun Y, Fang Z, Wei F, De Clercq E, Pannecouque C, Liu X, Zhan P. Publication Year :
2020 Journal : J Med Chem Abstract : The development of efficacious NNRTIs for AIDS therapy commonly encountered the rapid generation of drug-resistant mutations, which becomes a major impediment to effective anti-HIV treatment. Using a structure-based bioisosterism strategy, a series of piperidine-substituted thiophene[2,3-d]pyrimidine derivatives were designed and synthesized. Compound 9a yielded the greatest potency, exhibiting significantly better anti-HIV-1 activity than ETR against all of the tested NNRTI-resistant HIV-1 strains. In addition, the phenotypic (cross)resistance of 9a and other NRTIs to the different selected HIV-1 strains was evaluated. As expected, no phenotypic cross-resistance against the NRTIs (AZT and PMPA) was observed with the mutant 9ares strain. Furthermore, 9a was identified with improved solubility, lower CYP liability, and hERG inhibition. Remarkably, 9a exhibited optimal pharmacokinetic properties in rats (F = 37.06%) and safety in mice (LD50 > 2000 mg/kg), which highlights 9a as a promising anti-HIV-1 drug candidate. DOI : 10.1021/acs.jmedchem.0c00117
RILPIVIRINE
Inhibition of CYP2C19 in human liver microsomes using S-mephenytoin as substrate in presence of NADPH incubated for 10 mins by LC-MS/MS analysis
Liver
IC50 = 335.0 nM
Reference
Title : Authors : Publication Year : Journal :
RILPIVIRINE
Inhibition of human CYP2C19 using S-mephenytoin as substrate in presence of NADPH incubated for 15 to 45 mins
—
IC50 = 335.0 nM
Reference
Title : Authors : Publication Year : Journal :
RITONAVIR
Time dependent inhibition of CYP2C19 in human liver microsomes at 10 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
SULFAMETHOXAZOLE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TROGLITAZONE
Inhibition of recombinant human CYP2C19 expressed in insect cell microsomes at 10 uM using Luciferin-H EGE as substrate preincubated for 20 mins followed by NADPH addition measured after 30 mins by luminometric method
—
Inhibition = 84.0 %
Reference
Title : Hedgehog pathway inhibitors of the acylthiourea and acylguanidine class show antitumor activity on colon cancer in vitro and in vivo. Authors : Vesci L, Milazzo FM, Stasi MA, Pace S, Manera F, Tallarico C, Cini E, Petricci E, Manetti F, De Santis R, Giannini G. Publication Year :
2018 Journal : Eur J Med Chem Abstract : Small series of acylguanidine and acylthiourea derivatives were synthesized in gram-scale and assayed for their ability to modulate the Hh signalling pathway. In vitro studies showed a low micromolar inhibitory activity toward tumor cell lines, while the oral administration revealed an excellent ADME profile in vivo. Compound 5 emerged as the most active and safe inhibitor of colon cancer cells both in vitro and in a xenograft mouse model. Based on these data, 5 could be prioritized to further development with the perspective of clinical studies. DOI : 10.1016/j.ejmech.2018.07.053
VALPROIC ACID
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VALSARTAN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VORINOSTAT
Percent inhibition of CYP450 2C19 at 1 uM concentration
—
Inhibition = 14.0 %
Reference
Title : Identification and optimisation of a series of substituted 5-pyridin-2-yl-thiophene-2-hydroxamic acids as potent histone deacetylase (HDAC) inhibitors. Authors : Price S, Bordogna W, Braganza R, Bull RJ, Dyke HJ, Gardan S, Gill M, Harris NV, Heald RA, van den Heuvel M, Lockey PM, Lloyd J, Molina AG, Roach AG, Roussel F, Sutton JM, White AB. Publication Year :
2007 Journal : Bioorg. Med. Chem. Lett. Abstract : Further investigation of a series of thienyl-based hydroxamic acids that included ADS100380 and ADS102550 led to the identification of the 5-pyridin-2-yl-thiophene-2-hydroxamic acid 3c, which possessed modest HDAC inhibitory activity. Substitution at the 5- and 6-positions of the pyridyl ring of compound 3c provided compounds 5a-g, 7a, b, 9, and 13a. Compound 5b demonstrated improved potency, in vitro DMPK profile, and rat oral bioavailability, compared to ADS102550. Functionalisation of the pendent phenyl group of compounds 5b, 5e and 13a provided analogues that possessed excellent enzyme inhibition and anti-proliferative activity. DOI : 10.1016/j.bmcl.2006.10.045
VORINOSTAT
Inhibition of human CYP2C19 using 3-cyano-7-ethoxycoumarin as substrate at 10 uM after 30 mins by fluorimetric analysis
—
Inhibition = 69.0 %
Reference
Title : Synthesis, biological characterization and molecular modeling insights of spirochromanes as potent HDAC inhibitors. Authors : Thaler F, Moretti L, Amici R, Abate A, Colombo A, Carenzi G, Fulco MC, Boggio R, Dondio G, Gagliardi S, Minucci S, Sartori L, Varasi M, Mercurio C. Publication Year :
2016 Journal : Eur. J. Med. Chem. Abstract : In the last decades, inhibitors of histone deacetylases (HDAC) have become an important class of anti-cancer agents. In a previous study we described the synthesis of spiro[chromane-2,4'-piperidine]hydroxamic acid derivatives able to inhibit histone deacetylase enzymes. Herein, we present our exploration for new derivatives by replacing the piperidine moiety with various cycloamines. The goal was to obtain highly potent compounds with a good in vitro ADME profile. In addition, molecular modeling studies unravelled the binding mode of these inhibitors. DOI : 10.1016/j.ejmech.2015.11.010
ZAFIRLUKAST
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ALISKIREN
Inhibition of CYP2C19 in human liver microsomes from 10 healthy donors at 200 uM aliskiren (SPP100)
Liver
Inhibition = 42.5 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 1174 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = -1.5 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 1131 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 5.1 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 1214 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = -1.9 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 1375 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = -15.4 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 1156 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 3.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 1077 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 9.6 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
AMIODARONE
Inhibition of CYP2C19-mediated S-mephenytoin metabolite formation in human liver microsomes at 5 uM after 8 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 28.6 %
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
AMLODIPINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMODIAQUINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ATORVASTATIN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BATEFENTEROL
Inhibition of CYP2C19 (unknown origin) at 600 nM
—
Inhibition < 20.0 %
Reference
Title : Discovery of (R)-1-(3-((2-chloro-4-(((2-hydroxy-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethyl)amino)methyl)-5-methoxyphenyl)amino)-3-oxopropyl)piperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate (TD-5959, GSK961081, batefenterol): first-in-class dual pharmacology multivalent muscarinic antagonist and β₂ agonist (MABA) for the treatment of chronic obstructive pulmonary disease (COPD). Authors : Hughes AD, Chen Y, Hegde SS, Jasper JR, Jaw-Tsai S, Lee TW, McNamara A, Pulido-Rios MT, Steinfeld T, Mammen M. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Through application of our multivalent approach to drug discovery we previously reported the first discovery of dual pharmacology MABA bronchodilators, exemplified by 1. Herein we describe the subsequent lead optimization of both muscarinic antagonist and β2 agonist activities, through modification of the linker motif, to achieve 24 h duration of action in a guinea pig bronchoprotection model. Concomitantly we targeted high lung selectivities, low systemic exposures and identified crystalline forms suitable for inhalation devices. This article culminates with the discovery of our first clinical candidate 12f (TD-5959, GSK961081, batefenterol). In a phase 2b trial, batefenterol produced statistical and clinically significant differences compared to placebo and numerically greater improvements in the primary end point of trough FEV1 compared to salmeterol after 4 weeks of dosing in patients with moderate to severe chronic obstructive pulmonary disease (COPD). DOI : 10.1021/jm501915g
BENZBROMARONE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CAFFEINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DONEPEZIL
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FLUOXETINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 30 uM by LC/MS system
Liver
Inhibition = 36.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FLUOXETINE
Inhibition of CYP2C19 (unknown origin) using luciferin tagged substrate preincubated for 10 mins before substrate addition
—
IC50 = 40.0 nM
Reference
Title : Discovery of potent and selective cytotoxic activity of new quinazoline-ureas against TMZ-resistant glioblastoma multiforme (GBM). Authors : Elkamhawy A, Viswanath AN, Pae AN, Kim HY, Heo JC, Park WK, Lee CO, Yang H, Kim KH, Nam DH, Seol HJ, Cho H, Roh EJ. Publication Year :
2015 Journal : Eur. J. Med. Chem. Abstract : Herein, we report new quinazoline-urea based compounds with potent cytotoxic activities against TMZ-resistant glioblastoma multiforme (GBM) cells. Low micromolar IC₅₀ values were exhibited over a panel of three primary GBM patient-derived cell cultures belonging to proneural (GBM-1), mesenchymal (GBM-2), and classical (GBM-3) subtypes. Eight compounds showed excellent selectivity indices for GBM cells comparing to a normal astrocyte cell line. In JC-1 assay, analogues 11, 12, 20, 22, and 24 exerted promising rates of mPTP opening induction towards proneural GBM subtype. Compounds 11, 20, and 24 bound to the translocator protein 18 kDa (TSPO) in submicromolar range using [(3)H] PK-11195 binding affinity assay. A homology model was built and docked models of 11, 12, 20, 22 and 24 were generated for describing their plausible binding modes in TSPO. In 3D clonogenic assay, compound 20 manifested potent tumoricidal effects on TMZ-resistant GBM cells even at submicromolar concentrations. In addition, CYP450 and hERG assays presented a safe toxicity profile of 20. Taken as a whole, this report presents compound 20 as a potent, selective and safe GBM cytotoxic agent which constitutes a promising direction against TMZ-resistant GBM. DOI : 10.1016/j.ejmech.2015.08.001
FLUOXETINE
Inhibition of CYP2C19 (unknown origin)
—
IC50 = 65.0 nM
Reference
Title : Evaluation of anti-depressant effects of phthalazinone-based triple-acting small molecules against 5-HT<sub>2A</sub>, 5-HT<sub>2C</sub>, and the serotonin transporter. Authors : Kim J, Cha E, Park WK, Lee HY, Lim SM, Kim HJ, Pae AN. Publication Year :
2020 Journal : Bioorg Med Chem Lett Abstract : Development of highly effective, safe, and fast-acting anti-depressants is urgently required for the treatment of major depressive disorder. It has been suggested that targeting 5-HT<sub>2A</sub> and 5-HT<sub>2C</sub> in addition to inhibition of serotonin reuptake may be beneficial in generating anti-depressant agents with better pharmacology and less adverse effects. We have developed phthalazinone-based compounds that potently bind to 5-HT<sub>2A</sub>, 5-HT<sub>2C</sub>, and the serotonin transporter. The representative compounds 11j and 11l displayed strong binding affinities against these targets, and showed favorable toxicity profiles as determined by hERG binding and CYP inhibition assays. Furthermore, these compounds presented promising anti-depressant effects comparable to fluoxetine and also synergistic effects with fluoxetine in forced swimming test, which implicates these compounds can be developed to help the treatment of major depressive disorder. DOI : 10.1016/j.bmcl.2019.126882
NALMEFENE
Inhibition of human CYP2C19 at 10 uM
—
Inhibition = 17.0 %
Reference
Title : Synthesis and pharmacological evaluation of 6-naltrexamine analogs for alcohol cessation. Authors : Ghirmai S, Azar MR, Cashman JR. Publication Year :
2009 Journal : Bioorg. Med. Chem. Abstract : A series of substituted aryl amide derivatives of 6-naltrexamine, 3 designed to be metabolically stable were synthesized and used to characterize the structural requirements for their potency to binding and functional activity of human mu (mu), delta (delta) and kappa (kappa) opioid and nociceptin (NOP) receptors. Binding assays showed that 4-10 had subnanomolar K(i) values for mu and kappa opioid receptors. Functional assays for stimulation of [(35)S]GTPgammaS binding showed that several compounds acted as partial or inverse agonists and antagonists of the mu and delta, kappa opioid or NOP receptors. The compounds showed considerable stability in the presence of rat, mouse or human liver preparations and NADPH. The inhibitory activity on the functional activity of human cytochrome P450s was examined to determine any potential inhibition by 4-9. Only modest inhibition of CYP3A4, CYP2C9 and CYP2C19 was observed for a few of the analogs. As a representative example, radiolabeled 6 was examined in vivo and showed reasonable brain penetration. The inhibition of ethanol self-administration in rats trained to self-administer a 10% (w/v) ethanol solution, utilizing operant techniques showed 5-8 to have very potent efficacy (ED(50) values 19-50 microg/kg). DOI : 10.1016/j.bmc.2009.07.069
NICARDIPINE
Inhibition of CYP2C19 in human liver microsomes using omeprazole substrate by LC-MS/MS method
Liver
IC50 = 560.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
OLMESARTAN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PRAVASTATIN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROCAINAMIDE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROPRANOLOL
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ROSIGLITAZONE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TALAZOPARIB
Inhibition of CYP2C19 (unknown origin) at 10 uM
—
Inhibition < 12.0 %
Reference
Title : Discovery and Characterization of (8S,9R)-5-Fluoro-8-(4-fluorophenyl)-9-(1-methyl-1H-1,2,4-triazol-5-yl)-2,7,8,9-tetrahydro-3H-pyrido[4,3,2-de]phthalazin-3-one (BMN 673, Talazoparib), a Novel, Highly Potent, and Orally Efficacious Poly(ADP-ribose) Polymerase-1/2 Inhibitor, as an Anticancer Agent. Authors : Wang B, Chu D, Feng Y, Shen Y, Aoyagi-Scharber M, Post LE. Publication Year :
2016 Journal : J. Med. Chem. Abstract : We discovered and developed a novel series of tetrahydropyridophthlazinones as poly(ADP-ribose) polymerase (PARP) 1 and 2 inhibitors. Lead optimization led to the identification of (8S,9R)-47 (talazoparib; BMN 673; (8S,9R)-5-fluoro-8-(4-fluorophenyl)-9-(1-methyl-1H-1,2,4-triazol-5-yl)-2,7,8,9-tetrahydro-3H-pyrido[4,3,2-de]phthalazin-3-one). The novel stereospecific dual chiral-center-embedded structure of this compound has enabled extensive and unique binding interactions with PARP1/2 proteins. (8S,9R)-47 demonstrates excellent potency, inhibiting PARP1 and PARP2 enzyme activity with Ki = 1.2 and 0.87 nM, respectively. It inhibits PARP-mediated PARylation in a whole-cell assay with an EC50 of 2.51 nM and prevents proliferation of cancer cells carrying mutant BRCA1/2, with EC50 = 0.3 nM (MX-1) and 5 nM (Capan-1), respectively. (8S,9R)-47 is orally available, displaying favorable pharmacokinetic (PK) properties and remarkable antitumor efficacy in the BRCA1 mutant MX-1 breast cancer xenograft model following oral administration as a single-agent or in combination with chemotherapy agents such as temozolomide and cisplatin. (8S,9R)-47 has completed phase 1 clinical trial and is currently being studied in phase 2 and 3 clinical trials for the treatment of locally advanced and/or metastatic breast cancer with germline BRCA1/2 deleterious mutations. DOI : 10.1021/acs.jmedchem.5b01498
TAMOXIFEN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TICLOPIDINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 10 uM by LC/MS system
Liver
Inhibition = 60.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TICLOPIDINE
Inhibition of human CYP2C19 at 10 uM preincubated for 10 mins with cofactor followed by mixture of enzyme-substrate addition by fluorescence assay relative to control
—
Inhibition = 104.4 %
Reference
Title : Osthol and curcumin as inhibitors of human Pgp and multidrug efflux pumps of Staphylococcus aureus: reversing the resistance against frontline antibacterial drugs Authors : Joshi P, Singh S, Wani A, Sharma S, Jain SK, Singh B, Gupta BD, Satti NK, Koul S, Khan IA, Kumar A, Bharate SB, Vishwakarma RA Publication Year :
2014 Journal : MedChemComm DOI : 10.1039/C4MD00196F
TICLOPIDINE
Inhibition of CYP2C19 in human liver microsomes using smephenytoin as substrate at 10 uM preincubated for 5 mins followed by NADPH addition measured after 20 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 89.0 %
Reference
Title : Potent and Selective Human Neuronal Nitric Oxide Synthase Inhibition by Optimization of the 2-Aminopyridine-Based Scaffold with a Pyridine Linker. Authors : Wang HY, Qin Y, Li H, Roman LJ, Martásek P, Poulos TL, Silverman RB. Publication Year :
2016 Journal : J. Med. Chem. Abstract : Neuronal nitric oxide synthase (nNOS) is an important therapeutic target for the treatment of various neurodegenerative disorders. A major challenge in the design of nNOS inhibitors focuses on potency in humans and selectivity over other NOS isoforms. Here we report potent and selective human nNOS inhibitors based on the 2-aminopyridine scaffold with a central pyridine linker. Compound 14j, the most promising inhibitor in this study, exhibits excellent potency for rat nNOS (Ki = 16 nM) with 828-fold n/e and 118-fold n/i selectivity with a Ki value of 13 nM against human nNOS with 1761-fold human n/e selectivity. Compound 14j also displayed good metabolic stability in human liver microsomes, low plasma protein binding, and minimal binding to cytochromes P450 (CYPs), although it had little to no Caco-2 permeability. DOI : 10.1021/acs.jmedchem.6b00273
TICLOPIDINE
Inhibition of human CYP2C19 in human liver microsomes at at 50 times IC50 concentration relative to control
Liver
Inhibition = 98.7 %
Reference
Title : Synthesis and Biological Investigation of Phenothiazine-Based Benzhydroxamic Acids as Selective Histone Deacetylase 6 Inhibitors. Authors : Vögerl K, Ong N, Senger J, Herp D, Schmidtkunz K, Marek M, Müller M, Bartel K, Shaik TB, Porter NJ, Robaa D, Christianson DW, Romier C, Sippl W, Jung M, Bracher F. Publication Year :
2019 Journal : J Med Chem Abstract : The phenothiazine system was identified as a favorable cap group for potent and selective histone deacetylase 6 (HDAC6) inhibitors. Here, we report the preparation and systematic variation of phenothiazines and their analogues containing a benzhydroxamic acid moiety as the zinc-binding group. We evaluated their ability to selectively inhibit HDAC6 by a recombinant HDAC enzyme assay, by determining the protein acetylation levels in cells by western blotting (tubulin vs histone acetylation), and by assessing their effects on various cancer cell lines. Structure-activity relationship studies revealed that incorporation of a nitrogen atom into the phenothiazine framework results in increased potency and selectivity for HDAC6 (more than 500-fold selectivity relative to the inhibition of HDAC1, HDAC4, and HDAC8), as rationalized by molecular modeling and docking studies. The binding mode was confirmed by co-crystallization of the potent azaphenothiazine inhibitor with catalytic domain 2 from Danio rerio HDAC6. DOI : 10.1021/acs.jmedchem.8b01090
TICLOPIDINE
Inhibition of CYP2C19 in human liver microsomes at 10 uM using mephenytoin as substrate preincubated for 5 mins followed by NADPH addition and measured after 20 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 88.0 %
Reference
Title : Novel Tetrahydropyrido[4,3-d]pyrimidines as Potent Inhibitors of Chaperone Heat Shock Protein 90. Authors : Jiang F,Wang HJ,Jin YH,Zhang Q,Wang ZH,Jia JM,Liu F,Wang L,Bao QC,Li DD,You QD,Xu XL Publication Year :
2016 Journal : J Med Chem Abstract : Heat shock protein 90 (Hsp90) is a potential target for oncology therapeutics. Some inhibitors have shown antitumor effects in clinical trials, spurring the discovery of small molecule Hsp90 inhibitors. Here, we describe the structural optimization studies of a hit compound, tetrahydropyrido[4,3-d]pyrimidine-based Hsp90 inhibitor 15, which exhibits inhibitory activity against Hsp90. A series of analogues were synthesized, and their structure-activity and structure-property relationships were analyzed. These explorations led to the discovery of compound 73, which exhibited potent in vitro activities, good physicochemical properties, favorable ADME properties, and a potent antitumor effect in an HCT116 xenograft model. Furthermore, 73 exhibited no ocular toxicity in a rat retinal damage model, suggesting it is a relatively safe Hsp90 inhibitor. As a promising antitumor agent, 73 was progressed for further preclinical evaluation. DOI : 10.1021/acs.jmedchem.6b00912
TICLOPIDINE
Inhibition of CYP2C19 in human liver Microsome using S-mephenytoin as substrate preincubated for 10 mins followed by NADPH addition and further incubated for 10 mins as substrate by LC-MS/MS analysis relative to control
Liver
Inhibition = 81.5 %
Reference
Title : Authors : Publication Year : Journal :
TICLOPIDINE
Inhibition of CYP2C19 (unknown origin) at 3 uM using S-mephenytoin as substrate relative to control
—
Inhibition = 67.0 %
Reference
Title : Authors : Publication Year : Journal :
TRANYLCYPROMINE
Inhibitory activity of 100 uM tranylcypromine on 49 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 96.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
TRANYLCYPROMINE
Inhibitory activity of 100 uM tranylcypromine on 15 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 99.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
TRANYLCYPROMINE
Inhibitory activity of 100 uM tranylcypromine on 34 Pmoles of cDNA-derived CYP2C19 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 97.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
VERAPAMIL
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
WARFARIN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
IMIPRAMINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ABIRATERONE
Inhibition of human hepatic CYP2C19 at 1 uM relative to control
—
Inhibition = 39.6 %
Reference
Title : Discovery of novel 1,2,3,4-tetrahydrobenzo[4, 5]thieno[2, 3-c]pyridine derivatives as potent and selective CYP17 inhibitors. Authors : Wang M, Fang Y, Gu S, Chen F, Zhu Z, Sun X, Zhu J. Publication Year :
2017 Journal : Eur J Med Chem Abstract : The inhibition of CYP17 to block androgen biosynthesis is a well validated strategy for the treatment of prostate cancer. Herein we reported the design, synthesis and structure-activity relationship (SAR) study for a series of novel 1,2,3,4- tetrahydrobenzo[4,5]thieno[2,3-c]pyridine derivatives. Some analogs demonstrated a potent inhibition to both rat and human CYP17 protein and reduced testosterone production in human H295R cell line. Some analogs also showed high selectivity against other CYP enzymes such as 3A4, 1A2, 2C9, 2C19 and 2D6, which may limit side effects due to drug-drug interactions. Among these analogs, the most potent compound 9c showed 1.5 fold more potent against rat and human CYP17 protein than that of abiraterone (IC50 = 16 nM and 20 nM vs. 25 nM and 36 nM respectively). In NCI-H295R cells, the inhibitory effect of compound 9c on testosterone production (52± 2%) was also more potent than that of abiraterone (74± 15%) at the concentration of 1 μM. Further, it was shown that 9c reduced plasma testosterone level in a dose-dependent manner in Sprague-Dawley rats. Thus, analog 9c maybe a potential agent used for the treatment of prostate cancer. DOI : 10.1016/j.ejmech.2017.03.037
ABIRATERONE
Inhibition of human hepatic CYP2C19 at 10 uM relative to control
—
Inhibition = 91.6 %
Reference
Title : Discovery of novel 1,2,3,4-tetrahydrobenzo[4, 5]thieno[2, 3-c]pyridine derivatives as potent and selective CYP17 inhibitors. Authors : Wang M, Fang Y, Gu S, Chen F, Zhu Z, Sun X, Zhu J. Publication Year :
2017 Journal : Eur J Med Chem Abstract : The inhibition of CYP17 to block androgen biosynthesis is a well validated strategy for the treatment of prostate cancer. Herein we reported the design, synthesis and structure-activity relationship (SAR) study for a series of novel 1,2,3,4- tetrahydrobenzo[4,5]thieno[2,3-c]pyridine derivatives. Some analogs demonstrated a potent inhibition to both rat and human CYP17 protein and reduced testosterone production in human H295R cell line. Some analogs also showed high selectivity against other CYP enzymes such as 3A4, 1A2, 2C9, 2C19 and 2D6, which may limit side effects due to drug-drug interactions. Among these analogs, the most potent compound 9c showed 1.5 fold more potent against rat and human CYP17 protein than that of abiraterone (IC50 = 16 nM and 20 nM vs. 25 nM and 36 nM respectively). In NCI-H295R cells, the inhibitory effect of compound 9c on testosterone production (52± 2%) was also more potent than that of abiraterone (74± 15%) at the concentration of 1 μM. Further, it was shown that 9c reduced plasma testosterone level in a dose-dependent manner in Sprague-Dawley rats. Thus, analog 9c maybe a potential agent used for the treatment of prostate cancer. DOI : 10.1016/j.ejmech.2017.03.037
CHLOROQUINE
Inhibition of CYP2C19 in human liver microsomes assessed as metabolite produced at 1 uM by LC-MS/MS analysis relative to control
Liver
Inhibition = 113.0 %
Reference
Title : Development of a new generation of 4-aminoquinoline antimalarial compounds using predictive pharmacokinetic and toxicology models. Authors : Ray S, Madrid PB, Catz P, LeValley SE, Furniss MJ, Rausch LL, Guy RK, DeRisi JL, Iyer LV, Green CE, Mirsalis JC. Publication Year :
2010 Journal : J. Med. Chem. Abstract : Among the known antimalarial drugs, chloroquine (CQ) and other 4-aminoquinolines have shown high potency and good bioavailability. Yet complications associated with drug resistance necessitate the discovery of effective new antimalarial agents. ADMET prediction studies were employed to evaluate a library of new molecules based on the 4-aminoquinolone-related structure of CQ. Extensive in vitro screening and in vivo pharmacokinetic studies in mice helped to identify two lead molecules, 18 and 4, with promising in vitro therapeutic efficacy, improved ADMET properties, low risk for drug-drug interactions, and desirable pharmacokinetic profiles. Both 18 and 4 are highly potent antimalarial compounds, with IC(50) values of 5.6 and 17.3 nM, respectively, against the W2 (CQ-resistant) strain of Plasmodium falciparum (for CQ, IC(50) = 382 nM). When tested in mice, these compounds were found to have biological half-lives and plasma exposure values similar to or higher than those of CQ; they are therefore desirable candidates to pursue in future clinical trials. DOI : 10.1021/jm100057h
CHLOROQUINE
Inhibition of CYP2C19 in human liver microsomes assessed as metabolite produced at 10 uM by LC-MS/MS analysis relative to control
Liver
Inhibition = 111.0 %
Reference
Title : Development of a new generation of 4-aminoquinoline antimalarial compounds using predictive pharmacokinetic and toxicology models. Authors : Ray S, Madrid PB, Catz P, LeValley SE, Furniss MJ, Rausch LL, Guy RK, DeRisi JL, Iyer LV, Green CE, Mirsalis JC. Publication Year :
2010 Journal : J. Med. Chem. Abstract : Among the known antimalarial drugs, chloroquine (CQ) and other 4-aminoquinolines have shown high potency and good bioavailability. Yet complications associated with drug resistance necessitate the discovery of effective new antimalarial agents. ADMET prediction studies were employed to evaluate a library of new molecules based on the 4-aminoquinolone-related structure of CQ. Extensive in vitro screening and in vivo pharmacokinetic studies in mice helped to identify two lead molecules, 18 and 4, with promising in vitro therapeutic efficacy, improved ADMET properties, low risk for drug-drug interactions, and desirable pharmacokinetic profiles. Both 18 and 4 are highly potent antimalarial compounds, with IC(50) values of 5.6 and 17.3 nM, respectively, against the W2 (CQ-resistant) strain of Plasmodium falciparum (for CQ, IC(50) = 382 nM). When tested in mice, these compounds were found to have biological half-lives and plasma exposure values similar to or higher than those of CQ; they are therefore desirable candidates to pursue in future clinical trials. DOI : 10.1021/jm100057h
CLOPIDOGREL
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition = 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PIOGLITAZONE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ZOMEPIRAC
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DORAMAPIMOD
Inhibition of CYP2C19 (unknown origin) at 30 uM
—
Inhibition = 35.0 %
Reference
Title : Discovery of Narrow Spectrum Kinase Inhibitors: New Therapeutic Agents for the Treatment of COPD and Steroid-Resistant Asthma. Authors : Onions ST, Ito K, Charron CE, Brown RJ, Colucci M, Frickel F, Hardy G, Joly K, King-Underwood J, Kizawa Y, Knowles I, Murray PJ, Novak A, Rani A, Rapeport G, Smith A, Strong P, Taddei DM, Williams JG. Publication Year :
2016 Journal : J. Med. Chem. Abstract : The discovery of a novel series of therapeutic agents that has been designed and optimized for treating chronic obstructive pulmonary disease is reported. The pharmacological strategy was based on the identification of compounds that inhibit a defined subset of kinase enzymes modulating inflammatory processes that would be effective against steroid refractory disease and exhibit a sustained duration of action after inhaled delivery. DOI : 10.1021/acs.jmedchem.5b01029
AMINOPYRINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PF-00562271
Inhibition of CYP2C19 (unknown origin) at 10 uM relative to control
—
Inhibition = 843.0 %
Reference
Title : Authors : Publication Year : Journal :
CHS-828
Inhibition of CYP2C19 in human liver microsomes using mephenytoin as substrate in presence of NADPH by LC-MS/MS analysis
Liver
IC50 = 630.0 nM
Reference
Title : Minimizing CYP2C9 Inhibition of Exposed-Pyridine NAMPT (Nicotinamide Phosphoribosyltransferase) Inhibitors. Authors : Zak M, Yuen PW, Liu X, Patel S, Sampath D, Oeh J, Liederer BM, Wang W, O'Brien T, Xiao Y, Skelton N, Hua R, Sodhi J, Wang Y, Zhang L, Zhao G, Zheng X, Ho YC, Bair KW, Dragovich PS. Publication Year :
2016 Journal : J Med Chem Abstract : NAMPT inhibitors may show potential as therapeutics for oncology. Throughout our NAMPT inhibitor program, we found that exposed pyridines or related heterocyclic systems in the left-hand portion of the inhibitors are necessary pharmacophores for potent cellular NAMPT inhibition. However, when combined with a benzyl group in the center of the inhibitors, such pyridine-like moieties also led to consistent and potent inhibition of CYP2C9. In an attempt to reduce CYP2C9 inhibition, a parallel synthesis approach was used to identify central benzyl group replacements with increased Fsp3. A spirocyclic central motif was thus discovered that was combined with left-hand pyridines (or pyridine-like systems) to provide cellularly potent NAMPT inhibitors with minimal CYP2C9 inhibition. Further optimization of potency and ADME properties led to the discovery of compound 68, a highly potent NAMPT inhibitor with outstanding efficacy in a mouse tumor xenograft model and lacking measurable CYP2C9 inhibition at the concentrations tested. DOI : 10.1021/acs.jmedchem.6b00697
ADL-5747
Inhibition of human CYP2C19 at 10 uM
—
Inhibition = 12.8 %
Reference
Title : Spirocyclic delta opioid receptor agonists for the treatment of pain: discovery of N,N-diethyl-3-hydroxy-4-(spiro[chromene-2,4'-piperidine]-4-yl) benzamide (ADL5747). Authors : Le Bourdonnec B, Windh RT, Leister LK, Zhou QJ, Ajello CW, Gu M, Chu GH, Tuthill PA, Barker WM, Koblish M, Wiant DD, Graczyk TM, Belanger S, Cassel JA, Feschenko MS, Brogdon BL, Smith SA, Derelanko MJ, Kutz S, Little PJ, DeHaven RN, DeHaven-Hudkins DL, Dolle RE. Publication Year :
2009 Journal : J. Med. Chem. Abstract : Selective, nonpeptidic delta opioid receptor agonists have been the subject of great interest as potential novel analgesic agents. The discoveries of BW373U86 (1) and SNC80 (2) contributed to the rapid expansion of research in this field. However, poor drug-like properties and low therapeutic indices have prevented clinical evaluation of these agents. Doses of 1 and 2 similar to those required for analgesic activity produce convulsions in rodents and nonhuman primates. Recently, we described a novel series of potent, selective, and orally bioavailable delta opioid receptor agonists. The lead derivative, ADL5859 (4), is currently in phase II proof-of-concept studies for the management of pain. Further structure activity relationship exploration has led to the discovery of ADL5747 (36), which is approximately 50-fold more potent than 4 in an animal model of inflammatory pain. On the basis of its favorable efficacy, safety, and pharmacokinetic profile, 36 was selected as a clinical candidate for the treatment of pain. DOI : 10.1021/jm900773n
ASTEMIZOLE
Inhibition of CYP2C19-mediated S-mephenytoin metabolite formation in human liver microsomes at 0.3 uM after 8 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 6.0 %
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
TACRINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BERGAPTEN
Inhibition of recombinant human CYP2C19 expressed in baker's yeast-derived microsomes (Sacchrosomes) at 10 uM using 3-cyano-7-ethoxycoumarin substrate by EROD assay relative to control
—
Inhibition = 5.0 %
Reference
Title : Identification of karanjin isolated from the Indian beech tree as a potent CYP1 enzyme inhibitor with cellular efficacy <i>via</i> screening of a natural product repository. Authors : Joshi P, Sonawane VR, Williams IS, McCann GJP, Gatchie L, Sharma R, Satti N, Chaudhuri B, Bharate SB. Publication Year :
2018 Journal : MedChemComm Abstract : CYP1A1 is thought to mediate carcinogenesis in oral, lung and epithelial cancers. In order to identify a CYP1A1 inhibitor from an edible plant, 394 natural products in the IIIM's natural product repository were screened, at 10 μM concentration, using CYP1A1-Sacchrosomes™ (<i>i.e.</i> microsomal enzyme isolated from recombinant baker's yeast). Twenty-seven natural products were identified that inhibited 40-97% of CYP1A1's 7-ethoxyresorufin-<i>O</i>-deethylase activity. The IC<sub>50</sub> values of the 'hits', belonging to different chemical scaffolds, were determined. Their selectivity was studied against a panel of 8 CYP-Sacchrosomes™. In order to assess cellular efficacy, the 'hits' were screened for their capability to inhibit CYP enzymes expressed within live recombinant human embryonic kidney (HEK293) cells from plasmids encoding specific CYP genes (1A2, 1B1, 2C9, 2C19, 2D6, 3A4). Isopimpinellin (IN-475; IC<sub>50</sub>, 20 nM) and karanjin (IN-195; IC<sub>50</sub>, 30 nM) showed the most potent inhibition of CYP1A1 in human cells. Isopimpinellin is found in celery, parsnip, fruits and in the rind and pulp of limes whereas different parts of the Indian beech tree, which contain karanjin, have been used in traditional medicine. Both isopimpinellin and karanjin negate the cellular toxicity of CYP1A1-mediated benzo[<i>a</i>]pyrene. Molecular docking and molecular dynamic simulations with CYP isoforms rationalize the observed trends in the potency and selectivity of isopimpinellin and karanjin. DOI : 10.1039/C7MD00388A
TICRYNAFEN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition = 35.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BEPRIDIL
Inhibition of CYP2C19 in human liver microsomes using S-mephenytoin as substrate after 8 mins by LC-MS/MS analysis
Liver
IC50 < 100.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
AZD-3759
Inhibition of CYP2C19 (unknown origin)
—
IC50 > 50.0 nM
Reference
Title : Discovery and Evaluation of Clinical Candidate AZD3759, a Potent, Oral Active, Central Nervous System-Penetrant, Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitor. Authors : Zeng Q, Wang J, Cheng Z, Chen K, Johnström P, Varnäs K, Li DY, Yang ZF, Zhang X. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Recent reports suggest that an increasing number of patients with lung cancer, especially those with activating mutations of the epidermal growth factor receptor (EGFR), also present with brain metastases and leptomeningeal metastases. These patients have poor prognosis as there are no approved drugs for these indications. Available agents have poor efficacy for these patients even at well above their standard dose. Herein, we report the discovery of (4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl (2R)-2,4-dimethylpiperazine-1-carboxylate 1m (AZD3759), an investigational drug currently in Phase 1 clinical trial, which has excellent central nervous system penetration and which induces profound regression of brain metastases in a mouse model. DOI : 10.1021/acs.jmedchem.5b01073
VACTOSERTIB
Inhibition of CYP2C19 in human liver microsomes using S-mephenytoin as substrate at 10 uM incubated for 5 mins prior to substrate addition measured after 10 mins by LC/MS/MS analysis
Liver
Inhibition = 30.7 %
Reference
Title : Discovery of N-((4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-5-(6-methylpyridin-2-yl)-1H-imidazol-2-yl)methyl)-2-fluoroaniline (EW-7197): a highly potent, selective, and orally bioavailable inhibitor of TGF-β type I receptor kinase as cancer immunotherapeutic/antifibrotic agent. Authors : Jin CH, Krishnaiah M, Sreenu D, Subrahmanyam VB, Rao KS, Lee HJ, Park SJ, Park HJ, Lee K, Sheen YY, Kim DK. Publication Year :
2014 Journal : J. Med. Chem. Abstract : A series of 2-substituted-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-5-(6-methylpyridin-2-yl)imidazoles was synthesized and evaluated to optimize a prototype inhibitor of TGF-β type I receptor kinase (ALK5), 6. Combination of replacement of a quinoxalin-6-yl moiety of 6 with a [1,2,4]triazolo[1,5-a]pyridin-6-yl moiety, insertion of a methyleneamino linker, and a o-F substituent in the phenyl ring markedly increased ALK5 inhibitory activity, kinase selectivity, and oral bioavailability. The 12b (EW-7197) inhibited ALK5 with IC50 value of 0.013 μM in a kinase assay and with IC50 values of 0.0165 and 0.0121 μM in HaCaT (3TP-luc) stable cells and 4T1 (3TP-luc) stable cells, respectively, in a luciferase assay. Selectivity profiling of 12b using a panel of 320 protein kinases revealed that it is a highly selective ALK5/ALK4 inhibitor. Pharmacokinetic study with 12b·HCl in rats showed an oral bioavailability of 51% with high systemic exposure (AUC) of 1426 ng × h/mL and maximum plasma concentration (Cmax) of 1620 ng/mL. Rational optimization of 6 has led to the identification of a highly potent, selective, and orally bioavailable ALK5 inhibitor 12b. DOI : 10.1021/jm500115w
INDOMETHACIN
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PLUMBAGIN
Inhibition of recombinant human CYP2C19 expressed in baker's yeast-derived microsomes (Sacchrosomes) at 10 uM using 3-cyano-7-ethoxycoumarin substrate by EROD assay relative to control
—
Inhibition = 12.0 %
Reference
Title : Identification of karanjin isolated from the Indian beech tree as a potent CYP1 enzyme inhibitor with cellular efficacy <i>via</i> screening of a natural product repository. Authors : Joshi P, Sonawane VR, Williams IS, McCann GJP, Gatchie L, Sharma R, Satti N, Chaudhuri B, Bharate SB. Publication Year :
2018 Journal : MedChemComm Abstract : CYP1A1 is thought to mediate carcinogenesis in oral, lung and epithelial cancers. In order to identify a CYP1A1 inhibitor from an edible plant, 394 natural products in the IIIM's natural product repository were screened, at 10 μM concentration, using CYP1A1-Sacchrosomes™ (<i>i.e.</i> microsomal enzyme isolated from recombinant baker's yeast). Twenty-seven natural products were identified that inhibited 40-97% of CYP1A1's 7-ethoxyresorufin-<i>O</i>-deethylase activity. The IC<sub>50</sub> values of the 'hits', belonging to different chemical scaffolds, were determined. Their selectivity was studied against a panel of 8 CYP-Sacchrosomes™. In order to assess cellular efficacy, the 'hits' were screened for their capability to inhibit CYP enzymes expressed within live recombinant human embryonic kidney (HEK293) cells from plasmids encoding specific CYP genes (1A2, 1B1, 2C9, 2C19, 2D6, 3A4). Isopimpinellin (IN-475; IC<sub>50</sub>, 20 nM) and karanjin (IN-195; IC<sub>50</sub>, 30 nM) showed the most potent inhibition of CYP1A1 in human cells. Isopimpinellin is found in celery, parsnip, fruits and in the rind and pulp of limes whereas different parts of the Indian beech tree, which contain karanjin, have been used in traditional medicine. Both isopimpinellin and karanjin negate the cellular toxicity of CYP1A1-mediated benzo[<i>a</i>]pyrene. Molecular docking and molecular dynamic simulations with CYP isoforms rationalize the observed trends in the potency and selectivity of isopimpinellin and karanjin. DOI : 10.1039/C7MD00388A
MAVORIXAFOR
Inhibition of human CYP2C19 at 1 uM
—
Inhibition = 20.0 %
Reference
Title : Discovery of novel N-aryl piperazine CXCR4 antagonists. Authors : Zhao H, Prosser AR, Liotta DC, Wilson LJ. Publication Year :
2015 Journal : Bioorg. Med. Chem. Lett. Abstract : A novel series of CXCR4 antagonists with substituted piperazines as benzimidazole replacements is described. These compounds showed micromolar to nanomolar potency in CXCR4-mediated functional and HIV assays, namely inhibition of X4 HIV-1(IIIB) virus in MAGI-CCR5/CXCR4 cells and inhibition of SDF-1 induced calcium release in Chem-1 cells. Preliminary SAR investigations led to the identification of a series of N-aryl piperazines as the most potent compounds. Results show SAR that indicates type and position of the aromatic ring, as well as type of linker and stereochemistry are significant for activity. Profiling of several lead compounds showed that one (49b) reduced susceptibility towards CYP450 and hERG, and the best overall profile when considering both SDF-1 and HIV potencies (6-20 nM). DOI : 10.1016/j.bmcl.2015.04.036
EXEMESTANE
Drug metabolism assessed as human recombinant CYP2C19-mediated 17-hydroexemestane and 6-Hydroxymethylexemestane formation assessed as inhibition of metabolite formation at 10 uM after 10 mins by Michaelis-Menten saturation curve analysis in presence of 5 uM ticlopidine
—
Inhibition < 20.0 %
Reference
Title : In vitro cytochrome P450-mediated metabolism of exemestane. Authors : Kamdem LK, Flockhart DA, Desta Z. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Exemestane is a potent and irreversible steroidal aromatase inhibitor drug used for the treatment of estrogen receptor-positive breast cancer. Our aim was to identify and assess the contribution of the specific cytochromes P450 (P450s) responsible for exemestane primary in vitro metabolism. With the use of high-performance liquid chromatography and liquid chromatography-tandem mass spectrometry analytical techniques, 17-hydroexemestane (MI) formation and 6-hydroxymethylexemestane (MII) formation were found to be the predominant exemestane metabolic pathways. In a bank of 15 well characterized human liver microsomes with known P450 isoform-specific activities, the MI formation rate correlated significantly with CYP1A2 (Spearman r = 0.60, p = 0.02) and CYP4A11 (Spearman r = 0.67, p = 0.01) isoform-specific activities, whereas the MII production rate significantly correlated with CYP2B6 (Spearman r = 0.57, p = 0.03) and CYP3A (Spearman r = 0.76, p = 0.005) isoform-specific activities. Recombinant CYP1A1 metabolized exemestane to MI with a catalytic efficiency (Cl(int)) of 150 nl/pmol P450 × min that was at least 3.5-fold higher than those of other P450s investigated. Recombinant CYP3A4 catalyzed MII formation from exemestane with a catalytic efficiency of 840 nl/pmol P450 × min that was at least 4-fold higher than those of other P450s investigated. Among a panel of 10 chemical inhibitors tested, only ketoconazole and troleandomycin (CYP3A-specific chemical inhibitors) significantly inhibited the formation of MII by 45 and 95%, respectively. None of them markedly inhibited the formation of MI. In summary, exemestane seems to be metabolized to MI by multiple P450s that include CYP4A11 and CYP1A1/2, whereas its oxidation to MII is primarily mediated by CYP3A. DOI : 10.1124/dmd.110.032276
NEVIRAPINE
Time dependent inhibition of CYP2C19 in human liver microsomes at 100 uM by LC/MS system
Liver
Inhibition = 12.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
OLVEREMBATINIB
Inhibition of human recombinant CYP2C19 after 30 mins
—
IC50 = 990.0 nM
Reference
Title : Identification of GZD824 as an orally bioavailable inhibitor that targets phosphorylated and nonphosphorylated breakpoint cluster region-Abelson (Bcr-Abl) kinase and overcomes clinically acquired mutation-induced resistance against imatinib. Authors : Ren X, Pan X, Zhang Z, Wang D, Lu X, Li Y, Wen D, Long H, Luo J, Feng Y, Zhuang X, Zhang F, Liu J, Leng F, Lang X, Bai Y, She M, Tu Z, Pan J, Ding K, Ding K. Publication Year :
2013 Journal : J. Med. Chem. Abstract : Bcr-Abl(T315I) mutation-induced imatinib resistance remains a major challenge for clinical management of chronic myelogenous leukemia (CML). Herein, we report GZD824 (10a) as a novel orally bioavailable inhibitor against a broad spectrum of Bcr-Abl mutants including T315I. It tightly bound to Bcr-Abl(WT) and Bcr-Abl(T315I) with K(d) values of 0.32 and 0.71 nM, respectively, and strongly inhibited the kinase functions with nanomolar IC(50) values. The compound potently suppressed proliferation of Bcr-Abl-positive K562 and Ku812 human CML cells with IC(50) values of 0.2 and 0.13 nM, respectively. It also displayed good oral bioavailability (48.7%), a reasonable half-life (10.6 h), and promising in vivo antitumor efficacy. It induced tumor regression in mouse xenograft tumor models driven by Bcr-Abl(WT) or the mutants and significantly improved the survival of mice bearing an allograft leukemia model with Ba/F3 cells harboring Bcr-Abl(T315I). GZD824 represents a promising lead candidate for development of Bcr-Abl inhibitors to overcome acquired imatinib resistance. DOI : 10.1021/jm301581y
Title : Evaluation of inhibition selectivity for human cytochrome P450 2A enzymes. Authors : Stephens ES, Walsh AA, Scott EE. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (P450) enzymes are mixed-function oxidases that catalyze the metabolism of xenobiotics and endogenous biochemicals. Selective inhibitors are needed to accurately distinguish the contributions of individual P450 enzymes in the metabolism of drugs and the activation of procarcinogens in human tissues, but very frequently these enzymes have substantial overlapping selectivity. We evaluated a chemically diverse set of nine previously identified CYP2A6 inhibitors to determine which are able to discriminate between human CYP2A enzymes CYP2A6 and the 94%-identical CYP2A13 enzyme. Inhibitor binding to recombinant purified enzyme was evaluated, and affinities were determined. K(i) values were determined for inhibition of p-nitrophenol 2-hydroxylation, a reaction accomplished by CYP2A13 and CYP2A6 with more similar catalytic efficiencies (k(cat)/K(m) 0.19 and 0.12 μM⁻¹ · min⁻¹, respectively) than hydroxylation of the classic substrate coumarin (0.11 and 0.53 μM⁻¹ · min⁻¹, respectively). Of the nine compounds assayed, only tranylcypromine and (R)-(+)-menthofuran had a greater than 10-fold preference for CYP2A6 inhibition versus CYP2A13 inhibition. Most compounds evaluated [tryptamine, 4-dimethylaminobenzaldehyde, phenethyl isothiocyanate, β-nicotyrine, (S)-nicotine, and pilocarpine] demonstrated only moderate or no preference for inhibition of one CYP2A enzyme over the other. However, 8-methoxypsoralen has a 6-fold lower K(i) for CYP2A13 than for CYP2A6. This information is useful to inform reinterpretation of previous data with these inhibitors and to guide future studies seeking to determine which human CYP2A enzyme is responsible for the in vivo metabolism of compounds in human tissues expressing both enzymes. DOI : 10.1124/dmd.112.045161
Mechanism based inhibition of human cytochrome P450 2A6 measured by coumarin 7-hydroxylation using a recombinant system
—
Ki = 800.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
METHOXSALEN
Mixed inhibition of CYP2A6 (unknown origin)
—
Ki = 250.0 nM
Reference
Title : Evaluation of inhibition selectivity for human cytochrome P450 2A enzymes. Authors : Stephens ES, Walsh AA, Scott EE. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (P450) enzymes are mixed-function oxidases that catalyze the metabolism of xenobiotics and endogenous biochemicals. Selective inhibitors are needed to accurately distinguish the contributions of individual P450 enzymes in the metabolism of drugs and the activation of procarcinogens in human tissues, but very frequently these enzymes have substantial overlapping selectivity. We evaluated a chemically diverse set of nine previously identified CYP2A6 inhibitors to determine which are able to discriminate between human CYP2A enzymes CYP2A6 and the 94%-identical CYP2A13 enzyme. Inhibitor binding to recombinant purified enzyme was evaluated, and affinities were determined. K(i) values were determined for inhibition of p-nitrophenol 2-hydroxylation, a reaction accomplished by CYP2A13 and CYP2A6 with more similar catalytic efficiencies (k(cat)/K(m) 0.19 and 0.12 μM⁻¹ · min⁻¹, respectively) than hydroxylation of the classic substrate coumarin (0.11 and 0.53 μM⁻¹ · min⁻¹, respectively). Of the nine compounds assayed, only tranylcypromine and (R)-(+)-menthofuran had a greater than 10-fold preference for CYP2A6 inhibition versus CYP2A13 inhibition. Most compounds evaluated [tryptamine, 4-dimethylaminobenzaldehyde, phenethyl isothiocyanate, β-nicotyrine, (S)-nicotine, and pilocarpine] demonstrated only moderate or no preference for inhibition of one CYP2A enzyme over the other. However, 8-methoxypsoralen has a 6-fold lower K(i) for CYP2A13 than for CYP2A6. This information is useful to inform reinterpretation of previous data with these inhibitors and to guide future studies seeking to determine which human CYP2A enzyme is responsible for the in vivo metabolism of compounds in human tissues expressing both enzymes. DOI : 10.1124/dmd.112.045161
VORICONAZOLE
Inhibition of CYP2A6 in human liver microsomes assessed as coumarin 7-hydroxylation at 100 uM after 15 mins
Liver
Inhibition = 25.0 %
Reference
Title : Comprehensive in vitro analysis of voriconazole inhibition of eight cytochrome P450 (CYP) enzymes: major effect on CYPs 2B6, 2C9, 2C19, and 3A. Authors : Jeong S, Nguyen PD, Desta Z. Publication Year :
2009 Journal : Antimicrob. Agents Chemother. Abstract : Voriconazole is an effective antifungal drug, but adverse drug-drug interactions associated with its use are of major clinical concern. To identify the mechanisms of these interactions, we tested the inhibitory potency of voriconazole with eight human cytochrome P450 (CYP) enzymes. Isoform-specific probes were incubated with human liver microsomes (HLMs) (or expressed CYPs) and cofactors in the absence and the presence of voriconazole. Preincubation experiments were performed to test mechanism-based inactivation. In pilot experiments, voriconazole showed inhibition of CYP2B6, CYP2C9, CYP2C19, and CYP3A (half-maximal [50%] inhibitory concentrations, <6 microM); its effect on CYP1A2, CYP2A6, CYP2C8, and CYP2D6 was marginal (<25% inhibition at 100 microM voriconazole). Further detailed experiments with HLMs showed that voriconazole is a potent competitive inhibitor of CYP2B6 (K(i) < 0.5), CYP2C9 (K(i) = 2.79 microM), and CYP2C19 (K(i) = 5.1 microM). The inhibition of CYP3A by voriconazole was explained by noncompetitive (K(i) = 2.97 microM) and competitive (K(i) = 0.66 microM) modes of inhibition. Prediction of the in vivo interaction of voriconazole from these in vitro data suggests that voriconazole would substantially increase the exposure of drugs metabolized by CYP2B6, CYP2C9, CYP2C19, and CYP3A. Clinicians should be aware of these interactions and monitor patients for adverse effects or failure of therapy. DOI : 10.1128/aac.01123-08
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 39 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = -2.1 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 37 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 2.6 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 20 uM SPP100 on 37 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 2.6 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 37 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 2.6 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 37 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 2.6 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 uM SPP100 on 34 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 10.5 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
PSORALEN
Mechanism based inhibition of human cytochrome P450 2A6 measured by coumarin 7-hydroxylation
—
Ki = 600.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
TRANYLCYPROMINE
Inhibitory activity of 100 uM tranylcypromine on 1.2 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 97.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
TRANYLCYPROMINE
Inhibitory activity of 100 uM tranylcypromine on 0.6 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 98.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
TRANYLCYPROMINE
Inhibitory activity of 100 uM tranylcypromine on 0.3 Pmoles of cDNA-derived CYP2A6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 99.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
TRANYLCYPROMINE
Mixed inhibition of CYP2A6 (unknown origin)
—
Ki = 130.0 nM
Reference
Title : Evaluation of inhibition selectivity for human cytochrome P450 2A enzymes. Authors : Stephens ES, Walsh AA, Scott EE. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (P450) enzymes are mixed-function oxidases that catalyze the metabolism of xenobiotics and endogenous biochemicals. Selective inhibitors are needed to accurately distinguish the contributions of individual P450 enzymes in the metabolism of drugs and the activation of procarcinogens in human tissues, but very frequently these enzymes have substantial overlapping selectivity. We evaluated a chemically diverse set of nine previously identified CYP2A6 inhibitors to determine which are able to discriminate between human CYP2A enzymes CYP2A6 and the 94%-identical CYP2A13 enzyme. Inhibitor binding to recombinant purified enzyme was evaluated, and affinities were determined. K(i) values were determined for inhibition of p-nitrophenol 2-hydroxylation, a reaction accomplished by CYP2A13 and CYP2A6 with more similar catalytic efficiencies (k(cat)/K(m) 0.19 and 0.12 μM⁻¹ · min⁻¹, respectively) than hydroxylation of the classic substrate coumarin (0.11 and 0.53 μM⁻¹ · min⁻¹, respectively). Of the nine compounds assayed, only tranylcypromine and (R)-(+)-menthofuran had a greater than 10-fold preference for CYP2A6 inhibition versus CYP2A13 inhibition. Most compounds evaluated [tryptamine, 4-dimethylaminobenzaldehyde, phenethyl isothiocyanate, β-nicotyrine, (S)-nicotine, and pilocarpine] demonstrated only moderate or no preference for inhibition of one CYP2A enzyme over the other. However, 8-methoxypsoralen has a 6-fold lower K(i) for CYP2A13 than for CYP2A6. This information is useful to inform reinterpretation of previous data with these inhibitors and to guide future studies seeking to determine which human CYP2A enzyme is responsible for the in vivo metabolism of compounds in human tissues expressing both enzymes. DOI : 10.1124/dmd.112.045161
COUMARIN
Inhibition of human CYP2A6 at 10 uM
—
Inhibition = 98.19 %
Reference
Title : Novel Pyrrolopyridone Bromodomain and Extra-Terminal Motif (BET) Inhibitors Effective in Endocrine-Resistant ER+ Breast Cancer with Acquired Resistance to Fulvestrant and Palbociclib. Authors : Li Y, Zhao J, Gutgesell LM, Shen Z, Ratia K, Dye K, Dubrovskyi O, Zhao H, Huang F, Tonetti DA, Thatcher GRJ, Xiong R. Publication Year :
2020 Journal : J Med Chem Abstract : Acquired resistance to fulvestrant and palbociclib is a new challenge to treatment of estrogen receptor positive (ER+) breast cancer. ER is expressed in most resistance settings; thus, bromodomain and extra-terminal protein inhibitors (BETi) that target BET-amplified ER-mediated transcription have therapeutic potential. Novel pyrrolopyridone BETi leveraged novel interactions with L92/L94 confirmed by a cocrystal structure of 27 with BRD4. Optimization of BETi using growth inhibition in fulvestrant-resistant (MCF-7:CFR) cells was confirmed in endocrine-resistant, palbociclib-resistant, and ESR1 mutant cell lines. 27 was more potent in MCF-7:CFR cells than six BET inhibitors in clinical trials. Transcriptomic analysis differentiated 27 from the benchmark BETi, JQ-1, showing downregulation of oncogenes and upregulation of tumor suppressors and apoptosis. The therapeutic approach was validated by oral administration of 27 in orthotopic xenografts of endocrine-resistant breast cancer in monotherapy and in combination with fulvestrant. Importantly, at an equivalent dose in rats, thrombocytopenia was mitigated. DOI : 10.1021/acs.jmedchem.0c00456
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CANNABIDIOL
Mixed type inhibition of human recombinant CYP2B6 expressed in baculovirus-infected insect cells using coumarin as substrate preincubated for 5 mins followed by NADPH-generating system addition by Lineweaver-Burk plot analysis
—
Ki = 690.0 nM
Reference
Title : The Essential Medicinal Chemistry of Cannabidiol (CBD). Authors : Nelson KM,Bisson J,Singh G,Graham JG,Chen SN,Friesen JB,Dahlin JL,Niemitz M,Walters MA,Pauli GF Publication Year :
2020 Journal : J Med Chem Abstract : This Perspective of the published essential medicinal chemistry of cannabidiol (CBD) provides evidence that the popularization of CBD-fortified or CBD-labeled health products and CBD-associated health claims lacks a rigorous scientific foundation. CBD's reputation as a cure-all puts it in the same class as other "natural" panaceas, where valid ethnobotanicals are reduced to single, purportedly active ingredients. Such reductionist approaches oversimplify useful, chemically complex mixtures in an attempt to rationalize the commercial utility of natural compounds and exploit the "natural" label. Literature evidence associates CBD with certain semiubiquitous, broadly screened, primarily plant-based substances of undocumented purity that interfere with bioassays and have a low likelihood of becoming therapeutic agents. Widespread health challenges and pandemic crises such as SARS-CoV-2 create circumstances under which scientists must be particularly vigilant about healing claims that lack solid foundational data. Herein, we offer a critical review of the published medicinal chemistry properties of CBD, as well as precise definitions of CBD-containing substances and products, distilled to reveal the essential factors that impact its development as a therapeutic agent. DOI : 10.1021/acs.jmedchem.0c00724
CARBAMAZEPINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CELECOXIB
Time dependent inhibition of CYP2B6 (unknown origin) at 30 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CLOZAPINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DICLOFENAC
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DOLUTEGRAVIR
Inhibition of CYP2B6 in human liver microsomes using bupropion as substrate at 100 uM preincubated for 20 mins with substrate prior to initiation of reaction with NADPH by HPLC analysis
Liver
Inhibition = 20.0 %
Reference
Title : In vitro investigations into the roles of drug transporters and metabolizing enzymes in the disposition and drug interactions of dolutegravir, a HIV integrase inhibitor. Authors : Reese MJ, Savina PM, Generaux GT, Tracey H, Humphreys JE, Kanaoka E, Webster LO, Harmon KA, Clarke JD, Polli JW. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Dolutegravir (DTG; S/GSK1349572) is a potent HIV-1 integrase inhibitor with a distinct resistance profile and a once-daily dose regimen that does not require pharmacokinetic boosting. This work investigated the in vitro drug transport and metabolism of DTG and assessed the potential for clinical drug-drug interactions. DTG is a substrate for the efflux transporters P-glycoprotein (Pgp) and human breast cancer resistance protein (BCRP). Its high intrinsic membrane permeability limits the impact these transporters have on DTG's intestinal absorption. UDP-glucuronosyltransferase (UGT) 1A1 is the main enzyme responsible for the metabolism of DTG in vivo, with cytochrome P450 (P450) 3A4 being a notable pathway and UGT1A3 and UGT1A9 being only minor pathways. DTG demonstrated little or no inhibition (IC(50) values > 30 μM) in vitro of the transporters Pgp, BCRP, multidrug resistance protein 2, organic anion transporting polypeptide 1B1/3, organic cation transporter (OCT) 1, or the drug metabolizing enzymes CYP1A2, 2A6, 2B6, 2C8, 2C9, 2C19, 2D6, 3A4, UGT1A1, or 2B7. Further, DTG did not induce CYP1A2, 2B6, or 3A4 mRNA in vitro using human hepatocytes. DTG does inhibit the renal OCT2 (IC(50) = 1.9 μM) transporter, which provides a mechanistic basis for the mild increases in serum creatinine observed in clinical studies. These in vitro studies demonstrate a low propensity for DTG to be a perpetrator of clinical drug interactions and provide a basis for predicting when other drugs could result in a drug interaction with DTG. DOI : 10.1124/dmd.112.048918
EFAVIRENZ
Inhibition of CYP2B6 (unknown origin) assessed as reduction in hydroxybupropion formation at 10 uM incubated for 10 mins by uHPLC-MS/MS method
—
Inhibition = 95.0 %
Reference
Title : Structure-Activity Studies Reveal the Oxazinone Ring Is a Determinant of Cytochrome P450 2B6 Activity Toward Efavirenz. Authors : Cox PM, Bumpus NN. Publication Year :
2014 Journal : ACS Med. Chem. Lett. Abstract : Cytochrome P450 2B6 (CYP2B6) is primarily responsible for the metabolism of the anti-HIV drug efavirenz (EFV). We set out to explore the molecular basis for CYP2B6 activity toward EFV by examining the metabolism of eight EFV analogues. cDNA-expressed CYP2B6 formed monooxygenated metabolites from EFV analogues containing an intact oxazinone or oxazine ring, but not from analogues with a disrupted ring, suggesting this ring is important for metabolism of EFV by CYP2B6. Subsequent substrate depletion analysis of EFV and EFV analogues found to be CYP2B6 substrates revealed further differences between these CYP2B6 substrates. Compounds that were not found to be CYP2B6 substrates were still able to inhibit CYP2B6 activity toward a known substrate, bupropion, suggesting they do gain access to the CYP2B6 active site. Taken together, these data reveal structural characteristics of EFV, namely, the oxazinone ring, that are critical for CYP2B6 metabolism of compounds with the EFV chemical scaffold. DOI : 10.1021/ml500297n
ERYTHROMYCIN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ETHINYL ESTRADIOL
Time dependent inhibition of CYP2B6 (unknown origin) at 30 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ETHINYL ESTRADIOL
Mechanism based inhibition of human cytochrome P450 2B6 measured by 7-EFC O-deethylation
—
Ki = 800.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
ETHINYL ESTRADIOL
Mechanism based inhibition of human cytochrome P450 2B6 measured by 7-EFC O-deethylation
—
Ki = 900.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
FLUTAMIDE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FUROSEMIDE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
LEVOFLOXACIN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
OLANZAPINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PHENYTOIN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
RITONAVIR
Time dependent inhibition of CYP2B6 (unknown origin) at 0.3 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
SULFAMETHOXAZOLE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VALPROIC ACID
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VALSARTAN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VORICONAZOLE
Inhibition of CYP2B6 in human liver microsomes assessed as 8-hydroxyefavirenz 14-hydroxylation after 10 mins
Liver
IC50 = 790.0 nM
Reference
Title : Comprehensive in vitro analysis of voriconazole inhibition of eight cytochrome P450 (CYP) enzymes: major effect on CYPs 2B6, 2C9, 2C19, and 3A. Authors : Jeong S, Nguyen PD, Desta Z. Publication Year :
2009 Journal : Antimicrob. Agents Chemother. Abstract : Voriconazole is an effective antifungal drug, but adverse drug-drug interactions associated with its use are of major clinical concern. To identify the mechanisms of these interactions, we tested the inhibitory potency of voriconazole with eight human cytochrome P450 (CYP) enzymes. Isoform-specific probes were incubated with human liver microsomes (HLMs) (or expressed CYPs) and cofactors in the absence and the presence of voriconazole. Preincubation experiments were performed to test mechanism-based inactivation. In pilot experiments, voriconazole showed inhibition of CYP2B6, CYP2C9, CYP2C19, and CYP3A (half-maximal [50%] inhibitory concentrations, <6 microM); its effect on CYP1A2, CYP2A6, CYP2C8, and CYP2D6 was marginal (<25% inhibition at 100 microM voriconazole). Further detailed experiments with HLMs showed that voriconazole is a potent competitive inhibitor of CYP2B6 (K(i) < 0.5), CYP2C9 (K(i) = 2.79 microM), and CYP2C19 (K(i) = 5.1 microM). The inhibition of CYP3A by voriconazole was explained by noncompetitive (K(i) = 2.97 microM) and competitive (K(i) = 0.66 microM) modes of inhibition. Prediction of the in vivo interaction of voriconazole from these in vitro data suggests that voriconazole would substantially increase the exposure of drugs metabolized by CYP2B6, CYP2C9, CYP2C19, and CYP3A. Clinicians should be aware of these interactions and monitor patients for adverse effects or failure of therapy. DOI : 10.1128/aac.01123-08
VORICONAZOLE
Inhibition of CYP2B6 in human liver microsomes assessed as efavirenz 8-hydroxylation after 10 mins by Dixon plot analysis
Liver
Ki = 400.0 nM
Reference
Title : Comprehensive in vitro analysis of voriconazole inhibition of eight cytochrome P450 (CYP) enzymes: major effect on CYPs 2B6, 2C9, 2C19, and 3A. Authors : Jeong S, Nguyen PD, Desta Z. Publication Year :
2009 Journal : Antimicrob. Agents Chemother. Abstract : Voriconazole is an effective antifungal drug, but adverse drug-drug interactions associated with its use are of major clinical concern. To identify the mechanisms of these interactions, we tested the inhibitory potency of voriconazole with eight human cytochrome P450 (CYP) enzymes. Isoform-specific probes were incubated with human liver microsomes (HLMs) (or expressed CYPs) and cofactors in the absence and the presence of voriconazole. Preincubation experiments were performed to test mechanism-based inactivation. In pilot experiments, voriconazole showed inhibition of CYP2B6, CYP2C9, CYP2C19, and CYP3A (half-maximal [50%] inhibitory concentrations, <6 microM); its effect on CYP1A2, CYP2A6, CYP2C8, and CYP2D6 was marginal (<25% inhibition at 100 microM voriconazole). Further detailed experiments with HLMs showed that voriconazole is a potent competitive inhibitor of CYP2B6 (K(i) < 0.5), CYP2C9 (K(i) = 2.79 microM), and CYP2C19 (K(i) = 5.1 microM). The inhibition of CYP3A by voriconazole was explained by noncompetitive (K(i) = 2.97 microM) and competitive (K(i) = 0.66 microM) modes of inhibition. Prediction of the in vivo interaction of voriconazole from these in vitro data suggests that voriconazole would substantially increase the exposure of drugs metabolized by CYP2B6, CYP2C9, CYP2C19, and CYP3A. Clinicians should be aware of these interactions and monitor patients for adverse effects or failure of therapy. DOI : 10.1128/aac.01123-08
VORICONAZOLE
Inhibition of CYP2B6 in human liver microsomes assessed as bupropion 4-hydroxylation after 15 mins by Dixon plot analysis
Liver
Ki = 340.0 nM
Reference
Title : Comprehensive in vitro analysis of voriconazole inhibition of eight cytochrome P450 (CYP) enzymes: major effect on CYPs 2B6, 2C9, 2C19, and 3A. Authors : Jeong S, Nguyen PD, Desta Z. Publication Year :
2009 Journal : Antimicrob. Agents Chemother. Abstract : Voriconazole is an effective antifungal drug, but adverse drug-drug interactions associated with its use are of major clinical concern. To identify the mechanisms of these interactions, we tested the inhibitory potency of voriconazole with eight human cytochrome P450 (CYP) enzymes. Isoform-specific probes were incubated with human liver microsomes (HLMs) (or expressed CYPs) and cofactors in the absence and the presence of voriconazole. Preincubation experiments were performed to test mechanism-based inactivation. In pilot experiments, voriconazole showed inhibition of CYP2B6, CYP2C9, CYP2C19, and CYP3A (half-maximal [50%] inhibitory concentrations, <6 microM); its effect on CYP1A2, CYP2A6, CYP2C8, and CYP2D6 was marginal (<25% inhibition at 100 microM voriconazole). Further detailed experiments with HLMs showed that voriconazole is a potent competitive inhibitor of CYP2B6 (K(i) < 0.5), CYP2C9 (K(i) = 2.79 microM), and CYP2C19 (K(i) = 5.1 microM). The inhibition of CYP3A by voriconazole was explained by noncompetitive (K(i) = 2.97 microM) and competitive (K(i) = 0.66 microM) modes of inhibition. Prediction of the in vivo interaction of voriconazole from these in vitro data suggests that voriconazole would substantially increase the exposure of drugs metabolized by CYP2B6, CYP2C9, CYP2C19, and CYP3A. Clinicians should be aware of these interactions and monitor patients for adverse effects or failure of therapy. DOI : 10.1128/aac.01123-08
ZAFIRLUKAST
Time dependent inhibition of CYP2B6 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMLODIPINE
Time dependent inhibition of CYP2B6 (unknown origin) at 3 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMODIAQUINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ATORVASTATIN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BENZBROMARONE
Time dependent inhibition of CYP2B6 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CAFFEINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DONEPEZIL
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FLUOXETINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
METHADONE
Inactivation of C-terminal His4-tagged human CYP2B6 lacking 21 N-terminal residues assessed as decrease in enzyme catalytic activity at 100 uM for 15 mins by spectral analysis in presence of NADPH
—
Inhibition = 58.0 %
Reference
Title : Mechanism-based inactivation of cytochrome P450 2B6 by methadone through destruction of prosthetic heme. Authors : Amunugama HT, Zhang H, Hollenberg PF. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : Methadone is a μ-opioid receptor agonist widely used in the treatment of narcotic addiction and chronic pain conditions. Methadone is metabolized predominantly in the liver by cytochromes P450 to its pharmacologically inactive primary metabolite 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine. Initial in vitro data suggested that CYP3A4 is the major isoform responsible for the in vivo clearance of methadone in humans. However, recent clinical data have indicated that CYP2B6 is actually the major isoform responsible for methadone metabolism and clearance in vivo. In this study, methadone was shown to act as a mechanism-based inactivator of CYP2B6. Methadone inactivates CYP2B6 in a time-, concentration-, and NADPH-dependent manner with a K(I) = 10.0 μM and k(inact) = 0.027 min⁻¹. The loss of CYP2B6 activity in the presence of methadone and NADPH occurred with concomitant loss of the reduced CO spectrum of the P450. Moreover, there was good correlation between the loss of CYP2B6 activity and the loss of the CO-binding spectrum. High-performance liquid chromatography analysis of the native heme of the inactivated CYP2B6 demonstrated that approximately 75% loss of heme was accompanied by comparable inactivation of CYP2B6. Liquid chromatography-mass spectrometry analysis did not reveal the formation of a protein adduct during the inactivation. The evidence strongly suggests that destruction of prosthetic heme is the underlying mechanism leading to the inactivation of CYP2B6 by methadone. DOI : 10.1124/dmd.112.045971
METHADONE
Inactivation of C-terminal His4-tagged human CYP2B6 lacking 21 N-terminal residues assessed as native heme loss at 50 uM at 37 degC for 20 mins by HPLC analysis in presence of NADPH
—
Inhibition = 75.0 %
Reference
Title : Mechanism-based inactivation of cytochrome P450 2B6 by methadone through destruction of prosthetic heme. Authors : Amunugama HT, Zhang H, Hollenberg PF. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : Methadone is a μ-opioid receptor agonist widely used in the treatment of narcotic addiction and chronic pain conditions. Methadone is metabolized predominantly in the liver by cytochromes P450 to its pharmacologically inactive primary metabolite 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine. Initial in vitro data suggested that CYP3A4 is the major isoform responsible for the in vivo clearance of methadone in humans. However, recent clinical data have indicated that CYP2B6 is actually the major isoform responsible for methadone metabolism and clearance in vivo. In this study, methadone was shown to act as a mechanism-based inactivator of CYP2B6. Methadone inactivates CYP2B6 in a time-, concentration-, and NADPH-dependent manner with a K(I) = 10.0 μM and k(inact) = 0.027 min⁻¹. The loss of CYP2B6 activity in the presence of methadone and NADPH occurred with concomitant loss of the reduced CO spectrum of the P450. Moreover, there was good correlation between the loss of CYP2B6 activity and the loss of the CO-binding spectrum. High-performance liquid chromatography analysis of the native heme of the inactivated CYP2B6 demonstrated that approximately 75% loss of heme was accompanied by comparable inactivation of CYP2B6. Liquid chromatography-mass spectrometry analysis did not reveal the formation of a protein adduct during the inactivation. The evidence strongly suggests that destruction of prosthetic heme is the underlying mechanism leading to the inactivation of CYP2B6 by methadone. DOI : 10.1124/dmd.112.045971
METHADONE
Inactivation of C-terminal His4-tagged human CYP2B6 lacking 21 N-terminal residues assessed as decrease in CO difference spectrum at 100 uM for 15 mins by spectral analysis in presence of NADPH
—
Inhibition = 61.0 %
Reference
Title : Mechanism-based inactivation of cytochrome P450 2B6 by methadone through destruction of prosthetic heme. Authors : Amunugama HT, Zhang H, Hollenberg PF. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : Methadone is a μ-opioid receptor agonist widely used in the treatment of narcotic addiction and chronic pain conditions. Methadone is metabolized predominantly in the liver by cytochromes P450 to its pharmacologically inactive primary metabolite 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine. Initial in vitro data suggested that CYP3A4 is the major isoform responsible for the in vivo clearance of methadone in humans. However, recent clinical data have indicated that CYP2B6 is actually the major isoform responsible for methadone metabolism and clearance in vivo. In this study, methadone was shown to act as a mechanism-based inactivator of CYP2B6. Methadone inactivates CYP2B6 in a time-, concentration-, and NADPH-dependent manner with a K(I) = 10.0 μM and k(inact) = 0.027 min⁻¹. The loss of CYP2B6 activity in the presence of methadone and NADPH occurred with concomitant loss of the reduced CO spectrum of the P450. Moreover, there was good correlation between the loss of CYP2B6 activity and the loss of the CO-binding spectrum. High-performance liquid chromatography analysis of the native heme of the inactivated CYP2B6 demonstrated that approximately 75% loss of heme was accompanied by comparable inactivation of CYP2B6. Liquid chromatography-mass spectrometry analysis did not reveal the formation of a protein adduct during the inactivation. The evidence strongly suggests that destruction of prosthetic heme is the underlying mechanism leading to the inactivation of CYP2B6 by methadone. DOI : 10.1124/dmd.112.045971
NALMEFENE
Inhibition of human CYP2B6 at 10 uM
—
Inhibition = 5.0 %
Reference
Title : Synthesis and pharmacological evaluation of 6-naltrexamine analogs for alcohol cessation. Authors : Ghirmai S, Azar MR, Cashman JR. Publication Year :
2009 Journal : Bioorg. Med. Chem. Abstract : A series of substituted aryl amide derivatives of 6-naltrexamine, 3 designed to be metabolically stable were synthesized and used to characterize the structural requirements for their potency to binding and functional activity of human mu (mu), delta (delta) and kappa (kappa) opioid and nociceptin (NOP) receptors. Binding assays showed that 4-10 had subnanomolar K(i) values for mu and kappa opioid receptors. Functional assays for stimulation of [(35)S]GTPgammaS binding showed that several compounds acted as partial or inverse agonists and antagonists of the mu and delta, kappa opioid or NOP receptors. The compounds showed considerable stability in the presence of rat, mouse or human liver preparations and NADPH. The inhibitory activity on the functional activity of human cytochrome P450s was examined to determine any potential inhibition by 4-9. Only modest inhibition of CYP3A4, CYP2C9 and CYP2C19 was observed for a few of the analogs. As a representative example, radiolabeled 6 was examined in vivo and showed reasonable brain penetration. The inhibition of ethanol self-administration in rats trained to self-administer a 10% (w/v) ethanol solution, utilizing operant techniques showed 5-8 to have very potent efficacy (ED(50) values 19-50 microg/kg). DOI : 10.1016/j.bmc.2009.07.069
OLMESARTAN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PRAVASTATIN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROCAINAMIDE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROPRANOLOL
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ROSIGLITAZONE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TAMOXIFEN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TAMOXIFEN
Mechanism based inhibition of human cytochrome P450 2B6 measured by 7-EFC O-deethylation
—
Ki = 900.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
TICLOPIDINE
Time dependent inhibition of CYP2B6 (unknown origin) at 0.1 uM by LC/MS system
—
Inhibition = 35.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TICLOPIDINE
Inhibition of CYP2B6 in human liver microsomes at 10 uM incubated for 5 mins followed by NADPH addition by LC-MS/MS analysis relative to control
Liver
Inhibition = 98.0 %
Reference
Title : Potent and Selective Human Neuronal Nitric Oxide Synthase Inhibition by Optimization of the 2-Aminopyridine-Based Scaffold with a Pyridine Linker. Authors : Wang HY, Qin Y, Li H, Roman LJ, Martásek P, Poulos TL, Silverman RB. Publication Year :
2016 Journal : J. Med. Chem. Abstract : Neuronal nitric oxide synthase (nNOS) is an important therapeutic target for the treatment of various neurodegenerative disorders. A major challenge in the design of nNOS inhibitors focuses on potency in humans and selectivity over other NOS isoforms. Here we report potent and selective human nNOS inhibitors based on the 2-aminopyridine scaffold with a central pyridine linker. Compound 14j, the most promising inhibitor in this study, exhibits excellent potency for rat nNOS (Ki = 16 nM) with 828-fold n/e and 118-fold n/i selectivity with a Ki value of 13 nM against human nNOS with 1761-fold human n/e selectivity. Compound 14j also displayed good metabolic stability in human liver microsomes, low plasma protein binding, and minimal binding to cytochromes P450 (CYPs), although it had little to no Caco-2 permeability. DOI : 10.1021/acs.jmedchem.6b00273
TICLOPIDINE
Mechanism based inhibition of human cytochrome P450 2B6 measured by bupropion hydroxylation using human liver microsomes
Liver
Ki = 200.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
TICLOPIDINE
Mechanism based inhibition of human cytochrome P450 2B6 measured by bupropion hydroxylation using recombinant CYP2B6
—
Ki = 800.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
TICLOPIDINE
Inhibition of recombinant human CYP2B6 by P450-Glo luminescence assay
—
IC50 = 600.0 nM
Reference
Title : 2-(3-Methoxyphenyl)quinazoline Derivatives: A New Class of Direct Constitutive Androstane Receptor (CAR) Agonists. Authors : Smutny T, Nova A, Drechslerová M, Carazo A, Hyrsova L, Hrušková ZR, Kuneš J, Pour M, Špulák M, Pavek P. Publication Year :
2016 Journal : J. Med. Chem. Abstract : Constitutive androstane receptor (CAR) is a key regulator of xenobiotic and endobiotic metabolism. Together with pregnane X (PXR) and aryl hydrocarbon (AHR) receptors, it is referred to as "xenobiotic receptor". The unique properties of human CAR, such as its high constitutive activity, both direct (ligand-binding domain-dependent) and indirect activation have hindered the discovery of direct selective human CAR ligands. Herein, we report a novel class of direct human CAR agonists in a group of 2-(3-methoxyphenyl)quinazoline derivatives. The compounds are even more potent activators of human CAR than is prototype 6-(4-chlorophenyl)imidazo[2,1-b][1,3]thiazole-5-carbaldehyde O-(3,4-dichlorobenzyl)oxime (CITCO). The three most potent ligands are at the same time extremely potent activators of the other xenobiotic or hormonal receptors, namely PXR, AHR, and vitamin D receptor, which regulate major xenobiotic-metabolizing enzymes and efflux transporters. Thus, the novel CAR ligands can be also considered as constituting the first class of potent pan-xenobiotic receptor ligands that can serve as potential antidotes boosting overall metabolic elimination of xenobiotic or toxic compounds. DOI : 10.1021/acs.jmedchem.5b01891
VERAPAMIL
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition = 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
WARFARIN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ARTEMISININ
Time-dependent inhibition of CYP2B6 in human liver microsomes
Liver
Inhibition < 10.0 %
Reference
Title : Evaluation of P450 inhibition and induction by artemisinin antimalarials in human liver microsomes and primary human hepatocytes. Authors : Xing J, Kirby BJ, Whittington D, Wan Y, Goodlett DR. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : Artemisinin drugs have become the first-line antimalarials in areas of multidrug resistance. However, monotherapy with artemisinin drugs results in comparatively high recrudescence rates. Autoinduction of cytochrome P450 (P450)-mediated metabolism, resulting in reduced exposure, has been supposed to be the underlying mechanism. To better understand the autoinduction and metabolic drug-drug interactions (DDIs), we evaluated the P450s (particularly CYP2B6 and CYP3A4) inhibited or induced by two artemisinin drugs, Qing-hao-su (QHS) and dihydroartemisinin (DHA) using human liver microsome, recombinant P450 enzymes, and primary human hepatocytes. The results suggested that QHS was a weak reversible inhibitor of CYP2B6 (K(i) 4.6 μM), but not CYP3A4 (IC₅₀ ∼ 50 μM) and did not show measurable time-dependent inhibition of either CYP2B6 or CYP3A4. DHA inhibited neither CYP2B6 nor CYP3A4 (IC₅₀ > 125 μM). In addition, it was found that QHS induced the activity of CYP3A4 (E(max) 3.5-fold and EC₅₀ 5.9 μM) and CYP2B6 (E(max) 1.9-fold and EC₅₀ 0.6 μM). Of the other P450s, UDP glucuronosyltransferases, and transporters studied, QHS and DHA had no significant effect except for minor induction of mRNA expression of CYP1A2 (E(max) 7.9-fold and EC₅₀ 5.2 μM) and CYP2A6 (E(max) 11.7-fold and EC₅₀ 4.0 μM) by QHS. Quantitative prediction of P450-mediated DDIs indicate autoinduction of QHS clearance with the AUC(i)/AUC ratio decreasing to 59%, as a result of a 1.9-fold increase in CYP3A4 and a 1.6-fold increase in CYP2B6 activity. These data suggest that QHS drugs are potential inducers of P450 enzymes, and the possible drug interactions (or lack thereof) with artemisinin drugs may be clinically relevant. DOI : 10.1124/dmd.112.045765
ARTEMISININ
Induction of CYP2B6 in human hepatocytes after 72 hrs relative to vehicle-treated control
—
EC50 = 600.0 nM
Reference
Title : Evaluation of P450 inhibition and induction by artemisinin antimalarials in human liver microsomes and primary human hepatocytes. Authors : Xing J, Kirby BJ, Whittington D, Wan Y, Goodlett DR. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : Artemisinin drugs have become the first-line antimalarials in areas of multidrug resistance. However, monotherapy with artemisinin drugs results in comparatively high recrudescence rates. Autoinduction of cytochrome P450 (P450)-mediated metabolism, resulting in reduced exposure, has been supposed to be the underlying mechanism. To better understand the autoinduction and metabolic drug-drug interactions (DDIs), we evaluated the P450s (particularly CYP2B6 and CYP3A4) inhibited or induced by two artemisinin drugs, Qing-hao-su (QHS) and dihydroartemisinin (DHA) using human liver microsome, recombinant P450 enzymes, and primary human hepatocytes. The results suggested that QHS was a weak reversible inhibitor of CYP2B6 (K(i) 4.6 μM), but not CYP3A4 (IC₅₀ ∼ 50 μM) and did not show measurable time-dependent inhibition of either CYP2B6 or CYP3A4. DHA inhibited neither CYP2B6 nor CYP3A4 (IC₅₀ > 125 μM). In addition, it was found that QHS induced the activity of CYP3A4 (E(max) 3.5-fold and EC₅₀ 5.9 μM) and CYP2B6 (E(max) 1.9-fold and EC₅₀ 0.6 μM). Of the other P450s, UDP glucuronosyltransferases, and transporters studied, QHS and DHA had no significant effect except for minor induction of mRNA expression of CYP1A2 (E(max) 7.9-fold and EC₅₀ 5.2 μM) and CYP2A6 (E(max) 11.7-fold and EC₅₀ 4.0 μM) by QHS. Quantitative prediction of P450-mediated DDIs indicate autoinduction of QHS clearance with the AUC(i)/AUC ratio decreasing to 59%, as a result of a 1.9-fold increase in CYP3A4 and a 1.6-fold increase in CYP2B6 activity. These data suggest that QHS drugs are potential inducers of P450 enzymes, and the possible drug interactions (or lack thereof) with artemisinin drugs may be clinically relevant. DOI : 10.1124/dmd.112.045765
IMIPRAMINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CHLOROQUINE
Inhibition of CYP2B6 in human liver microsomes assessed as metabolite produced at 1 uM by LC-MS/MS analysis relative to control
Liver
Inhibition = 112.0 %
Reference
Title : Development of a new generation of 4-aminoquinoline antimalarial compounds using predictive pharmacokinetic and toxicology models. Authors : Ray S, Madrid PB, Catz P, LeValley SE, Furniss MJ, Rausch LL, Guy RK, DeRisi JL, Iyer LV, Green CE, Mirsalis JC. Publication Year :
2010 Journal : J. Med. Chem. Abstract : Among the known antimalarial drugs, chloroquine (CQ) and other 4-aminoquinolines have shown high potency and good bioavailability. Yet complications associated with drug resistance necessitate the discovery of effective new antimalarial agents. ADMET prediction studies were employed to evaluate a library of new molecules based on the 4-aminoquinolone-related structure of CQ. Extensive in vitro screening and in vivo pharmacokinetic studies in mice helped to identify two lead molecules, 18 and 4, with promising in vitro therapeutic efficacy, improved ADMET properties, low risk for drug-drug interactions, and desirable pharmacokinetic profiles. Both 18 and 4 are highly potent antimalarial compounds, with IC(50) values of 5.6 and 17.3 nM, respectively, against the W2 (CQ-resistant) strain of Plasmodium falciparum (for CQ, IC(50) = 382 nM). When tested in mice, these compounds were found to have biological half-lives and plasma exposure values similar to or higher than those of CQ; they are therefore desirable candidates to pursue in future clinical trials. DOI : 10.1021/jm100057h
CHLOROQUINE
Inhibition of CYP2B6 in human liver microsomes assessed as metabolite produced at 10 uM by LC-MS/MS analysis relative to control
Liver
Inhibition = 134.0 %
Reference
Title : Development of a new generation of 4-aminoquinoline antimalarial compounds using predictive pharmacokinetic and toxicology models. Authors : Ray S, Madrid PB, Catz P, LeValley SE, Furniss MJ, Rausch LL, Guy RK, DeRisi JL, Iyer LV, Green CE, Mirsalis JC. Publication Year :
2010 Journal : J. Med. Chem. Abstract : Among the known antimalarial drugs, chloroquine (CQ) and other 4-aminoquinolines have shown high potency and good bioavailability. Yet complications associated with drug resistance necessitate the discovery of effective new antimalarial agents. ADMET prediction studies were employed to evaluate a library of new molecules based on the 4-aminoquinolone-related structure of CQ. Extensive in vitro screening and in vivo pharmacokinetic studies in mice helped to identify two lead molecules, 18 and 4, with promising in vitro therapeutic efficacy, improved ADMET properties, low risk for drug-drug interactions, and desirable pharmacokinetic profiles. Both 18 and 4 are highly potent antimalarial compounds, with IC(50) values of 5.6 and 17.3 nM, respectively, against the W2 (CQ-resistant) strain of Plasmodium falciparum (for CQ, IC(50) = 382 nM). When tested in mice, these compounds were found to have biological half-lives and plasma exposure values similar to or higher than those of CQ; they are therefore desirable candidates to pursue in future clinical trials. DOI : 10.1021/jm100057h
CLOPIDOGREL
Time dependent inhibition of CYP2B6 (unknown origin) at 0.3 uM by LC/MS system
—
Inhibition = 44.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CLOPIDOGREL
Mechanism based inhibition of human cytochrome P450 2B6 using human liver microsomes
Liver
Ki = 500.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
CLOPIDOGREL
Time dependent inhibition of CYP2B6 in human liver microsomes
Liver
Ki = 500.0 nM
Reference
Title : Mechanism-based inactivation (MBI) of cytochrome P450 enzymes: structure-activity relationships and discovery strategies to mitigate drug-drug interaction risks. Authors : Orr ST, Ripp SL, Ballard TE, Henderson JL, Scott DO, Obach RS, Sun H, Kalgutkar AS. Publication Year :
2012 Journal : J. Med. Chem. DOI : 10.1021/jm300065h
PIOGLITAZONE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition = 38.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ZOMEPIRAC
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMINOPYRINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TACRINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TICRYNAFEN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AZD-3759
Inhibition of CYP2B6 (unknown origin)
—
IC50 > 50.0 nM
Reference
Title : Discovery and Evaluation of Clinical Candidate AZD3759, a Potent, Oral Active, Central Nervous System-Penetrant, Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitor. Authors : Zeng Q, Wang J, Cheng Z, Chen K, Johnström P, Varnäs K, Li DY, Yang ZF, Zhang X. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Recent reports suggest that an increasing number of patients with lung cancer, especially those with activating mutations of the epidermal growth factor receptor (EGFR), also present with brain metastases and leptomeningeal metastases. These patients have poor prognosis as there are no approved drugs for these indications. Available agents have poor efficacy for these patients even at well above their standard dose. Herein, we report the discovery of (4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl (2R)-2,4-dimethylpiperazine-1-carboxylate 1m (AZD3759), an investigational drug currently in Phase 1 clinical trial, which has excellent central nervous system penetration and which induces profound regression of brain metastases in a mouse model. DOI : 10.1021/acs.jmedchem.5b01073
INDOMETHACIN
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
EXEMESTANE
Drug metabolism assessed as human recombinant CYP2B6-mediated 17-hydroexemestane and 6-Hydroxymethylexemestane formation assessed as inhibition of metabolite formation at 10 uM after 10 mins by Michaelis-Menten saturation curve analysis in presence of 5 uM thioTEPA
—
Inhibition < 20.0 %
Reference
Title : In vitro cytochrome P450-mediated metabolism of exemestane. Authors : Kamdem LK, Flockhart DA, Desta Z. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Exemestane is a potent and irreversible steroidal aromatase inhibitor drug used for the treatment of estrogen receptor-positive breast cancer. Our aim was to identify and assess the contribution of the specific cytochromes P450 (P450s) responsible for exemestane primary in vitro metabolism. With the use of high-performance liquid chromatography and liquid chromatography-tandem mass spectrometry analytical techniques, 17-hydroexemestane (MI) formation and 6-hydroxymethylexemestane (MII) formation were found to be the predominant exemestane metabolic pathways. In a bank of 15 well characterized human liver microsomes with known P450 isoform-specific activities, the MI formation rate correlated significantly with CYP1A2 (Spearman r = 0.60, p = 0.02) and CYP4A11 (Spearman r = 0.67, p = 0.01) isoform-specific activities, whereas the MII production rate significantly correlated with CYP2B6 (Spearman r = 0.57, p = 0.03) and CYP3A (Spearman r = 0.76, p = 0.005) isoform-specific activities. Recombinant CYP1A1 metabolized exemestane to MI with a catalytic efficiency (Cl(int)) of 150 nl/pmol P450 × min that was at least 3.5-fold higher than those of other P450s investigated. Recombinant CYP3A4 catalyzed MII formation from exemestane with a catalytic efficiency of 840 nl/pmol P450 × min that was at least 4-fold higher than those of other P450s investigated. Among a panel of 10 chemical inhibitors tested, only ketoconazole and troleandomycin (CYP3A-specific chemical inhibitors) significantly inhibited the formation of MII by 45 and 95%, respectively. None of them markedly inhibited the formation of MI. In summary, exemestane seems to be metabolized to MI by multiple P450s that include CYP4A11 and CYP1A1/2, whereas its oxidation to MII is primarily mediated by CYP3A. DOI : 10.1124/dmd.110.032276
EXEMESTANE
Drug metabolism assessed as human recombinant CYP2B6-mediated 17-hydroexemestane and 6-Hydroxymethylexemestane formation assessed as inhibition of metabolite formation at 10 uM after 10 mins by Michaelis-Menten saturation curve analysis in presence of 5 uM ticlopidine
—
Inhibition < 20.0 %
Reference
Title : In vitro cytochrome P450-mediated metabolism of exemestane. Authors : Kamdem LK, Flockhart DA, Desta Z. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Exemestane is a potent and irreversible steroidal aromatase inhibitor drug used for the treatment of estrogen receptor-positive breast cancer. Our aim was to identify and assess the contribution of the specific cytochromes P450 (P450s) responsible for exemestane primary in vitro metabolism. With the use of high-performance liquid chromatography and liquid chromatography-tandem mass spectrometry analytical techniques, 17-hydroexemestane (MI) formation and 6-hydroxymethylexemestane (MII) formation were found to be the predominant exemestane metabolic pathways. In a bank of 15 well characterized human liver microsomes with known P450 isoform-specific activities, the MI formation rate correlated significantly with CYP1A2 (Spearman r = 0.60, p = 0.02) and CYP4A11 (Spearman r = 0.67, p = 0.01) isoform-specific activities, whereas the MII production rate significantly correlated with CYP2B6 (Spearman r = 0.57, p = 0.03) and CYP3A (Spearman r = 0.76, p = 0.005) isoform-specific activities. Recombinant CYP1A1 metabolized exemestane to MI with a catalytic efficiency (Cl(int)) of 150 nl/pmol P450 × min that was at least 3.5-fold higher than those of other P450s investigated. Recombinant CYP3A4 catalyzed MII formation from exemestane with a catalytic efficiency of 840 nl/pmol P450 × min that was at least 4-fold higher than those of other P450s investigated. Among a panel of 10 chemical inhibitors tested, only ketoconazole and troleandomycin (CYP3A-specific chemical inhibitors) significantly inhibited the formation of MII by 45 and 95%, respectively. None of them markedly inhibited the formation of MI. In summary, exemestane seems to be metabolized to MI by multiple P450s that include CYP4A11 and CYP1A1/2, whereas its oxidation to MII is primarily mediated by CYP3A. DOI : 10.1124/dmd.110.032276
NEVIRAPINE
Time dependent inhibition of CYP2B6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
EMAVUSERTIB
Inhibition of CYP2B6 (unknown origin) at 1 uM relative to control
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CARBAMAZEPINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CELECOXIB
Time dependent inhibition of CYP2D6 (unknown origin) at 30 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CINACALCET HYDROCHLORIDE
Inhibition of recombinant human CYP2D6 expressed in bacterial membranes using AMMC as substrate preincubated for 10 mins followed by NADPH addition measured after 30 mins by fluorescence assay
—
IC50 < 100.0 nM
Reference
Title : Discovery of evocalcet, a next-generation calcium-sensing receptor agonist for the treatment of hyperparathyroidism. Authors : Miyazaki H, Ikeda Y, Sakurai O, Miyake T, Tsubota R, Okabe J, Kuroda M, Hisada Y, Yanagida T, Yoneda H, Tsukumo Y, Tokunaga S, Kawata T, Ohashi R, Fukuda H, Kojima K, Kannami A, Kifuji T, Sato N, Idei A, Iguchi T, Sakairi T, Moritani Y. Publication Year :
2018 Journal : Bioorg Med Chem Lett Abstract : The calcium-sensing receptor (CaSR) plays an important role in sensing extracellular calcium ions and regulating parathyroid hormone secretion by parathyroid gland cells, and the receptor is a suitable target for the treatment of hyperparathyroidism. Cinacalcet hydrochloride is a representative CaSR agonist which widely used for the hyperparathyroidism. However, it has several issues to clinical use, such as nausea/vomiting and strong inhibition of CYP2D6. We tried to improve these issues of cinacalcet for a new pharmaceutical agent as a preferable CaSR agonist. Optimization from cinacalcet resulted in the identification of pyrrolidine compounds and successfully led to the discovery of evocalcet as an oral allosteric CaSR agonist. Evocalcet, which exhibited highly favorable profiles such as CaSR agonistic activity and good DMPK profiles, will provide a novel therapeutic option for secondary hyperparathyroidism. DOI : 10.1016/j.bmcl.2018.04.055
CLOTRIMAZOLE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate after 8 mins by LC-MS/MS analysis
Liver
IC50 = 883.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
CLOZAPINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
COLCHICINE
Inhibition of CYP2D6 (unknown origin) at 3 uM
—
Inhibition = 7.7 %
Reference
Title : New cytotoxic benzosuberene analogs. Synthesis, molecular modeling and biological evaluation. Authors : Chen Z, Maderna A, Sukuru SC, Wagenaar M, O'Donnell CJ, Lam MH, Musto S, Loganzo F. Publication Year :
2013 Journal : Bioorg. Med. Chem. Lett. Abstract : In this Letter we describe the synthesis and biological evaluation of new benzosuberene analogs with structural modifications on the B-ring. The focus was initially to probe the chemical space around the B-ring C-8 position. This position was readily available for derivatization chemistry using our recently developed new synthesis for this compound class. Furthermore, we describe two new B-ring analogs, one containing a diene and the other a cyclic ether group. Both new analogs show excellent potencies in tumor cell proliferation assays. In addition, we describe molecular modeling studies that provide a binding rationale for reference compound 8 in the colchicine binding site using the known colchicine crystal structure. We also examine whether the cell based potency data obtained with selected new analogs are supported by modeling results. DOI : 10.1016/j.bmcl.2013.10.039
DICLOFENAC
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DOLUTEGRAVIR
Inhibition of CYP2D6 in human liver microsomes using bufuralol as substrate at 100 uM preincubated for 20 mins with substrate prior to initiation of reaction with NADPH by HPLC analysis
Liver
Inhibition = 20.0 %
Reference
Title : In vitro investigations into the roles of drug transporters and metabolizing enzymes in the disposition and drug interactions of dolutegravir, a HIV integrase inhibitor. Authors : Reese MJ, Savina PM, Generaux GT, Tracey H, Humphreys JE, Kanaoka E, Webster LO, Harmon KA, Clarke JD, Polli JW. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Dolutegravir (DTG; S/GSK1349572) is a potent HIV-1 integrase inhibitor with a distinct resistance profile and a once-daily dose regimen that does not require pharmacokinetic boosting. This work investigated the in vitro drug transport and metabolism of DTG and assessed the potential for clinical drug-drug interactions. DTG is a substrate for the efflux transporters P-glycoprotein (Pgp) and human breast cancer resistance protein (BCRP). Its high intrinsic membrane permeability limits the impact these transporters have on DTG's intestinal absorption. UDP-glucuronosyltransferase (UGT) 1A1 is the main enzyme responsible for the metabolism of DTG in vivo, with cytochrome P450 (P450) 3A4 being a notable pathway and UGT1A3 and UGT1A9 being only minor pathways. DTG demonstrated little or no inhibition (IC(50) values > 30 μM) in vitro of the transporters Pgp, BCRP, multidrug resistance protein 2, organic anion transporting polypeptide 1B1/3, organic cation transporter (OCT) 1, or the drug metabolizing enzymes CYP1A2, 2A6, 2B6, 2C8, 2C9, 2C19, 2D6, 3A4, UGT1A1, or 2B7. Further, DTG did not induce CYP1A2, 2B6, or 3A4 mRNA in vitro using human hepatocytes. DTG does inhibit the renal OCT2 (IC(50) = 1.9 μM) transporter, which provides a mechanistic basis for the mild increases in serum creatinine observed in clinical studies. These in vitro studies demonstrate a low propensity for DTG to be a perpetrator of clinical drug interactions and provide a basis for predicting when other drugs could result in a drug interaction with DTG. DOI : 10.1124/dmd.112.048918
ERYTHROMYCIN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ETHINYL ESTRADIOL
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FLUTAMIDE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FUROSEMIDE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
KETOCONAZOLE
Inhibition of CYP2D6 in human liver microsomes assessed as bufuralol hydroxylation to 4'-hydroxybufuralol at 1 uM after 10 mins relative to control
Liver
Inhibition = 4.0 %
Reference
Title : Rational development of 4-aminopyridyl-based inhibitors targeting Trypanosoma cruzi CYP51 as anti-chagas agents. Authors : Choi JY, Calvet CM, Gunatilleke SS, Ruiz C, Cameron MD, McKerrow JH, Podust LM, Roush WR. Publication Year :
2013 Journal : J. Med. Chem. Abstract : A new series of 4-aminopyridyl-based lead inhibitors targeting Trypanosoma cruzi CYP51 (TcCYP51) has been developed using structure-based drug design as well as structure-property relationship (SPR) analyses. The screening hit starting point, LP10 (KD ≤ 42 nM; EC50 = 0.65 μM), has been optimized to give the potential leads 14t, 27i, 27q, 27r, and 27t, which have low-nanomolar binding affinity to TcCYP51 and significant activity against T. cruzi amastigotes cultured in human myoblasts (EC50 = 14-18 nM for 27i and 27r). Many of the optimized compounds have improved microsome stability, and most are selective against human CYPs 1A2, 2D6, and 3A4 (<50% inhibition at 1 μM). A rationale for the improvement in microsome stability and selectivity of inhibitors against human metabolic CYP enzymes is presented. In addition, the binding mode of 14t with the Trypanosoma brucei CYP51 (TbCYP51) orthologue has been characterized by X-ray structure analysis. DOI : 10.1021/jm401067s
LEVOFLOXACIN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
MILTEFOSINE
Inhibition of human microsomal CYP2D6 expressed in baculovirus infected insect cells at 10 uM using luciferin-ME as substrate preincubated with enzyme/substrate mixture for 30 mins followed by further incubation with NADPH for 30 mins by CYP450 luciferase Glo assay relative to control
—
Inhibition = 30.8 %
Reference
Title : Discovery of a benzothiophene-flavonol halting miltefosine and antimonial drug resistance in Leishmania parasites through the application of medicinal chemistry, screening and genomics. Authors : Borsari C, Jiménez-Antón MD, Eick J, Bifeld E, Torrado JJ, Olías-Molero AI, Corral MJ, Santarem N, Baptista C, Severi L, Gul S, Wolf M, Kuzikov M, Ellinger B, Reinshagen J, Witt G, Linciano P, Tait A, Costantino L, Luciani R, Tejera Nevado P, Zander-Dinse D, Franco CH, Ferrari S, Moraes CB, Cordeiro-da-Silva A, Ponterini G, Clos J, Alunda JM, Costi MP. Publication Year :
2019 Journal : Eur J Med Chem Abstract : Leishmaniasis, a major health problem worldwide, has a limited arsenal of drugs for its control. The appearance of resistance to first- and second-line anti-leishmanial drugs confirms the need to develop new and less toxic drugs that overcome spontaneous resistance. In the present study, we report the design and synthesis of a novel library of 38 flavonol-like compounds and their evaluation in a panel of assays encompassing parasite killing, pharmacokinetics, genomics and ADME-Toxicity resulting in the progression of a compound in the drug discovery value chain. Compound 19, 2-(benzo[b]thiophen-3-yl)-3-hydroxy-6-methoxy-4H-chromen-4-one, exhibited a broad-spectrum activity against Leishmania spp. (EC50 1.9 μM for Leishmania infantum, 3.4 μM for L. donovani, 6.7 μM for L. major), Trypanosoma cruzi (EC50 7.5 μM) and T. brucei (EC50 0.8 μM). Focusing on anti-Leishmania activity, compound 19 challenge in vitro did not select for resistance markers in L. donovani, while a Cos-Seq screening for dominant resistance genes identified a gene locus on chromosome 36 that became ineffective at concentrations beyond EC50. Thus, compound 19 is a promising scaffold to tackle drug resistance in Leishmania infection. In vivo pharmacokinetic studies indicated that compound 19 has a long half-life (intravenous (IV): 63.2 h; per os (PO): 46.9 h) with an acceptable ADME-Toxicity profile. When tested in Leishmania infected hamsters, no toxicity and limited efficacy were observed. Low solubility and degradation were investigated spectroscopically as possible causes for the sub-optimal pharmacokinetic properties. Compound 19 resulted a specific compound based on the screening against a protein set, following the intrinsic fluorescence changes. DOI : 10.1016/j.ejmech.2019.111676
MIRABEGRON
Inhibition of CYP2D6 (unknown origin) at 10 uM relative to control
—
Inhibition = 87.0 %
Reference
Title : Discovery of Novel Indazole Derivatives as Orally Available β3-Adrenergic Receptor Agonists Lacking Off-Target-Based Cardiovascular Side Effects. Authors : Wada Y, Nakano S, Morimoto A, Kasahara KI, Hayashi T, Takada Y, Suzuki H, Niwa-Sakai M, Ohashi S, Mori M, Hirokawa T, Shuto S. Publication Year :
2017 Journal : J Med Chem Abstract : We previously discovered that indazole derivative 8 was a highly selective β3-adrenergic receptor (β3-AR) agonist, but it appeared to be metabolically unstable. To improve metabolic stability, further optimization of this scaffold was carried out. We focused on the sulfonamide moiety of this scaffold, which resulted in the discovery of compound 15 as a highly potent β3-AR agonist (EC50 = 18 nM) being inactive to β1-, β2-, and α1A-AR (β1/β3, β2/β3, and α1A/β3 > 556-fold). Compound 15 showed dose-dependent β3-AR-mediated responses in marmoset urinary bladder smooth muscle, had a desirable metabolic stability and pharmacokinetic profile (Cmax and AUC), and did not obviously affect heart rate or mean blood pressure when administered intravenously (3 mg/kg) to anesthetized rats. Thus, compound 15 is a highly potent, selective, and orally available β3-AR agonist, which may serve as a candidate drug for the treatment of overactive bladder without off-target-based cardiovascular side effects. DOI : 10.1021/acs.jmedchem.6b01197
OLANZAPINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition = 63.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PAROXETINE HYDROCHLORIDE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate after 8 mins by LC-MS/MS analysis
Liver
IC50 = 960.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
PERPHENAZINE
Inhibition of CYP2D6 in human liver microsomes using bufuralol substrate by LC-MS/MS method
Liver
IC50 = 120.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
PHENYTOIN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
QUINIDINE SULFATE
Inhibitory concentration against human hepatic cytochrome P450 2D6 enzyme
—
IC50 = 20.0 nM
Reference
Title : Heteroaryl-substituted naphthalenes and structurally modified derivatives: selective inhibitors of CYP11B2 for the treatment of congestive heart failure and myocardial fibrosis. Authors : Voets M, Antes I, Scherer C, Müller-Vieira U, Biemel K, Barassin C, Marchais-Oberwinkler S, Hartmann RW. Publication Year :
2005 Journal : J. Med. Chem. Abstract : Recently we proposed inhibition of aldosterone synthase (CYP11B2) as a novel strategy for the treatment of congestive heart failure and myocardial fibrosis. In this study the synthesis and biological evaluation of heteroaryl-substituted naphthalenes and quinolines (1-31) is described. Key step for the preparation of the compounds was a Suzuki cross-coupling. Activity of the compounds was determined in vitro using human CYP11B2 and selectivity was evaluated toward the human steroidogenic enzymes CYP11B1, CYP19, and CYP17. A large number of highly active and selective inhibitors of CYP11B2 was identified. The most active inhibitor was the 6-cyano compound 8 (IC50 = 3 nM) showing a competitive type of inhibition (K(i) value = 1.9 nM). The 6-ethoxy derivative 5 was found to be the most selective CYP11B2 inhibitor (IC50 = 12 nM; K(i) value = 8 nM; CYP11B1 IC50 = 5419 nM; selectivity factor = 451), showing no inhibition of human CYP3A4 (50 nM) and CYP2D6 (20 nM). Docking and molecular dynamics studies using our homology modeled CYP11B2 structure with selected compounds were performed. Caco-2 cell experiments revealed a large number of medium and highly permeable compounds and metabolic studies with 2 using rat liver microsomes showed sufficient stability. DOI : 10.1021/jm0503704
QUINIDINE SULFATE
Inhibition of human CYP2D6 expressed in Escherichia coli JM109
—
IC50 = 20.0 nM
Reference
Title : Catalytic site prediction and virtual screening of cytochrome P450 2D6 substrates by consideration of water and rescoring in automated docking. Authors : de Graaf C, Oostenbrink C, Keizers PH, van der Wijst T, Jongejan A, Vermeulen NP. Publication Year :
2006 Journal : J. Med. Chem. Abstract : Automated docking strategies successfully applied to binding mode predictions of ligands in Cyt P450 crystal structures in an earlier study (de Graaf et al. J. Med. Chem. 2005, 7, 2308-2318) were used for the catalytic site prediction (CSP) of 65 substrates in a CYP2D6 homology model. The consideration of water molecules at predicted positions in the active site and the rescoring of pooled docking poses from four different docking programs (AutoDock, FlexX, GOLD-Goldscore, and GOLD-Chemscore) with the SCORE scoring function enabled the successful prediction of experimentally reported sites of catalysis of more than 80% of the substrates. Three docking algorithms (FlexX, GOLD-Goldscore, and GOLD-Chemscore) were subsequently used in combination with six scoring functions (Chemscore, DOCK, FlexX, GOLD, PMF, and SCORE) to assess the ability of docking-based virtual screening methods to prioritize known CYP2D6 substrates seeded into a drug-like chemical database (in the absence and presence of active-site water molecules). Finally, the optimal docking strategy in terms of virtual screening accuracy, GOLD-Chemscore with the consideration of active-site water (60% of known substrates recovered in the top 5% of the ranked drug-like database), was verified experimentally; it was successfully used to identify high-affinity CYP2D6 ligands among a larger proprietary database. DOI : 10.1021/jm0508538
RITONAVIR
Time dependent inhibition of CYP2D6 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
SULFAMETHOXAZOLE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
SULFAPHENAZOLE
Inhibition of CYP2D6 in human liver microsomes assessed as bufuralol hydroxylation to 4'-hydroxybufuralol at 10 uM after 10 mins relative to control
Liver
Inhibition = 7.0 %
Reference
Title : Rational development of 4-aminopyridyl-based inhibitors targeting Trypanosoma cruzi CYP51 as anti-chagas agents. Authors : Choi JY, Calvet CM, Gunatilleke SS, Ruiz C, Cameron MD, McKerrow JH, Podust LM, Roush WR. Publication Year :
2013 Journal : J. Med. Chem. Abstract : A new series of 4-aminopyridyl-based lead inhibitors targeting Trypanosoma cruzi CYP51 (TcCYP51) has been developed using structure-based drug design as well as structure-property relationship (SPR) analyses. The screening hit starting point, LP10 (KD ≤ 42 nM; EC50 = 0.65 μM), has been optimized to give the potential leads 14t, 27i, 27q, 27r, and 27t, which have low-nanomolar binding affinity to TcCYP51 and significant activity against T. cruzi amastigotes cultured in human myoblasts (EC50 = 14-18 nM for 27i and 27r). Many of the optimized compounds have improved microsome stability, and most are selective against human CYPs 1A2, 2D6, and 3A4 (<50% inhibition at 1 μM). A rationale for the improvement in microsome stability and selectivity of inhibitors against human metabolic CYP enzymes is presented. In addition, the binding mode of 14t with the Trypanosoma brucei CYP51 (TbCYP51) orthologue has been characterized by X-ray structure analysis. DOI : 10.1021/jm401067s
VALPROIC ACID
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VALSARTAN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VORICONAZOLE
Inhibition of CYP2D6 in human liver microsomes assessed as dextromethorphan O-demethylation at 100 uM after 30 mins
Liver
Inhibition = 25.0 %
Reference
Title : Comprehensive in vitro analysis of voriconazole inhibition of eight cytochrome P450 (CYP) enzymes: major effect on CYPs 2B6, 2C9, 2C19, and 3A. Authors : Jeong S, Nguyen PD, Desta Z. Publication Year :
2009 Journal : Antimicrob. Agents Chemother. Abstract : Voriconazole is an effective antifungal drug, but adverse drug-drug interactions associated with its use are of major clinical concern. To identify the mechanisms of these interactions, we tested the inhibitory potency of voriconazole with eight human cytochrome P450 (CYP) enzymes. Isoform-specific probes were incubated with human liver microsomes (HLMs) (or expressed CYPs) and cofactors in the absence and the presence of voriconazole. Preincubation experiments were performed to test mechanism-based inactivation. In pilot experiments, voriconazole showed inhibition of CYP2B6, CYP2C9, CYP2C19, and CYP3A (half-maximal [50%] inhibitory concentrations, <6 microM); its effect on CYP1A2, CYP2A6, CYP2C8, and CYP2D6 was marginal (<25% inhibition at 100 microM voriconazole). Further detailed experiments with HLMs showed that voriconazole is a potent competitive inhibitor of CYP2B6 (K(i) < 0.5), CYP2C9 (K(i) = 2.79 microM), and CYP2C19 (K(i) = 5.1 microM). The inhibition of CYP3A by voriconazole was explained by noncompetitive (K(i) = 2.97 microM) and competitive (K(i) = 0.66 microM) modes of inhibition. Prediction of the in vivo interaction of voriconazole from these in vitro data suggests that voriconazole would substantially increase the exposure of drugs metabolized by CYP2B6, CYP2C9, CYP2C19, and CYP3A. Clinicians should be aware of these interactions and monitor patients for adverse effects or failure of therapy. DOI : 10.1128/aac.01123-08
VORINOSTAT
Percent inhibition of CYP450 2D6 at 1uM concentration
—
Inhibition = 8.0 %
Reference
Title : Identification and optimisation of a series of substituted 5-pyridin-2-yl-thiophene-2-hydroxamic acids as potent histone deacetylase (HDAC) inhibitors. Authors : Price S, Bordogna W, Braganza R, Bull RJ, Dyke HJ, Gardan S, Gill M, Harris NV, Heald RA, van den Heuvel M, Lockey PM, Lloyd J, Molina AG, Roach AG, Roussel F, Sutton JM, White AB. Publication Year :
2007 Journal : Bioorg. Med. Chem. Lett. Abstract : Further investigation of a series of thienyl-based hydroxamic acids that included ADS100380 and ADS102550 led to the identification of the 5-pyridin-2-yl-thiophene-2-hydroxamic acid 3c, which possessed modest HDAC inhibitory activity. Substitution at the 5- and 6-positions of the pyridyl ring of compound 3c provided compounds 5a-g, 7a, b, 9, and 13a. Compound 5b demonstrated improved potency, in vitro DMPK profile, and rat oral bioavailability, compared to ADS102550. Functionalisation of the pendent phenyl group of compounds 5b, 5e and 13a provided analogues that possessed excellent enzyme inhibition and anti-proliferative activity. DOI : 10.1016/j.bmcl.2006.10.045
VORINOSTAT
Inhibition of human CYP2D6 using 3-[2-(N,N-diethyl-N-methylamino)ethyl]-7-methoxy-4-methylcoumarin as substrate at 10 uM after 30 mins by fluorimetric analysis
—
Inhibition = 25.0 %
Reference
Title : Synthesis, biological characterization and molecular modeling insights of spirochromanes as potent HDAC inhibitors. Authors : Thaler F, Moretti L, Amici R, Abate A, Colombo A, Carenzi G, Fulco MC, Boggio R, Dondio G, Gagliardi S, Minucci S, Sartori L, Varasi M, Mercurio C. Publication Year :
2016 Journal : Eur. J. Med. Chem. Abstract : In the last decades, inhibitors of histone deacetylases (HDAC) have become an important class of anti-cancer agents. In a previous study we described the synthesis of spiro[chromane-2,4'-piperidine]hydroxamic acid derivatives able to inhibit histone deacetylase enzymes. Herein, we present our exploration for new derivatives by replacing the piperidine moiety with various cycloamines. The goal was to obtain highly potent compounds with a good in vitro ADME profile. In addition, molecular modeling studies unravelled the binding mode of these inhibitors. DOI : 10.1016/j.ejmech.2015.11.010
ZAFIRLUKAST
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ALISKIREN
Inhibition of CYP2D6 in human liver microsomes from 10 healthy donors at 200 uM aliskiren (SPP100)
Liver
Inhibition = 32.9 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
ALISKIREN
Inhibitory activity of 200 gM SPP100 on cDNA-derived CYP2D6 enzyme in microsome prepared from human lymphoblastoid cell line
—
Inhibition = 37.0 %
Reference
Title : FDA drug approval package for Aliskiren hemifumarate Authors : None Publication Year :
None Journal : None Abstract : Drug Approval Package documents downloaded from Drugs@FDA. Data extracted from various pdfs.
- hERG study and start of ADME section: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P1.pdf
- ADME/PK studies, metabolic schemes: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P2.pdf
- Marmoset toxicity study including PK parameters: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_PharmR_P3.pdf
- Metabolism studies and human PK: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P1.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P2.pdf
- human metabolic scheme: http://www.accessdata.fda.gov/drugsatfda_docs/nda/2007/021985s000_ClinPharmR_P3.pdf
AMIODARONE
Inhibition of CYP2D6-mediated dextromethorphan metabolite formation in human liver microsomes at 5 uM after 8 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 36.5 %
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
AMLODIPINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMLODIPINE
Time dependent inhibition of CYP2D6 (unknown origin) at 30 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMODIAQUINE
Time dependent inhibition of CYP2D6 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
AMODIAQUINE
Inhibition of CYP2D6 in human liver microsomes using bufuralol substrate by LC-MS/MS method
Liver
IC50 = 640.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
ATORVASTATIN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BATEFENTEROL
Inhibition of CYP2D6 (unknown origin) at 600 nM
—
Inhibition < 20.0 %
Reference
Title : Discovery of (R)-1-(3-((2-chloro-4-(((2-hydroxy-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethyl)amino)methyl)-5-methoxyphenyl)amino)-3-oxopropyl)piperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate (TD-5959, GSK961081, batefenterol): first-in-class dual pharmacology multivalent muscarinic antagonist and β₂ agonist (MABA) for the treatment of chronic obstructive pulmonary disease (COPD). Authors : Hughes AD, Chen Y, Hegde SS, Jasper JR, Jaw-Tsai S, Lee TW, McNamara A, Pulido-Rios MT, Steinfeld T, Mammen M. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Through application of our multivalent approach to drug discovery we previously reported the first discovery of dual pharmacology MABA bronchodilators, exemplified by 1. Herein we describe the subsequent lead optimization of both muscarinic antagonist and β2 agonist activities, through modification of the linker motif, to achieve 24 h duration of action in a guinea pig bronchoprotection model. Concomitantly we targeted high lung selectivities, low systemic exposures and identified crystalline forms suitable for inhalation devices. This article culminates with the discovery of our first clinical candidate 12f (TD-5959, GSK961081, batefenterol). In a phase 2b trial, batefenterol produced statistical and clinically significant differences compared to placebo and numerically greater improvements in the primary end point of trough FEV1 compared to salmeterol after 4 weeks of dosing in patients with moderate to severe chronic obstructive pulmonary disease (COPD). DOI : 10.1021/jm501915g
BENZBROMARONE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CAFFEINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
CPI-1205
Inhibition of CYP2D6 (unknown origin) at 10 uM relative to control
—
Inhibition = 9.5 %
Reference
Title : Identification of (R)-N-((4-Methoxy-6-methyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-2-methyl-1-(1-(1-(2,2,2-trifluoroethyl)piperidin-4-yl)ethyl)-1H-indole-3-carboxamide (CPI-1205), a Potent and Selective Inhibitor of Histone Methyltransferase EZH2, Suitable for Phase I Clinical Trials for B-Cell Lymphomas. Authors : Vaswani RG,Gehling VS,Dakin LA,Cook AS,Nasveschuk CG,Duplessis M,Iyer P,Balasubramanian S,Zhao F,Good AC,Campbell R,Lee C,Cantone N,Cummings RT,Normant E,Bellon SF,Albrecht BK,Harmange JC,Trojer P,Audia JE,Zhang Y,Justin N,Chen S,Wilson JR,Gamblin SJ Publication Year :
2016 Journal : J Med Chem Abstract : Polycomb repressive complex 2 (PRC2) has been shown to play a major role in transcriptional silencing in part by installing methylation marks on lysine 27 of histone 3. Dysregulation of PRC2 function correlates with certain malignancies and poor prognosis. EZH2 is the catalytic engine of the PRC2 complex and thus represents a key candidate oncology target for pharmacological intervention. Here we report the optimization of our indole-based EZH2 inhibitor series that led to the identification of CPI-1205, a highly potent (biochemical IC = 0.002 μM, cellular EC = 0.032 μM) and selective inhibitor of EZH2. This compound demonstrates robust antitumor effects in a Karpas-422 xenograft model when dosed at 160 mg/kg BID and is currently in Phase I clinical trials. Additionally, we disclose the co-crystal structure of our inhibitor series bound to the human PRC2 complex. DOI : 10.1021/acs.jmedchem.6b01315
DONEPEZIL
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition = 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
FASIGLIFAM
Inhibition of CYP2D6 in human liver microsomes at 5 uM using dextromethorphan as substrate by LC-MS/MS analysis relative to control
Liver
Inhibition = 23.22 %
Reference
Title : Design, synthesis and biological evaluation of a series of novel GPR40 agonists containing nitrogen heterocyclic rings. Authors : Sun Z, Zhou T, Pan X, Yang Y, Huan Y, Xiao Z, Shen Z, Liu Z. Publication Year :
2018 Journal : Bioorg Med Chem Lett Abstract : A novel series of GPR40 agonists is designed by introducing nitrogen-containing heterocyclic ring at the terminal phenyl ring of TAK-875 with the aim of decreasing its lipophilicity. Three different β-substituted phenylpropionic acids were investigated as the acidic components. A total of 34 compounds have been synthesized, among which, compound 30 exhibited comparable GPR40 agonistic activity in vitro with TAK-875 and relatively lower lipophilicity through calculation (30, EC50 = 1.2 μM, cLogP = 1.3; TAK-875: EC50 = 5.1 μM, cLogP = 3.4). Moreover, compound 30 was able to enhance the insulin secretion of primary islets isolated from normal ICR mice and showed no obvious inhibition against cytochromes P450 in vitro. In vivo, compound 30 exhibited efficacy in oral glucose tolerance test (oGTT) in normal ICR mice. DOI : 10.1016/j.bmcl.2018.07.048
FLUOXETINE
Inhibition of human recombinant CYP2D6 at 5 uM assessed as blockade of O-demethylation of dextromethorphan in to dextrophan by nanoscale automated in-capillary assay
—
Inhibition = 20.0 %
Reference
Title : Development of an in-capillary approach to nanoscale automated in vitro cytochromes p450 assays. Authors : Nicoli R, Curcio R, Rudaz S, Veuthey JL. Publication Year :
2009 Journal : J. Med. Chem. Abstract : A method to perform nanoscale automated CYP450-based drug metabolism studies using a capillary as a reaction vessel is described. In-capillary assays consumed only approximately 30 nL of recombinant human CYP450 solution. Ultrafast analysis of substrates and metabolites was achieved off-line by ultrahigh-pressure liquid chromatography coupled to mass spectrometry. This approach was successfully applied to qualitative metabolism studies of six major CYP450 isozymes and CYP2D6 inhibition experiments. DOI : 10.1021/jm900201b
FLUOXETINE
Time dependent inhibition of CYP2D6 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
METOCLOPRAMIDE
Mechanism based inhibition of human cytochrome P450 2D6 measured by dextromethorphan O-demethylation
—
Ki = 960.0 nM
Reference
Title : Cytochrome p450 enzymes mechanism based inhibitors: common sub-structures and reactivity. Authors : Fontana E, Dansette PM, Poli SM. Publication Year :
2005 Journal : Curr. Drug Metab. Abstract : The inhibition of human cytochrome P450s (CYPs) is one of the most common mechanisms which can lead to drug-drug interactions. The inhibition of CYPs can be reversible (competitive or non-competitive) or irreversible. Irreversible inhibition usually derives from activation of a drug by CYPs into a reactive metabolite, which tightly binds to the enzyme active site, leading to a long lasting inactivation. This process is called "mechanism based inhibition" or "suicide inhibition". The irreversible inactivation usually implies the formation of a covalent bond between the metabolite and the enzyme, which can lead to hapten formation and can in some cases trigger an autoimmune-response. For these reasons it is of utmost importance to study the mechanism of the CYP inhibition of new potential drugs as early as possible during the drug discovery process. The literature on CYPs is vast and covers numerous aspects of their biology and biochemistry, however to our knowledge there is no general and systematic review focusing on mechanism-based inhibitors; we have reviewed the literature and compiled all the available data on chemical entities, which are known to be CYP suicide inhibitors. Each compound is reported together with its chemical structure, the CYP isoform and the parameters describing the inactivation. Literature references are reported together with their PMID (PubMed ID number) to allow a fast retrieval of the papers. This review offers a quick reference to help predict liabilities of new chemical entities without carrying out extensive in vitro work, and will hopefully help in designing safer drugs. DOI : 10.2174/138920005774330639
MIBEFRADIL
Inhibition of human recombinant CYP2D6-mediated 7-methoxy-4(aminomethyl)-coumarine degradation
—
IC50 = 63.0 nM
Reference
Title : Discovery of N-[[1-[2-(tert-butylcarbamoylamino)ethyl]-4-(hydroxymethyl)-4-piperidyl]methyl]-3,5-dichloro-benzamide as a selective T-type calcium channel (Cav3.2) inhibitor. Authors : Giordanetto F, Wållberg A, Knerr L, Selmi N, Ullah V, Thorstensson F, Lindelöf Å, Karlsson S, Nikitidis G, Llinas A, Wang QD, Lindqvist A, Högberg G, Lindhardt E, Åstrand A, Duker G. Publication Year :
2013 Journal : Bioorg. Med. Chem. Lett. Abstract : The T-type calcium channel inhibitor Mibefradil was reported to protect the heart from atrial remodeling, a key process involved in the development of atrial fibrillation and arrhythmias. Mibefradil is not a selective T-type calcium channel inhibitor and also affects the function of different ion channels. Our aim was to develop a selective T-type calcium channel inhibitor to validate the importance of T-type-related pharmacology in atrial fibrillation. Structural optimisation of a previously disclosed hit series focussed on minimising exposure to the central nervous system and improving pharmacokinetic properties, while maintain adequate potency and selectivity. This resulted in the design of N-[[1-[2-(tert-butylcarbamoylamino)ethyl]-4-(hydroxymethyl)-4-piperidyl]methyl]-3,5-dichloro-benzamide, a novel, selective, peripherally restricted chemical probe to verify the role of T-type calcium channel inhibition on atrial fibrillation protection. DOI : 10.1016/j.bmcl.2012.10.140
MIBEFRADIL
Inhibition of CYP2D6 in human liver microsomes using bufuralol substrate by LC-MS/MS method
Liver
IC50 = 840.0 nM
Reference
Title : Discovery and characterization of novel, potent, and selective cytochrome P450 2J2 inhibitors. Authors : Ren S, Zeng J, Mei Y, Zhang JZ, Yan SF, Fei J, Chen L. Publication Year :
2013 Journal : Drug Metab. Dispos. Abstract : Cytochrome P450 (CYP) 2J2 is one of the human CYPs involved in phase I xenobiotics metabolism. It is mainly expressed in extrahepatic tissues, including intestine and cardiovascular systems. The general role of CYP2J2 in drug metabolism is not yet fully understood, and the recent discovery that CYP2J2 can metabolize a wide range of structurally diverse drugs and its primary distribution in the intestine suggest its potentially indispensable role in first-pass intestinal metabolism and involvement in drug-drug interaction. To fully characterize its role in drug metabolism, selective and potent inhibitors of CYP2J2 are necessary tools. In the current study, 69 known drugs were screened for the inhibition of CYP2J2, and we discovered a number of marketed drugs as potent and selective CYP2J2 inhibitors. In particular, telmisartan and flunarizine have CYP2J2 inhibition IC(50) values of 0.42 μM and 0.94 μM, respectively, which are at least 10-fold more selective against all other major metabolizing CYPs; moreover, they are not substrates of CYP2J2 and show no time-dependent inhibition toward this CYP. The results of enzyme kinetics studies, supported by molecular modeling, have also elucidated that telmisartan is a mixed-type inhibitor, and flunarizine competitively inhibits CYP2J2. The K(i) for telmisartan is 0.19 μM, with an α value, an indicator of the type of inhibition mechanism, of 2.80, and flunarizine has a K(i) value of 0.13 μM. These newly discovered CYP2J2 inhibitors can be potentially used as a tool to study CYP2J2 in drug metabolism and interaction in a clinical setting. DOI : 10.1124/dmd.112.048264
NALMEFENE
Inhibition of human CYP2D6 at 10 uM
—
Inhibition = 31.0 %
Reference
Title : Synthesis and pharmacological evaluation of 6-naltrexamine analogs for alcohol cessation. Authors : Ghirmai S, Azar MR, Cashman JR. Publication Year :
2009 Journal : Bioorg. Med. Chem. Abstract : A series of substituted aryl amide derivatives of 6-naltrexamine, 3 designed to be metabolically stable were synthesized and used to characterize the structural requirements for their potency to binding and functional activity of human mu (mu), delta (delta) and kappa (kappa) opioid and nociceptin (NOP) receptors. Binding assays showed that 4-10 had subnanomolar K(i) values for mu and kappa opioid receptors. Functional assays for stimulation of [(35)S]GTPgammaS binding showed that several compounds acted as partial or inverse agonists and antagonists of the mu and delta, kappa opioid or NOP receptors. The compounds showed considerable stability in the presence of rat, mouse or human liver preparations and NADPH. The inhibitory activity on the functional activity of human cytochrome P450s was examined to determine any potential inhibition by 4-9. Only modest inhibition of CYP3A4, CYP2C9 and CYP2C19 was observed for a few of the analogs. As a representative example, radiolabeled 6 was examined in vivo and showed reasonable brain penetration. The inhibition of ethanol self-administration in rats trained to self-administer a 10% (w/v) ethanol solution, utilizing operant techniques showed 5-8 to have very potent efficacy (ED(50) values 19-50 microg/kg). DOI : 10.1016/j.bmc.2009.07.069
OLMESARTAN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PACRITINIB
Inhibition of CYP2D6 in human liver microsomes assessed as decrease in formation of dextrorphan from dextromethorphan substrate at 5 uM after 30 mins by LC-MS/MS
Liver
Inhibition = 20.0 %
Reference
Title : Discovery of the macrocycle 11-(2-pyrrolidin-1-yl-ethoxy)-14,19-dioxa-5,7,26-triaza-tetracyclo[19.3.1.1(2,6).1(8,12)]heptacosa-1(25),2(26),3,5,8,10,12(27),16,21,23-decaene (SB1518), a potent Janus kinase 2/fms-like tyrosine kinase-3 (JAK2/FLT3) inhibitor for the treatment of myelofibrosis and lymphoma. Authors : William AD, Lee AC, Blanchard S, Poulsen A, Teo EL, Nagaraj H, Tan E, Chen D, Williams M, Sun ET, Goh KC, Ong WC, Goh SK, Hart S, Jayaraman R, Pasha MK, Ethirajulu K, Wood JM, Dymock BW. Publication Year :
2011 Journal : J. Med. Chem. Abstract : Discovery of the activating mutation V617F in Janus Kinase 2 (JAK2(V617F)), a tyrosine kinase critically involved in receptor signaling, recently ignited interest in JAK2 inhibitor therapy as a treatment for myelofibrosis (MF). Herein, we describe the design and synthesis of a series of small molecule 4-aryl-2-aminopyrimidine macrocycles and their biological evaluation against the JAK family of kinase enzymes and FLT3. The most promising leads were assessed for their in vitro ADME properties culminating in the discovery of 21c, a potent JAK2 (IC(50) = 23 and 19 nM for JAK2(WT) and JAK2(V617F), respectively) and FLT3 (IC(50) = 22 nM) inhibitor with selectivity against JAK1 and JAK3 (IC(50) = 1280 and 520 nM, respectively). Further profiling of 21c in preclinical species and mouse xenograft and allograft models is described. Compound 21c (SB1518) was selected as a development candidate and progressed into clinical trials where it is currently in phase 2 for MF and lymphoma. DOI : 10.1021/jm200326p
PAROXETINE
Inhibition of human CYP2D6 at 10 uM preincubated for 10 mins with cofactor followed by mixture of enzyme-substrate addition by fluorescence assay relative to control
—
Inhibition = 96.5 %
Reference
Title : Osthol and curcumin as inhibitors of human Pgp and multidrug efflux pumps of Staphylococcus aureus: reversing the resistance against frontline antibacterial drugs Authors : Joshi P, Singh S, Wani A, Sharma S, Jain SK, Singh B, Gupta BD, Satti NK, Koul S, Khan IA, Kumar A, Bharate SB, Vishwakarma RA Publication Year :
2014 Journal : MedChemComm DOI : 10.1039/C4MD00196F
PF-04995274
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate at 3 uM
Liver
Inhibition = 13.0 %
Reference
Title : Identification of multiple 5-HT₄ partial agonist clinical candidates for the treatment of Alzheimer's disease. Authors : Brodney MA, Johnson DE, Sawant-Basak A, Coffman KJ, Drummond EM, Hudson EL, Fisher KE, Noguchi H, Waizumi N, McDowell LL, Papanikolaou A, Pettersen BA, Schmidt AW, Tseng E, Stutzman-Engwall K, Rubitski DM, Vanase-Frawley MA, Grimwood S. Publication Year :
2012 Journal : J. Med. Chem. Abstract : The cognitive impairments observed in Alzheimer's disease (AD) are in part a consequence of reduced acetylcholine (ACh) levels resulting from a loss of cholinergic neurons. Preclinically, serotonin 4 receptor (5-HT(4)) agonists are reported to modulate cholinergic function and therefore may provide a new mechanistic approach for treating cognitive deficits associated with AD. Herein we communicate the design and synthesis of potent, selective, and brain penetrant 5-HT(4) agonists. The overall goal of the medicinal chemistry strategy was identification of structurally diverse clinical candidates with varying intrinsic activities. The exposure-response relationships between binding affinity, intrinsic activity, receptor occupancy, drug exposure, and pharmacodynamic activity in relevant preclinical models of AD were utilized as key selection criteria for advancing compounds. On the basis of their excellent balance of pharmacokinetic attributes and safety, two lead 5-HT(4) partial agonist candidates 2d and 3 were chosen for clinical development. DOI : 10.1021/jm300953p
PF-05105679
Inhibition of CYP2D6 (unknown origin) at 3 uM
—
Inhibition = 0.0 %
Reference
Title : Discovery of a Selective TRPM8 Antagonist with Clinical Efficacy in Cold-Related Pain. Authors : Andrews MD, Af Forselles K, Beaumont K, Galan SR, Glossop PA, Grenie M, Jessiman A, Kenyon AS, Lunn G, Maw G, Owen RM, Pryde DC, Roberts D, Tran TD. Publication Year :
2015 Journal : ACS Med. Chem. Lett. Abstract : The transient receptor potential (TRP) family of ion channels comprises nonselective cation channels that respond to a wide range of chemical and thermal stimuli. TRPM8, a member of the melastatin subfamily, is activated by cold temperatures (<28 °C), and antagonists of this channel have the potential to treat cold induced allodynia and hyperalgesia. However, TRPM8 has also been implicated in mammalian thermoregulation and antagonists have the potential to induce hypothermia in patients. We report herein the identification and optimization of a series of TRPM8 antagonists that ultimately led to the discovery of PF-05105679. The clinical finding with this compound will be discussed, including both efficacy and its ability to affect thermoregulation processes in humans. DOI : 10.1021/ml500479v
PRAVASTATIN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROCAINAMIDE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PROPAFENONE
Inhibition of CYP2D6 in human liver microsomes at 1 uM after 20 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 25.0 %
Reference
Title : Lead optimization of antimalarial propafenone analogues. Authors : Lowes D, Pradhan A, Iyer LV, Parman T, Gow J, Zhu F, Furimsky A, Lemoff A, Guiguemde WA, Sigal M, Clark JA, Wilson E, Tang L, Connelly MC, Derisi JL, Kyle DE, Mirsalis J, Guy RK. Publication Year :
2012 Journal : J. Med. Chem. Abstract : Previously reported studies identified analogues of propafenone that had potent antimalarial activity, reduced cardiac ion channel activity, and properties that suggested the potential for clinical development for malaria. Careful examination of the bioavailability, pharmacokinetics, toxicology, and efficacy of this series of compounds using rodent models revealed orally bioavailable compounds that are nontoxic and suppress parasitemia in vivo. Although these compounds possess potential for further preclinical development, they also carry some significant challenges. DOI : 10.1021/jm300286a
PROPAFENONE
Inhibition of CYP2D6 in human liver microsomes at 10 uM after 20 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 12.0 %
Reference
Title : Lead optimization of antimalarial propafenone analogues. Authors : Lowes D, Pradhan A, Iyer LV, Parman T, Gow J, Zhu F, Furimsky A, Lemoff A, Guiguemde WA, Sigal M, Clark JA, Wilson E, Tang L, Connelly MC, Derisi JL, Kyle DE, Mirsalis J, Guy RK. Publication Year :
2012 Journal : J. Med. Chem. Abstract : Previously reported studies identified analogues of propafenone that had potent antimalarial activity, reduced cardiac ion channel activity, and properties that suggested the potential for clinical development for malaria. Careful examination of the bioavailability, pharmacokinetics, toxicology, and efficacy of this series of compounds using rodent models revealed orally bioavailable compounds that are nontoxic and suppress parasitemia in vivo. Although these compounds possess potential for further preclinical development, they also carry some significant challenges. DOI : 10.1021/jm300286a
PROPRANOLOL
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
QUINIDINE
Inhibition of human recombinant CYP2D6 at 5 uM assessed as blockade of O-demethylation of dextromethorphan in to dextrophan by nanoscale automated in-capillary assay
—
Inhibition = 90.0 %
Reference
Title : Development of an in-capillary approach to nanoscale automated in vitro cytochromes p450 assays. Authors : Nicoli R, Curcio R, Rudaz S, Veuthey JL. Publication Year :
2009 Journal : J. Med. Chem. Abstract : A method to perform nanoscale automated CYP450-based drug metabolism studies using a capillary as a reaction vessel is described. In-capillary assays consumed only approximately 30 nL of recombinant human CYP450 solution. Ultrafast analysis of substrates and metabolites was achieved off-line by ultrahigh-pressure liquid chromatography coupled to mass spectrometry. This approach was successfully applied to qualitative metabolism studies of six major CYP450 isozymes and CYP2D6 inhibition experiments. DOI : 10.1021/jm900201b
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes assessed as bufuralol hydroxylation to 4'-hydroxybufuralol at 10 uM after 10 mins relative to control
Liver
Inhibition = 90.0 %
Reference
Title : Rational development of 4-aminopyridyl-based inhibitors targeting Trypanosoma cruzi CYP51 as anti-chagas agents. Authors : Choi JY, Calvet CM, Gunatilleke SS, Ruiz C, Cameron MD, McKerrow JH, Podust LM, Roush WR. Publication Year :
2013 Journal : J. Med. Chem. Abstract : A new series of 4-aminopyridyl-based lead inhibitors targeting Trypanosoma cruzi CYP51 (TcCYP51) has been developed using structure-based drug design as well as structure-property relationship (SPR) analyses. The screening hit starting point, LP10 (KD ≤ 42 nM; EC50 = 0.65 μM), has been optimized to give the potential leads 14t, 27i, 27q, 27r, and 27t, which have low-nanomolar binding affinity to TcCYP51 and significant activity against T. cruzi amastigotes cultured in human myoblasts (EC50 = 14-18 nM for 27i and 27r). Many of the optimized compounds have improved microsome stability, and most are selective against human CYPs 1A2, 2D6, and 3A4 (<50% inhibition at 1 μM). A rationale for the improvement in microsome stability and selectivity of inhibitors against human metabolic CYP enzymes is presented. In addition, the binding mode of 14t with the Trypanosoma brucei CYP51 (TbCYP51) orthologue has been characterized by X-ray structure analysis. DOI : 10.1021/jm401067s
QUINIDINE
Inhibition of CYP2D6 (unknown origin) at 10 uM relative to control
—
Inhibition = 95.07 %
Reference
Title : Potent Hepatitis C Virus NS5A Inhibitors Containing a Benzidine Core. Authors : Bae IH, Choi JK, Chough C, Keum SJ, Kim H, Jang SK, Kim BM. Publication Year :
2014 Journal : ACS Med. Chem. Lett. Abstract : Here we report the discovery of a series of potent hepatitis C virus (HCV) NS5A inhibitors based on the benzidine prolinamide backbone. Taking a simple synthetic route, we developed a novel inhibitor structure, which allows easy modification, and through optimization of the capping group, we identified compound 6 with highly potent anti-HCV activity. Compound 6 is nontoxic and is anticipated to be an effective HCV drug candidate. DOI : 10.1021/ml4003293
QUINIDINE
Inhibition of human CYP2D6 at 10 uM
—
Inhibition = 88.0 %
Reference
Title : Development of (E)-2-((1,4-dimethylpiperazin-2-ylidene)amino)-5-nitro-N-phenylbenzamide, ML336: Novel 2-amidinophenylbenzamides as potent inhibitors of venezuelan equine encephalitis virus. Authors : Schroeder CE, Yao T, Sotsky J, Smith RA, Roy S, Chu YK, Guo H, Tower NA, Noah JW, McKellip S, Sosa M, Rasmussen L, Smith LH, White EL, Aubé J, Jonsson CB, Chung D, Golden JE. Publication Year :
2014 Journal : J. Med. Chem. Abstract : Venezuelan equine encephalitis virus (VEEV) is an emerging pathogenic alphavirus that can cause significant disease in humans. Given the absence of therapeutic options available and the significance of VEEV as a weaponized agent, an optimization effort was initiated around a quinazolinone screening hit 1 with promising cellular antiviral activity (EC50 = 0.8 μM), limited cytotoxic liability (CC50 > 50 μM), and modest in vitro efficacy in reducing viral progeny (63-fold at 5 μM). Scaffold optimization revealed a novel rearrangement affording amidines, specifically compound 45, which was found to potently inhibit several VEEV strains in the low nanomolar range without cytotoxicity (EC50 = 0.02-0.04 μM, CC50 > 50 μM) while limiting in vitro viral replication (EC90 = 0.17 μM). Brain exposure was observed in mice with 45. Significant protection was observed in VEEV-infected mice at 5 mg kg(-1) day(-1) and viral replication appeared to be inhibited through interference of viral nonstructural proteins. DOI : 10.1021/jm501203v
QUINIDINE
Inhibition of recombinant human CYP2D6 preincubated at 10 uM for 5 mins before fluorescent substrate addition by fluorescence assay
—
Inhibition = 21.2 %
Reference
Title : Synthesis and biological evaluation of 3-phenethylazetidine derivatives as triple reuptake inhibitors. Authors : Yun J, Han M, Song C, Cheon SH, Choi K, Hahn HG. Publication Year :
2014 Journal : Bioorg. Med. Chem. Lett. Abstract : We report the synthesis of 3-phenethylazetidine derivatives 2 and their biological activities against 5-HT, NE and DA transporters as well as microsomal stability, CYP inhibition, and hERG inhibition profiles. Compound 2at showed most potent triple reuptake inhibitor with good selectivity as a candidate for depression. DOI : 10.1016/j.bmcl.2014.06.026
QUINIDINE
Inhibition of CYP2D6 (unknown origin) at 1 uM by luminescent readout-based method
—
Inhibition = 96.25 %
Reference
Title : Phenoxymethyl 1,3-oxazoles and 1,2,4-oxadiazoles as potent and selective agonists of free fatty acid receptor 1 (GPR40). Authors : Zahanich I, Kondratov I, Naumchyk V, Kheylik Y, Platonov M, Zozulya S, Krasavin M. Publication Year :
2015 Journal : Bioorg. Med. Chem. Lett. Abstract : A screening hit that showed a weak (EC50 = 18 μM), partial agonistic effect on GPR40 was used a prototype for expedited hit expansion effort using a set of advanced building blocks. The latter yielded several 1,3-oxazoles and 1,2,4-oxadiazoles with significantly improved potency (best EC50 = 0.058 μM). The lead compounds in each chemotype showed a very good ADME profile (aqueous solubility, plasma protein binding, microsomal stability and membrane permeability) and no appreciable inhibition of key cytochromes P450. The compounds reported are significant new starting points for further preclinical development of future diabetic agents with a mechanism of action for which a first-in-class agent is yet to be approved. DOI : 10.1016/j.bmcl.2015.06.018
QUINIDINE
Inhibition of CYP2D6 (unknown origin) at 1 uM by P450-glo assay
—
Inhibition = 96.25 %
Reference
Title : Novel free fatty acid receptor 1 (GPR40) agonists based on 1,3,4-thiadiazole-2-carboxamide scaffold. Authors : Krasavin M, Lukin A, Zhurilo N, Kovalenko A, Zahanich I, Zozulya S, Moore D, Tikhonova IG. Publication Year :
2016 Journal : Bioorg. Med. Chem. Abstract : Free fatty acid receptor 1 (FFA1), previously known as GPR40 is a G protein-coupled receptor and a new target for treatment of type 2 diabetes. Two series of FFA1 agonists utilizing a 1,3,4-thiadiazole-2-caboxamide scaffold were synthetized. Both series offered significant improvement of the potency compared to the previously described 1,3,4-thiadiazole-based FFA1 agonists and high selectivity for FFA1. Molecular docking predicts new aromatic interactions with the receptor that improve agonist potency. The most potent compounds from both series were profiled for in vitro ADME properties (plasma and metabolic stability, LogD, plasma protein binding, hERG binding and CYP inhibition). One series suffered very rapid degradation in plasma and in presence of mouse liver microsomes. However, the other series delivered a lead compound that displayed a reasonable ADME profile together with the improved FFA1 potency. DOI : 10.1016/j.bmc.2016.04.065
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using bufuralol as substrate at 10 uM preincubated for 5 mins followed by NADPH addition measured after 10 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 93.0 %
Reference
Title : Potent and Selective Human Neuronal Nitric Oxide Synthase Inhibition by Optimization of the 2-Aminopyridine-Based Scaffold with a Pyridine Linker. Authors : Wang HY, Qin Y, Li H, Roman LJ, Martásek P, Poulos TL, Silverman RB. Publication Year :
2016 Journal : J. Med. Chem. Abstract : Neuronal nitric oxide synthase (nNOS) is an important therapeutic target for the treatment of various neurodegenerative disorders. A major challenge in the design of nNOS inhibitors focuses on potency in humans and selectivity over other NOS isoforms. Here we report potent and selective human nNOS inhibitors based on the 2-aminopyridine scaffold with a central pyridine linker. Compound 14j, the most promising inhibitor in this study, exhibits excellent potency for rat nNOS (Ki = 16 nM) with 828-fold n/e and 118-fold n/i selectivity with a Ki value of 13 nM against human nNOS with 1761-fold human n/e selectivity. Compound 14j also displayed good metabolic stability in human liver microsomes, low plasma protein binding, and minimal binding to cytochromes P450 (CYPs), although it had little to no Caco-2 permeability. DOI : 10.1021/acs.jmedchem.6b00273
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes at 2 uM using dextromethorphan as substrate by LC-MS/MS analysis relative to control
Liver
Inhibition = 93.28 %
Reference
Title : Design, synthesis and biological evaluation of a series of novel GPR40 agonists containing nitrogen heterocyclic rings. Authors : Sun Z, Zhou T, Pan X, Yang Y, Huan Y, Xiao Z, Shen Z, Liu Z. Publication Year :
2018 Journal : Bioorg Med Chem Lett Abstract : A novel series of GPR40 agonists is designed by introducing nitrogen-containing heterocyclic ring at the terminal phenyl ring of TAK-875 with the aim of decreasing its lipophilicity. Three different β-substituted phenylpropionic acids were investigated as the acidic components. A total of 34 compounds have been synthesized, among which, compound 30 exhibited comparable GPR40 agonistic activity in vitro with TAK-875 and relatively lower lipophilicity through calculation (30, EC50 = 1.2 μM, cLogP = 1.3; TAK-875: EC50 = 5.1 μM, cLogP = 3.4). Moreover, compound 30 was able to enhance the insulin secretion of primary islets isolated from normal ICR mice and showed no obvious inhibition against cytochromes P450 in vitro. In vivo, compound 30 exhibited efficacy in oral glucose tolerance test (oGTT) in normal ICR mice. DOI : 10.1016/j.bmcl.2018.07.048
QUINIDINE
Inhibition of recombinant human CYP2D6 expressed in insect cell microsomes at 1 uM using Luciferin-ME EGE as substrate preincubated for 30 mins followed by NADPH addition measured after 45 mins by luminometric method
—
Inhibition = 91.0 %
Reference
Title : Hedgehog pathway inhibitors of the acylthiourea and acylguanidine class show antitumor activity on colon cancer in vitro and in vivo. Authors : Vesci L, Milazzo FM, Stasi MA, Pace S, Manera F, Tallarico C, Cini E, Petricci E, Manetti F, De Santis R, Giannini G. Publication Year :
2018 Journal : Eur J Med Chem Abstract : Small series of acylguanidine and acylthiourea derivatives were synthesized in gram-scale and assayed for their ability to modulate the Hh signalling pathway. In vitro studies showed a low micromolar inhibitory activity toward tumor cell lines, while the oral administration revealed an excellent ADME profile in vivo. Compound 5 emerged as the most active and safe inhibitor of colon cancer cells both in vitro and in a xenograft mouse model. Based on these data, 5 could be prioritized to further development with the perspective of clinical studies. DOI : 10.1016/j.ejmech.2018.07.053
QUINIDINE
Inhibition of human CYP2D6 in human liver microsomes at 50 times IC50 concentration relative to control
Liver
Inhibition = 97.9 %
Reference
Title : Synthesis and Biological Investigation of Phenothiazine-Based Benzhydroxamic Acids as Selective Histone Deacetylase 6 Inhibitors. Authors : Vögerl K, Ong N, Senger J, Herp D, Schmidtkunz K, Marek M, Müller M, Bartel K, Shaik TB, Porter NJ, Robaa D, Christianson DW, Romier C, Sippl W, Jung M, Bracher F. Publication Year :
2019 Journal : J Med Chem Abstract : The phenothiazine system was identified as a favorable cap group for potent and selective histone deacetylase 6 (HDAC6) inhibitors. Here, we report the preparation and systematic variation of phenothiazines and their analogues containing a benzhydroxamic acid moiety as the zinc-binding group. We evaluated their ability to selectively inhibit HDAC6 by a recombinant HDAC enzyme assay, by determining the protein acetylation levels in cells by western blotting (tubulin vs histone acetylation), and by assessing their effects on various cancer cell lines. Structure-activity relationship studies revealed that incorporation of a nitrogen atom into the phenothiazine framework results in increased potency and selectivity for HDAC6 (more than 500-fold selectivity relative to the inhibition of HDAC1, HDAC4, and HDAC8), as rationalized by molecular modeling and docking studies. The binding mode was confirmed by co-crystallization of the potent azaphenothiazine inhibitor with catalytic domain 2 from Danio rerio HDAC6. DOI : 10.1021/acs.jmedchem.8b01090
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes at 10 uM using dextromethorphan as substrate preincubated for 5 mins followed by NADPH addition and measured after 20 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 89.0 %
Reference
Title : Novel Tetrahydropyrido[4,3-d]pyrimidines as Potent Inhibitors of Chaperone Heat Shock Protein 90. Authors : Jiang F,Wang HJ,Jin YH,Zhang Q,Wang ZH,Jia JM,Liu F,Wang L,Bao QC,Li DD,You QD,Xu XL Publication Year :
2016 Journal : J Med Chem Abstract : Heat shock protein 90 (Hsp90) is a potential target for oncology therapeutics. Some inhibitors have shown antitumor effects in clinical trials, spurring the discovery of small molecule Hsp90 inhibitors. Here, we describe the structural optimization studies of a hit compound, tetrahydropyrido[4,3-d]pyrimidine-based Hsp90 inhibitor 15, which exhibits inhibitory activity against Hsp90. A series of analogues were synthesized, and their structure-activity and structure-property relationships were analyzed. These explorations led to the discovery of compound 73, which exhibited potent in vitro activities, good physicochemical properties, favorable ADME properties, and a potent antitumor effect in an HCT116 xenograft model. Furthermore, 73 exhibited no ocular toxicity in a rat retinal damage model, suggesting it is a relatively safe Hsp90 inhibitor. As a promising antitumor agent, 73 was progressed for further preclinical evaluation. DOI : 10.1021/acs.jmedchem.6b00912
QUINIDINE
Inhibition of CYP2D6 in human liver Microsome using dextromethorphan as substrate preincubated for 10 mins followed by NADPH addition and further incubated for 10 mins as substrate by LC-MS/MS analysis relative to control
Liver
Inhibition = 96.2 %
Reference
Title : Authors : Publication Year : Journal :
QUINIDINE
Inhibition of CYP2D6 (unknown origin) at 1 uM using dextromethorphan as substrate relative to control
—
Inhibition = 91.3 %
Reference
Title : Authors : Publication Year : Journal :
QUINIDINE
Inhibition of MAMC O-dealkylation mediated by human Cytochrome P450 2D6 expressed in human lymphoblastoid cell line
—
IC50 = 3.3 nM
Reference
Title : Homology modeling of rat and human cytochrome P450 2D (CYP2D) isoforms and computational rationalization of experimental ligand-binding specificities. Authors : Venhorst J, ter Laak AM, Commandeur JN, Funae Y, Hiroi T, Vermeulen NP. Publication Year :
2003 Journal : J. Med. Chem. Abstract : The ligand-binding characteristics of rat and human CYP2D isoforms, i.e., rat CYP2D1-4 and human CYP2D6, were investigated by measuring IC(50) values of 11 known CYP2D6 ligands using 7-methoxy-4-(aminomethyl)coumarin (MAMC) as substrate. Like CYP2D6, all rat CYP2D isozymes catalyzed the O-demethylation of MAMC with K(m) and V(max) values ranging between 78 and 145 microM and 0.048 and 1.122 min(-1), respectively. To rationalize observed differences in the experimentally determined IC(50) values, homology models of the CYP2D isoforms were constructed. A homology model of CYP2D6 was generated on the basis of crystallized rabbit CYP2C5 and was validated on its ability to reproduce binding orientations corresponding to metabolic profiles of the substrates and to remain stable during unrestrained molecular dynamics simulations at 300 K. Twenty-two active site residues, sharing up to 59% sequence identity, were identified in the CYP2D binding pockets and included CYP2D6 residues Phe120, Glu216, and Asp301. Electrostatic potential calculations displayed large differences in the negative charge of the CYP2D active sites, which was consistent with observed differences in absolute IC(50) values. MD studies on the binding mode of sparteine, quinidine, and quinine in CYP2D2 and CYP2D6 furthermore concurred well with experimentally determined IC(50) values and metabolic profiles. The current study thus provides new insights into differences in the active site topology of the investigated CYP2D isoforms. DOI : 10.1021/jm0209578
QUINIDINE
Inhibition of 1'-hydroxybufuralol formation by human liver microsomes
Liver
Ki = 40.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
QUINIDINE
Inhibitory effect on Bufuralol 1'-hydroxylation by human liver microsomes (Ki = apparent inhibition constant)
Liver
Ki = 80.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
QUINIDINE
Inhibition of partially purified cytochrome P450 2D6 1'-hydroxybufuralol formation
—
Ki = 43.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
QUINIDINE
Inhibitory constant for cytochrome P450 2D6
—
Ki = 60.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
QUINIDINE
Inhibition of human CYP2D6
—
IC50 = 20.0 nM
Reference
Title : Synthesis and evaluation of heteroaryl-substituted dihydronaphthalenes and indenes: potent and selective inhibitors of aldosterone synthase (CYP11B2) for the treatment of congestive heart failure and myocardial fibrosis. Authors : Voets M, Antes I, Scherer C, Müller-Vieira U, Biemel K, Marchais-Oberwinkler S, Hartmann RW. Publication Year :
2006 Journal : J. Med. Chem. Abstract : In this study, the synthesis and biological evaluation of heteroaryl-substituted dihydronaphthalenes and indenes (1-16) is described. The compounds were tested for activity by use of human CYP11B2 expressed in fission yeast and V79 MZh cells and for selectivity by use of human CYP11B1, CYP17, and CYP19. The most active inhibitor was the 6-methoxydihydronaphthalene 4 (IC(50) = 2 nM), showing a K(i) value of 1.3 nM and a competitive type of inhibition. The 5-methoxyindene 3 was found to be the most selective CYP11B2 inhibitor (IC(50) = 4 nM; CYP11B1 IC(50) = 5684 nM), which also showed only marginal inhibition of human CYP3A4 and CYP2D6. Docking and molecular dynamics studies using our homology-modeled CYP11B2 structure were performed to understand some structure-activity relationships. Caco-2 cell experiments revealed highly cell-permeable compounds, and metabolic studies with 4 using rat liver microsomes showed sufficient stability. DOI : 10.1021/jm060055x
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes
Liver
IC50 = 410.0 nM
Reference
Title : Identification and characterization of 4-methylbenzyl 4-[(pyrimidin-2-ylamino)methyl]piperidine-1-carboxylate, an orally bioavailable, brain penetrant NR2B selective N-methyl-D-aspartate receptor antagonist. Authors : Liverton NJ, Bednar RA, Bednar B, Butcher JW, Claiborne CF, Claremon DA, Cunningham M, DiLella AG, Gaul SL, Libby BE, Lyle EA, Lynch JJ, McCauley JA, Mosser SD, Nguyen KT, Stump GL, Sun H, Wang H, Yergey J, Koblan KS. Publication Year :
2007 Journal : J. Med. Chem. Abstract : The discovery of a novel series of NR2B subtype selective N-methyl-d-aspartate (NMDA) antagonists is reported. Initial optimization of a high-throughput screening lead afforded an aminopyridine derivative 13 with significant NR2B antagonist potency but limited selectivity over hERG-channel and other off-target activities. Further structure-activity studies on the aminoheterocycle moiety and optimization of the carbamate led to the highly potent 2-aminopyrimidine derivative 20j with a significantly improved off-target activity profile and oral bioavailability in multiple species coupled with good brain penetration. Compound 20j demonstrated efficacy in in vivo rodent models of antinociception, allodynia, and Parkinson's disease. DOI : 10.1021/jm060983w
QUINIDINE
Inhibition of human CYP2D6
—
IC50 = 11.0 nM
Reference
Title : Design, synthesis, and biological evaluation of (hydroxyphenyl)naphthalene and -quinoline derivatives: potent and selective nonsteroidal inhibitors of 17beta-hydroxysteroid dehydrogenase type 1 (17beta-HSD1) for the treatment of estrogen-dependent diseases. Authors : Frotscher M, Ziegler E, Marchais-Oberwinkler S, Kruchten P, Neugebauer A, Fetzer L, Scherer C, Müller-Vieira U, Messinger J, Thole H, Hartmann RW. Publication Year :
2008 Journal : J. Med. Chem. Abstract : Human 17beta-hydroxysteroid dehydrogenase type 1 (17beta-HSD1) catalyzes the reduction of the weak estrogen estrone (E1) to the highly potent estradiol (E2). This reaction takes place in the target cell where the estrogenic effect is exerted via the estrogen receptor (ER). Estrogens, especially E2, are known to stimulate the proliferation of hormone-dependent diseases. 17beta-HSD1 is overexpressed in many breast tumors. Thus, it is an attractive target for the treatment of these diseases. Ligand- and structure-based drug design led to the discovery of novel, selective, and potent inhibitors of 17beta-HSD1. Phenyl-substituted bicyclic moieties were synthesized as mimics of the steroidal substrate. Computational methods were used to obtain insight into their interactions with the protein. Compound 5 turned out to be a highly potent inhibitor of 17beta-HSD1 showing good selectivity (17beta-HSD2, ERalpha and beta), medium cell permeation, reasonable metabolic stability (rat hepatic microsomes), and little inhibition of hepatic CYP enzymes. DOI : 10.1021/jm701447v
QUINIDINE
Inhibition of human recombinant CYP2D6 expressed in insect microsomes
—
IC50 = 14.0 nM
Reference
Title : Overcoming undesirable CYP1A2 inhibition of pyridylnaphthalene-type aldosterone synthase inhibitors: influence of heteroaryl derivatization on potency and selectivity. Authors : Heim R, Lucas S, Grombein CM, Ries C, Schewe KE, Negri M, Müller-Vieira U, Birk B, Hartmann RW. Publication Year :
2008 Journal : J. Med. Chem. Abstract : Recently, we reported on the development of potent and selective inhibitors of aldosterone synthase (CYP11B2) for the treatment of congestive heart failure and myocardial fibrosis. A major drawback of these nonsteroidal compounds was a strong inhibition of the hepatic drug-metabolizing enzyme CYP1A2. In the present study, we examined the influence of substituents in the heterocycle of lead structures with a naphthalene molecular scaffold to overcome this unwanted side effect. With respect to CYP11B2 inhibition, some substituents induced a dramatic increase in inhibitory potency. The methoxyalkyl derivatives 22 and 26 are the most potent CYP11B2 inhibitors up to now (IC50 = 0.2 nM). Most compounds also clearly discriminated between CYP11B2 and CYP11B1, and the CYP1A2 potency significantly decreased in some cases (e.g., isoquinoline derivative 30 displayed only 6% CYP1A2 inhibition at 2 microM concentration). Furthermore, isoquinoline derivative 28 proved to be capable of passing the gastrointestinal tract and reached the general circulation after peroral administration to male Wistar rats. DOI : 10.1021/jm800377h
QUINIDINE
Inhibition of human recombinant CYP2D6 expressed in baculovirus-infected insect microsomes
—
IC50 = 14.0 nM
Reference
Title : Novel aldosterone synthase inhibitors with extended carbocyclic skeleton by a combined ligand-based and structure-based drug design approach. Authors : Lucas S, Heim R, Negri M, Antes I, Ries C, Schewe KE, Bisi A, Gobbi S, Hartmann RW. Publication Year :
2008 Journal : J. Med. Chem. Abstract : Pharmacophore modeling of a series of aldosterone synthase (CYP11B2) inhibitors triggered the design of compounds 11 and 12 by extending a previously established naphthalene molecular scaffold (e.g., present in molecules 1 and 2) via introduction of a phenyl or benzyl residue in 3-position. These additional aromatic moieties have been hypothesized to fit into the newly identified hydrophobic pharmacophore feature HY3. Subsequent docking studies in our refined CYP11B2 protein model have been performed prior to synthesis to estimate the inhibitory properties of the proposed molecules. While phenyl-substituted compound 11 (IC50 > 500 nM) did not dock under the given pharmacophore constraint (i.e., the Fe(heme)-N(ligand) interaction), benzyl-substituted compound 12 (IC50 = 154 nM) was found to exploit a previously unexplored subpocket of the inhibitor binding site. By structural optimization based on the pharmacophore hypothesis, 25 novel compounds were synthesized, among them highly potent CYP11B2 inhibitors (e.g., 17, IC50 = 2.7 nM) with pronounced selectivity toward the most important steroidogenic and hepatic CYP enzymes. DOI : 10.1021/jm800683c
QUINIDINE
Inhibition of human CYP2D6 expressed in baculovirus-infected insect cell system
—
IC50 = 19.6 nM
Reference
Title : Structure-activity relationship and studies on the molecular mechanism of leishmanicidal N,C-coupled arylisoquinolinium salts. Authors : Ponte-Sucre A, Gulder T, Wegehaupt A, Albert C, Rikanović C, Schaeflein L, Frank A, Schultheis M, Unger M, Holzgrabe U, Bringmann G, Moll H. Publication Year :
2009 Journal : J. Med. Chem. Abstract : Alternative drugs against leishmaniasis are desperately needed. Antimonials, the main chemotherapeutic tool, cause serious side effects and promote chemoresistance. We previously demonstrated that representatives of N,C-linked arylisoquinolines are promising leishmanicidal drug candidates. We now performed structure-activity relationship studies varying the aryl portion of our lead substrate. The new series of compounds show an enhanced selectivity against Leishmania major in comparison to their major host cell, the macrophage. Our results suggest that the arylisoquinolinium salts decrease the macrophage infection rate acting directly on the intracellular parasites. However, the activity of the 4'-i-propyl derivative might also involve the modulation of cytokine and nitric oxide production by host macrophages. Additionally, this isoquinoline acts synergistically with amphotericin B and does not interact with drug-metabolizing cytochrome P450 enzymes involved in the metabolism of antileishmanial drugs. The results demonstrate that the newly synthesized structurally simplified N,C-coupled arylisoquinolinium salts are promising candidates to be considered as leishmanicidal pharmacophores. DOI : 10.1021/jm801084u
QUINIDINE
Inhibition of human CYP2D6 by Lineweaver-Burke plot
—
Ki = 9.8 nM
Reference
Title : Structure-activity relationship and studies on the molecular mechanism of leishmanicidal N,C-coupled arylisoquinolinium salts. Authors : Ponte-Sucre A, Gulder T, Wegehaupt A, Albert C, Rikanović C, Schaeflein L, Frank A, Schultheis M, Unger M, Holzgrabe U, Bringmann G, Moll H. Publication Year :
2009 Journal : J. Med. Chem. Abstract : Alternative drugs against leishmaniasis are desperately needed. Antimonials, the main chemotherapeutic tool, cause serious side effects and promote chemoresistance. We previously demonstrated that representatives of N,C-linked arylisoquinolines are promising leishmanicidal drug candidates. We now performed structure-activity relationship studies varying the aryl portion of our lead substrate. The new series of compounds show an enhanced selectivity against Leishmania major in comparison to their major host cell, the macrophage. Our results suggest that the arylisoquinolinium salts decrease the macrophage infection rate acting directly on the intracellular parasites. However, the activity of the 4'-i-propyl derivative might also involve the modulation of cytokine and nitric oxide production by host macrophages. Additionally, this isoquinoline acts synergistically with amphotericin B and does not interact with drug-metabolizing cytochrome P450 enzymes involved in the metabolism of antileishmanial drugs. The results demonstrate that the newly synthesized structurally simplified N,C-coupled arylisoquinolinium salts are promising candidates to be considered as leishmanicidal pharmacophores. DOI : 10.1021/jm801084u
QUINIDINE
Inhibition of human liver microsome CYP2D6 in assessed as [14C]formaldehyde formation
Liver
IC50 = 82.0 nM
Reference
Title : Potent CYP3A4 inhibitory constituents of Piper cubeba. Authors : Usia T, Watabe T, Kadota S, Tezuka Y. Publication Year :
2005 Journal : J. Nat. Prod. Abstract : The EtOAc-soluble fraction of the water extract of Piper cubeba, having shown potent inhibitory activity on the metabolism mediated by CYP3A4, was subjected to activity-guided isolation to yield two new lignans, (8R,8'R)-4-hydroxycubebinone (1) and (8R,8'R,9'S)-5-methoxyclusin (2), and two new sesquiterpenes, (5 alpha,8 alpha)-2-oxo-1(10),3,7(11)-guaiatrien-12,8-olide (3) and (1 alpha,2 beta,5 alpha,8 alpha 10 alpha)-1,10-epoxy-2-hydroxy-3,7(11)-guaiadien-12,8-olide (4), along with 16 known compounds (5-20). The structures of the isolated compounds were elucidated on the basis of spectroscopic and chemical analyses. The isolated compounds were tested for their inhibitory activity on the metabolism mediated by CYP3A4 or CYP2D6 using [N-methyl-(14)C]erythromycin or [O-methyl-(14)C]dextromethorphan as a substrate, respectively. The compounds (8R,8'R,9'S)-5-methoxyclusin (2), (-)-clusin (10), (-)-yatein (13), ethoxyclusin (15), and (-)-dihydroclusin (17), having one methylenedioxyphenyl moiety in their structures, showed very potent and selective inhibitory activity against CYP3A4 with IC(50) values (0.44-1.0 microM) identical to that of the positive control, ketoconazole (IC(50), 0.72 microM). DOI : 10.1021/np0401765
QUINIDINE
Inhibition of human CYP2D6 by radiometric assay
—
IC50 = 78.0 nM
Reference
Title : Sesquiterpenes and flavonol glycosides from Zingiber aromaticum and their CYP3A4 and CYP2D6 inhibitory activities. Authors : Usia T, Iwata H, Hiratsuka A, Watabe T, Kadota S, Tezuka Y. Publication Year :
2004 Journal : J. Nat. Prod. Abstract : Three new sesquiterpenes, (2R,3S,5R)-2,3-epoxy-6,9-humuladien-5-ol-8-one (1), (2R,3R,5R)-2,3-epoxy-6,9-humuladien-5-ol-8-one (2), and (5R)-2,6,9-humulatrien-5-ol-8-one (3), and two new flavonol glycosides, kaempferol-3-O-(2,3-di-O-acetyl-alpha-l-rhamnopyranoside) (4) and kaempferol-3-O-(2,3,4-tri-O-acetyl-alpha-l-rhamnopyranoside) (5), were isolated from the EtOAc-soluble fraction of the water extract of Zingiber aromaticum, along with 13 known compounds (6-18). The structures of the isolated compounds were elucidated on the basis of spectroscopic and chemical analyses. The isolated compounds were tested for their inhibitory activity on the metabolism mediated by CYP3A4 or CYP2D6 using [N-methyl-(14)C]erythromycin or [O-methyl-(14)C]dextromethorphan as a substrate, respectively. Kaempferol-3-O-(2,3,4-tri-O-acetyl-alpha-l-rhamnopyranoside) (5) showed the most potent inhibitory activity (IC(50), 14.4 microM) on the metabolism mediated by CYP3A4, and kaempferol-3-O-methyl ether (14) inhibited CYP2D6 most potently (IC(50), 4.63 microM). DOI : 10.1021/np030556a
QUINIDINE
Inhibition of human CYP2D6
—
IC50 = 10.0 nM
Reference
Title : New drug-like hydroxyphenylnaphthol steroidomimetics as potent and selective 17β-hydroxysteroid dehydrogenase type 1 inhibitors for the treatment of estrogen-dependent diseases. Authors : Marchais-Oberwinkler S, Wetzel M, Ziegler E, Kruchten P, Werth R, Henn C, Hartmann RW, Frotscher M. Publication Year :
2011 Journal : J. Med. Chem. Abstract : Inhibition of 17β-hydroxysteroid dehydrogenase type 1 (17β-HSD1) is a novel and attractive approach to reduce the local levels of the active estrogen 17β-estradiol in patients with estrogen-dependent diseases like breast cancer or endometriosis. With the aim of optimizing the biological profile of 17β-HSD1 inhibitors from the hydroxyphenylnaphthol class, structural optimizations were performed at the 1-position of the naphthalene by introduction of different heteroaromatic rings as well as substituted phenyl groups. In the latter class of compounds, which were synthesized applying Suzuki-cross coupling, the 3-methanesulfonamide 15 turned out to be a highly potent 17β-HSD1 inhibitor (IC(50) = 15 nM in a cell-free assay). It was also very active in the cellular assay (T47D cells, IC(50) = 71 nM) and selective toward 17β-HSD2 and the estrogen receptors α and β. It showed a good membrane permeation and metabolic stability and was orally available in the rat. DOI : 10.1021/jm1009082
QUINIDINE
Inhibition of human CYP2D6 expressed in baculovirus-infected insect microsomes
—
IC50 = 14.0 nM
Reference
Title : Fine-tuning the selectivity of aldosterone synthase inhibitors: structure-activity and structure-selectivity insights from studies of heteroaryl substituted 1,2,5,6-tetrahydropyrrolo[3,2,1-ij]quinolin-4-one derivatives. Authors : Lucas S, Negri M, Heim R, Zimmer C, Hartmann RW. Publication Year :
2011 Journal : J. Med. Chem. Abstract : Pyridine substituted 3,4-dihydro-1H-quinolin-2-ones (e.g., 1-3) constitute a class of highly potent and selective inhibitors of aldosterone synthase (CYP11B2), a promising target for the treatment of hyperaldosteronism, congestive heart failure, and myocardial fibrosis. Among these, ethyl-substituted 3 possesses high selectivity against CYP1A2. Rigidification of 3 by incorporation of the ethyl group into a 5- or 6-membered ring affords compounds with a pyrroloquinolinone or pyridoquinolinone molecular scaffold (e.g., 4 and 5). It was found that these molecules are even more potent and selective CYP11B2 inhibitors than their corresponding open-chain analogues. Moreover, pyrroloquinolinone 4 exhibits no inhibition of the six most important hepatic CYP enzymes as well as a bioavailability in the range of the marketed drug fadrozole. The SAR studies disclose that subtle changes in the heterocyclic moiety are responsible for either a strong or a weak inhibition of the highly homologous 11β-hydroxylase (CYP11B1). These results are not only important for fine-tuning the selectivity of CYP11B2 inhibitors but also for the development of selective CYP11B1 inhibitors that are of interest for the treatment of Cushing's syndrome and metabolic syndrome. DOI : 10.1021/jm101470k
QUINIDINE
Inhibition of human recombinant microsomal CYP2D6 using {3-[2-(N,N-diethyl-N-methylamino)ethyl]-7-methoxy-4-methylcoumarin} as substrate assessed as remaining activity at 10 uM after 30 mins by spectrofluorimetric analysis relative to control
—
IC50 = 2.0 nM
Reference
Title : New serotonin 5-HT1A receptor agonists endowed with antinociceptive activity in vivo. Authors : Valhondo M, Marco I, Martín-Fontecha M, Vázquez-Villa H, Ramos JA, Berkels R, Lauterbach T, Benhamú B, López-Rodríguez ML. Publication Year :
2013 Journal : J. Med. Chem. Abstract : We report the synthesis of new compounds 4-35 based on two different openings (A and B) of the chromane ring present in the previously identified 5-HT1A receptor (5-HT1AR) ligand 3. The synthesized compounds were assessed for binding affinity, selectivity, and functional activity at the 5-HT1AR. Selected candidates resulting from B opening were also evaluated for their potential antinociceptive effect in vivo and pharmacokinetic properties in vitro. Analogue 19 [2-(4-{[2-(2-ethoxyphenoxy)ethyl]amino}butyl)tetrahydro-1H-pyrrolo[1,2-c]imidazole-1,3(2H)-dione] has been characterized as a high-affinity and potent 5-HT1AR agonist (Ki = 2.3 nM; EC50 = 19 nM). Pharmacokinetic studies indicated that compound 19 displays a good metabolic stability in human liver microsomes (t1/2 ∼ 3 h and CLint = 3.5 mL/min/kg, at 5 μM), and a low level of protein binding (25%, at 5 μM). Interestingly, 19 (3 mg/kg, ip, and 30 mg/kg, po) caused significant attenuation of formalin-induced behavior in early and late phases of the mouse intradermal formalin test of pain, and this in vivo effect was reversed by the selective 5-HT1AR antagonist WAY-100635. Thus, the new 5-HT1AR agonist identified in this work, 19, exhibits oral analgesic activity, and the results herein represent a step toward identifying new therapeutics for the control of pain. DOI : 10.1021/jm400766k
QUINIDINE
Inhibition of recombinant CYP2D6 (unknown origin) using 7-methoxy-4-trifluoromethylcoumarin as substrate
—
IC50 = 17.0 nM
Reference
Title : Investigation of a novel series of 2-hydroxyisoquinoline-1,3(2H,4H)-diones as human immunodeficiency virus type 1 integrase inhibitors. Authors : Suchaud V, Bailly F, Lion C, Calmels C, Andréola ML, Christ F, Debyser Z, Cotelle P. Publication Year :
2014 Journal : J. Med. Chem. Abstract : We report herein further insight into the biological activities displayed by a series of 2-hydroxyisoquinoline-1,3(2H,4H)-diones (HIDs). Substitution of the N-hydroxyimide two-metal binding pharmacophore at position 4 by carboxamido side chains was previously shown by us to be fruitful for this scaffold, since strong human immunodeficiency virus type 1 integrase (HIV-1 IN) inhibitors in the low nanomolar range associated with low micromolar anti-HIV activities were obtained. We investigated the influence of substitution at position 7 on biological activity. Introduction of electron-withdrawing functional groups such as the nitro moiety at position 7 led to a noticeable improvement of antiviral activity, down to low nanomolar anti-HIV potencies, with advantageous therapeutic indexes going close to those of the clinically used raltegravir and retained potencies against a panel of IN mutants. DOI : 10.1021/jm500109z
QUINIDINE
Inhibition of CYP2D6 (unknown origin) using AMMC by fluorescence assay
—
IC50 = 120.0 nM
Reference
Title : Chemical synthesis, cytotoxicity, selectivity and bioavailability of 5α-androstane-3α,17β-diol derivatives. Authors : Ayan D, Maltais R, Hospital A, Poirier D. Publication Year :
2014 Journal : Bioorg. Med. Chem. Abstract : Aminosteroid derivatives represent a new family of compounds with promising antiproliferative activity over different cancer cell lines. Among all the aminosteroid derivatives synthesised in our laboratory, we have identified E-37P as one of the more potent when tested in vitro. Unfortunately, the pharmacokinetic properties of E-37P decrease its effectiveness when tested in vivo. To improve the bioavailability and increase the efficiency of aminosteroid E-37P, two series of analog compounds were synthesised by classic chemical synthesis, they were then characterized, and the concentration that inhibits 50% of cell proliferation (IC50) was determined on different cell lines. RM-133, a 5α-androstane-3α,17β-diol derivative with a quinoline nucleus at the end of the piperazine-proline side-chain at position 2β and an ethinyl at position 17α, showed very good antiproliferative activity among the five cancer cell lines studied (IC50=0.1, 0.1, 0.1, 2.0 and 1.1 μM for HL-60, MCF-7, T-47D, LNCaP and WEHI-3, respectively). Moreover, the plasmatic concentration of RM-133 at 3h, when injected subcutaneously in rats, was 2.3-fold higher than that of E-37P (151 vs 64.8 ng/mL). Furthermore, RM-133 weakly inhibited the two representative liver enzymes, CYP3A4 and CYP2D6, indicating a very low risk of drug-drug interactions. The cytotoxicity of RM-133 against normal cells was tested on peripheral blood lymphocytes (PBL) obtained from different donors and previously activated with phytohemagglutinin-L. PBL responded differently to treatment with RM-133, we observed a stimulation of cell proliferation and/or cytotoxicity in a dose-dependent manner. Based on these results, additional studies are currently underway to evaluate the selectivity of our lead compound against normal cell lines in a more detailed fashion. DOI : 10.1016/j.bmc.2014.09.026
QUINIDINE
Inhibition of CYP2D6 in human liver microsome
Liver
IC50 < 6.0 nM
Reference
Title : Discovery of novel pyrimidine and malonamide derivatives as TGR5 agonists. Authors : Park EJ, Ahn YG, Jung SH, Bang HJ, Kim M, Hong DJ, Kim J, Suh KH, Kim YJ, Kim D, Kim EY, Lee K, Min KH. Publication Year :
2014 Journal : Bioorg. Med. Chem. Lett. Abstract : Takeda G-protein-coupled receptor 5 (TGR5) is a promising molecular target for metabolic diseases. A series of 4-(2,5-dichlorophenoxy)pyrimidine and cyclopropylmalonamide derivatives were synthesized as potent agonists of TGR5 based on a bioisosteric replacement strategy. Several compounds exhibited improved potency, compared to a reference compound with a pyridine scaffold. The pharmacokinetic profile of the representative compound 18 was considered moderate. DOI : 10.1016/j.bmcl.2014.07.026
QUINIDINE
Inhibition of CYP2D6 (unknown origin)
—
IC50 = 18.0 nM
Reference
Title : 4-Fluoro-3',4',5'-trimethoxychalcone as a new anti-invasive agent. From discovery to initial validation in an in vivo metastasis model. Authors : Roman BI, De Ryck T, Patronov A, Slavov SH, Vanhoecke BW, Katritzky AR, Bracke ME, Stevens CV. Publication Year :
2015 Journal : Eur. J. Med. Chem. Abstract : Invasion and metastasis are responsible for 90% of cancer-related mortality. Herein, we report on our quest for novel, clinically relevant inhibitors of local invasion, based on a broad screen of natural products in a phenotypic assay. Starting from micromolar chalcone hits, a predictive QSAR model for diaryl propenones was developed, and synthetic analogues with a 100-fold increase in potency were obtained. Two nanomolar hits underwent efficacy validation and eADMET profiling; one compound was shown to increase the survival time in an artificial metastasis model in nude mice. Although the molecular mechanism(s) by which these substances mediate efficacy remain(s) unrevealed, we were able to eliminate the major targets commonly associated with antineoplastic chalcones. DOI : 10.1016/j.ejmech.2015.06.029
QUINIDINE
Inhibition of CYP2D6 (unknown origin) using luciferin tagged substrate preincubated for 10 mins before substrate addition
—
IC50 = 30.0 nM
Reference
Title : Discovery of potent and selective cytotoxic activity of new quinazoline-ureas against TMZ-resistant glioblastoma multiforme (GBM). Authors : Elkamhawy A, Viswanath AN, Pae AN, Kim HY, Heo JC, Park WK, Lee CO, Yang H, Kim KH, Nam DH, Seol HJ, Cho H, Roh EJ. Publication Year :
2015 Journal : Eur. J. Med. Chem. Abstract : Herein, we report new quinazoline-urea based compounds with potent cytotoxic activities against TMZ-resistant glioblastoma multiforme (GBM) cells. Low micromolar IC₅₀ values were exhibited over a panel of three primary GBM patient-derived cell cultures belonging to proneural (GBM-1), mesenchymal (GBM-2), and classical (GBM-3) subtypes. Eight compounds showed excellent selectivity indices for GBM cells comparing to a normal astrocyte cell line. In JC-1 assay, analogues 11, 12, 20, 22, and 24 exerted promising rates of mPTP opening induction towards proneural GBM subtype. Compounds 11, 20, and 24 bound to the translocator protein 18 kDa (TSPO) in submicromolar range using [(3)H] PK-11195 binding affinity assay. A homology model was built and docked models of 11, 12, 20, 22 and 24 were generated for describing their plausible binding modes in TSPO. In 3D clonogenic assay, compound 20 manifested potent tumoricidal effects on TMZ-resistant GBM cells even at submicromolar concentrations. In addition, CYP450 and hERG assays presented a safe toxicity profile of 20. Taken as a whole, this report presents compound 20 as a potent, selective and safe GBM cytotoxic agent which constitutes a promising direction against TMZ-resistant GBM. DOI : 10.1016/j.ejmech.2015.08.001
QUINIDINE
Inhibition of human recombinant CYP2D6 using MFC as substrate incubated for 40 mins by fluorimetry
—
IC50 = 17.0 nM
Reference
Title : 2-hydroxyisoquinoline-1,3(2H,4H)-diones (HIDs) as human immunodeficiency virus type 1 integrase inhibitors: Influence of the alkylcarboxamide substitution of position 4. Authors : Billamboz M, Suchaud V, Bailly F, Lion C, Andréola ML, Christ F, Debyser Z, Cotelle P. Publication Year :
2016 Journal : Eur. J. Med. Chem. Abstract : Herein, we report further insight into the biological activities displayed by the 2-hydroxyisoquinoline-1,3(2H,4H)-dione (HID) scaffold. Previous studies have evidenced the marked fruitful effect of substitution of this two-metal binding pharmacophore at position 4 by phenyl and benzyl carboxamido chains. Strong human immunodeficiency virus type 1 integrase (HIV-1 IN) inhibitors in the low nanomolar range with micromolar (even down to low nanomolar) anti-HIV activities were obtained. Keeping this essential 4-carboxamido function, we investigated the influence of the replacement of phenyl and benzyl groups by various alkyl chains. This study shows that the recurrent halogenobenzyl pharmacophore found in the INSTIs can be efficiently replaced by an n-alkyl group. With an optimal length of six carbons, we observed a biological profile and a high barrier to resistance equivalent to those of a previously reported hit compound bearing a 4-fluorobenzyl group. DOI : 10.1016/j.ejmech.2016.03.083
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate after 10 mins by LC-MS analysis
Liver
IC50 = 9.0 nM
Reference
Title : Understanding Oxadiazolothiazinone Biological Properties: Negative Inotropic Activity versus Cytochrome P450-Mediated Metabolism. Authors : Carosati E, Cosimelli B, Ioan P, Severi E, Katneni K, Chiu FC, Saponara S, Fusi F, Frosini M, Matucci R, Micucci M, Chiarini A, Spinelli D, Budriesi R. Publication Year :
2016 Journal : J. Med. Chem. Abstract : We present a series of oxadiazolothiazinones, selective inotropic agents on isolated cardiac tissues, devoid of chronotropy and vasorelaxant activity. Functional and binding data for the precursor of the series (compound 1) let us hypothesize LTCC blocking activity and the existence of a recognition site specific for this scaffold. We synthesized and tested 22 new derivatives: introducing a para-methoxyphenyl at C-8 led to compound 12 (EC50 = 0.022 μM), twice as potent as its para-bromo analogue (1). For 10 analogues, we extended the characterization of the biological properties by including the assessment of metabolic stability in human liver microsomes and cytochrome P450 inhibition potential. We observed that the methoxy group led to active compounds with low metabolic stability and high CYP inhibition, whereas the protective effect of bromine resulted in enhanced metabolic stability and reduced CYP inhibition. Thus, we identified two para-bromo benzothiazino-analogues as candidates for further studies. DOI : 10.1021/acs.jmedchem.6b00030
QUINIDINE
Inhibition of recombinant human CYP2D6 by P450-Glo luminescence assay
—
IC50 = 60.0 nM
Reference
Title : 2-(3-Methoxyphenyl)quinazoline Derivatives: A New Class of Direct Constitutive Androstane Receptor (CAR) Agonists. Authors : Smutny T, Nova A, Drechslerová M, Carazo A, Hyrsova L, Hrušková ZR, Kuneš J, Pour M, Špulák M, Pavek P. Publication Year :
2016 Journal : J. Med. Chem. Abstract : Constitutive androstane receptor (CAR) is a key regulator of xenobiotic and endobiotic metabolism. Together with pregnane X (PXR) and aryl hydrocarbon (AHR) receptors, it is referred to as "xenobiotic receptor". The unique properties of human CAR, such as its high constitutive activity, both direct (ligand-binding domain-dependent) and indirect activation have hindered the discovery of direct selective human CAR ligands. Herein, we report a novel class of direct human CAR agonists in a group of 2-(3-methoxyphenyl)quinazoline derivatives. The compounds are even more potent activators of human CAR than is prototype 6-(4-chlorophenyl)imidazo[2,1-b][1,3]thiazole-5-carbaldehyde O-(3,4-dichlorobenzyl)oxime (CITCO). The three most potent ligands are at the same time extremely potent activators of the other xenobiotic or hormonal receptors, namely PXR, AHR, and vitamin D receptor, which regulate major xenobiotic-metabolizing enzymes and efflux transporters. Thus, the novel CAR ligands can be also considered as constituting the first class of potent pan-xenobiotic receptor ligands that can serve as potential antidotes boosting overall metabolic elimination of xenobiotic or toxic compounds. DOI : 10.1021/acs.jmedchem.5b01891
QUINIDINE
Inhibition of CYP2D6 in pooled human hepatic microsomes using dextromethorphan substrate in presence of NADPH
Liver
IC50 = 41.3 nM
Reference
Title : Discovery and Optimization of 1-Phenoxy-2-aminoindanes as Potent, Selective, and Orally Bioavailable Inhibitors of the Na+/H+ Exchanger Type 3 (NHE3). Authors : Rackelmann N, Matter H, Englert H, Follmann M, Maier T, Weston J, Arndt P, Heyse W, Mertsch K, Wirth K, Bialy L. Publication Year :
2016 Journal : J Med Chem Abstract : The design, synthesis, and structure-activity relationship of 1-phenoxy-2-aminoindanes as inhibitors of the Na+/H+ exchanger type 3 (NHE3) are described based on a hit from high-throughput screening (HTS). The chemical optimization resulted in the discovery of potent, selective, and orally bioavailable NHE3 inhibitors with 13d as best compound, showing high in vitro permeability and lacking CYP2D6 inhibition as main optimization parameters. Aligning 1-phenoxy-2-aminoindanes onto the X-ray structure of 13d then provided 3D-QSAR models for NHE3 inhibition capturing guidelines for optimization. These models showed good correlation coefficients and allowed for activity estimation. In silico ADMET models for Caco-2 permeability and CYP2D6 inhibition were also successfully applied for this series. Moreover, docking into the CYP2D6 X-ray structure provided a reliable alignment for 3D-QSAR models. Finally 13d, renamed as SAR197, was characterized in vitro and by in vivo pharmacokinetic (PK) and pharmacological studies to unveil its potential for reduction of obstructive sleep apneas. DOI : 10.1021/acs.jmedchem.6b00624
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate preincubated for 10 mins followed by NADPH addition measured after 10 mins by LC/MS/MS method
Liver
IC50 = 151.0 nM
Reference
Title : Discovery of biphenyl imidazole derivatives as potent antifungal agents: Design, synthesis, and structure-activity relationship studies. Authors : Zhao D, Zhao S, Zhao L, Zhang X, Wei P, Liu C, Hao C, Sun B, Su X, Cheng M. Publication Year :
2017 Journal : Bioorg Med Chem Abstract : Fungal infections have became a serious medical problem due to their high incidence and mortality. We describe the discovery and structure-activity relationships studies (SARs) of a series of novel biphenyl imidazole derivatives with excellent antifungal activities against Candida albicans and Cryptococcus neoformans. The most promising compounds 12f-g and 19a-b exhibited excellent activity with minimum inhibitory concentration (MIC) values in the range of 0.03125-2μg/mL. Preliminary mechanism studies showed that the potent antifungal activity of compound 12g stemed from inhibition of CYP51 in Candida albicans. Furthermore, compounds 12g and 19b exhibited low inhibition profiles for various human cytochrome P450 isoforms. The SARs and binding mode established in this study will be useful for further lead optimization. DOI : 10.1016/j.bmc.2016.11.051
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using bufuralol as substrate after 5 to 15 mins
Liver
IC50 = 35.0 nM
Reference
Title : Discovery of GBT440, an Orally Bioavailable R-State Stabilizer of Sickle Cell Hemoglobin. Authors : Metcalf B, Chuang C, Dufu K, Patel MP, Silva-Garcia A, Johnson C, Lu Q, Partridge JR, Patskovska L, Patskovsky Y, Almo SC, Jacobson MP, Hua L, Xu Q, Gwaltney SL, Yee C, Harris J, Morgan BP, James J, Xu D, Hutchaleelaha A, Paulvannan K, Oksenberg D, Li Z. Publication Year :
2017 Journal : ACS Med Chem Lett Abstract : We report the discovery of a new potent allosteric effector of sickle cell hemoglobin, GBT440 (36), that increases the affinity of hemoglobin for oxygen and consequently inhibits its polymerization when subjected to hypoxic conditions. Unlike earlier allosteric activators that bind covalently to hemoglobin in a 2:1 stoichiometry, 36 binds with a 1:1 stoichiometry. Compound 36 is orally bioavailable and partitions highly and favorably into the red blood cell with a RBC/plasma ratio of ∼150. This partitioning onto the target protein is anticipated to allow therapeutic concentrations to be achieved in the red blood cell at low plasma concentrations. GBT440 (36) is in Phase 3 clinical trials for the treatment of sickle cell disease (NCT03036813). DOI : 10.1021/acsmedchemlett.6b00491
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate preincubated for 10 mins followed by NADPH addition measured after 10 mins by LC/MS/MS analysis
Liver
IC50 = 135.0 nM
Reference
Title : Design, synthesis and evaluation of aromatic heterocyclic derivatives as potent antifungal agents. Authors : Zhao S, Zhang X, Wei P, Su X, Zhao L, Wu M, Hao C, Liu C, Zhao D, Cheng M. Publication Year :
2017 Journal : Eur J Med Chem Abstract : To further enhance the anti-Aspergillus efficacy of our previously discovered antifungal lead compounds (1), a series of aromatic heterocyclic derivatives were designed, synthesized and evaluated for in vitro antifungal activity. Many of the target compounds showed good inhibitory activity against Candida albicans and Cryptococcus neoformans. In particular, the isoxazole nuclei were more suited for improving the activity against Aspergillus spp. Among these compounds, 2-F substituted analogues 23g and 23h displayed the most remarkable in vitro activity against Candida spp., C. neoformans, A. fumigatus and fluconazole-resistant C.alb. strains, which is superior or comparable to the activity of the reference drugs fluconazole and voriconazole. Notably, the compounds 23g and 23h exhibited low inhibition profiles for various isoforms of human cytochrome P450 and excellent blood plasma stability. DOI : 10.1016/j.ejmech.2017.05.043
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes assessed as dextromethorphan O-demethylation after 4 to 40 mins in presence of NADPH by LCMS analysis
Liver
IC50 = 25.0 nM
Reference
Title : Synthesis and profiling of benzylmorpholine 1,2,4,5-tetraoxane analogue N205: Towards tetraoxane scaffolds with potential for single dose cure of malaria. Authors : O' Neill PM, Stocks PA, Sabbani S, Roberts NL, Amewu RK, Shore ER, Aljayyoussi G, Angulo-Barturén I, Belén M, Jiménez-Díaz, Bazaga SF, Martínez MS, Campo B, Sharma R, Charman SA, Ryan E, Chen G, Shackleford DM, Davies J, Nixon GL, Biagini GA, Ward SA. Publication Year :
2018 Journal : Bioorg Med Chem Abstract : A series of aryl carboxamide and benzylamino dispiro 1,2,4,5-tetraoxane analogues have been designed and synthesized in a short synthetic sequence from readily available starting materials. From this series of endoperoxides, molecules with in vitro IC50s versus Plasmodium falciparum (3D7) as low as 0.84 nM were identified. Based on an assessment of blood stability and in vitro microsomal stability, N205 (10a) was selected for rodent pharmacokinetic and in vivo antimalarial efficacy studies in the mouse Plasmodium berghei and Plasmodium falciparum Pf3D70087/N9 severe combined immunodeficiency (SCID) mouse models. The results indicate that the 4-benzylamino derivatives have excellent profiles with a representative of this series, N205, an excellent starting point for further lead optimization studies. DOI : 10.1016/j.bmc.2018.05.006
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate preincubated for 10 mins followed by NADPH addition measured after 10 mins by LC-MS/MS analysis
Liver
IC50 = 118.0 nM
Reference
Title : Design, synthesis and evaluation of benzoheterocycle analogues as potent antifungal agents targeting CYP51. Authors : Zhao S, Wei P, Wu M, Zhang X, Zhao L, Jiang X, Hao C, Su X, Zhao D, Cheng M. Publication Year :
2018 Journal : Bioorg Med Chem Abstract : To further enhance the anti-Aspergillus efficacy of our previously discovered antifungal lead compound 1, a series of benzoheterocycle analogues were designed, synthesized and evaluated for their in vitro antifungal activity. The most promising compounds 13s and 14a exhibited excellent antifungal activity against C. albicans, C. neoformans, A. fumigatus and fluconazole-resistant C. albicans strains, that was superior or comparable to those of the reference drugs fluconazole and voriconazole. GC-MS analyses suggested that the novel compound 13s might have a similar mechanism to fluconazole by inhibiting fungal lanosterol 14α-demethylase (CYP51). Furthermore, compounds 13s and 14a exhibited low inhibition profiles for various human cytochrome P450 isoforms as well as excellent blood plasma stability. DOI : 10.1016/j.bmc.2018.04.054
QUINIDINE
Inhibition of CYP2D6 in pooled human liver microsomes pre-incubated for 5 mins before NADPH addition and measured after 10 mins by UPLC-MS/MS analysis relative to control
Liver
IC50 = 78.0 nM
Reference
Title : Discovery and Characterization of Potent Pan-Genotypic HCV NS5A Inhibitors Containing Novel Tricyclic Central Core Leading to Clinical Candidate. Authors : Ramdas V, Talwar R, Banerjee M, Joshi AA, Das AK, Walke DS, Borhade P, Dhayagude U, Loriya R, Gote G, Bommakanti A, Sivaram A, Agarwal G, Goswami A, Nigade P, Mehta M, Patil V, Modi D, Kumar H, Mallurwar S, Dash A, Modi F, Kuldharan S, Srivastava P, Singh M, Narasimham L, Gundu J, Sharma S, Kamboj RK, Palle VP. Publication Year :
2019 Journal : J Med Chem Abstract : The identification of a novel class of potent pan-genotypic NS5A inhibitors with good pharmacokinetic profile suitable for potential use in treating HCV infections is disclosed here. The present series of compounds are with less complex tricyclic central core, identified through a systematic SAR study carried out on biphenyl moiety. The SAR outcome has confirmed the requirement of near planar and linear conformation of the molecule to achieve the best pan-genotypic activity. In addition, SAR with substituted imidazoles on improvement of antiviral activity is disclosed. The newly identified compounds 12, 16, 19-21 have shown desirable pharmacokinetic profiles with a favorable uptake of compounds in liver and maintained a significant concentration for up to 8 h in the liver. In addition, compounds 20 and 21 have shown superior pan-genotypic anti-HCV activity compared to ledipasvir and daclatasvir. Additional characterization and preliminary safety assessment resulted in the identification of compound 20 as a potential clinical candidate. DOI : 10.1021/acs.jmedchem.9b01562
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan substrate incubated for 10 mins in presence of NADPH
Liver
IC50 = 156.0 nM
Reference
Title : Structure-Based Bioisosterism Yields HIV-1 NNRTIs with Improved Drug-Resistance Profiles and Favorable Pharmacokinetic Properties. Authors : Kang D, Feng D, Sun Y, Fang Z, Wei F, De Clercq E, Pannecouque C, Liu X, Zhan P. Publication Year :
2020 Journal : J Med Chem Abstract : The development of efficacious NNRTIs for AIDS therapy commonly encountered the rapid generation of drug-resistant mutations, which becomes a major impediment to effective anti-HIV treatment. Using a structure-based bioisosterism strategy, a series of piperidine-substituted thiophene[2,3-d]pyrimidine derivatives were designed and synthesized. Compound 9a yielded the greatest potency, exhibiting significantly better anti-HIV-1 activity than ETR against all of the tested NNRTI-resistant HIV-1 strains. In addition, the phenotypic (cross)resistance of 9a and other NRTIs to the different selected HIV-1 strains was evaluated. As expected, no phenotypic cross-resistance against the NRTIs (AZT and PMPA) was observed with the mutant 9ares strain. Furthermore, 9a was identified with improved solubility, lower CYP liability, and hERG inhibition. Remarkably, 9a exhibited optimal pharmacokinetic properties in rats (F = 37.06%) and safety in mice (LD50 > 2000 mg/kg), which highlights 9a as a promising anti-HIV-1 drug candidate. DOI : 10.1021/acs.jmedchem.0c00117
QUINIDINE
Inhibition of CYP2D6 (unknown origin) using beetle D-luciferin as substrate by CYP450-Glo assay
—
IC50 = 10.0 nM
Reference
Title : Search for a 5-CT alternative. In vitro and in vivo evaluation of novel pharmacological tools: 3-(1-alkyl-1H-imidazol-5-yl)-1H-indole-5-carboxamides, low-basicity 5-HT7 receptor agonists. Authors : Latacz G, Hogendorf AS, Hogendorf A, Lubelska A, Wierońska JM, Woźniak M, Cieślik P, Kieć-Kononowicz K, Handzlik J, Bojarski AJ. Publication Year :
2018 Journal : MedChemComm Abstract : Close structural analogues of 5-carboxamidotryptamine (5-CT) based on the newly discovered indole-imidazole scaffold were synthesized and evaluated to search for a 5-HT7 receptor agonist of higher selectivity. In vitro drug-likeness studies and in vivo pharmacological evaluation of potent and selective low-basicity 5-HT7 receptor agonists, previously published 7 (3-(1-ethyl-1H-imidazol-5-yl)-1H-indole-5-carboxamide, AH-494) and 13 (3-(1-methyl-1H-imidazol-5-yl)-1H-indole-5-carboxamide), have supported their usefulness as pharmacological tools. Comprehensive in vitro comparison studies between 7, 13 and the commonly used 5-CT showed their very similar ADMET properties. Compound 7 at 1 mg kg-1 reversed MK-801-induced disruption in novel object recognition in mice and alleviated stress-induced hyperthermia (SIH) at high doses. Taking into account both in vitro and in vivo data, 7 and 13 may be considered as alternatives to 5-CT as pharmacological tools with important additional benefit associated with their low-basicity: high selectivity over 5-HT1AR. DOI : 10.1039/C8MD00313K
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate after 10 mins in presence of NADPH
Liver
IC50 = 156.0 nM
Reference
Title : Identification of Dihydrofuro[3,4- d]pyrimidine Derivatives as Novel HIV-1 Non-Nucleoside Reverse Transcriptase Inhibitors with Promising Antiviral Activities and Desirable Physicochemical Properties. Authors : Kang D, Zhang H, Wang Z, Zhao T, Ginex T, Luque FJ, Yang Y, Wu G, Feng D, Wei F, Zhang J, De Clercq E, Pannecouque C, Chen CH, Lee KH, Murugan NA, Steitz TA, Zhan P, Liu X. Publication Year :
2019 Journal : J Med Chem Abstract : To address drug resistance to HIV-1 non-nucleoside reverse transcriptase inhibitors (NNRTIs), a series of novel diarylpyrimidine (DAPY) derivatives targeting "tolerant region I" and "tolerant region II" of the NNRTIs binding pocket (NNIBP) were designed utilizing a structure-guided scaffold-hopping strategy. The dihydrofuro[3,4- d]pyrimidine derivatives 13c2 and 13c4 proved to be exceptionally potent against a wide range of HIV-1 strains carrying single NNRTI-resistant mutations (EC<sub>50</sub> = 0.9-8.4 nM), which were remarkably superior to that of etravirine (ETV). Meanwhile, both compounds exhibited comparable activities with ETV toward the virus with double mutations F227L+V106A and K103N+Y181C. Furthermore, the most active compound 13c2 showed favorable pharmacokinetic properties with an oral bioavailability of 30.96% and a half-life of 11.1 h, which suggested that 13c2 is worth further investigation as a novel NNRTI to circumvent drug resistance. DOI : 10.1021/acs.jmedchem.8b01656
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate after 20 mins in presence of NADP by LC-MS/MS analysis
Liver
IC50 = 263.0 nM
Reference
Title : Exploiting the Tolerant Region I of the Non-Nucleoside Reverse Transcriptase Inhibitor (NNRTI) Binding Pocket: Discovery of Potent Diarylpyrimidine-Typed HIV-1 NNRTIs against Wild-Type and E138K Mutant Virus with Significantly Improved Water Solubility and Favorable Safety Profiles. Authors : Huang B, Chen W, Zhao T, Li Z, Jiang X, Ginex T, Vílchez D, Luque FJ, Kang D, Gao P, Zhang J, Tian Y, Daelemans D, De Clercq E, Pannecouque C, Zhan P, Liu X. Publication Year :
2019 Journal : J Med Chem Abstract : Diarylpyrimidine derivatives (DAPYs) exhibit robust anti-HIV-1 potency, although they have been compromised by E138K variant and severe side-effects and been suffering from poor water solubility. In the present work, hydrophilic morpholine or methylsulfonyl and sulfamide-substituted piperazine/piperidines were introduced into the right wing of DAPYs targeting the solvent-exposed tolerant region I. The anti-HIV-1 activities of 11c (EC50(WT) = 0.0035 μM, EC50(E138K) = 0.0075 μM) were the same as and 2-fold better than that of the lead etravirine against the wild-type and E138K mutant HIV-1, respectively, with a relative low cytotoxicity (CC50 ≥ 173 μM). Further test showed a significant improvement in the water solubility of 11c. Besides, 11c displayed no significant inhibition on main cytochrome P450 enzymes and exhibited no acute/subacute toxicities at doses of 2000 mg·kg-1/50 mg·kg-1 in mice. Taken together, we consider that 11c is a promising lead for further structural optimization. DOI : 10.1021/acs.jmedchem.8b01729
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan substrate in presence of NADPH incubated for 10 mins
Liver
IC50 = 134.0 nM
Reference
Title : Discovery and Characterization of Fluorine-Substituted Diarylpyrimidine Derivatives as Novel HIV-1 NNRTIs with Highly Improved Resistance Profiles and Low Activity for the hERG Ion Channel. Authors : Kang D, Ruiz FX, Feng D, Pilch A, Zhao T, Wei F, Wang Z, Sun Y, Fang Z, De Clercq E, Pannecouque C, Arnold E, Liu X, Zhan P. Publication Year :
2020 Journal : J Med Chem Abstract : Our previous efforts have led to the development of two potent NNRTIs, K-5a2 and 25a, exhibiting effective anti-HIV-1 potency and resistance profiles compared with etravirine. However, both inhibitors suffered from potent hERG inhibition and short half-life. In this article, with K-5a2 and etravirine as leads, series of novel fluorine-substituted diarylpyrimidine derivatives were designed via molecular hybridization and bioisosterism strategies. The results indicated 24b was the most active inhibitor, exhibiting broad-spectrum activity (EC50 = 3.60-21.5 nM) against resistant strains, significantly lower cytotoxicity (CC50= 155 μM), and reduced hERG inhibition (IC50 > 30 μM). Crystallographic studies confirmed the binding of 24b and the role of the fluorine atom, as well as optimal contacts of a nitrile group with the main-chain carbonyl group of H235. Furthermore, 24b showed longer half-life and favorable safety properties. All the results demonstrated that 24b has significant promise in circumventing drug resistance as an anti-HIV-1 candidate. DOI : 10.1021/acs.jmedchem.9b01769
QUINIDINE
Inhibition of human CYP2D6 in presence of NADPH by luciferase reporter gene assay
—
IC50 = 10.0 nM
Reference
Title : Design, Synthesis, and Biological Evaluation of New 1-(Aryl-1 H-pyrrolyl)(phenyl)methyl-1 H-imidazole Derivatives as Antiprotozoal Agents. Authors : Saccoliti F, Madia VN, Tudino V, De Leo A, Pescatori L, Messore A, De Vita D, Scipione L, Brun R, Kaiser M, Mäser P, Calvet CM, Jennings GK, Podust LM, Pepe G, Cirilli R, Faggi C, Di Marco A, Battista MR, Summa V, Costi R, Di Santo R. Publication Year :
2019 Journal : J Med Chem Abstract : We have designed and synthesized a series of new imidazole-based compounds structurally related to an antiprotozoal agent with nanomolar activity which we identified recently. The new analogues possess micromolar activities against Trypanosoma brucei rhodesiense and Leishmania donovani and nanomolar potency against Plasmodium falciparum. Most of the analogues displayed IC<sub>50</sub> within the low nanomolar range against Trypanosoma cruzi, with very high selectivity toward the parasite. Discussion of structure-activity relationships and in vitro biological data for the new compounds are provided against a number of different protozoa. The mechanism of action for the most potent derivatives (5i, 6a-c, and 8b) was assessed by a target-based assay using recombinant T. cruzi CYP51. Bioavailability and efficacy of selected hits were assessed in a T. cruzi mouse model, where 6a and 6b reduced parasitemia in animals >99% following intraperitoneal administration of 25 mg/kg/day dose for 4 consecutive days. DOI : 10.1021/acs.jmedchem.8b01464
QUINIDINE
Inhibition of human CYP2D6 by fluorescence method
—
IC50 = 10.0 nM
Reference
Title : Development of Robust 17(R),18(S)-Epoxyeicosatetraenoic Acid (17,18-EEQ) Analogues as Potential Clinical Antiarrhythmic Agents. Authors : Adebesin AM, Wesser T, Vijaykumar J, Konkel A, Paudyal MP, Lossie J, Zhu C, Westphal C, Puli N, Fischer R, Schunck WH, Falck JR. Publication Year :
2019 Journal : J Med Chem Abstract : 17(R),18(S)-Epoxyeicosatetraenoic acid (EEQ) is a cytochrome P450 metabolite of eicosapentaenoic acid (EPA) and a powerful negative chronotrope with low nanomolar activity in a neonatal rat cardiomyocyte (NRCM) arrhythmia model. Prior studies identified oxamide 2b as a soluble epoxide hydrolase (sEH) stable replacement but unsuitable for in vivo applications due to limited oral bioavailability and metabolic stability. These ADME limitations have been addressed in an improved generation of negative chronotropes, e.g., 4 and 16, which were evaluated as potential clinical candidates. DOI : 10.1021/acs.jmedchem.9b00952
QUINIDINE
Inhibition of human recombinant CYP2D6 using luciferin as substrate preincubated for 10 mins followed by substrate addition and measured after 50 mins in presence of NADPH by CYP450-Glo assay
—
IC50 = 6.9 nM
Reference
Title : Biphenyloxy-alkyl-piperidine and azepane derivatives as histamine H<sub>3</sub> receptor ligands. Authors : Łażewska D, Kaleta M, Schwed JS, Karcz T, Mogilski S, Latacz G, Olejarz A, Siwek A, Kubacka M, Lubelska A, Honkisz E, Handzlik J, Filipek B, Stark H, Kieć-Kononowicz K. Publication Year :
2017 Journal : Bioorg Med Chem Abstract : Novel biphenyloxy-alkyl derivatives of piperidine and azepane were synthesized and evaluated for their binding properties at the human histamine H<sub>3</sub> receptor. Two series of compounds were obtained with a meta- and a para-biphenyl moiety. The alkyl chain spacer contained five and six carbon atoms. The highest affinity among all compounds was shown by 1-(6-(3-phenylphenoxy)hexyl)azepane (13) with a K<sub>i</sub> value of 18nM. Two para-biphenyl derivatives, 1-(5-(4-phenylphenoxy)pentyl)piperidine (14; K<sub>i</sub>=25nM) and 1-(5-(4-phenylphenoxy)pentyl)azepane (16; K<sub>i</sub>=34nM), classified as antagonists in a cAMP accumulation assay (IC<sub>50</sub>=4 and 9nM, respectively), were studied in detail. Compounds 14 and 16 blocked RAMH-induced dipsogenia in rats (ED<sub>50</sub> of 2.72mg/kg and 1.75mg/kg respectively), and showed high selectivity (hH<sub>4</sub>R vs hH<sub>3</sub>R>600-fold) and low toxicity (hERG inhibition: IC<sub>50</sub>>1.70µM; hepatotoxicity IC<sub>50</sub>>12.5µM; non-mutagenic up to 10µM). Furthermore, the metabolic stability was evaluated in vitro on human liver microsomes (HLMs) and/or rat liver microsomes (RLMs). Metabolites produced were analyzed and tentatively identified by UPLC-MS techniques. The results demonstrated easy hydroxylation of the biphenyl ring. DOI : 10.1016/j.bmc.2017.07.058
QUINIDINE
Inhibition of CYP2D6 (unknown origin) expressed in insect cell microsomes using dibenzylfluorescein substrate by fluorescence based assay
—
IC50 = 7.3 nM
Reference
Title : Nitrogen-Walk Approach to Explore Bioisosteric Replacements in a Series of Potent A<sub>2B</sub> Adenosine Receptor Antagonists. Authors : Mallo-Abreu A, Prieto-Díaz R, Jespers W, Azuaje J, Majellaro M, Velando C, García-Mera X, Caamaño O, Brea J, Loza MI, Gutiérrez-de-Terán H, Sotelo E. Publication Year :
2020 Journal : J Med Chem Abstract : A systematic exploration of bioisosteric replacements for furan and thiophene cores in a series of potent A<sub>2B</sub>AR antagonists has been carried out using the nitrogen-walk approach. A collection of 42 novel alkyl 4-substituted-2-methyl-1,4-dihydrobenzo[4,5]imidazo[1,2-<i>a</i>]pyrimidine-3-carboxylates, which contain 18 different pentagonal heterocyclic frameworks at position 4, was synthesized and evaluated. This study enabled the identification of new ligands that combine remarkable affinity (<i>K<sub>i</sub></i> < 30 nM) and exquisite selectivity. The structure-activity relationship (SAR) trends identified were substantiated by a molecular modeling study, based on a receptor-driven docking model and including a systematic free energy perturbation (FEP) study. Preliminary evaluation of the CYP3A4 and CYP2D6 inhibitory activity in optimized ligands evidenced weak and negligible activity, respectively. The stereospecific interaction between <i>h</i>A<sub>2B</sub>AR and the eutomer of the most attractive novel antagonist (<i><b>S</b></i>)-<b>18g</b> (<i>K<sub>i</sub></i> = 3.66 nM) was validated. DOI : 10.1021/acs.jmedchem.0c00564
QUINIDINE
Inhibition of CYP2D6 in human liver microsome using probe substrate measured after 20 mins in presence of NADPH by LC-MS/MS analysis
Liver
IC50 = 134.0 nM
Reference
Title : Novel Human Urate Transporter 1 Inhibitors as Hypouricemic Drug Candidates with Favorable Druggability. Authors : Zhao T,Meng Q,Sun Z,Chen Y,Ai W,Zhao Z,Kang D,Dong Y,Liang R,Wu T,Pang J,Liu X,Zhan P Publication Year :
2020 Journal : J Med Chem Abstract : Lesinurad, a human urate transporter 1 (URAT1) inhibitor approved as a medication for the treatment of hyperuricemia associated with gout in 2015, can cause liver and renal toxicity. Here, we modified all three structural components of lesinurad by applying scaffold hopping, bioisosterism, and substituent-decorating strategies. In a mouse model of acute hyperuricemia, 21 of the synthesized compounds showed increased serum uric acid (SUA)-reducing activity; SUA was about 4-fold lower in animals treated with 44, 54, and 83 compared with lesinurad or benzbromarone. In the URAT1 inhibition assay, 44 was over 8-fold more potent than lesinurad (IC: 1.57 μM vs 13.21 μM). Notably, 83 also displayed potent inhibitory activity (IC = 31.73 μM) against GLUT9. Furthermore, we also preliminarily explored the effect of chirality on the potency of the promising derivatives 44 and 54. Compounds 44, 54, and 83 showed favorable drug-like pharmacokinetics and appear to be promising candidates for the treatment of hyperuricemia and gout. DOI : 10.1021/acs.jmedchem.0c00223
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes after 20 mins by LC-MS/MS analysis
Liver
IC50 = 44.0 nM
Reference
Title : Discovery of a Conformationally Constrained Oxazolidinone with Improved Safety and Efficacy Profiles for the Treatment of Multidrug-Resistant Tuberculosis. Authors : Zhao H,Wang B,Fu L,Li G,Lu H,Liu Y,Sheng L,Li Y,Zhang B,Lu Y,Ma C,Huang H,Zhang D,Lu Y Publication Year :
2020 Journal : J Med Chem Abstract : Tuberculosis (TB) remains a serious public health challenge, and the research and development of new anti-TB drugs is an essential component of the global strategy to eradicate TB. In this work, we discovered a conformationally constrained oxazolidinone 19c with improved anti-TB activity and safety profile through a focused lead optimization effort. Compound 19c displayed superior in vivo efficacy in a mouse TB infection model compared to linezolid and sutezolid. The druggability of compound 19c was demonstrated in a panel of assays including microsomal stability, cytotoxicity, cytochrome P450 enzyme inhibition, and pharmacokinetics in animals. Compound 19c demonstrated an excellent safety profile in a battery of safety assays, including mitochondrial protein synthesis, hERG K, hCav1.2, and Nav1.5 channels, monoamine oxidase, and genotoxicity. In a 4 week repeated dose toxicology study in rats, 19c appeared to have less bone marrow suppression than linezolid, which has been a major liability of the oxazolidinone class. DOI : 10.1021/acs.jmedchem.0c00500
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate incubated for 5 mins followed by NADPH addition and measured after 20 mins by LC-MS/MS analysis
Liver
IC50 = 35.6 nM
Reference
Title : Substituted benzothiophene and benzofuran derivatives as a novel class of bone morphogenetic Protein-2 upregulators: Synthesis, anti-osteoporosis efficacies in ovariectomized rats and a zebrafish model, and ADME properties. Authors : Xue ST,Zhang L,Xie ZS,Jin J,Guo HF,Yi H,Liu ZY,Li ZR Publication Year :
2020 Journal : Eur J Med Chem Abstract : The bone morphogenetic protein (BMP) pathway is a promising new target for the design of therapeutic agents for the treatment of low bone mass. This study optimized the structure of the anti-osteoporosis compound 38 by balancing its lipophilicity and improving its stability. Twenty derivatives which were not reported in the literature were designed and synthesized. The ovariectomized rat model of osteoporosis was selected to evaluate the therapeutic effects. Compound 125 showed better therapeutic efficacy than that of 38. We verified the anti-osteoporosis activity and BMP-2 protein upregulation after treatment with 125 in a zebrafish osteoporosis model. We found that 125 improved the ADME properties, therapeutic efficacy, and pharmacokinetics of the drug. Overall, we evaluated the anti-osteoporosis effects of the compounds of this type, preliminarily determined the target patient population, verified the mechanism of action, clarified the level of toxicity, and provided preliminary ADME data. We believe that these compounds can both correct bone loss that is already occurring in patients and have broad clinical applicability. DOI : 10.1016/j.ejmech.2020.112465
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using Dextromethorphan as substrate measured after 20 mins by LC-MS/MS analysis
Liver
IC50 = 40.8 nM
Reference
Title : Authors : Publication Year : Journal :
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate in presence of NADPH incubated for 10 mins by LC-MS/MS analysis
Liver
IC50 = 120.0 nM
Reference
Title : Authors : Publication Year : Journal :
QUINIDINE
Inhibition of CYP2D6 in human liver microsomes using bufuralol as substrate incubated for 10 mins in presence of NADPH by LC-MS/MS analysis
Liver
IC50 = 60.0 nM
Reference
Title : Authors : Publication Year : Journal :
QUINIDINE
Inhibition of CYP2D6 in human liver microsome using dextromethorphan as substrate
Liver
IC50 = 64.0 nM
Reference
Title : Authors : Publication Year : Journal :
QUINIDINE
Inhibition of CYP2D6 (unknown origin) using quinidine as substrate
—
IC50 = 18.0 nM
Reference
Title : Authors : Publication Year : Journal :
QUININE
Inhibition of MAMC O-dealkylation mediated by human Cytochrome P450 2D6 expressed in human lymphoblastoid cell line
—
IC50 = 610.0 nM
Reference
Title : Homology modeling of rat and human cytochrome P450 2D (CYP2D) isoforms and computational rationalization of experimental ligand-binding specificities. Authors : Venhorst J, ter Laak AM, Commandeur JN, Funae Y, Hiroi T, Vermeulen NP. Publication Year :
2003 Journal : J. Med. Chem. Abstract : The ligand-binding characteristics of rat and human CYP2D isoforms, i.e., rat CYP2D1-4 and human CYP2D6, were investigated by measuring IC(50) values of 11 known CYP2D6 ligands using 7-methoxy-4-(aminomethyl)coumarin (MAMC) as substrate. Like CYP2D6, all rat CYP2D isozymes catalyzed the O-demethylation of MAMC with K(m) and V(max) values ranging between 78 and 145 microM and 0.048 and 1.122 min(-1), respectively. To rationalize observed differences in the experimentally determined IC(50) values, homology models of the CYP2D isoforms were constructed. A homology model of CYP2D6 was generated on the basis of crystallized rabbit CYP2C5 and was validated on its ability to reproduce binding orientations corresponding to metabolic profiles of the substrates and to remain stable during unrestrained molecular dynamics simulations at 300 K. Twenty-two active site residues, sharing up to 59% sequence identity, were identified in the CYP2D binding pockets and included CYP2D6 residues Phe120, Glu216, and Asp301. Electrostatic potential calculations displayed large differences in the negative charge of the CYP2D active sites, which was consistent with observed differences in absolute IC(50) values. MD studies on the binding mode of sparteine, quinidine, and quinine in CYP2D2 and CYP2D6 furthermore concurred well with experimentally determined IC(50) values and metabolic profiles. The current study thus provides new insights into differences in the active site topology of the investigated CYP2D isoforms. DOI : 10.1021/jm0209578
QUININE
Inhibition of human CYP2D6 preincubated for 5 mins followed by NADPH addition and measured after 45 mins by luminescence based microplate reader analysis
—
IC50 = 10.0 nM
Reference
Title : Virtual screening-driven discovery of dual 5-HT<sub>6</sub>/5-HT<sub>2A</sub> receptor ligands with pro-cognitive properties. Authors : Staroń J, Kurczab R, Warszycki D, Satała G, Krawczyk M, Bugno R, Lenda T, Popik P, Hogendorf AS, Hogendorf A, Dubiel K, Matłoka M, Moszczyński-Pętkowski R, Pieczykolan J, Wieczorek M, Zajdel P, Bojarski AJ. Publication Year :
2020 Journal : Eur J Med Chem Abstract : A virtual screening campaign aimed at finding structurally new compounds active at 5-HT<sub>6</sub>R provided a set of candidates. Among those, one structure, 4-(5-{[(2-{5-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl}ethyl)amino]methyl}furan-2-yl)phenol (1, 5-HT<sub>6</sub>R K<sub>i</sub> = 91 nM), was selected as a hit for further optimization. As expected, the chemical scaffold of selected compound was significantly different from all the serotonin receptor ligands published to date. Synthetic efforts, supported by molecular modelling, provided 43 compounds representing different substitution patterns. The derivative 42, 4-(5-{[(2-{5-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl}ethyl)amino]methyl}furan-2-yl)phenol (5-HT<sub>6</sub>R K<sub>i</sub> = 25, 5-HT<sub>2A</sub>R K<sub>i</sub> = 32 nM), was selected as a lead and showed a good brain/plasma concentration profile, and it reversed phencyclidine-induced memory impairment. Considering the unique activity profile, the obtained series might be a good starting point for the development of a novel antipsychotic or antidepressant with pro-cognitive properties. DOI : 10.1016/j.ejmech.2019.111857
RIMONABANT
Inhibition of CYP2D6 in human liver microsomes after 30 mins
Liver
IC50 > 20.0 nM
Reference
Title : Discovery of 2-(4-((1H-1,2,4-triazol-1-yl)methyl)-5-(4-bromophenyl)-1-(2-chlorophenyl)-1H-pyrazol-3-yl)-5-tert-butyl-1,3,4-thiadiazole (GCC2680) as a potent, selective and orally efficacious cannabinoid-1 receptor antagonist. Authors : Lee J, Seo HJ, Lee SH, Kim J, Jung ME, Lee SH, Song KS, Lee J, Kang SY, Kim MJ, Kim MS, Son EJ, Lee M, Han HK. Publication Year :
2010 Journal : Bioorg. Med. Chem. Abstract : Structure-activity relationship studies in a series of diarylpyrazolyl thiadiazoles identified cannabinoid-1 receptor antagonists with excellent potency and selectivity. Based on its exceptional in vivo efficacy in animal models and its favorable pharmacokinetic and toxicological profiles, 2-(4-((1H-1,2,4-triazol-1-yl)methyl)-5-(4-bromophenyl)-1-(2-chlorophenyl)-1H-pyrazol-3-yl)-5-tert-butyl-1,3,4-thiadiazole (GCC2680) was selected as a preclinical candidate for the treatment of obesity. DOI : 10.1016/j.bmc.2010.07.013
ROSIGLITAZONE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TALAZOPARIB
Inhibition of CYP2D6 (unknown origin) at 10 uM
—
Inhibition < 12.0 %
Reference
Title : Discovery and Characterization of (8S,9R)-5-Fluoro-8-(4-fluorophenyl)-9-(1-methyl-1H-1,2,4-triazol-5-yl)-2,7,8,9-tetrahydro-3H-pyrido[4,3,2-de]phthalazin-3-one (BMN 673, Talazoparib), a Novel, Highly Potent, and Orally Efficacious Poly(ADP-ribose) Polymerase-1/2 Inhibitor, as an Anticancer Agent. Authors : Wang B, Chu D, Feng Y, Shen Y, Aoyagi-Scharber M, Post LE. Publication Year :
2016 Journal : J. Med. Chem. Abstract : We discovered and developed a novel series of tetrahydropyridophthlazinones as poly(ADP-ribose) polymerase (PARP) 1 and 2 inhibitors. Lead optimization led to the identification of (8S,9R)-47 (talazoparib; BMN 673; (8S,9R)-5-fluoro-8-(4-fluorophenyl)-9-(1-methyl-1H-1,2,4-triazol-5-yl)-2,7,8,9-tetrahydro-3H-pyrido[4,3,2-de]phthalazin-3-one). The novel stereospecific dual chiral-center-embedded structure of this compound has enabled extensive and unique binding interactions with PARP1/2 proteins. (8S,9R)-47 demonstrates excellent potency, inhibiting PARP1 and PARP2 enzyme activity with Ki = 1.2 and 0.87 nM, respectively. It inhibits PARP-mediated PARylation in a whole-cell assay with an EC50 of 2.51 nM and prevents proliferation of cancer cells carrying mutant BRCA1/2, with EC50 = 0.3 nM (MX-1) and 5 nM (Capan-1), respectively. (8S,9R)-47 is orally available, displaying favorable pharmacokinetic (PK) properties and remarkable antitumor efficacy in the BRCA1 mutant MX-1 breast cancer xenograft model following oral administration as a single-agent or in combination with chemotherapy agents such as temozolomide and cisplatin. (8S,9R)-47 has completed phase 1 clinical trial and is currently being studied in phase 2 and 3 clinical trials for the treatment of locally advanced and/or metastatic breast cancer with germline BRCA1/2 deleterious mutations. DOI : 10.1021/acs.jmedchem.5b01498
TAMOXIFEN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
TARANABANT
Inhibition of CYP2D6 in human liver microsomes after 30 mins
Liver
IC50 = 0.59 nM
Reference
Title : Discovery of 2-(4-((1H-1,2,4-triazol-1-yl)methyl)-5-(4-bromophenyl)-1-(2-chlorophenyl)-1H-pyrazol-3-yl)-5-tert-butyl-1,3,4-thiadiazole (GCC2680) as a potent, selective and orally efficacious cannabinoid-1 receptor antagonist. Authors : Lee J, Seo HJ, Lee SH, Kim J, Jung ME, Lee SH, Song KS, Lee J, Kang SY, Kim MJ, Kim MS, Son EJ, Lee M, Han HK. Publication Year :
2010 Journal : Bioorg. Med. Chem. Abstract : Structure-activity relationship studies in a series of diarylpyrazolyl thiadiazoles identified cannabinoid-1 receptor antagonists with excellent potency and selectivity. Based on its exceptional in vivo efficacy in animal models and its favorable pharmacokinetic and toxicological profiles, 2-(4-((1H-1,2,4-triazol-1-yl)methyl)-5-(4-bromophenyl)-1-(2-chlorophenyl)-1H-pyrazol-3-yl)-5-tert-butyl-1,3,4-thiadiazole (GCC2680) was selected as a preclinical candidate for the treatment of obesity. DOI : 10.1016/j.bmc.2010.07.013
TICLOPIDINE
Time dependent inhibition of CYP2D6 (unknown origin) at 10 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
VENLAFAXINE
Inhibition of human recombinant CYP2D6 at 5 uM assessed as blockade of O-demethylation of dextromethorphan in to dextrophan by nanoscale automated in-capillary assay
—
Inhibition = 0.0 %
Reference
Title : Development of an in-capillary approach to nanoscale automated in vitro cytochromes p450 assays. Authors : Nicoli R, Curcio R, Rudaz S, Veuthey JL. Publication Year :
2009 Journal : J. Med. Chem. Abstract : A method to perform nanoscale automated CYP450-based drug metabolism studies using a capillary as a reaction vessel is described. In-capillary assays consumed only approximately 30 nL of recombinant human CYP450 solution. Ultrafast analysis of substrates and metabolites was achieved off-line by ultrahigh-pressure liquid chromatography coupled to mass spectrometry. This approach was successfully applied to qualitative metabolism studies of six major CYP450 isozymes and CYP2D6 inhibition experiments. DOI : 10.1021/jm900201b
VERAPAMIL
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
WARFARIN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
YOHIMBINE
Inhibition of 1'-hydroxybufuralol formation by human liver microsomes
Liver
Ki = 230.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
YOHIMBINE
Inhibition of 1'-hydroxybufuralol formation by human liver microsomes
Liver
Ki = 140.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
YOHIMBINE
Inhibition of 1'-hydroxybufuralol formation by human liver microsomes
Liver
Ki = 180.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
YOHIMBINE
Inhibition of 1'-hydroxybufuralol formation by human liver microsomes
Liver
Ki = 190.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
YOHIMBINE
Inhibitory effect on Bufuralol 1'-hydroxylation by human liver microsomes (Ki = apparent inhibition constant)
Liver
Ki = 180.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
YOHIMBINE
Inhibition of partially purified cytochrome P450 2D6 1'-hydroxybufuralol formation
—
Ki = 520.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
IMIPRAMINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ABIRATERONE
Inhibition of human hepatic CYP2D6 at 1 uM relative to control
—
Inhibition = 10.4 %
Reference
Title : Discovery of novel 1,2,3,4-tetrahydrobenzo[4, 5]thieno[2, 3-c]pyridine derivatives as potent and selective CYP17 inhibitors. Authors : Wang M, Fang Y, Gu S, Chen F, Zhu Z, Sun X, Zhu J. Publication Year :
2017 Journal : Eur J Med Chem Abstract : The inhibition of CYP17 to block androgen biosynthesis is a well validated strategy for the treatment of prostate cancer. Herein we reported the design, synthesis and structure-activity relationship (SAR) study for a series of novel 1,2,3,4- tetrahydrobenzo[4,5]thieno[2,3-c]pyridine derivatives. Some analogs demonstrated a potent inhibition to both rat and human CYP17 protein and reduced testosterone production in human H295R cell line. Some analogs also showed high selectivity against other CYP enzymes such as 3A4, 1A2, 2C9, 2C19 and 2D6, which may limit side effects due to drug-drug interactions. Among these analogs, the most potent compound 9c showed 1.5 fold more potent against rat and human CYP17 protein than that of abiraterone (IC50 = 16 nM and 20 nM vs. 25 nM and 36 nM respectively). In NCI-H295R cells, the inhibitory effect of compound 9c on testosterone production (52± 2%) was also more potent than that of abiraterone (74± 15%) at the concentration of 1 μM. Further, it was shown that 9c reduced plasma testosterone level in a dose-dependent manner in Sprague-Dawley rats. Thus, analog 9c maybe a potential agent used for the treatment of prostate cancer. DOI : 10.1016/j.ejmech.2017.03.037
ABIRATERONE
Inhibition of human hepatic CYP2D6 at 10 uM relative to control
—
Inhibition = 78.5 %
Reference
Title : Discovery of novel 1,2,3,4-tetrahydrobenzo[4, 5]thieno[2, 3-c]pyridine derivatives as potent and selective CYP17 inhibitors. Authors : Wang M, Fang Y, Gu S, Chen F, Zhu Z, Sun X, Zhu J. Publication Year :
2017 Journal : Eur J Med Chem Abstract : The inhibition of CYP17 to block androgen biosynthesis is a well validated strategy for the treatment of prostate cancer. Herein we reported the design, synthesis and structure-activity relationship (SAR) study for a series of novel 1,2,3,4- tetrahydrobenzo[4,5]thieno[2,3-c]pyridine derivatives. Some analogs demonstrated a potent inhibition to both rat and human CYP17 protein and reduced testosterone production in human H295R cell line. Some analogs also showed high selectivity against other CYP enzymes such as 3A4, 1A2, 2C9, 2C19 and 2D6, which may limit side effects due to drug-drug interactions. Among these analogs, the most potent compound 9c showed 1.5 fold more potent against rat and human CYP17 protein than that of abiraterone (IC50 = 16 nM and 20 nM vs. 25 nM and 36 nM respectively). In NCI-H295R cells, the inhibitory effect of compound 9c on testosterone production (52± 2%) was also more potent than that of abiraterone (74± 15%) at the concentration of 1 μM. Further, it was shown that 9c reduced plasma testosterone level in a dose-dependent manner in Sprague-Dawley rats. Thus, analog 9c maybe a potential agent used for the treatment of prostate cancer. DOI : 10.1016/j.ejmech.2017.03.037
CHLOROQUINE
Inhibition of CYP2D6 in human liver microsomes assessed as metabolite produced at 1 uM by LC-MS/MS analysis relative to control
Liver
Inhibition = 99.0 %
Reference
Title : Development of a new generation of 4-aminoquinoline antimalarial compounds using predictive pharmacokinetic and toxicology models. Authors : Ray S, Madrid PB, Catz P, LeValley SE, Furniss MJ, Rausch LL, Guy RK, DeRisi JL, Iyer LV, Green CE, Mirsalis JC. Publication Year :
2010 Journal : J. Med. Chem. Abstract : Among the known antimalarial drugs, chloroquine (CQ) and other 4-aminoquinolines have shown high potency and good bioavailability. Yet complications associated with drug resistance necessitate the discovery of effective new antimalarial agents. ADMET prediction studies were employed to evaluate a library of new molecules based on the 4-aminoquinolone-related structure of CQ. Extensive in vitro screening and in vivo pharmacokinetic studies in mice helped to identify two lead molecules, 18 and 4, with promising in vitro therapeutic efficacy, improved ADMET properties, low risk for drug-drug interactions, and desirable pharmacokinetic profiles. Both 18 and 4 are highly potent antimalarial compounds, with IC(50) values of 5.6 and 17.3 nM, respectively, against the W2 (CQ-resistant) strain of Plasmodium falciparum (for CQ, IC(50) = 382 nM). When tested in mice, these compounds were found to have biological half-lives and plasma exposure values similar to or higher than those of CQ; they are therefore desirable candidates to pursue in future clinical trials. DOI : 10.1021/jm100057h
CHLOROQUINE
Inhibition of CYP2D6 in human liver microsomes assessed as metabolite produced at 10 uM by LC-MS/MS analysis relative to control
Liver
Inhibition = 90.0 %
Reference
Title : Development of a new generation of 4-aminoquinoline antimalarial compounds using predictive pharmacokinetic and toxicology models. Authors : Ray S, Madrid PB, Catz P, LeValley SE, Furniss MJ, Rausch LL, Guy RK, DeRisi JL, Iyer LV, Green CE, Mirsalis JC. Publication Year :
2010 Journal : J. Med. Chem. Abstract : Among the known antimalarial drugs, chloroquine (CQ) and other 4-aminoquinolines have shown high potency and good bioavailability. Yet complications associated with drug resistance necessitate the discovery of effective new antimalarial agents. ADMET prediction studies were employed to evaluate a library of new molecules based on the 4-aminoquinolone-related structure of CQ. Extensive in vitro screening and in vivo pharmacokinetic studies in mice helped to identify two lead molecules, 18 and 4, with promising in vitro therapeutic efficacy, improved ADMET properties, low risk for drug-drug interactions, and desirable pharmacokinetic profiles. Both 18 and 4 are highly potent antimalarial compounds, with IC(50) values of 5.6 and 17.3 nM, respectively, against the W2 (CQ-resistant) strain of Plasmodium falciparum (for CQ, IC(50) = 382 nM). When tested in mice, these compounds were found to have biological half-lives and plasma exposure values similar to or higher than those of CQ; they are therefore desirable candidates to pursue in future clinical trials. DOI : 10.1021/jm100057h
CLOPIDOGREL
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PIOGLITAZONE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ZOMEPIRAC
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DORAMAPIMOD
Inhibition of CYP2D6 (unknown origin) at 30 uM
—
Inhibition = 11.0 %
Reference
Title : Discovery of Narrow Spectrum Kinase Inhibitors: New Therapeutic Agents for the Treatment of COPD and Steroid-Resistant Asthma. Authors : Onions ST, Ito K, Charron CE, Brown RJ, Colucci M, Frickel F, Hardy G, Joly K, King-Underwood J, Kizawa Y, Knowles I, Murray PJ, Novak A, Rani A, Rapeport G, Smith A, Strong P, Taddei DM, Williams JG. Publication Year :
2016 Journal : J. Med. Chem. Abstract : The discovery of a novel series of therapeutic agents that has been designed and optimized for treating chronic obstructive pulmonary disease is reported. The pharmacological strategy was based on the identification of compounds that inhibit a defined subset of kinase enzymes modulating inflammatory processes that would be effective against steroid refractory disease and exhibit a sustained duration of action after inhaled delivery. DOI : 10.1021/acs.jmedchem.5b01029
AMINOPYRINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
PF-00562271
Inhibition of CYP2D6 (unknown origin) at 10 uM relative to control
—
Inhibition = 90.5 %
Reference
Title : Authors : Publication Year : Journal :
LUMINESPIB
Inhibition of CYP2D6 in human liver microsomes at 10 uM after 20 mins
Liver
Inhibition = 30.0 %
Reference
Title : Discovery of potent N-(isoxazol-5-yl)amides as HSP90 inhibitors. Authors : Chen D, Shen A, Li J, Shi F, Chen W, Ren J, Liu H, Xu Y, Wang X, Yang X, Sun Y, Yang M, He J, Wang Y, Zhang L, Huang M, Geng M, Xiong B, Shen J. Publication Year :
2014 Journal : Eur. J. Med. Chem. Abstract : HSP90 is ubiquitously overexpressed in a broad spectrum of human cancers and has been recognized as an attractive target for cancer treatment. Here, we described the fragment screening, synthesis and structure-activity relationship studies of small molecule inhibitors with 4,5-diarylisoxazole scaffold targeting HSP90. Among them, the compound N-(3-(2,4-dihydroxy-5-isopropylphenyl)-4-(4-((4-morpholinopiperidin-1-yl)methyl)phenyl)isoxazol-5-yl)cyclopropanecarboxamide (108) showed high affinity for binding to HSP90 (FP binding assay, IC50 = 0.030 μM) and inhibited the proliferation of various human cancer cell lines with averaging GI50 about 88 nM. Compound 108 exhibited its functional inhibition of HSP90 by depleting key signaling pathways and concomitantly elevating of HSP70 and HSP27 in U-87MG cells. Further in vivo studies showed that compound 108 strongly suppressed the tumor growth of human glioblastoma xenograft model U-87MG with T/C = 18.35% at 50 mg/kg q3w/2.5w. Moreover, compound 108 also exhibited good pharmacokinetic properties. Together, our study implicates that compound 108 is a promising candidate of HSP90 inhibitor and is currently advanced to preclinical study. DOI : 10.1016/j.ejmech.2014.09.065
CHS-828
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate in presence of NADPH by LC-MS/MS analysis
Liver
IC50 = 190.0 nM
Reference
Title : Minimizing CYP2C9 Inhibition of Exposed-Pyridine NAMPT (Nicotinamide Phosphoribosyltransferase) Inhibitors. Authors : Zak M, Yuen PW, Liu X, Patel S, Sampath D, Oeh J, Liederer BM, Wang W, O'Brien T, Xiao Y, Skelton N, Hua R, Sodhi J, Wang Y, Zhang L, Zhao G, Zheng X, Ho YC, Bair KW, Dragovich PS. Publication Year :
2016 Journal : J Med Chem Abstract : NAMPT inhibitors may show potential as therapeutics for oncology. Throughout our NAMPT inhibitor program, we found that exposed pyridines or related heterocyclic systems in the left-hand portion of the inhibitors are necessary pharmacophores for potent cellular NAMPT inhibition. However, when combined with a benzyl group in the center of the inhibitors, such pyridine-like moieties also led to consistent and potent inhibition of CYP2C9. In an attempt to reduce CYP2C9 inhibition, a parallel synthesis approach was used to identify central benzyl group replacements with increased Fsp3. A spirocyclic central motif was thus discovered that was combined with left-hand pyridines (or pyridine-like systems) to provide cellularly potent NAMPT inhibitors with minimal CYP2C9 inhibition. Further optimization of potency and ADME properties led to the discovery of compound 68, a highly potent NAMPT inhibitor with outstanding efficacy in a mouse tumor xenograft model and lacking measurable CYP2C9 inhibition at the concentrations tested. DOI : 10.1021/acs.jmedchem.6b00697
ADL-5747
Inhibition of human CYP2D6 at 10 uM
—
Inhibition = 12.5 %
Reference
Title : Spirocyclic delta opioid receptor agonists for the treatment of pain: discovery of N,N-diethyl-3-hydroxy-4-(spiro[chromene-2,4'-piperidine]-4-yl) benzamide (ADL5747). Authors : Le Bourdonnec B, Windh RT, Leister LK, Zhou QJ, Ajello CW, Gu M, Chu GH, Tuthill PA, Barker WM, Koblish M, Wiant DD, Graczyk TM, Belanger S, Cassel JA, Feschenko MS, Brogdon BL, Smith SA, Derelanko MJ, Kutz S, Little PJ, DeHaven RN, DeHaven-Hudkins DL, Dolle RE. Publication Year :
2009 Journal : J. Med. Chem. Abstract : Selective, nonpeptidic delta opioid receptor agonists have been the subject of great interest as potential novel analgesic agents. The discoveries of BW373U86 (1) and SNC80 (2) contributed to the rapid expansion of research in this field. However, poor drug-like properties and low therapeutic indices have prevented clinical evaluation of these agents. Doses of 1 and 2 similar to those required for analgesic activity produce convulsions in rodents and nonhuman primates. Recently, we described a novel series of potent, selective, and orally bioavailable delta opioid receptor agonists. The lead derivative, ADL5859 (4), is currently in phase II proof-of-concept studies for the management of pain. Further structure activity relationship exploration has led to the discovery of ADL5747 (36), which is approximately 50-fold more potent than 4 in an animal model of inflammatory pain. On the basis of its favorable efficacy, safety, and pharmacokinetic profile, 36 was selected as a clinical candidate for the treatment of pain. DOI : 10.1021/jm900773n
TRIFLUPERIDOL
Inhibitory constant for cytochrome P450 2D6
—
Ki = 170.0 nM
Reference
Title : Development of a pharmacophore for inhibition of human liver cytochrome P-450 2D6: molecular modeling and inhibition studies. Authors : Strobl GR, von Kruedener S, Stöckigt J, Guengerich FP, Wolff T. Publication Year :
1993 Journal : J. Med. Chem. Abstract : To gain insight into the specificity of cytochrome P-450 2D6 toward inhibitors, a preliminary pharmacophore model was built up using strong competitive inhibitors. Ajmalicine (1), the strongest inhibitor known (Ki = 3 nM) was selected as template because of its rigid structure. The preliminary pharmacophore model was validated by performing inhibition studies with derivatives of ajmalicine (1) and quinidine (9). Bufuralol (18) was chosen as substrate and the metabolite 1'-hydroxybufuralol (19) was separated by high performance liquid chromatography. All incubations were carried out using human liver microsomes after demonstration that the Ki values obtained with microsomes were in accordance with those obtained with a reconstituted monooxygenase system containing purified cytochrome P-450 2D6. Large differences of Ki values ranging between 0.005 and 100 microM were observed. Low-energy conformers of tested compounds were fit within the preliminary pharmacophore model. The analysis of steric and electronic properties of these compounds led to the definition of a final pharmacophore model. Characteristic properties are a positive charge on a nitrogen atom and a flat hydrophobic region, the plane of which is almost perpendicular to the N-H axis and maximally extends up to a distance of 7.5 A from the nitrogen atom. Compounds with high inhibitory potency had additional functional groups with negative molecular electrostatic potential and hydrogen bond acceptor properties on the opposite side at respective distances of 4.8-5.5 A and 6.6-7.5 A from the nitrogen atom. The superposition of strong and weak inhibitors led to the definition of an excluded volume map. Compounds that required additional space were not inhibitors. This is apparently the first pharmacophore model for inhibitors of a cytochrome P-450 enzyme and offers the opportunity to classify compounds according to their potency of inhibition. Adverse drug interactions which occur when both substrates and inhibitors of cytochrome P-450 2D6 are applied may be predicted. DOI : 10.1021/jm00061a004
EZLOPITANT
Inhibition of human CYP2D6 at 5 uM
—
Inhibition = 64.1 %
Reference
Title : Discovery and stereoselective synthesis of the novel isochroman neurokinin-1 receptor antagonist 'CJ-17,493'. Authors : Shishido Y, Wakabayashi H, Koike H, Ueno N, Nukui S, Yamagishi T, Murata Y, Naganeo F, Mizutani M, Shimada K, Fujiwara Y, Sakakibara A, Suga O, Kusano R, Ueda S, Kanai Y, Tsuchiya M, Satake K. Publication Year :
2008 Journal : Bioorg. Med. Chem. Abstract : A novel central nervous system (CNS) selective neurokinin-1 (NK(1)) receptor antagonist, (2S,3S)-3-[(1R)-6-methoxy-1-methyl-1-trifluoromethylisochroman-7-yl]-methylamino-2-phenylpiperidine 'CJ-17,493' (compound (+)-1), was synthesized stereoselectively using a kinetic resolution by lipase-PS as a key step. Compound (+)-1 displayed high and selective affinity (K(i)=0.2 nM) for the human NK(1) receptor in IM-9 cells, potent activity in the [Sar(9), Met(O(2))(11)]SP-induced gerbil tapping model (ED(50)=0.04 mg/kg, s.c.) and in the ferret cisplatin (10mg/kg, i.p.)-induced anti-emetic activity model (vomiting: ED(90)=0.07 mg/kg, s.c.), all levels of activity comparable with those of CP-122,721. In addition, compound (+)-1 exhibited linear pharmacokinetics rather than the super dose-proportionality of CP-122,721 and this result provides a potential solution for the clinical issue observed with CP-122,721. DOI : 10.1016/j.bmc.2008.06.047
EZLOPITANT
Binding affinity to human CYP2D6 using bufuralol as substrate
—
Ki = 420.0 nM
Reference
Title : Discovery and stereoselective synthesis of the novel isochroman neurokinin-1 receptor antagonist 'CJ-17,493'. Authors : Shishido Y, Wakabayashi H, Koike H, Ueno N, Nukui S, Yamagishi T, Murata Y, Naganeo F, Mizutani M, Shimada K, Fujiwara Y, Sakakibara A, Suga O, Kusano R, Ueda S, Kanai Y, Tsuchiya M, Satake K. Publication Year :
2008 Journal : Bioorg. Med. Chem. Abstract : A novel central nervous system (CNS) selective neurokinin-1 (NK(1)) receptor antagonist, (2S,3S)-3-[(1R)-6-methoxy-1-methyl-1-trifluoromethylisochroman-7-yl]-methylamino-2-phenylpiperidine 'CJ-17,493' (compound (+)-1), was synthesized stereoselectively using a kinetic resolution by lipase-PS as a key step. Compound (+)-1 displayed high and selective affinity (K(i)=0.2 nM) for the human NK(1) receptor in IM-9 cells, potent activity in the [Sar(9), Met(O(2))(11)]SP-induced gerbil tapping model (ED(50)=0.04 mg/kg, s.c.) and in the ferret cisplatin (10mg/kg, i.p.)-induced anti-emetic activity model (vomiting: ED(90)=0.07 mg/kg, s.c.), all levels of activity comparable with those of CP-122,721. In addition, compound (+)-1 exhibited linear pharmacokinetics rather than the super dose-proportionality of CP-122,721 and this result provides a potential solution for the clinical issue observed with CP-122,721. DOI : 10.1016/j.bmc.2008.06.047
ASTEMIZOLE
Inhibition of CYP2D6-mediated dextromethorphan metabolite formation in human liver microsomes at 0.3 uM after 8 mins by LC-MS/MS analysis relative to control
Liver
Inhibition = 8.5 %
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
ZOTIRACICLIB
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate after 30 mins by LC-MS/MS analysis
Liver
IC50 = 950.0 nM
Reference
Title : Discovery of kinase spectrum selective macrocycle (16E)-14-methyl-20-oxa-5,7,14,26-tetraazatetracyclo[19.3.1.1(2,6).1(8,12)]heptacosa-1(25),2(26),3,5,8(27),9,11,16,21,23-decaene (SB1317/TG02), a potent inhibitor of cyclin dependent kinases (CDKs), Janus kinase 2 (JAK2), and fms-like tyrosine kinase-3 (FLT3) for the treatment of cancer. Authors : William AD, Lee AC, Goh KC, Blanchard S, Poulsen A, Teo EL, Nagaraj H, Lee CP, Wang H, Williams M, Sun ET, Hu C, Jayaraman R, Pasha MK, Ethirajulu K, Wood JM, Dymock BW. Publication Year :
2012 Journal : J. Med. Chem. Abstract : Herein, we describe the design, synthesis, and SAR of a series of unique small molecule macrocycles that show spectrum selective kinase inhibition of CDKs, JAK2, and FLT3. The most promising leads were assessed in vitro for their inhibition of cancer cell proliferation, solubility, CYP450 inhibition, and microsomal stability. This screening cascade revealed 26 h as a preferred compound with target IC(50) of 13, 73, and 56 nM for CDK2, JAK2 and FLT3, respectively. Pharmacokinetic (PK) studies of 26 h in preclinical species showed good oral exposures. Oral efficacy was observed in colon (HCT-116) and lymphoma (Ramos) xenograft studies, in line with the observed PK/PD correlation. 26h (SB1317/TG02) was progressed into development in 2010 and is currently undergoing phase 1 clinical trials in advanced leukemias and multiple myeloma. DOI : 10.1021/jm201112g
TACRINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition = 24.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
BERGAPTEN
Inhibition of recombinant human CYP2D6 expressed in baker's yeast-derived microsomes (Sacchrosomes) at 10 uM using 7-ethoxy-methyloxy-3-cyanocoumarin substrate by EROD assay relative to control
—
Inhibition = 9.0 %
Reference
Title : Identification of karanjin isolated from the Indian beech tree as a potent CYP1 enzyme inhibitor with cellular efficacy <i>via</i> screening of a natural product repository. Authors : Joshi P, Sonawane VR, Williams IS, McCann GJP, Gatchie L, Sharma R, Satti N, Chaudhuri B, Bharate SB. Publication Year :
2018 Journal : MedChemComm Abstract : CYP1A1 is thought to mediate carcinogenesis in oral, lung and epithelial cancers. In order to identify a CYP1A1 inhibitor from an edible plant, 394 natural products in the IIIM's natural product repository were screened, at 10 μM concentration, using CYP1A1-Sacchrosomes™ (<i>i.e.</i> microsomal enzyme isolated from recombinant baker's yeast). Twenty-seven natural products were identified that inhibited 40-97% of CYP1A1's 7-ethoxyresorufin-<i>O</i>-deethylase activity. The IC<sub>50</sub> values of the 'hits', belonging to different chemical scaffolds, were determined. Their selectivity was studied against a panel of 8 CYP-Sacchrosomes™. In order to assess cellular efficacy, the 'hits' were screened for their capability to inhibit CYP enzymes expressed within live recombinant human embryonic kidney (HEK293) cells from plasmids encoding specific CYP genes (1A2, 1B1, 2C9, 2C19, 2D6, 3A4). Isopimpinellin (IN-475; IC<sub>50</sub>, 20 nM) and karanjin (IN-195; IC<sub>50</sub>, 30 nM) showed the most potent inhibition of CYP1A1 in human cells. Isopimpinellin is found in celery, parsnip, fruits and in the rind and pulp of limes whereas different parts of the Indian beech tree, which contain karanjin, have been used in traditional medicine. Both isopimpinellin and karanjin negate the cellular toxicity of CYP1A1-mediated benzo[<i>a</i>]pyrene. Molecular docking and molecular dynamic simulations with CYP isoforms rationalize the observed trends in the potency and selectivity of isopimpinellin and karanjin. DOI : 10.1039/C7MD00388A
TICRYNAFEN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
MAVELERTINIB
Inhibition of human CYP2D6 at 10 uM
—
Inhibition < 30.0 %
Reference
Title : Discovery of N-((3R,4R)-4-Fluoro-1-(6-((3-methoxy-1-methyl-1H-pyrazol-4-yl)amino)-9-methyl-9H-purin-2-yl)pyrrolidine-3-yl)acrylamide (PF-06747775) through Structure-Based Drug Design: A High Affinity Irreversible Inhibitor Targeting Oncogenic EGFR Mutants with Selectivity over Wild-Type EGFR. Authors : Planken S, Behenna DC, Nair SK, Johnson TO, Nagata A, Almaden C, Bailey S, Ballard TE, Bernier L, Cheng H, Cho-Schultz S, Dalvie D, Deal JG, Dinh DM, Edwards MP, Ferre RA, Gajiwala KS, Hemkens M, Kania RS, Kath JC, Matthews J, Murray BW, Niessen S, Orr ST, Pairish M, Sach NW, Shen H, Shi M, Solowiej J, Tran K, Tseng E, Vicini P, Wang Y, Weinrich SL, Zhou R, Zientek M, Liu L, Luo Y, Xin S, Zhang C, Lafontaine J. Publication Year :
2017 Journal : J Med Chem Abstract : Mutant epidermal growth factor receptor (EGFR) is a major driver of non-small-cell lung cancer (NSCLC). Marketed first generation inhibitors, such as erlotinib, effect a transient beneficial response in EGFR mutant NSCLC patients before resistance mechanisms render these inhibitors ineffective. Secondary oncogenic EGFR mutations account for approximately 50% of relapses, the most common being the gatekeeper T790M substitution that renders existing therapies ineffective. The discovery of PF-06459988 (1), an irreversible pyrrolopyrimidine inhibitor of EGFR T790M mutants, was recently disclosed.1 Herein, we describe our continued efforts to achieve potency across EGFR oncogenic mutations and improved kinome selectivity, resulting in the discovery of clinical candidate PF-06747775 (21), which provides potent EGFR activity against the four common mutants (exon 19 deletion (Del), L858R, and double mutants T790M/L858R and T790M/Del), selectivity over wild-type EGFR, and desirable ADME properties. Compound 21 is currently being evaluated in phase-I clinical trials of mutant EGFR driven NSCLC. DOI : 10.1021/acs.jmedchem.6b01894
LY-2886721
Inhibition of CYP2D6 in human liver microsomes at 10 uM using bufuralol as substrate preincubated for 10 mins followed by substrate and NADPH addition measured after 3 mins by LC-MS/MS analysis
Liver
Inhibition = 29.0 %
Reference
Title : Authors : Publication Year : Journal :
CP-866087
Inhibition of CYP2D6 (unknown origin) at 3 uM after 8 mins
—
Inhibition = 6.0 %
Reference
Title : Discovery of CP-866,087, a mu opioid receptor antagonist for the treatment of alcohol abuse and dependence Authors : McHardy SF, Heck SD, Guediche S, Kalman M, Allen MP, Tu M, Bryce DK, Schmidt AW, Vanase-Frawley M, Callegari E, Doran S, Grahame NJ, McLean S, Liras S Publication Year :
2011 Journal : MedChemComm DOI : 10.1039/C1MD00164G
AZD-3759
Inhibition of CYP2D6 (unknown origin)
—
IC50 > 50.0 nM
Reference
Title : Discovery and Evaluation of Clinical Candidate AZD3759, a Potent, Oral Active, Central Nervous System-Penetrant, Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitor. Authors : Zeng Q, Wang J, Cheng Z, Chen K, Johnström P, Varnäs K, Li DY, Yang ZF, Zhang X. Publication Year :
2015 Journal : J. Med. Chem. Abstract : Recent reports suggest that an increasing number of patients with lung cancer, especially those with activating mutations of the epidermal growth factor receptor (EGFR), also present with brain metastases and leptomeningeal metastases. These patients have poor prognosis as there are no approved drugs for these indications. Available agents have poor efficacy for these patients even at well above their standard dose. Herein, we report the discovery of (4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl (2R)-2,4-dimethylpiperazine-1-carboxylate 1m (AZD3759), an investigational drug currently in Phase 1 clinical trial, which has excellent central nervous system penetration and which induces profound regression of brain metastases in a mouse model. DOI : 10.1021/acs.jmedchem.5b01073
BUCINDOLOL
Inhibitory activity against recombinant human Cytochrome P450 2D6 (CYP2D6) after incubated for 45 minutes
—
IC50 = 50.0 nM
Reference
Title : A 3D-QSAR model for CYP2D6 inhibition in the aryloxypropanolamine series. Authors : Vaz RJ, Nayeem A, Santone K, Chandrasena G, Gavai AV. Publication Year :
2005 Journal : Bioorg. Med. Chem. Lett. Abstract : A comparative molecular similarity index analysis (CoMSiA) has been performed for cytochrome P450 2D6 inhibition on a series of aryloxypropanolamines to determine the factors contributing to this activity. The model is in agreement with a CYP2D6 homology model constructed on the basis of the mammalian CYP2C5 crystal structure. The energy minimized conformations were generated using the systematic search methodology in Sybyl 6.7. The model not only elucidated the relationship between structure and biological activity but, more importantly, provided useful strategies to modulate CYP2D6 affinity in the aryloxypropanolamine series. DOI : 10.1016/j.bmcl.2005.06.007
VEROSUDIL
Inhibition of human CYP2D6 at 10 uM
—
Inhibition = 67.0 %
Reference
Title : Discovery of the ROCK inhibitor netarsudil for the treatment of open-angle glaucoma. Authors : Sturdivant JM, Royalty SM, Lin CW, Moore LA, Yingling JD, Laethem CL, Sherman B, Heintzelman GR, Kopczynski CC, deLong MA. Publication Year :
2016 Journal : Bioorg. Med. Chem. Lett. Abstract : Inhibition of Rho kinase (ROCK) to improve fluid outflow through the trabecular meshwork and lower intraocular pressure is a strategy for the development of new anti-glaucoma agents. Alpha-aryl-beta-amino isoquinoline analogs were identified as potent ROCK inhibitors. Compounds that provided a longer duration of intraocular pressure reduction in Dutch Belted rabbits also inhibited norepinephrine transporter. Ester 60 improved bioavailability of its parent ROCK inhibitor, 29 (Ki=0.2nM) and demonstrated an effective and sustained IOP reduction for 24h after dosing. From these studies, netarsudil (a.k.a. AR-13324) was discovered and is currently in clinical trials for the treatment of glaucoma and ocular hypertension. DOI : 10.1016/j.bmcl.2016.03.104
VACTOSERTIB
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate at 10 uM incubated for 5 mins prior to substrate addition measured after 10 mins by LC/MS/MS analysis
Liver
Inhibition = 14.6 %
Reference
Title : Discovery of N-((4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-5-(6-methylpyridin-2-yl)-1H-imidazol-2-yl)methyl)-2-fluoroaniline (EW-7197): a highly potent, selective, and orally bioavailable inhibitor of TGF-β type I receptor kinase as cancer immunotherapeutic/antifibrotic agent. Authors : Jin CH, Krishnaiah M, Sreenu D, Subrahmanyam VB, Rao KS, Lee HJ, Park SJ, Park HJ, Lee K, Sheen YY, Kim DK. Publication Year :
2014 Journal : J. Med. Chem. Abstract : A series of 2-substituted-4-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-5-(6-methylpyridin-2-yl)imidazoles was synthesized and evaluated to optimize a prototype inhibitor of TGF-β type I receptor kinase (ALK5), 6. Combination of replacement of a quinoxalin-6-yl moiety of 6 with a [1,2,4]triazolo[1,5-a]pyridin-6-yl moiety, insertion of a methyleneamino linker, and a o-F substituent in the phenyl ring markedly increased ALK5 inhibitory activity, kinase selectivity, and oral bioavailability. The 12b (EW-7197) inhibited ALK5 with IC50 value of 0.013 μM in a kinase assay and with IC50 values of 0.0165 and 0.0121 μM in HaCaT (3TP-luc) stable cells and 4T1 (3TP-luc) stable cells, respectively, in a luciferase assay. Selectivity profiling of 12b using a panel of 320 protein kinases revealed that it is a highly selective ALK5/ALK4 inhibitor. Pharmacokinetic study with 12b·HCl in rats showed an oral bioavailability of 51% with high systemic exposure (AUC) of 1426 ng × h/mL and maximum plasma concentration (Cmax) of 1620 ng/mL. Rational optimization of 6 has led to the identification of a highly potent, selective, and orally bioavailable ALK5 inhibitor 12b. DOI : 10.1021/jm500115w
INDOMETHACIN
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
DEXTROMETHORPHAN
Inhibition of human CYP2D6 at 10 uM
—
Inhibition = 94.37 %
Reference
Title : Novel Pyrrolopyridone Bromodomain and Extra-Terminal Motif (BET) Inhibitors Effective in Endocrine-Resistant ER+ Breast Cancer with Acquired Resistance to Fulvestrant and Palbociclib. Authors : Li Y, Zhao J, Gutgesell LM, Shen Z, Ratia K, Dye K, Dubrovskyi O, Zhao H, Huang F, Tonetti DA, Thatcher GRJ, Xiong R. Publication Year :
2020 Journal : J Med Chem Abstract : Acquired resistance to fulvestrant and palbociclib is a new challenge to treatment of estrogen receptor positive (ER+) breast cancer. ER is expressed in most resistance settings; thus, bromodomain and extra-terminal protein inhibitors (BETi) that target BET-amplified ER-mediated transcription have therapeutic potential. Novel pyrrolopyridone BETi leveraged novel interactions with L92/L94 confirmed by a cocrystal structure of 27 with BRD4. Optimization of BETi using growth inhibition in fulvestrant-resistant (MCF-7:CFR) cells was confirmed in endocrine-resistant, palbociclib-resistant, and ESR1 mutant cell lines. 27 was more potent in MCF-7:CFR cells than six BET inhibitors in clinical trials. Transcriptomic analysis differentiated 27 from the benchmark BETi, JQ-1, showing downregulation of oncogenes and upregulation of tumor suppressors and apoptosis. The therapeutic approach was validated by oral administration of 27 in orthotopic xenografts of endocrine-resistant breast cancer in monotherapy and in combination with fulvestrant. Importantly, at an equivalent dose in rats, thrombocytopenia was mitigated. DOI : 10.1021/acs.jmedchem.0c00456
PLUMBAGIN
Inhibition of recombinant human CYP2D6 expressed in baker's yeast-derived microsomes (Sacchrosomes) at 10 uM using 7-ethoxy-methyloxy-3-cyanocoumarin substrate by EROD assay relative to control
—
Inhibition = 10.0 %
Reference
Title : Identification of karanjin isolated from the Indian beech tree as a potent CYP1 enzyme inhibitor with cellular efficacy <i>via</i> screening of a natural product repository. Authors : Joshi P, Sonawane VR, Williams IS, McCann GJP, Gatchie L, Sharma R, Satti N, Chaudhuri B, Bharate SB. Publication Year :
2018 Journal : MedChemComm Abstract : CYP1A1 is thought to mediate carcinogenesis in oral, lung and epithelial cancers. In order to identify a CYP1A1 inhibitor from an edible plant, 394 natural products in the IIIM's natural product repository were screened, at 10 μM concentration, using CYP1A1-Sacchrosomes™ (<i>i.e.</i> microsomal enzyme isolated from recombinant baker's yeast). Twenty-seven natural products were identified that inhibited 40-97% of CYP1A1's 7-ethoxyresorufin-<i>O</i>-deethylase activity. The IC<sub>50</sub> values of the 'hits', belonging to different chemical scaffolds, were determined. Their selectivity was studied against a panel of 8 CYP-Sacchrosomes™. In order to assess cellular efficacy, the 'hits' were screened for their capability to inhibit CYP enzymes expressed within live recombinant human embryonic kidney (HEK293) cells from plasmids encoding specific CYP genes (1A2, 1B1, 2C9, 2C19, 2D6, 3A4). Isopimpinellin (IN-475; IC<sub>50</sub>, 20 nM) and karanjin (IN-195; IC<sub>50</sub>, 30 nM) showed the most potent inhibition of CYP1A1 in human cells. Isopimpinellin is found in celery, parsnip, fruits and in the rind and pulp of limes whereas different parts of the Indian beech tree, which contain karanjin, have been used in traditional medicine. Both isopimpinellin and karanjin negate the cellular toxicity of CYP1A1-mediated benzo[<i>a</i>]pyrene. Molecular docking and molecular dynamic simulations with CYP isoforms rationalize the observed trends in the potency and selectivity of isopimpinellin and karanjin. DOI : 10.1039/C7MD00388A
MAVORIXAFOR
Inhibition of human CYP2D6 at 1 uM
—
Inhibition = 100.0 %
Reference
Title : Discovery of novel N-aryl piperazine CXCR4 antagonists. Authors : Zhao H, Prosser AR, Liotta DC, Wilson LJ. Publication Year :
2015 Journal : Bioorg. Med. Chem. Lett. Abstract : A novel series of CXCR4 antagonists with substituted piperazines as benzimidazole replacements is described. These compounds showed micromolar to nanomolar potency in CXCR4-mediated functional and HIV assays, namely inhibition of X4 HIV-1(IIIB) virus in MAGI-CCR5/CXCR4 cells and inhibition of SDF-1 induced calcium release in Chem-1 cells. Preliminary SAR investigations led to the identification of a series of N-aryl piperazines as the most potent compounds. Results show SAR that indicates type and position of the aromatic ring, as well as type of linker and stereochemistry are significant for activity. Profiling of several lead compounds showed that one (49b) reduced susceptibility towards CYP450 and hERG, and the best overall profile when considering both SDF-1 and HIV potencies (6-20 nM). DOI : 10.1016/j.bmcl.2015.04.036
LORATADINE
Inhibition of CYP2D6 in human liver microsomes using dextromethorphan as substrate after 8 mins by LC-MS/MS analysis
Liver
IC50 < 100.0 nM
Reference
Title : Identifying a selective substrate and inhibitor pair for the evaluation of CYP2J2 activity. Authors : Lee CA, Jones JP, Katayama J, Kaspera R, Jiang Y, Freiwald S, Smith E, Walker GS, Totah RA. Publication Year :
2012 Journal : Drug Metab. Dispos. Abstract : CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. To fully assess the role of CYP2J2 in drug metabolism, a selective substrate and potent specific chemical inhibitor are essential. In this study, we report amiodarone 4-hydoxylation as a specific CYP2J2-catalyzed reaction with no CYP3A4, or other drug-metabolizing enzyme, involvement. Amiodarone 4-hydroxylation enabled the determination of liver relative activity factor and intersystem extrapolation factor for CYP2J2. Amiodarone 4-hydroxylation correlated with astemizole O-demethylation but not with CYP2J2 protein content in a sample of human liver microsomes. To identify a specific CYP2J2 inhibitor, 138 drugs were screened using terfenadine and astemizole as probe substrates with recombinant CYP2J2. Forty-two drugs inhibited CYP2J2 activity by ≥50% at 30 μM, but inhibition was substrate-dependent. Of these, danazol was a potent inhibitor of both hydroxylation of terfenadine (IC(50) = 77 nM) and O-demethylation of astemizole (K(i) = 20 nM), and inhibition was mostly competitive. Danazol inhibited CYP2C9, CYP2C8, and CYP2D6 with IC(50) values of 1.44, 1.95, and 2.74 μM, respectively. Amiodarone or astemizole were included in a seven-probe cocktail for cytochrome P450 (P450) drug-interaction screening potential, and astemizole demonstrated a better profile because it did not appreciably interact with other P450 probes. Thus, danazol, amiodarone, and astemizole will facilitate the ability to determine the metabolic role of CYP2J2 in hepatic and extrahepatic tissues. DOI : 10.1124/dmd.111.043505
EXEMESTANE
Drug metabolism assessed as human recombinant CYP2D6-mediated 17-hydroexemestane and 6-Hydroxymethylexemestane formation assessed as inhibition of metabolite formation at 10 uM after 10 mins by Michaelis-Menten saturation curve analysis in presence of 1 uM quinidine
—
Inhibition < 20.0 %
Reference
Title : In vitro cytochrome P450-mediated metabolism of exemestane. Authors : Kamdem LK, Flockhart DA, Desta Z. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Exemestane is a potent and irreversible steroidal aromatase inhibitor drug used for the treatment of estrogen receptor-positive breast cancer. Our aim was to identify and assess the contribution of the specific cytochromes P450 (P450s) responsible for exemestane primary in vitro metabolism. With the use of high-performance liquid chromatography and liquid chromatography-tandem mass spectrometry analytical techniques, 17-hydroexemestane (MI) formation and 6-hydroxymethylexemestane (MII) formation were found to be the predominant exemestane metabolic pathways. In a bank of 15 well characterized human liver microsomes with known P450 isoform-specific activities, the MI formation rate correlated significantly with CYP1A2 (Spearman r = 0.60, p = 0.02) and CYP4A11 (Spearman r = 0.67, p = 0.01) isoform-specific activities, whereas the MII production rate significantly correlated with CYP2B6 (Spearman r = 0.57, p = 0.03) and CYP3A (Spearman r = 0.76, p = 0.005) isoform-specific activities. Recombinant CYP1A1 metabolized exemestane to MI with a catalytic efficiency (Cl(int)) of 150 nl/pmol P450 × min that was at least 3.5-fold higher than those of other P450s investigated. Recombinant CYP3A4 catalyzed MII formation from exemestane with a catalytic efficiency of 840 nl/pmol P450 × min that was at least 4-fold higher than those of other P450s investigated. Among a panel of 10 chemical inhibitors tested, only ketoconazole and troleandomycin (CYP3A-specific chemical inhibitors) significantly inhibited the formation of MII by 45 and 95%, respectively. None of them markedly inhibited the formation of MI. In summary, exemestane seems to be metabolized to MI by multiple P450s that include CYP4A11 and CYP1A1/2, whereas its oxidation to MII is primarily mediated by CYP3A. DOI : 10.1124/dmd.110.032276
NEVIRAPINE
Time dependent inhibition of CYP2D6 (unknown origin) at 100 uM by LC/MS system
—
Inhibition < 10.0 %
Reference
Title : Combination of GSH trapping and time-dependent inhibition assays as a predictive method of drugs generating highly reactive metabolites. Authors : Nakayama S, Takakusa H, Watanabe A, Miyaji Y, Suzuki W, Sugiyama D, Shiosakai K, Honda K, Okudaira N, Izumi T, Okazaki O. Publication Year :
2011 Journal : Drug Metab. Dispos. Abstract : Covalent binding (CB) of reactive metabolites (RMs) is potentially involved in severe adverse drug reactions. Because the CB assay is of low throughput and costly, a qualitative trapping assay using agents such as [(35)S]GSH is often performed in the early stages of drug discovery. However, trapping methods alone cannot replace the CB assay. We hypothesized that the time-dependent inhibition (TDI) assay might be complementary to the [(35)S]GSH trapping assay in detecting RMs. We performed CB assays, [(35)S]GSH trapping assays, and TDI assays for 42 structurally diverse compounds. First, we showed that the [(35)S]GSH trapping assay alone does not correlate with the extent of CB. Four compounds that the [(35)S]GSH trapping assay failed to detect but that showed high extent of CB were inactivators of the enzyme in the TDI assay. There was a tendency for compounds judged as positive in the TDI assay to show a high degree of CB irrespective of the result of the [(35)S]GSH trapping assay. Finally, to combine parameters from the two assays, we introduced intrinsic clearance to describe the formation of RMs (CL(int, RMs)). The Spearman rank correlation coefficient between the extent of CB and CL(int, RMs) was 0.77 (p < 0.0001), which was better than that for the formation rates of [(35)S]GSH adducts. Therefore, we demonstrated that a combination of the [(35)S]GSH trapping and TDI assays is an effective method for detecting compounds potentially capable of generating highly reactive metabolites in the early stages of drug discovery. DOI : 10.1124/dmd.111.039180
ALDUMASTAT
Inhibition of CYP2D6 (unknown origin) at 10 uM
—
Inhibition < 50.0 %
Reference
Title : Authors : Publication Year : Journal :
ZIMLOVISERTIB
Inhibition of CYP2D6 in human liver microsomes at 3 uM
Liver
Inhibition < 5.0 %
Reference
Title : Discovery of Clinical Candidate 1-{[(2S,3S,4S)-3-Ethyl-4-fluoro-5-oxopyrrolidin-2-yl]methoxy}-7-methoxyisoquinoline-6-carboxamide (PF-06650833), a Potent, Selective Inhibitor of Interleukin-1 Receptor Associated Kinase 4 (IRAK4), by Fragment-Based Drug Design. Authors : Lee KL, Ambler CM, Anderson DR, Boscoe BP, Bree AG, Brodfuehrer JI, Chang JS, Choi C, Chung S, Curran KJ, Day JE, Dehnhardt CM, Dower K, Drozda SE, Frisbie RK, Gavrin LK, Goldberg JA, Han S, Hegen M, Hepworth D, Hope HR, Kamtekar S, Kilty IC, Lee A, Lin LL, Lovering FE, Lowe MD, Mathias JP, Morgan HM, Murphy EA, Papaioannou N, Patny A, Pierce BS, Rao VR, Saiah E, Samardjiev IJ, Samas BM, Shen MWH, Shin JH, Soutter HH, Strohbach JW, Symanowicz PT, Thomason JR, Trzupek JD, Vargas R, Vincent F, Yan J, Zapf CW, Wright SW. Publication Year :
2017 Journal : J Med Chem Abstract : Through fragment-based drug design focused on engaging the active site of IRAK4 and leveraging three-dimensional topology in a ligand-efficient manner, a micromolar hit identified from a screen of a Pfizer fragment library was optimized to afford IRAK4 inhibitors with nanomolar potency in cellular assays. The medicinal chemistry effort featured the judicious placement of lipophilicity, informed by co-crystal structures with IRAK4 and optimization of ADME properties to deliver clinical candidate PF-06650833 (compound 40). This compound displays a 5-unit increase in lipophilic efficiency from the fragment hit, excellent kinase selectivity, and pharmacokinetic properties suitable for oral administration. DOI : 10.1021/acs.jmedchem.7b00231
EMAVUSERTIB
Inhibition of CYP2D6 (unknown origin) at 1 uM relative to control