|
Binding affinity using [125I]ABA against human Adenosine A1 receptor
|
Homo sapiens
|
99.0
nM
|
|
Journal : J. Med. Chem.
Title : 3'-Aminoadenosine-5'-uronamides: discovery of the first highly selective agonist at the human adenosine A3 receptor.
Year : 2003
Volume : 46
Issue : 3
First Page : 353
Last Page : 355
Authors : DeNinno MP, Masamune H, Chenard LK, DiRico KJ, Eller C, Etienne JB, Tickner JE, Kennedy SP, Knight DR, Kong J, Oleynek JJ, Tracey WR, Hill RJ.
Abstract : Selective adenosine A(3) agonists have potential utility for the prevention of perioperative myocardial ischemic injury. Herein, we report on the discovery and synthesis of compound 7. This amino nucleoside agonist possesses unprecedented levels of selectivity for the human adenosine A(3) receptor.
|
Binding affinity for rat Adenosine A1 receptor in CHO cells using [3H]N6-(R)-phenylisopropyladenosine
|
Rattus norvegicus
|
820.0
nM
|
|
Journal : J. Med. Chem.
Title : N6-substituted D-4'-thioadenosine-5'-methyluronamides: potent and selective agonists at the human A3 adenosine receptor.
Year : 2003
Volume : 46
Issue : 18
First Page : 3775
Last Page : 3777
Authors : Jeong LS, Jin DZ, Kim HO, Shin DH, Moon HR, Gunaga P, Chun MW, Kim YC, Melman N, Gao ZG, Jacobson KA.
Abstract : 4'-Thio analogues 3-5 of Cl-IB-MECA (2) (K(i) = 1.0 +/- 0.2 nM at the human A(3) adenosine receptor) were synthesized from d-gulono-gamma-lactone via 4-thioribosyl acetate 14 as the key intermediate. All synthesized 4'-thionucleosides exhibited higher binding affinity to the human A(3) adenosine receptor than Cl-IB-MECA, among which 4 showed the most potent binding affinity (K(i) = 0.28 +/- 0.09 nM). 4 was also selective for A(3) vs human A(1) and human A(2A) receptors by 4800- and 36000-fold, respectively.
|
Binding affinity for adenosine A1 receptor as inhibition of 3[H]-R-PIA binding in rat brain
|
Rattus norvegicus
|
54.0
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : The synthesis of new adenosine A3 selective ligands containing bioisosteric isoxazoles.
Year : 1998
Volume : 8
Issue : 13
First Page : 1767
Last Page : 1770
Authors : Mogensen JP, Roberts SM, Bowler AN, Thomsen C, Knutsen LJ.
Abstract : The synthesis and purinergic receptor binding of novel adenosine A3 ligands is described. Many selective A3 receptor agonists e.g. N-(3-iodobenzyl)adenosine-5'-methyluronamide (IB-MECA) contain a 4'-ribosylalkylamide moiety. We found that this amide and other 4'-functional groups could be replaced with an isosteric isoxazole, and the target molecules retained potent binding to the recombinant human A3 receptor.
|
Binding affinity for adenosine A1 receptor as displacement of [3H]R-PIA from rat brain membranes at 10e-4 M
|
Rattus norvegicus
|
820.0
nM
|
|
Journal : J. Med. Chem.
Title : Structure-activity relationships and molecular modeling of 3, 5-diacyl-2,4-dialkylpyridine derivatives as selective A3 adenosine receptor antagonists.
Year : 1998
Volume : 41
Issue : 17
First Page : 3186
Last Page : 3201
Authors : Li AH, Moro S, Melman N, Ji XD, Jacobson KA.
Abstract : The structure-activity relationships of 6-phenyl-1,4-dihydropyridine derivatives as selective antagonists at human A3 adenosine receptors have been explored (Jiang et al. J. Med. Chem. 1997, 39, 4667-4675). In the present study, related pyridine derivatives have been synthesized and tested for affinity at adenosine receptors in radioligand binding assays. Ki values in the nanomolar range were observed for certain 3,5-diacyl-2,4-dialkyl-6-phenylpyridine derivatives in displacement of [125I]AB-MECA (N6-(4-amino-3-iodobenzyl)-5'-N-methylcarbamoyladenosine) at recombinant human A3 adenosine receptors. Selectivity for A3 adenosine receptors was determined vs radioligand binding at rat brain A1 and A2A receptors. Structure-activity relationships at various positions of the pyridine ring (the 3- and 5-acyl substituents and the 2- and 4-alkyl substituents) were probed. A 4-phenylethynyl group did not enhance A3 selectivity of pyridine derivatives, as it did for the 4-substituted dihydropyridines. At the 2- and 4-positions ethyl was favored over methyl. Also, unlike the dihydropyridines, a thioester group at the 3-position was favored over an ester for affinity at A3 adenosine receptors, and a 5-position benzyl ester decreased affinity. Small cycloalkyl groups at the 6-position of 4-phenylethynyl-1,4-dihydropyridines were favorable for high affinity at human A3 adenosine receptors, while in the pyridine series a 6-cyclopentyl group decreased affinity. 5-Ethyl 2, 4-diethyl-3-(ethylsulfanylcarbonyl)-6-phenylpyridine-5-carboxylate , 38, was highly potent at human A3 receptors, with a Ki value of 20 nM. A 4-propyl derivative, 39b, was selective and highly potent at both human and rat A3 receptors, with Ki values of 18.9 and 113 nM, respectively. A 6-(3-chlorophenyl) derivative, 44, displayed a Ki value of 7.94 nM at human A3 receptors and selectivity of 5200-fold. Molecular modeling, based on the steric and electrostatic alignment (SEAL) method, defined common pharmacophore elements for pyridine and dihydropyridine structures, e.g., the two ester groups and the 6-phenyl group. Moreover, a relationship between affinity and hydrophobicity was found for the pyridines.
|
Tested for the binding affinity of A1 receptor by displacing the [3H]-PIA in rat brain membranes
|
None
|
820.0
nM
|
|
Journal : J. Med. Chem.
Title : 2-Substitution of N6-benzyladenosine-5'-uronamides enhances selectivity for A3 adenosine receptors.
Year : 1994
Volume : 37
Issue : 21
First Page : 3614
Last Page : 3621
Authors : Kim HO, Ji XD, Siddiqi SM, Olah ME, Stiles GL, Jacobson KA.
Abstract : Adenosine derivatives bearing an N6-(3-iodobenzyl) group, reported to enhance the affinity of adenosine-5'-uronamide analogues as agonists at A3 adenosine receptors (J. Med. Chem. 1994, 37, 636-646), were synthesized starting from methyl beta-D-ribofuranoside in 10 steps. Binding affinities at A1 and A2a receptors in rat brain membranes and at cloned rat A3 receptors from stably transfected CHO cells were compared. N6-(3-Iodobenzyl)adenosine was 2-fold selective for A3 vs A1 or A2a receptors; thus it is the first monosubstituted adenosine analogue having any A3 selectivity. The effects of 2-substitution in combination with modifications at the N6- and 5'-positions were explored. 2-Chloro-N6-(3-iodobenzyl)adenosine had a Ki value of 1.4 nM and moderate selectivity for A3 receptors. 2-Chloro-N6-(3-iodobenzyl)adenosine- 5'-N-methyluronamide, which displayed a Ki value of 0.33 nM, was selective for A3 vs A1 and A2a receptors by 2500- and 1400-fold, respectively. It was 46,000-fold selective for A3 receptors vs the Na(+)-independent adenosine transporter, as indicated in displacement of [3H]N6-(4- nitrobenzyl)-thioinosine binding in rat brain membranes. In a functional assay in CHO cells, it inhibited adenylate cyclase via rat A3 receptors with an IC50 of 67 nM. 2-(Methylthio)-N6-(3-iodobenzyl)-adenosine-5'-N-methyluronamide and 2-(methylamino)-N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide were less potent, but nearly as selective for A3 receptors. Thus, 2-substitution (both small and sterically bulky) is well-tolerated at A3 receptors, and its A3 affinity-enhancing effects are additive with effects of uronamides at the 5'-position and a 3-iodobenzyl group at the N6-position.
|
Binding affinity using [125I]ABA against human Adenosine A3 receptor
|
Homo sapiens
|
14.0
nM
|
|
Journal : J. Med. Chem.
Title : 3'-Aminoadenosine-5'-uronamides: discovery of the first highly selective agonist at the human adenosine A3 receptor.
Year : 2003
Volume : 46
Issue : 3
First Page : 353
Last Page : 355
Authors : DeNinno MP, Masamune H, Chenard LK, DiRico KJ, Eller C, Etienne JB, Tickner JE, Kennedy SP, Knight DR, Kong J, Oleynek JJ, Tracey WR, Hill RJ.
Abstract : Selective adenosine A(3) agonists have potential utility for the prevention of perioperative myocardial ischemic injury. Herein, we report on the discovery and synthesis of compound 7. This amino nucleoside agonist possesses unprecedented levels of selectivity for the human adenosine A(3) receptor.
|
Binding affinity for rat adenosine A2A receptor of CHO cells using [3H]CGS-21680
|
Rattus norvegicus
|
470.0
nM
|
|
Journal : J. Med. Chem.
Title : N6-substituted D-4'-thioadenosine-5'-methyluronamides: potent and selective agonists at the human A3 adenosine receptor.
Year : 2003
Volume : 46
Issue : 18
First Page : 3775
Last Page : 3777
Authors : Jeong LS, Jin DZ, Kim HO, Shin DH, Moon HR, Gunaga P, Chun MW, Kim YC, Melman N, Gao ZG, Jacobson KA.
Abstract : 4'-Thio analogues 3-5 of Cl-IB-MECA (2) (K(i) = 1.0 +/- 0.2 nM at the human A(3) adenosine receptor) were synthesized from d-gulono-gamma-lactone via 4-thioribosyl acetate 14 as the key intermediate. All synthesized 4'-thionucleosides exhibited higher binding affinity to the human A(3) adenosine receptor than Cl-IB-MECA, among which 4 showed the most potent binding affinity (K(i) = 0.28 +/- 0.09 nM). 4 was also selective for A(3) vs human A(1) and human A(2A) receptors by 4800- and 36000-fold, respectively.
|
Binding affinity for adenosine A2A receptor as displacement of [3H]-CGS- 21680 from rat striatal membranes at 10e-4 M
|
Rattus norvegicus
|
470.0
nM
|
|
Journal : J. Med. Chem.
Title : Structure-activity relationships and molecular modeling of 3, 5-diacyl-2,4-dialkylpyridine derivatives as selective A3 adenosine receptor antagonists.
Year : 1998
Volume : 41
Issue : 17
First Page : 3186
Last Page : 3201
Authors : Li AH, Moro S, Melman N, Ji XD, Jacobson KA.
Abstract : The structure-activity relationships of 6-phenyl-1,4-dihydropyridine derivatives as selective antagonists at human A3 adenosine receptors have been explored (Jiang et al. J. Med. Chem. 1997, 39, 4667-4675). In the present study, related pyridine derivatives have been synthesized and tested for affinity at adenosine receptors in radioligand binding assays. Ki values in the nanomolar range were observed for certain 3,5-diacyl-2,4-dialkyl-6-phenylpyridine derivatives in displacement of [125I]AB-MECA (N6-(4-amino-3-iodobenzyl)-5'-N-methylcarbamoyladenosine) at recombinant human A3 adenosine receptors. Selectivity for A3 adenosine receptors was determined vs radioligand binding at rat brain A1 and A2A receptors. Structure-activity relationships at various positions of the pyridine ring (the 3- and 5-acyl substituents and the 2- and 4-alkyl substituents) were probed. A 4-phenylethynyl group did not enhance A3 selectivity of pyridine derivatives, as it did for the 4-substituted dihydropyridines. At the 2- and 4-positions ethyl was favored over methyl. Also, unlike the dihydropyridines, a thioester group at the 3-position was favored over an ester for affinity at A3 adenosine receptors, and a 5-position benzyl ester decreased affinity. Small cycloalkyl groups at the 6-position of 4-phenylethynyl-1,4-dihydropyridines were favorable for high affinity at human A3 adenosine receptors, while in the pyridine series a 6-cyclopentyl group decreased affinity. 5-Ethyl 2, 4-diethyl-3-(ethylsulfanylcarbonyl)-6-phenylpyridine-5-carboxylate , 38, was highly potent at human A3 receptors, with a Ki value of 20 nM. A 4-propyl derivative, 39b, was selective and highly potent at both human and rat A3 receptors, with Ki values of 18.9 and 113 nM, respectively. A 6-(3-chlorophenyl) derivative, 44, displayed a Ki value of 7.94 nM at human A3 receptors and selectivity of 5200-fold. Molecular modeling, based on the steric and electrostatic alignment (SEAL) method, defined common pharmacophore elements for pyridine and dihydropyridine structures, e.g., the two ester groups and the 6-phenyl group. Moreover, a relationship between affinity and hydrophobicity was found for the pyridines.
|
Binding affinity of adenosine derivative for endogenous rat Adenosine A3 receptor expressed on CHO cell
|
None
|
0.9
nM
|
|
Journal : J. Med. Chem.
Title : Structural determinants of A(3) adenosine receptor activation: nucleoside ligands at the agonist/antagonist boundary.
Year : 2002
Volume : 45
Issue : 20
First Page : 4471
Last Page : 4484
Authors : Gao ZG, Kim SK, Biadatti T, Chen W, Lee K, Barak D, Kim SG, Johnson CR, Jacobson KA.
Abstract : Mutagenesis of the human A(3) adenosine receptor (AR) suggested that certain amino acid residues contributed differently to ligand binding and activation processes. Here we demonstrated that various adenosine modifications, including adenine substitution and ribose ring constraints, also contributed differentially to these processes. The ligand effects on cyclic AMP production in intact CHO cells expressing the A(3)AR and in receptor binding were compared. Notably, the simple 2-fluoro group alone or 2-chloro in combination with N(6)-substitution dramatically diminished the efficacy of adenosine derivatives, even converting agonist into antagonist. Other affinity-increasing substitutions, including N(6)-(3-iodobenzyl) 4 and the (Northern)-methanocarba 15, also reduced efficacy, except in combination with a flexible 5'-uronamide. 2-Cl-N(6)-(3-iodobenzyl) derivatives, both in the (N)-methanocarba (i.e., of the Northern conformation) and riboside series 18 and 5, respectively, were potent antagonists with little residual agonism. Ring-constrained 2',3'-epoxide derivatives in both riboside and (N)-methanocarba series 13 and 21, respectively, and a cyclized (spiral) 4',5'-uronamide derivative 14 were synthesized and found to be human A(3)AR antagonists. 14 bound potently at both human (26 nM) and rat (49 nM) A(3)ARs. A rhodopsin-based A(3)AR model, containing all domains except the C-terminal region, indicated separate structural requirements for receptor binding and activation for these adenosine analogues. Ligand docking, taking into account binding of selected derivatives at mutant A(3)ARs, featured interactions of TM3 (His95) with the adenine moiety and TMs 6 and 7 with the ribose 5'-region. The 5'-OH group of antagonist N(6)-(3-iodobenzyl)-2-chloroadenosine 5 formed a H-bond with N274 but not with S271. The 5'-substituent of nucleoside antagonists moved toward TM7 and away from TM6. The conserved Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions at TM6 and TM7.
|
Binding affinity for rat Adenosine A3 receptor in CHO cells [125I]-iodo-AB-MECA
|
Rattus norvegicus
|
0.33
nM
|
|
Journal : J. Med. Chem.
Title : N6-substituted D-4'-thioadenosine-5'-methyluronamides: potent and selective agonists at the human A3 adenosine receptor.
Year : 2003
Volume : 46
Issue : 18
First Page : 3775
Last Page : 3777
Authors : Jeong LS, Jin DZ, Kim HO, Shin DH, Moon HR, Gunaga P, Chun MW, Kim YC, Melman N, Gao ZG, Jacobson KA.
Abstract : 4'-Thio analogues 3-5 of Cl-IB-MECA (2) (K(i) = 1.0 +/- 0.2 nM at the human A(3) adenosine receptor) were synthesized from d-gulono-gamma-lactone via 4-thioribosyl acetate 14 as the key intermediate. All synthesized 4'-thionucleosides exhibited higher binding affinity to the human A(3) adenosine receptor than Cl-IB-MECA, among which 4 showed the most potent binding affinity (K(i) = 0.28 +/- 0.09 nM). 4 was also selective for A(3) vs human A(1) and human A(2A) receptors by 4800- and 36000-fold, respectively.
|
Binding affinity for rat Adenosine A3 receptor
|
Rattus norvegicus
|
0.33
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design, synthesis and binding affinity of 3'-fluoro analogues of Cl-IB-MECA as adenosine A3 receptor ligands.
Year : 2003
Volume : 13
Issue : 5
First Page : 817
Last Page : 820
Authors : Lim MH, Kim HO, Moon HR, Lee SJ, Chun MW, Gao ZG, Melman N, Jacobson KA, Kim JH, Jeong LS.
Abstract : Several 3'-fluoro analogues, 1a, 1b, and 1c of selective and potent adenosine A(3) receptor agonist, Cl-IB-MECA were synthesized from D-xylose via highly regioselective opening of lyxo-epoxides, 8a and 8b with fluoride anion. Compared to the high binding affinity of Cl-IB-MECA to the A(3) adenosine receptor, the corresponding 3'-fluoro derivative showed remarkably decreased binding affinity, indicating that 3'-hydroxyl group acts as hydrogen bonding acceptor, not hydrogen bonding donor like fluorine atom in binding to the A(3) adenosine receptor.
|
Tested for the binding affinity of A3 receptor by displacing N6-[[125I]-4-amino-3-iodobenzyl]-adenosine-5''-N-methyluronamide from membranes of CHO cells transfected with rat A3-cDNA
|
None
|
0.33
nM
|
|
Journal : J. Med. Chem.
Title : 2-Substitution of N6-benzyladenosine-5'-uronamides enhances selectivity for A3 adenosine receptors.
Year : 1994
Volume : 37
Issue : 21
First Page : 3614
Last Page : 3621
Authors : Kim HO, Ji XD, Siddiqi SM, Olah ME, Stiles GL, Jacobson KA.
Abstract : Adenosine derivatives bearing an N6-(3-iodobenzyl) group, reported to enhance the affinity of adenosine-5'-uronamide analogues as agonists at A3 adenosine receptors (J. Med. Chem. 1994, 37, 636-646), were synthesized starting from methyl beta-D-ribofuranoside in 10 steps. Binding affinities at A1 and A2a receptors in rat brain membranes and at cloned rat A3 receptors from stably transfected CHO cells were compared. N6-(3-Iodobenzyl)adenosine was 2-fold selective for A3 vs A1 or A2a receptors; thus it is the first monosubstituted adenosine analogue having any A3 selectivity. The effects of 2-substitution in combination with modifications at the N6- and 5'-positions were explored. 2-Chloro-N6-(3-iodobenzyl)adenosine had a Ki value of 1.4 nM and moderate selectivity for A3 receptors. 2-Chloro-N6-(3-iodobenzyl)adenosine- 5'-N-methyluronamide, which displayed a Ki value of 0.33 nM, was selective for A3 vs A1 and A2a receptors by 2500- and 1400-fold, respectively. It was 46,000-fold selective for A3 receptors vs the Na(+)-independent adenosine transporter, as indicated in displacement of [3H]N6-(4- nitrobenzyl)-thioinosine binding in rat brain membranes. In a functional assay in CHO cells, it inhibited adenylate cyclase via rat A3 receptors with an IC50 of 67 nM. 2-(Methylthio)-N6-(3-iodobenzyl)-adenosine-5'-N-methyluronamide and 2-(methylamino)-N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide were less potent, but nearly as selective for A3 receptors. Thus, 2-substitution (both small and sterically bulky) is well-tolerated at A3 receptors, and its A3 affinity-enhancing effects are additive with effects of uronamides at the 5'-position and a 3-iodobenzyl group at the N6-position.
|
Binding affinity towards human Adenosine A3 receptor wild type
|
None
|
2.3
nM
|
|
Journal : J. Med. Chem.
Title : Structural determinants of A(3) adenosine receptor activation: nucleoside ligands at the agonist/antagonist boundary.
Year : 2002
Volume : 45
Issue : 20
First Page : 4471
Last Page : 4484
Authors : Gao ZG, Kim SK, Biadatti T, Chen W, Lee K, Barak D, Kim SG, Johnson CR, Jacobson KA.
Abstract : Mutagenesis of the human A(3) adenosine receptor (AR) suggested that certain amino acid residues contributed differently to ligand binding and activation processes. Here we demonstrated that various adenosine modifications, including adenine substitution and ribose ring constraints, also contributed differentially to these processes. The ligand effects on cyclic AMP production in intact CHO cells expressing the A(3)AR and in receptor binding were compared. Notably, the simple 2-fluoro group alone or 2-chloro in combination with N(6)-substitution dramatically diminished the efficacy of adenosine derivatives, even converting agonist into antagonist. Other affinity-increasing substitutions, including N(6)-(3-iodobenzyl) 4 and the (Northern)-methanocarba 15, also reduced efficacy, except in combination with a flexible 5'-uronamide. 2-Cl-N(6)-(3-iodobenzyl) derivatives, both in the (N)-methanocarba (i.e., of the Northern conformation) and riboside series 18 and 5, respectively, were potent antagonists with little residual agonism. Ring-constrained 2',3'-epoxide derivatives in both riboside and (N)-methanocarba series 13 and 21, respectively, and a cyclized (spiral) 4',5'-uronamide derivative 14 were synthesized and found to be human A(3)AR antagonists. 14 bound potently at both human (26 nM) and rat (49 nM) A(3)ARs. A rhodopsin-based A(3)AR model, containing all domains except the C-terminal region, indicated separate structural requirements for receptor binding and activation for these adenosine analogues. Ligand docking, taking into account binding of selected derivatives at mutant A(3)ARs, featured interactions of TM3 (His95) with the adenine moiety and TMs 6 and 7 with the ribose 5'-region. The 5'-OH group of antagonist N(6)-(3-iodobenzyl)-2-chloroadenosine 5 formed a H-bond with N274 but not with S271. The 5'-substituent of nucleoside antagonists moved toward TM7 and away from TM6. The conserved Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions at TM6 and TM7.
|
Binding affinity for adenosine A2a receptor as inhibition of 3[H]-CGS 21680 binding in rat striatum
|
Rattus norvegicus
|
56.0
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : The synthesis of new adenosine A3 selective ligands containing bioisosteric isoxazoles.
Year : 1998
Volume : 8
Issue : 13
First Page : 1767
Last Page : 1770
Authors : Mogensen JP, Roberts SM, Bowler AN, Thomsen C, Knutsen LJ.
Abstract : The synthesis and purinergic receptor binding of novel adenosine A3 ligands is described. Many selective A3 receptor agonists e.g. N-(3-iodobenzyl)adenosine-5'-methyluronamide (IB-MECA) contain a 4'-ribosylalkylamide moiety. We found that this amide and other 4'-functional groups could be replaced with an isosteric isoxazole, and the target molecules retained potent binding to the recombinant human A3 receptor.
|
Tested for the binding affinity of A2a receptor by displacing the [3H]-CGS- 21680 in rat striatal membranes
|
None
|
470.0
nM
|
|
Journal : J. Med. Chem.
Title : 2-Substitution of N6-benzyladenosine-5'-uronamides enhances selectivity for A3 adenosine receptors.
Year : 1994
Volume : 37
Issue : 21
First Page : 3614
Last Page : 3621
Authors : Kim HO, Ji XD, Siddiqi SM, Olah ME, Stiles GL, Jacobson KA.
Abstract : Adenosine derivatives bearing an N6-(3-iodobenzyl) group, reported to enhance the affinity of adenosine-5'-uronamide analogues as agonists at A3 adenosine receptors (J. Med. Chem. 1994, 37, 636-646), were synthesized starting from methyl beta-D-ribofuranoside in 10 steps. Binding affinities at A1 and A2a receptors in rat brain membranes and at cloned rat A3 receptors from stably transfected CHO cells were compared. N6-(3-Iodobenzyl)adenosine was 2-fold selective for A3 vs A1 or A2a receptors; thus it is the first monosubstituted adenosine analogue having any A3 selectivity. The effects of 2-substitution in combination with modifications at the N6- and 5'-positions were explored. 2-Chloro-N6-(3-iodobenzyl)adenosine had a Ki value of 1.4 nM and moderate selectivity for A3 receptors. 2-Chloro-N6-(3-iodobenzyl)adenosine- 5'-N-methyluronamide, which displayed a Ki value of 0.33 nM, was selective for A3 vs A1 and A2a receptors by 2500- and 1400-fold, respectively. It was 46,000-fold selective for A3 receptors vs the Na(+)-independent adenosine transporter, as indicated in displacement of [3H]N6-(4- nitrobenzyl)-thioinosine binding in rat brain membranes. In a functional assay in CHO cells, it inhibited adenylate cyclase via rat A3 receptors with an IC50 of 67 nM. 2-(Methylthio)-N6-(3-iodobenzyl)-adenosine-5'-N-methyluronamide and 2-(methylamino)-N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide were less potent, but nearly as selective for A3 receptors. Thus, 2-substitution (both small and sterically bulky) is well-tolerated at A3 receptors, and its A3 affinity-enhancing effects are additive with effects of uronamides at the 5'-position and a 3-iodobenzyl group at the N6-position.
|
Effect on forskolin-stimulated cyclic AMP production in intact chinese hamster ovary (CHO) cell expressing the human Adenosine A3 receptor
|
None
|
2.8
nM
|
|
Journal : J. Med. Chem.
Title : Structural determinants of A(3) adenosine receptor activation: nucleoside ligands at the agonist/antagonist boundary.
Year : 2002
Volume : 45
Issue : 20
First Page : 4471
Last Page : 4484
Authors : Gao ZG, Kim SK, Biadatti T, Chen W, Lee K, Barak D, Kim SG, Johnson CR, Jacobson KA.
Abstract : Mutagenesis of the human A(3) adenosine receptor (AR) suggested that certain amino acid residues contributed differently to ligand binding and activation processes. Here we demonstrated that various adenosine modifications, including adenine substitution and ribose ring constraints, also contributed differentially to these processes. The ligand effects on cyclic AMP production in intact CHO cells expressing the A(3)AR and in receptor binding were compared. Notably, the simple 2-fluoro group alone or 2-chloro in combination with N(6)-substitution dramatically diminished the efficacy of adenosine derivatives, even converting agonist into antagonist. Other affinity-increasing substitutions, including N(6)-(3-iodobenzyl) 4 and the (Northern)-methanocarba 15, also reduced efficacy, except in combination with a flexible 5'-uronamide. 2-Cl-N(6)-(3-iodobenzyl) derivatives, both in the (N)-methanocarba (i.e., of the Northern conformation) and riboside series 18 and 5, respectively, were potent antagonists with little residual agonism. Ring-constrained 2',3'-epoxide derivatives in both riboside and (N)-methanocarba series 13 and 21, respectively, and a cyclized (spiral) 4',5'-uronamide derivative 14 were synthesized and found to be human A(3)AR antagonists. 14 bound potently at both human (26 nM) and rat (49 nM) A(3)ARs. A rhodopsin-based A(3)AR model, containing all domains except the C-terminal region, indicated separate structural requirements for receptor binding and activation for these adenosine analogues. Ligand docking, taking into account binding of selected derivatives at mutant A(3)ARs, featured interactions of TM3 (His95) with the adenine moiety and TMs 6 and 7 with the ribose 5'-region. The 5'-OH group of antagonist N(6)-(3-iodobenzyl)-2-chloroadenosine 5 formed a H-bond with N274 but not with S271. The 5'-substituent of nucleoside antagonists moved toward TM7 and away from TM6. The conserved Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions at TM6 and TM7.
|
Affinity for human Adenosine A3 receptor expressed in CHO cell
|
None
|
1.4
nM
|
|
Journal : J. Med. Chem.
Title : Structural determinants of A(3) adenosine receptor activation: nucleoside ligands at the agonist/antagonist boundary.
Year : 2002
Volume : 45
Issue : 20
First Page : 4471
Last Page : 4484
Authors : Gao ZG, Kim SK, Biadatti T, Chen W, Lee K, Barak D, Kim SG, Johnson CR, Jacobson KA.
Abstract : Mutagenesis of the human A(3) adenosine receptor (AR) suggested that certain amino acid residues contributed differently to ligand binding and activation processes. Here we demonstrated that various adenosine modifications, including adenine substitution and ribose ring constraints, also contributed differentially to these processes. The ligand effects on cyclic AMP production in intact CHO cells expressing the A(3)AR and in receptor binding were compared. Notably, the simple 2-fluoro group alone or 2-chloro in combination with N(6)-substitution dramatically diminished the efficacy of adenosine derivatives, even converting agonist into antagonist. Other affinity-increasing substitutions, including N(6)-(3-iodobenzyl) 4 and the (Northern)-methanocarba 15, also reduced efficacy, except in combination with a flexible 5'-uronamide. 2-Cl-N(6)-(3-iodobenzyl) derivatives, both in the (N)-methanocarba (i.e., of the Northern conformation) and riboside series 18 and 5, respectively, were potent antagonists with little residual agonism. Ring-constrained 2',3'-epoxide derivatives in both riboside and (N)-methanocarba series 13 and 21, respectively, and a cyclized (spiral) 4',5'-uronamide derivative 14 were synthesized and found to be human A(3)AR antagonists. 14 bound potently at both human (26 nM) and rat (49 nM) A(3)ARs. A rhodopsin-based A(3)AR model, containing all domains except the C-terminal region, indicated separate structural requirements for receptor binding and activation for these adenosine analogues. Ligand docking, taking into account binding of selected derivatives at mutant A(3)ARs, featured interactions of TM3 (His95) with the adenine moiety and TMs 6 and 7 with the ribose 5'-region. The 5'-OH group of antagonist N(6)-(3-iodobenzyl)-2-chloroadenosine 5 formed a H-bond with N274 but not with S271. The 5'-substituent of nucleoside antagonists moved toward TM7 and away from TM6. The conserved Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions at TM6 and TM7.
|
Binding affinity at Mutant (H272E) human adenosine A3 receptor expressed in COS-7 cells
|
None
|
20.1
nM
|
|
Journal : J. Med. Chem.
Title : Neoceptor concept based on molecular complementarity in GPCRs: a mutant adenosine A(3) receptor with selectively enhanced affinity for amine-modified nucleosides.
Year : 2001
Volume : 44
Issue : 24
First Page : 4125
Last Page : 4136
Authors : Jacobson KA, Gao ZG, Chen A, Barak D, Kim SA, Lee K, Link A, Rompaey PV, van Calenbergh S, Liang BT.
Abstract : Adenosine A(3) receptors are of interest in the treatment of cardiac ischemia, inflammation, and neurodegenerative diseases. In an effort to create a unique receptor mutant that would be activated by tailor-made synthetic ligands, we mutated the human A(3) receptor at the site of a critical His residue in TM7, previously proposed to be involved in ligand recognition through interaction with the ribose moiety. The H272E mutant receptor displayed reduced affinity for most of the uncharged A(3) receptor agonists and antagonists examined. For example, the nonselective agonist 1a was 19-fold less potent at the mutant receptor than at the wild-type receptor. The introduction of an amino group on the ribose moiety of adenosine resulted in either equipotency or enhanced binding affinity at the H272E mutant relative to wild-type A(3) receptors, depending on the position of the amino group. 3'-Amino-3'-deoxyadenosine proved to be 7-fold more potent at the H272E mutant receptor than at the wild-type receptor, while the corresponding 2'- and 5'-amino analogues did not display significantly enhanced affinities. An 3'-amino-N(6)-iodobenzyl analogue showed only a small enhancement at the mutant (K(i) = 320 nM) vs wild-type receptors. The 3'-amino group was intended for a direct electrostatic interaction with the negatively charged ribose-binding region of the mutant receptor, yet molecular modeling did not support this notion. This design approach is an example of engineering the structure of mutant receptors to recognize synthetic ligands for which they are selectively matched on the basis of molecular complementarity between the mutant receptor and the ligand. We have termed such engineered receptors "neoceptors", since the ligand recognition profile of such mutant receptors need not correspond to the profile of the parent, native receptor.
|
Binding affinity at wild-type Adenosine A3 receptor expressed in COS-7 cells
|
None
|
4.3
nM
|
|
Journal : J. Med. Chem.
Title : Neoceptor concept based on molecular complementarity in GPCRs: a mutant adenosine A(3) receptor with selectively enhanced affinity for amine-modified nucleosides.
Year : 2001
Volume : 44
Issue : 24
First Page : 4125
Last Page : 4136
Authors : Jacobson KA, Gao ZG, Chen A, Barak D, Kim SA, Lee K, Link A, Rompaey PV, van Calenbergh S, Liang BT.
Abstract : Adenosine A(3) receptors are of interest in the treatment of cardiac ischemia, inflammation, and neurodegenerative diseases. In an effort to create a unique receptor mutant that would be activated by tailor-made synthetic ligands, we mutated the human A(3) receptor at the site of a critical His residue in TM7, previously proposed to be involved in ligand recognition through interaction with the ribose moiety. The H272E mutant receptor displayed reduced affinity for most of the uncharged A(3) receptor agonists and antagonists examined. For example, the nonselective agonist 1a was 19-fold less potent at the mutant receptor than at the wild-type receptor. The introduction of an amino group on the ribose moiety of adenosine resulted in either equipotency or enhanced binding affinity at the H272E mutant relative to wild-type A(3) receptors, depending on the position of the amino group. 3'-Amino-3'-deoxyadenosine proved to be 7-fold more potent at the H272E mutant receptor than at the wild-type receptor, while the corresponding 2'- and 5'-amino analogues did not display significantly enhanced affinities. An 3'-amino-N(6)-iodobenzyl analogue showed only a small enhancement at the mutant (K(i) = 320 nM) vs wild-type receptors. The 3'-amino group was intended for a direct electrostatic interaction with the negatively charged ribose-binding region of the mutant receptor, yet molecular modeling did not support this notion. This design approach is an example of engineering the structure of mutant receptors to recognize synthetic ligands for which they are selectively matched on the basis of molecular complementarity between the mutant receptor and the ligand. We have termed such engineered receptors "neoceptors", since the ligand recognition profile of such mutant receptors need not correspond to the profile of the parent, native receptor.
|
Binding affinity for human Adenosine A3 receptor in CHO cells using [125I]-iodo-AB-MECA
|
Homo sapiens
|
1.0
nM
|
|
Journal : J. Med. Chem.
Title : N6-substituted D-4'-thioadenosine-5'-methyluronamides: potent and selective agonists at the human A3 adenosine receptor.
Year : 2003
Volume : 46
Issue : 18
First Page : 3775
Last Page : 3777
Authors : Jeong LS, Jin DZ, Kim HO, Shin DH, Moon HR, Gunaga P, Chun MW, Kim YC, Melman N, Gao ZG, Jacobson KA.
Abstract : 4'-Thio analogues 3-5 of Cl-IB-MECA (2) (K(i) = 1.0 +/- 0.2 nM at the human A(3) adenosine receptor) were synthesized from d-gulono-gamma-lactone via 4-thioribosyl acetate 14 as the key intermediate. All synthesized 4'-thionucleosides exhibited higher binding affinity to the human A(3) adenosine receptor than Cl-IB-MECA, among which 4 showed the most potent binding affinity (K(i) = 0.28 +/- 0.09 nM). 4 was also selective for A(3) vs human A(1) and human A(2A) receptors by 4800- and 36000-fold, respectively.
|
Binding affinity for adenosine A3 receptor as inhibition of [125I]AB-MECA binding to human receptor expressed in HEK 293 cells
|
Homo sapiens
|
1.1
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : The synthesis of new adenosine A3 selective ligands containing bioisosteric isoxazoles.
Year : 1998
Volume : 8
Issue : 13
First Page : 1767
Last Page : 1770
Authors : Mogensen JP, Roberts SM, Bowler AN, Thomsen C, Knutsen LJ.
Abstract : The synthesis and purinergic receptor binding of novel adenosine A3 ligands is described. Many selective A3 receptor agonists e.g. N-(3-iodobenzyl)adenosine-5'-methyluronamide (IB-MECA) contain a 4'-ribosylalkylamide moiety. We found that this amide and other 4'-functional groups could be replaced with an isosteric isoxazole, and the target molecules retained potent binding to the recombinant human A3 receptor.
|
Binding affinity towards Adenosine A3 receptor (H95A mutant receptor)
|
None
|
60.0
nM
|
|
Journal : J. Med. Chem.
Title : Structural determinants of A(3) adenosine receptor activation: nucleoside ligands at the agonist/antagonist boundary.
Year : 2002
Volume : 45
Issue : 20
First Page : 4471
Last Page : 4484
Authors : Gao ZG, Kim SK, Biadatti T, Chen W, Lee K, Barak D, Kim SG, Johnson CR, Jacobson KA.
Abstract : Mutagenesis of the human A(3) adenosine receptor (AR) suggested that certain amino acid residues contributed differently to ligand binding and activation processes. Here we demonstrated that various adenosine modifications, including adenine substitution and ribose ring constraints, also contributed differentially to these processes. The ligand effects on cyclic AMP production in intact CHO cells expressing the A(3)AR and in receptor binding were compared. Notably, the simple 2-fluoro group alone or 2-chloro in combination with N(6)-substitution dramatically diminished the efficacy of adenosine derivatives, even converting agonist into antagonist. Other affinity-increasing substitutions, including N(6)-(3-iodobenzyl) 4 and the (Northern)-methanocarba 15, also reduced efficacy, except in combination with a flexible 5'-uronamide. 2-Cl-N(6)-(3-iodobenzyl) derivatives, both in the (N)-methanocarba (i.e., of the Northern conformation) and riboside series 18 and 5, respectively, were potent antagonists with little residual agonism. Ring-constrained 2',3'-epoxide derivatives in both riboside and (N)-methanocarba series 13 and 21, respectively, and a cyclized (spiral) 4',5'-uronamide derivative 14 were synthesized and found to be human A(3)AR antagonists. 14 bound potently at both human (26 nM) and rat (49 nM) A(3)ARs. A rhodopsin-based A(3)AR model, containing all domains except the C-terminal region, indicated separate structural requirements for receptor binding and activation for these adenosine analogues. Ligand docking, taking into account binding of selected derivatives at mutant A(3)ARs, featured interactions of TM3 (His95) with the adenine moiety and TMs 6 and 7 with the ribose 5'-region. The 5'-OH group of antagonist N(6)-(3-iodobenzyl)-2-chloroadenosine 5 formed a H-bond with N274 but not with S271. The 5'-substituent of nucleoside antagonists moved toward TM7 and away from TM6. The conserved Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions at TM6 and TM7.
|
Binding affinity towards Adenosine A3 receptor (W243 mutant) receptor
|
Homo sapiens
|
2.9
nM
|
|
Journal : J. Med. Chem.
Title : Structural determinants of A(3) adenosine receptor activation: nucleoside ligands at the agonist/antagonist boundary.
Year : 2002
Volume : 45
Issue : 20
First Page : 4471
Last Page : 4484
Authors : Gao ZG, Kim SK, Biadatti T, Chen W, Lee K, Barak D, Kim SG, Johnson CR, Jacobson KA.
Abstract : Mutagenesis of the human A(3) adenosine receptor (AR) suggested that certain amino acid residues contributed differently to ligand binding and activation processes. Here we demonstrated that various adenosine modifications, including adenine substitution and ribose ring constraints, also contributed differentially to these processes. The ligand effects on cyclic AMP production in intact CHO cells expressing the A(3)AR and in receptor binding were compared. Notably, the simple 2-fluoro group alone or 2-chloro in combination with N(6)-substitution dramatically diminished the efficacy of adenosine derivatives, even converting agonist into antagonist. Other affinity-increasing substitutions, including N(6)-(3-iodobenzyl) 4 and the (Northern)-methanocarba 15, also reduced efficacy, except in combination with a flexible 5'-uronamide. 2-Cl-N(6)-(3-iodobenzyl) derivatives, both in the (N)-methanocarba (i.e., of the Northern conformation) and riboside series 18 and 5, respectively, were potent antagonists with little residual agonism. Ring-constrained 2',3'-epoxide derivatives in both riboside and (N)-methanocarba series 13 and 21, respectively, and a cyclized (spiral) 4',5'-uronamide derivative 14 were synthesized and found to be human A(3)AR antagonists. 14 bound potently at both human (26 nM) and rat (49 nM) A(3)ARs. A rhodopsin-based A(3)AR model, containing all domains except the C-terminal region, indicated separate structural requirements for receptor binding and activation for these adenosine analogues. Ligand docking, taking into account binding of selected derivatives at mutant A(3)ARs, featured interactions of TM3 (His95) with the adenine moiety and TMs 6 and 7 with the ribose 5'-region. The 5'-OH group of antagonist N(6)-(3-iodobenzyl)-2-chloroadenosine 5 formed a H-bond with N274 but not with S271. The 5'-substituent of nucleoside antagonists moved toward TM7 and away from TM6. The conserved Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions at TM6 and TM7.
|
Displacement of [125I]AB-MECA from adenosine A3 receptor from HEK293 cell membranes
|
Homo sapiens
|
0.33
nM
|
|
Journal : J. Med. Chem.
Title : Structure-activity relationships and molecular modeling of 3, 5-diacyl-2,4-dialkylpyridine derivatives as selective A3 adenosine receptor antagonists.
Year : 1998
Volume : 41
Issue : 17
First Page : 3186
Last Page : 3201
Authors : Li AH, Moro S, Melman N, Ji XD, Jacobson KA.
Abstract : The structure-activity relationships of 6-phenyl-1,4-dihydropyridine derivatives as selective antagonists at human A3 adenosine receptors have been explored (Jiang et al. J. Med. Chem. 1997, 39, 4667-4675). In the present study, related pyridine derivatives have been synthesized and tested for affinity at adenosine receptors in radioligand binding assays. Ki values in the nanomolar range were observed for certain 3,5-diacyl-2,4-dialkyl-6-phenylpyridine derivatives in displacement of [125I]AB-MECA (N6-(4-amino-3-iodobenzyl)-5'-N-methylcarbamoyladenosine) at recombinant human A3 adenosine receptors. Selectivity for A3 adenosine receptors was determined vs radioligand binding at rat brain A1 and A2A receptors. Structure-activity relationships at various positions of the pyridine ring (the 3- and 5-acyl substituents and the 2- and 4-alkyl substituents) were probed. A 4-phenylethynyl group did not enhance A3 selectivity of pyridine derivatives, as it did for the 4-substituted dihydropyridines. At the 2- and 4-positions ethyl was favored over methyl. Also, unlike the dihydropyridines, a thioester group at the 3-position was favored over an ester for affinity at A3 adenosine receptors, and a 5-position benzyl ester decreased affinity. Small cycloalkyl groups at the 6-position of 4-phenylethynyl-1,4-dihydropyridines were favorable for high affinity at human A3 adenosine receptors, while in the pyridine series a 6-cyclopentyl group decreased affinity. 5-Ethyl 2, 4-diethyl-3-(ethylsulfanylcarbonyl)-6-phenylpyridine-5-carboxylate , 38, was highly potent at human A3 receptors, with a Ki value of 20 nM. A 4-propyl derivative, 39b, was selective and highly potent at both human and rat A3 receptors, with Ki values of 18.9 and 113 nM, respectively. A 6-(3-chlorophenyl) derivative, 44, displayed a Ki value of 7.94 nM at human A3 receptors and selectivity of 5200-fold. Molecular modeling, based on the steric and electrostatic alignment (SEAL) method, defined common pharmacophore elements for pyridine and dihydropyridine structures, e.g., the two ester groups and the 6-phenyl group. Moreover, a relationship between affinity and hydrophobicity was found for the pyridines.
|
Binding affinity for CHO cell membrane expressing human A3AR with GTPgammaS using [3H]8-ethyl-4-methyl-2-phenyl-(8R)-4,5,7,8-tetrahydro-1H-imidazo[2,1-i]-purin-5-one
|
Homo sapiens
|
6.3
nM
|
|
Journal : J. Med. Chem.
Title : Structural determinants of A(3) adenosine receptor activation: nucleoside ligands at the agonist/antagonist boundary.
Year : 2002
Volume : 45
Issue : 20
First Page : 4471
Last Page : 4484
Authors : Gao ZG, Kim SK, Biadatti T, Chen W, Lee K, Barak D, Kim SG, Johnson CR, Jacobson KA.
Abstract : Mutagenesis of the human A(3) adenosine receptor (AR) suggested that certain amino acid residues contributed differently to ligand binding and activation processes. Here we demonstrated that various adenosine modifications, including adenine substitution and ribose ring constraints, also contributed differentially to these processes. The ligand effects on cyclic AMP production in intact CHO cells expressing the A(3)AR and in receptor binding were compared. Notably, the simple 2-fluoro group alone or 2-chloro in combination with N(6)-substitution dramatically diminished the efficacy of adenosine derivatives, even converting agonist into antagonist. Other affinity-increasing substitutions, including N(6)-(3-iodobenzyl) 4 and the (Northern)-methanocarba 15, also reduced efficacy, except in combination with a flexible 5'-uronamide. 2-Cl-N(6)-(3-iodobenzyl) derivatives, both in the (N)-methanocarba (i.e., of the Northern conformation) and riboside series 18 and 5, respectively, were potent antagonists with little residual agonism. Ring-constrained 2',3'-epoxide derivatives in both riboside and (N)-methanocarba series 13 and 21, respectively, and a cyclized (spiral) 4',5'-uronamide derivative 14 were synthesized and found to be human A(3)AR antagonists. 14 bound potently at both human (26 nM) and rat (49 nM) A(3)ARs. A rhodopsin-based A(3)AR model, containing all domains except the C-terminal region, indicated separate structural requirements for receptor binding and activation for these adenosine analogues. Ligand docking, taking into account binding of selected derivatives at mutant A(3)ARs, featured interactions of TM3 (His95) with the adenine moiety and TMs 6 and 7 with the ribose 5'-region. The 5'-OH group of antagonist N(6)-(3-iodobenzyl)-2-chloroadenosine 5 formed a H-bond with N274 but not with S271. The 5'-substituent of nucleoside antagonists moved toward TM7 and away from TM6. The conserved Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions at TM6 and TM7.
|
Binding affinity for CHO cell membrane expressing human Adenosine A3 receptor using [3H]8-ethyl-4-methyl-2-phenyl-(8R)-4,5,7,8-tetrahydro-1H-imidazo[2,1-i]-purin-5-one
|
Homo sapiens
|
1.5
nM
|
|
Journal : J. Med. Chem.
Title : Structural determinants of A(3) adenosine receptor activation: nucleoside ligands at the agonist/antagonist boundary.
Year : 2002
Volume : 45
Issue : 20
First Page : 4471
Last Page : 4484
Authors : Gao ZG, Kim SK, Biadatti T, Chen W, Lee K, Barak D, Kim SG, Johnson CR, Jacobson KA.
Abstract : Mutagenesis of the human A(3) adenosine receptor (AR) suggested that certain amino acid residues contributed differently to ligand binding and activation processes. Here we demonstrated that various adenosine modifications, including adenine substitution and ribose ring constraints, also contributed differentially to these processes. The ligand effects on cyclic AMP production in intact CHO cells expressing the A(3)AR and in receptor binding were compared. Notably, the simple 2-fluoro group alone or 2-chloro in combination with N(6)-substitution dramatically diminished the efficacy of adenosine derivatives, even converting agonist into antagonist. Other affinity-increasing substitutions, including N(6)-(3-iodobenzyl) 4 and the (Northern)-methanocarba 15, also reduced efficacy, except in combination with a flexible 5'-uronamide. 2-Cl-N(6)-(3-iodobenzyl) derivatives, both in the (N)-methanocarba (i.e., of the Northern conformation) and riboside series 18 and 5, respectively, were potent antagonists with little residual agonism. Ring-constrained 2',3'-epoxide derivatives in both riboside and (N)-methanocarba series 13 and 21, respectively, and a cyclized (spiral) 4',5'-uronamide derivative 14 were synthesized and found to be human A(3)AR antagonists. 14 bound potently at both human (26 nM) and rat (49 nM) A(3)ARs. A rhodopsin-based A(3)AR model, containing all domains except the C-terminal region, indicated separate structural requirements for receptor binding and activation for these adenosine analogues. Ligand docking, taking into account binding of selected derivatives at mutant A(3)ARs, featured interactions of TM3 (His95) with the adenine moiety and TMs 6 and 7 with the ribose 5'-region. The 5'-OH group of antagonist N(6)-(3-iodobenzyl)-2-chloroadenosine 5 formed a H-bond with N274 but not with S271. The 5'-substituent of nucleoside antagonists moved toward TM7 and away from TM6. The conserved Trp243 (6.48) side chain, involved in recognition of the classical (nonnucleoside) A(3)AR antagonists but not adenosine-derived ligands, displayed a characteristic movement exclusively upon docking of agonists. Thus, A(3)AR activation appeared to require flexibility at the 5'- and 3'-positions, which was diminished in (N)-methanocarba, spiro, and epoxide analogues, and was characteristic of ribose interactions at TM6 and TM7.
|
Displacement of [125I]-AB MECA from recombinant human adenosine A3 receptor expressed in HEK cells
|
Homo sapiens
|
1.4
nM
|
|
Journal : J. Med. Chem.
Title : 2-Pyrazolyl-N(6)-substituted adenosine derivatives as high affinity and selective adenosine A(3) receptor agonists.
Year : 2004
Volume : 47
Issue : 19
First Page : 4766
Last Page : 4773
Authors : Elzein E, Palle V, Wu Y, Maa T, Zeng D, Zablocki J.
Abstract : We describe the synthesis of new high affinity and selective A(3)-adenosine receptor (A(3)-AdoR) agonists. Introduction of a methyl group at the N(6)-position of the A(2A)-AdoR selective 2-pyrazolyl-adenosine analogues (Figure 2) brought about a substantial increase in the A(3)-AdoR binding affinity and selectivity. While the N(6)-desmethyl analogues 3a and 4 were inactive at the A(3)-AdoR (K(i) > 10 microM), the corresponding N(6)-methyl analogues 5 and 22 showed good binding affinity at the A(3)-AdoR (K(i) = 73 and 97 nM, respectively). Replacement of the carboxamide group in 5 with different heteroaryl groups resulted in analogues with high affinities and selectivity for the A(3)-AdoR. (2R,3S,4R)-tetrahydro-2-(hydroxymethyl)-5-(6-(methylamino)-2-(4-(pyridin-2-yl)-1H-pyrazol-1-yl)-9H-purin-9-yl)furan-3,4-diol (15, K(i) = 2 nM) displayed high selectivity for the A(3)-AdoR versus A(1)- and A(2A)-AdoRs (selectivity ratios of 1900 and >2000, respectively).
|
Inhibition of [3H]R-PIA binding to human Adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
220.0
nM
|
|
Journal : J. Med. Chem.
Title : (N)-methanocarba 2,N6-disubstituted adenine nucleosides as highly potent and selective A3 adenosine receptor agonists.
Year : 2005
Volume : 48
Issue : 6
First Page : 1745
Last Page : 1758
Authors : Tchilibon S, Joshi BV, Kim SK, Duong HT, Gao ZG, Jacobson KA.
Abstract : A series of ring-constrained (N)-methanocarba-5'-uronamide 2,N(6)-disubstituted adenine nucleosides have been synthesized via Mitsunobu condensation of the nucleobase precursor with a pseudosugar ring containing a 5'-ester functionality. Following appropriate functionalization of the adenine ring, the ester group was converted to the 5'-N-methylamide. The compounds, mainly 2-chloro-substituted derivatives, were tested in both binding and functional assays at human adenosine receptors (ARs), and many were found to be highly potent and selective A(3)AR agonists. Selected compounds were compared in binding to the rat A(3)AR to assess their viability for testing in rat disease models. The N(6)-(3-chlorobenzyl) and N(6)-(3-bromobenzyl) analogues displayed K(i) values at the human A(3)AR of 0.29 and 0.38 nM, respectively. Other subnanomolar affinities were observed for the following N(6) derivatives: 2,5-dichlorobenzyl, 5-iodo-2-methoxybenzyl, trans-2-phenyl-1-cyclopropyl, and 2,2-diphenylethyl. Selectivity for the human A(3)AR in comparison to the A(1)AR was the following (fold): the N(6)-(2,2-diphenylethyl) analogue 34 (1900), the N(6)-(2,5-dimethoxybenzyl) analogue 26 (1200), the N(6)-(2,5-dichlorobenzyl) and N(6)-(2-phenyl-1-cyclopropyl) analogues 20 and 33 (1000), and the N(6)-(3-substituted benzyl) analogues 17, 18, 28, and 29 (700-900). Typically, even greater selectivity ratios were obtained in comparison with the A(2A) and A(2B)ARs. The (N)-methanocarba-5'-uronamide analogues were full agonists at the A(3)AR, as indicated by the inhibition of forskolin-stimluated adenylate cyclase at a concentration of 10 microM. The N(6)-(2,2-diphenylethyl) derivative was an A(3)AR agonist in the (N)-methanocarba-5'-uronamide series, although it was an antagonist in the ribose series. Thus, many of the previously known groups that enhance A(3)AR affinity in the 9-riboside series, including those that reduce intrinsic efficacy, may be adapted to the (N)-methanocarba nucleoside series of full agonists.
|
Inhibition of [125I]AB-MECA binding to rat Adenosine A3 receptor expressed in CHO cells
|
Rattus norvegicus
|
0.33
nM
|
|
Journal : J. Med. Chem.
Title : (N)-methanocarba 2,N6-disubstituted adenine nucleosides as highly potent and selective A3 adenosine receptor agonists.
Year : 2005
Volume : 48
Issue : 6
First Page : 1745
Last Page : 1758
Authors : Tchilibon S, Joshi BV, Kim SK, Duong HT, Gao ZG, Jacobson KA.
Abstract : A series of ring-constrained (N)-methanocarba-5'-uronamide 2,N(6)-disubstituted adenine nucleosides have been synthesized via Mitsunobu condensation of the nucleobase precursor with a pseudosugar ring containing a 5'-ester functionality. Following appropriate functionalization of the adenine ring, the ester group was converted to the 5'-N-methylamide. The compounds, mainly 2-chloro-substituted derivatives, were tested in both binding and functional assays at human adenosine receptors (ARs), and many were found to be highly potent and selective A(3)AR agonists. Selected compounds were compared in binding to the rat A(3)AR to assess their viability for testing in rat disease models. The N(6)-(3-chlorobenzyl) and N(6)-(3-bromobenzyl) analogues displayed K(i) values at the human A(3)AR of 0.29 and 0.38 nM, respectively. Other subnanomolar affinities were observed for the following N(6) derivatives: 2,5-dichlorobenzyl, 5-iodo-2-methoxybenzyl, trans-2-phenyl-1-cyclopropyl, and 2,2-diphenylethyl. Selectivity for the human A(3)AR in comparison to the A(1)AR was the following (fold): the N(6)-(2,2-diphenylethyl) analogue 34 (1900), the N(6)-(2,5-dimethoxybenzyl) analogue 26 (1200), the N(6)-(2,5-dichlorobenzyl) and N(6)-(2-phenyl-1-cyclopropyl) analogues 20 and 33 (1000), and the N(6)-(3-substituted benzyl) analogues 17, 18, 28, and 29 (700-900). Typically, even greater selectivity ratios were obtained in comparison with the A(2A) and A(2B)ARs. The (N)-methanocarba-5'-uronamide analogues were full agonists at the A(3)AR, as indicated by the inhibition of forskolin-stimluated adenylate cyclase at a concentration of 10 microM. The N(6)-(2,2-diphenylethyl) derivative was an A(3)AR agonist in the (N)-methanocarba-5'-uronamide series, although it was an antagonist in the ribose series. Thus, many of the previously known groups that enhance A(3)AR affinity in the 9-riboside series, including those that reduce intrinsic efficacy, may be adapted to the (N)-methanocarba nucleoside series of full agonists.
|
Inhibition of [125I]-AB-MECA binding to human Adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
1.4
nM
|
|
Journal : J. Med. Chem.
Title : (N)-methanocarba 2,N6-disubstituted adenine nucleosides as highly potent and selective A3 adenosine receptor agonists.
Year : 2005
Volume : 48
Issue : 6
First Page : 1745
Last Page : 1758
Authors : Tchilibon S, Joshi BV, Kim SK, Duong HT, Gao ZG, Jacobson KA.
Abstract : A series of ring-constrained (N)-methanocarba-5'-uronamide 2,N(6)-disubstituted adenine nucleosides have been synthesized via Mitsunobu condensation of the nucleobase precursor with a pseudosugar ring containing a 5'-ester functionality. Following appropriate functionalization of the adenine ring, the ester group was converted to the 5'-N-methylamide. The compounds, mainly 2-chloro-substituted derivatives, were tested in both binding and functional assays at human adenosine receptors (ARs), and many were found to be highly potent and selective A(3)AR agonists. Selected compounds were compared in binding to the rat A(3)AR to assess their viability for testing in rat disease models. The N(6)-(3-chlorobenzyl) and N(6)-(3-bromobenzyl) analogues displayed K(i) values at the human A(3)AR of 0.29 and 0.38 nM, respectively. Other subnanomolar affinities were observed for the following N(6) derivatives: 2,5-dichlorobenzyl, 5-iodo-2-methoxybenzyl, trans-2-phenyl-1-cyclopropyl, and 2,2-diphenylethyl. Selectivity for the human A(3)AR in comparison to the A(1)AR was the following (fold): the N(6)-(2,2-diphenylethyl) analogue 34 (1900), the N(6)-(2,5-dimethoxybenzyl) analogue 26 (1200), the N(6)-(2,5-dichlorobenzyl) and N(6)-(2-phenyl-1-cyclopropyl) analogues 20 and 33 (1000), and the N(6)-(3-substituted benzyl) analogues 17, 18, 28, and 29 (700-900). Typically, even greater selectivity ratios were obtained in comparison with the A(2A) and A(2B)ARs. The (N)-methanocarba-5'-uronamide analogues were full agonists at the A(3)AR, as indicated by the inhibition of forskolin-stimluated adenylate cyclase at a concentration of 10 microM. The N(6)-(2,2-diphenylethyl) derivative was an A(3)AR agonist in the (N)-methanocarba-5'-uronamide series, although it was an antagonist in the ribose series. Thus, many of the previously known groups that enhance A(3)AR affinity in the 9-riboside series, including those that reduce intrinsic efficacy, may be adapted to the (N)-methanocarba nucleoside series of full agonists.
|
Displacement of [3H]CHA binding to Adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
823.0
nM
|
|
Journal : J. Med. Chem.
Title : Synthesis and biological evaluation of novel N6-[4-(substituted)sulfonamidophenylcarbamoyl]adenosine-5'-uronamides as A3 adenosine receptor agonists.
Year : 2004
Volume : 47
Issue : 22
First Page : 5535
Last Page : 5540
Authors : Baraldi PG, Fruttarolo F, Tabrizi MA, Romagnoli R, Preti D, Bovero A, Pineda de Las Infantas MJ, Moorman A, Varani K, Borea PA.
Abstract : A new series of 1-deoxy-1-[(6-(4-(substituted-aminosulfonyl)phenyl)amino)carbonylamino-9H-purin-9-yl]-N-ethyl-beta-D-ribofuranuronamides (83-102) have been synthesized and tested at the human A3 adenosine receptor subtype. All the derivatives described in this work displayed affinity versus this receptor in the nanomolar range and good selectivity versus A1 adenosine receptor subtype, confirming that the p-sulfonamido moiety positively affected the activity of the molecules. The best substituents at the sulfonamido nucleus were found to be small alkyl groups, like methyl, isopropyl, ethyl, or allyl moieties (compounds 96-100), whereas monosubstitution at the amino group led to a decrease in A3 affinity values. The selectivity versus A1 adenosine receptor subtype is increased when the amino group in the sulfonamido core is represented by a hydrogenated heterocyclic ring like piperidine, morpholine, or pyrroline. Bulky groups, like adamantane and alkyl chains with more than four carbon atoms, are detrimental for the affinity and the selectivity of the A3 adenosine receptor agonists described here.
|
Displacement of [3H]CGS-21680 binding to Adenosine A2 receptor expressed in CHO cells
|
Homo sapiens
|
448.0
nM
|
|
Journal : J. Med. Chem.
Title : Synthesis and biological evaluation of novel N6-[4-(substituted)sulfonamidophenylcarbamoyl]adenosine-5'-uronamides as A3 adenosine receptor agonists.
Year : 2004
Volume : 47
Issue : 22
First Page : 5535
Last Page : 5540
Authors : Baraldi PG, Fruttarolo F, Tabrizi MA, Romagnoli R, Preti D, Bovero A, Pineda de Las Infantas MJ, Moorman A, Varani K, Borea PA.
Abstract : A new series of 1-deoxy-1-[(6-(4-(substituted-aminosulfonyl)phenyl)amino)carbonylamino-9H-purin-9-yl]-N-ethyl-beta-D-ribofuranuronamides (83-102) have been synthesized and tested at the human A3 adenosine receptor subtype. All the derivatives described in this work displayed affinity versus this receptor in the nanomolar range and good selectivity versus A1 adenosine receptor subtype, confirming that the p-sulfonamido moiety positively affected the activity of the molecules. The best substituents at the sulfonamido nucleus were found to be small alkyl groups, like methyl, isopropyl, ethyl, or allyl moieties (compounds 96-100), whereas monosubstitution at the amino group led to a decrease in A3 affinity values. The selectivity versus A1 adenosine receptor subtype is increased when the amino group in the sulfonamido core is represented by a hydrogenated heterocyclic ring like piperidine, morpholine, or pyrroline. Bulky groups, like adamantane and alkyl chains with more than four carbon atoms, are detrimental for the affinity and the selectivity of the A3 adenosine receptor agonists described here.
|
Displacement of [125I]AB-MECA binding to Adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
0.33
nM
|
|
Journal : J. Med. Chem.
Title : Synthesis and biological evaluation of novel N6-[4-(substituted)sulfonamidophenylcarbamoyl]adenosine-5'-uronamides as A3 adenosine receptor agonists.
Year : 2004
Volume : 47
Issue : 22
First Page : 5535
Last Page : 5540
Authors : Baraldi PG, Fruttarolo F, Tabrizi MA, Romagnoli R, Preti D, Bovero A, Pineda de Las Infantas MJ, Moorman A, Varani K, Borea PA.
Abstract : A new series of 1-deoxy-1-[(6-(4-(substituted-aminosulfonyl)phenyl)amino)carbonylamino-9H-purin-9-yl]-N-ethyl-beta-D-ribofuranuronamides (83-102) have been synthesized and tested at the human A3 adenosine receptor subtype. All the derivatives described in this work displayed affinity versus this receptor in the nanomolar range and good selectivity versus A1 adenosine receptor subtype, confirming that the p-sulfonamido moiety positively affected the activity of the molecules. The best substituents at the sulfonamido nucleus were found to be small alkyl groups, like methyl, isopropyl, ethyl, or allyl moieties (compounds 96-100), whereas monosubstitution at the amino group led to a decrease in A3 affinity values. The selectivity versus A1 adenosine receptor subtype is increased when the amino group in the sulfonamido core is represented by a hydrogenated heterocyclic ring like piperidine, morpholine, or pyrroline. Bulky groups, like adamantane and alkyl chains with more than four carbon atoms, are detrimental for the affinity and the selectivity of the A3 adenosine receptor agonists described here.
|
Binding affinity towards recombinant human Adenosine A1 receptor was determined using [3H]R-PIA (2.0 nM) as radioligand
|
Homo sapiens
|
222.0
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design and synthesis of 3'-ureidoadenosine-5'-uronamides: effects of the 3'-ureido group on binding to the A3 adenosine receptor.
Year : 2004
Volume : 14
Issue : 19
First Page : 4851
Last Page : 4854
Authors : Jeong LS, Kim MJ, Kim HO, Gao ZG, Kim SK, Jacobson KA, Chun MW.
Abstract : On the basis of high binding affinity at the A(3) adenosine receptor of 3'-aminoadenosine derivatives with hydrogen bonding donor ability, novel 3'-ureidoadenosine analogues were synthesized from 1,2:5,6-di-O-isopropylidene-d-glucose in order to lead to stronger hydrogen bonding than the corresponding 3'-aminoadenosine derivatives. However, the synthesized 3'-ureidoadenosine analogues were totally devoid of binding affinity, because 3'-urea moiety caused steric and electrostatic repulsions at the binding site of the A(3) adenosine receptor, leading to conformational distortion.
|
Displacement of [3H]DPCPX binding to adenosine A1 receptors of bovine cortical membranes
|
Bos taurus
|
890.0
nM
|
|
Journal : J. Med. Chem.
Title : Synthesis, biological evaluation, and molecular modeling of ribose-modified adenosine analogues as adenosine receptor agonists.
Year : 2005
Volume : 48
Issue : 5
First Page : 1550
Last Page : 1562
Authors : Cappellacci L, Franchetti P, Pasqualini M, Petrelli R, Vita P, Lavecchia A, Novellino E, Costa B, Martini C, Klotz KN, Grifantini M.
Abstract : A number of 3'-C-methyl analogues of selective adenosine receptor agonists such as CPA, CHA, CCPA, 2'-Me-CCPA, NECA, and IB-MECA was synthesized to further investigate the subdomain of the receptor that binds the ribose moiety of the ligands. Affinity data at A(1), A(2A), and A(3) receptors in bovine brain membranes showed that the 3'-C-modification in adenosine resulted in a decrease of the affinity at all three receptor subtypes. When this modification was combined with N(6)-substitution with groups that induce high potency and selectivity at A(1) receptor, the affinity and selectivity were increased. However, all 3'-C-methyl derivatives proved to be very less active than the corresponding 2'-C-methyl analogues. The most active compound was found to be 3'-Me-CPA which displayed a K(i) value of 0.35 microM at A(1) receptor and a selectivity for A(1) vs A(2A) and A(3) receptors higher than 28-fold. 2'-Me-CCPA was confirmed to be the most selective, high affinity agonist so far known also at human A(1) receptor with a K(i) value of 3.3 nM and 2903- and 341-fold selective vs human A(2A) and A(3) receptors, respectively. In functional assay, 3'-Me-CPA, 3'-Me-CCPA, and 2-Cl-3'-Me-IB-MECA inhibited forskolin-stimulated adenylyl cyclase activity with IC(50) values ranging from 0.3 to 4.9 microM, acting as full agonists. A rhodopsin-based model of the bovine A(1)AR was built to rationalize the higher affinity and selectivity of 2'-C-methyl derivatives of N(6)-substituted-adenosine compared to that of 3'-C-methyl analogues. In the docking exploration, it was found that 2'-Me-CCPA was able to form a number of interactions with several polar residues in the transmembrane helices TM-3, TM-6, and TM-7 of bA(1)AR which were not preserved in the molecular dynamics simulation of 3'-Me-CCPA/bA(1)AR complex.
|
Displacement of [3H]CGS-21680 binding to adenosine A2A receptors of bovine striatal membranes
|
Bos taurus
|
401.0
nM
|
|
Journal : J. Med. Chem.
Title : Synthesis, biological evaluation, and molecular modeling of ribose-modified adenosine analogues as adenosine receptor agonists.
Year : 2005
Volume : 48
Issue : 5
First Page : 1550
Last Page : 1562
Authors : Cappellacci L, Franchetti P, Pasqualini M, Petrelli R, Vita P, Lavecchia A, Novellino E, Costa B, Martini C, Klotz KN, Grifantini M.
Abstract : A number of 3'-C-methyl analogues of selective adenosine receptor agonists such as CPA, CHA, CCPA, 2'-Me-CCPA, NECA, and IB-MECA was synthesized to further investigate the subdomain of the receptor that binds the ribose moiety of the ligands. Affinity data at A(1), A(2A), and A(3) receptors in bovine brain membranes showed that the 3'-C-modification in adenosine resulted in a decrease of the affinity at all three receptor subtypes. When this modification was combined with N(6)-substitution with groups that induce high potency and selectivity at A(1) receptor, the affinity and selectivity were increased. However, all 3'-C-methyl derivatives proved to be very less active than the corresponding 2'-C-methyl analogues. The most active compound was found to be 3'-Me-CPA which displayed a K(i) value of 0.35 microM at A(1) receptor and a selectivity for A(1) vs A(2A) and A(3) receptors higher than 28-fold. 2'-Me-CCPA was confirmed to be the most selective, high affinity agonist so far known also at human A(1) receptor with a K(i) value of 3.3 nM and 2903- and 341-fold selective vs human A(2A) and A(3) receptors, respectively. In functional assay, 3'-Me-CPA, 3'-Me-CCPA, and 2-Cl-3'-Me-IB-MECA inhibited forskolin-stimulated adenylyl cyclase activity with IC(50) values ranging from 0.3 to 4.9 microM, acting as full agonists. A rhodopsin-based model of the bovine A(1)AR was built to rationalize the higher affinity and selectivity of 2'-C-methyl derivatives of N(6)-substituted-adenosine compared to that of 3'-C-methyl analogues. In the docking exploration, it was found that 2'-Me-CCPA was able to form a number of interactions with several polar residues in the transmembrane helices TM-3, TM-6, and TM-7 of bA(1)AR which were not preserved in the molecular dynamics simulation of 3'-Me-CCPA/bA(1)AR complex.
|
Displacement of [125I]AB-MECA from adenosine A3 receptors in bovine cortical membranes
|
Bos taurus
|
0.22
nM
|
|
Journal : J. Med. Chem.
Title : Synthesis, biological evaluation, and molecular modeling of ribose-modified adenosine analogues as adenosine receptor agonists.
Year : 2005
Volume : 48
Issue : 5
First Page : 1550
Last Page : 1562
Authors : Cappellacci L, Franchetti P, Pasqualini M, Petrelli R, Vita P, Lavecchia A, Novellino E, Costa B, Martini C, Klotz KN, Grifantini M.
Abstract : A number of 3'-C-methyl analogues of selective adenosine receptor agonists such as CPA, CHA, CCPA, 2'-Me-CCPA, NECA, and IB-MECA was synthesized to further investigate the subdomain of the receptor that binds the ribose moiety of the ligands. Affinity data at A(1), A(2A), and A(3) receptors in bovine brain membranes showed that the 3'-C-modification in adenosine resulted in a decrease of the affinity at all three receptor subtypes. When this modification was combined with N(6)-substitution with groups that induce high potency and selectivity at A(1) receptor, the affinity and selectivity were increased. However, all 3'-C-methyl derivatives proved to be very less active than the corresponding 2'-C-methyl analogues. The most active compound was found to be 3'-Me-CPA which displayed a K(i) value of 0.35 microM at A(1) receptor and a selectivity for A(1) vs A(2A) and A(3) receptors higher than 28-fold. 2'-Me-CCPA was confirmed to be the most selective, high affinity agonist so far known also at human A(1) receptor with a K(i) value of 3.3 nM and 2903- and 341-fold selective vs human A(2A) and A(3) receptors, respectively. In functional assay, 3'-Me-CPA, 3'-Me-CCPA, and 2-Cl-3'-Me-IB-MECA inhibited forskolin-stimulated adenylyl cyclase activity with IC(50) values ranging from 0.3 to 4.9 microM, acting as full agonists. A rhodopsin-based model of the bovine A(1)AR was built to rationalize the higher affinity and selectivity of 2'-C-methyl derivatives of N(6)-substituted-adenosine compared to that of 3'-C-methyl analogues. In the docking exploration, it was found that 2'-Me-CCPA was able to form a number of interactions with several polar residues in the transmembrane helices TM-3, TM-6, and TM-7 of bA(1)AR which were not preserved in the molecular dynamics simulation of 3'-Me-CCPA/bA(1)AR complex.
|
Binding affinity towards human Adenosine A3 receptor stably transfected in CHO cells was determined using [125I]I-AB-MECA (1.0 nM) as radioligand
|
Homo sapiens
|
1.4
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design and synthesis of 3'-ureidoadenosine-5'-uronamides: effects of the 3'-ureido group on binding to the A3 adenosine receptor.
Year : 2004
Volume : 14
Issue : 19
First Page : 4851
Last Page : 4854
Authors : Jeong LS, Kim MJ, Kim HO, Gao ZG, Kim SK, Jacobson KA, Chun MW.
Abstract : On the basis of high binding affinity at the A(3) adenosine receptor of 3'-aminoadenosine derivatives with hydrogen bonding donor ability, novel 3'-ureidoadenosine analogues were synthesized from 1,2:5,6-di-O-isopropylidene-d-glucose in order to lead to stronger hydrogen bonding than the corresponding 3'-aminoadenosine derivatives. However, the synthesized 3'-ureidoadenosine analogues were totally devoid of binding affinity, because 3'-urea moiety caused steric and electrostatic repulsions at the binding site of the A(3) adenosine receptor, leading to conformational distortion.
|
Inhibition of (10 uM) forskolin-mediated cAMP production in CHO cells expressing human Adenosine A3 receptor
|
Homo sapiens
|
2.2
nM
|
|
Journal : J. Med. Chem.
Title : Synthesis and biological evaluation of novel N6-[4-(substituted)sulfonamidophenylcarbamoyl]adenosine-5'-uronamides as A3 adenosine receptor agonists.
Year : 2004
Volume : 47
Issue : 22
First Page : 5535
Last Page : 5540
Authors : Baraldi PG, Fruttarolo F, Tabrizi MA, Romagnoli R, Preti D, Bovero A, Pineda de Las Infantas MJ, Moorman A, Varani K, Borea PA.
Abstract : A new series of 1-deoxy-1-[(6-(4-(substituted-aminosulfonyl)phenyl)amino)carbonylamino-9H-purin-9-yl]-N-ethyl-beta-D-ribofuranuronamides (83-102) have been synthesized and tested at the human A3 adenosine receptor subtype. All the derivatives described in this work displayed affinity versus this receptor in the nanomolar range and good selectivity versus A1 adenosine receptor subtype, confirming that the p-sulfonamido moiety positively affected the activity of the molecules. The best substituents at the sulfonamido nucleus were found to be small alkyl groups, like methyl, isopropyl, ethyl, or allyl moieties (compounds 96-100), whereas monosubstitution at the amino group led to a decrease in A3 affinity values. The selectivity versus A1 adenosine receptor subtype is increased when the amino group in the sulfonamido core is represented by a hydrogenated heterocyclic ring like piperidine, morpholine, or pyrroline. Bulky groups, like adamantane and alkyl chains with more than four carbon atoms, are detrimental for the affinity and the selectivity of the A3 adenosine receptor agonists described here.
|
Displacement of [125I]ABA from human adenosine A1 receptor expressed in HEK cells
|
Homo sapiens
|
5.26
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : N6-ethyl-2-alkynyl NECAs, selective human A3 adenosine receptor agonists.
Year : 2006
Volume : 16
Issue : 9
First Page : 2416
Last Page : 2418
Authors : Zhu R, Frazier CR, Linden J, Macdonald TL.
Abstract : A series of N6-ethyl-2-alkynyl NECA (5'-N-ethylcarboxamidoadenosine) analogs were synthesized and their binding affinity with the four human adenosine receptors was evaluated. One of the compounds ZR1121 shows high affinity with hA3 receptor and its selectivity over hA1 receptor is 1-2 log orders greater than IB-MECA or Cl-IB-MECA, the currently employed selective A3 agonists.
|
Displacement of [125I]ZM-241385 from human adenosine A2A receptor in HEK cells at 100 uM
|
Homo sapiens
|
50.0
%
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : N6-ethyl-2-alkynyl NECAs, selective human A3 adenosine receptor agonists.
Year : 2006
Volume : 16
Issue : 9
First Page : 2416
Last Page : 2418
Authors : Zhu R, Frazier CR, Linden J, Macdonald TL.
Abstract : A series of N6-ethyl-2-alkynyl NECA (5'-N-ethylcarboxamidoadenosine) analogs were synthesized and their binding affinity with the four human adenosine receptors was evaluated. One of the compounds ZR1121 shows high affinity with hA3 receptor and its selectivity over hA1 receptor is 1-2 log orders greater than IB-MECA or Cl-IB-MECA, the currently employed selective A3 agonists.
|
Displacement of [125I]ABOPX from human adenosine A2B receptor in HEK cells at 100 uM
|
Homo sapiens
|
50.0
%
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : N6-ethyl-2-alkynyl NECAs, selective human A3 adenosine receptor agonists.
Year : 2006
Volume : 16
Issue : 9
First Page : 2416
Last Page : 2418
Authors : Zhu R, Frazier CR, Linden J, Macdonald TL.
Abstract : A series of N6-ethyl-2-alkynyl NECA (5'-N-ethylcarboxamidoadenosine) analogs were synthesized and their binding affinity with the four human adenosine receptors was evaluated. One of the compounds ZR1121 shows high affinity with hA3 receptor and its selectivity over hA1 receptor is 1-2 log orders greater than IB-MECA or Cl-IB-MECA, the currently employed selective A3 agonists.
|
Displacement of [125I]ABA from human adenosine A3 receptor expressed in HEK cells
|
Homo sapiens
|
0.637
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : N6-ethyl-2-alkynyl NECAs, selective human A3 adenosine receptor agonists.
Year : 2006
Volume : 16
Issue : 9
First Page : 2416
Last Page : 2418
Authors : Zhu R, Frazier CR, Linden J, Macdonald TL.
Abstract : A series of N6-ethyl-2-alkynyl NECA (5'-N-ethylcarboxamidoadenosine) analogs were synthesized and their binding affinity with the four human adenosine receptors was evaluated. One of the compounds ZR1121 shows high affinity with hA3 receptor and its selectivity over hA1 receptor is 1-2 log orders greater than IB-MECA or Cl-IB-MECA, the currently employed selective A3 agonists.
|
Displacement of [3H]CCPA from human adenosine A1 receptor in CHO cells
|
Homo sapiens
|
222.0
nM
|
|
Journal : J. Med. Chem.
Title : Discovery of a new nucleoside template for human A3 adenosine receptor ligands: D-4'-thioadenosine derivatives without 4'-hydroxymethyl group as highly potent and selective antagonists.
Year : 2007
Volume : 50
Issue : 14
First Page : 3159
Last Page : 3162
Authors : Jeong LS, Choe SA, Gunaga P, Kim HO, Lee HW, Lee SK, Tosh DK, Patel A, Palaniappan KK, Gao ZG, Jacobson KA, Moon HR.
Abstract : Truncated D-4'-thioadenosine derivatives lacking the 4'-hydroxymethylene moiety were synthesized starting from D-mannose, using cyclization to the 4-thiosugar and one-step conversion of the diol to the acetate as key steps. At the human A3 adenosine receptor (AR), N6-substituted purine analogues bound potently and selectively and acted as antagonists in a cyclic AMP functional assay. An N6-(3-chlorobenzyl)purine analogue 9b displayed a Ki value of 1.66 nM at the human A3 AR. Thus, truncated D-4'-thioadenosine is an excellent template for the design of novel A3 AR antagonists to act at both human and murine species.
|
Displacement of [125I]AB-MECA from human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
1.4
nM
|
|
Journal : J. Med. Chem.
Title : Discovery of a new nucleoside template for human A3 adenosine receptor ligands: D-4'-thioadenosine derivatives without 4'-hydroxymethyl group as highly potent and selective antagonists.
Year : 2007
Volume : 50
Issue : 14
First Page : 3159
Last Page : 3162
Authors : Jeong LS, Choe SA, Gunaga P, Kim HO, Lee HW, Lee SK, Tosh DK, Patel A, Palaniappan KK, Gao ZG, Jacobson KA, Moon HR.
Abstract : Truncated D-4'-thioadenosine derivatives lacking the 4'-hydroxymethylene moiety were synthesized starting from D-mannose, using cyclization to the 4-thiosugar and one-step conversion of the diol to the acetate as key steps. At the human A3 adenosine receptor (AR), N6-substituted purine analogues bound potently and selectively and acted as antagonists in a cyclic AMP functional assay. An N6-(3-chlorobenzyl)purine analogue 9b displayed a Ki value of 1.66 nM at the human A3 AR. Thus, truncated D-4'-thioadenosine is an excellent template for the design of novel A3 AR antagonists to act at both human and murine species.
|
Displacement of [3H]DPCPX from human adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
890.0
nM
|
|
Journal : J. Med. Chem.
Title : 5-amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-one: a versatile scaffold to obtain potent and selective A3 adenosine receptor antagonists.
Year : 2007
Volume : 50
Issue : 23
First Page : 5676
Last Page : 5684
Authors : Da Settimo F, Primofiore G, Taliani S, Marini AM, La Motta C, Simorini F, Salerno S, Sergianni V, Tuccinardi T, Martinelli A, Cosimelli B, Greco G, Novellino E, Ciampi O, Trincavelli ML, Martini C.
Abstract : Binding assays on human A1, A2A, and A3 adenosine receptors (ARs) and functional studies on A2B ARs revealed that various 2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1,5(6H)-diones VIII, previously reported as ligands at the central benzodiazepine receptor (BzR), possess nanomolar affinity at the A3 AR. Replacement of the amide of VIII with an amidine moiety gave the 5-amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-ones IX, which maintain a nanomolar potency at the A3 AR with selectivity over the BzR. Insertion of a p-methoxybenzoyl at the 5-amino moiety enhanced A3 AR affinity and selectivity over the A1, A2A, and A2B ARs. The best result of our lead optimization efforts is 9-chloro-5-(4-methoxybenzoyl)amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-one (23), which displayed a Ki of 1.6 nM at the A3 AR and no significant affinity at the other ARs or the BzR. Docking simulations on selected ligands into a model of the A3 AR allowed us to rationalize the structure-activity relationships of phenyltriazolobenzotriazindiones VIII and aminophenyltriazolobenzotriazinones IX at the molecular level.
|
Displacement of [3H]NECA from human adenosine A2A receptor expressed in CHO cells
|
Homo sapiens
|
401.0
nM
|
|
Journal : J. Med. Chem.
Title : 5-amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-one: a versatile scaffold to obtain potent and selective A3 adenosine receptor antagonists.
Year : 2007
Volume : 50
Issue : 23
First Page : 5676
Last Page : 5684
Authors : Da Settimo F, Primofiore G, Taliani S, Marini AM, La Motta C, Simorini F, Salerno S, Sergianni V, Tuccinardi T, Martinelli A, Cosimelli B, Greco G, Novellino E, Ciampi O, Trincavelli ML, Martini C.
Abstract : Binding assays on human A1, A2A, and A3 adenosine receptors (ARs) and functional studies on A2B ARs revealed that various 2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1,5(6H)-diones VIII, previously reported as ligands at the central benzodiazepine receptor (BzR), possess nanomolar affinity at the A3 AR. Replacement of the amide of VIII with an amidine moiety gave the 5-amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-ones IX, which maintain a nanomolar potency at the A3 AR with selectivity over the BzR. Insertion of a p-methoxybenzoyl at the 5-amino moiety enhanced A3 AR affinity and selectivity over the A1, A2A, and A2B ARs. The best result of our lead optimization efforts is 9-chloro-5-(4-methoxybenzoyl)amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-one (23), which displayed a Ki of 1.6 nM at the A3 AR and no significant affinity at the other ARs or the BzR. Docking simulations on selected ligands into a model of the A3 AR allowed us to rationalize the structure-activity relationships of phenyltriazolobenzotriazindiones VIII and aminophenyltriazolobenzotriazinones IX at the molecular level.
|
Displacement of [3H]AB-MECA from human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
0.22
nM
|
|
Journal : J. Med. Chem.
Title : 5-amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-one: a versatile scaffold to obtain potent and selective A3 adenosine receptor antagonists.
Year : 2007
Volume : 50
Issue : 23
First Page : 5676
Last Page : 5684
Authors : Da Settimo F, Primofiore G, Taliani S, Marini AM, La Motta C, Simorini F, Salerno S, Sergianni V, Tuccinardi T, Martinelli A, Cosimelli B, Greco G, Novellino E, Ciampi O, Trincavelli ML, Martini C.
Abstract : Binding assays on human A1, A2A, and A3 adenosine receptors (ARs) and functional studies on A2B ARs revealed that various 2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1,5(6H)-diones VIII, previously reported as ligands at the central benzodiazepine receptor (BzR), possess nanomolar affinity at the A3 AR. Replacement of the amide of VIII with an amidine moiety gave the 5-amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-ones IX, which maintain a nanomolar potency at the A3 AR with selectivity over the BzR. Insertion of a p-methoxybenzoyl at the 5-amino moiety enhanced A3 AR affinity and selectivity over the A1, A2A, and A2B ARs. The best result of our lead optimization efforts is 9-chloro-5-(4-methoxybenzoyl)amino-2-phenyl[1,2,3]triazolo[1,2-a][1,2,4]benzotriazin-1-one (23), which displayed a Ki of 1.6 nM at the A3 AR and no significant affinity at the other ARs or the BzR. Docking simulations on selected ligands into a model of the A3 AR allowed us to rationalize the structure-activity relationships of phenyltriazolobenzotriazindiones VIII and aminophenyltriazolobenzotriazinones IX at the molecular level.
|
Displacement of [3H]CCPA from human adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
222.0
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Structure-activity relationships of 2-chloro-N6-substituted-4'-thioadenosine-5'-N,N-dialkyluronamides as human A3 adenosine receptor antagonists.
Year : 2008
Volume : 18
Issue : 5
First Page : 1612
Last Page : 1616
Authors : Jeong LS, Lee HW, Kim HO, Tosh DK, Pal S, Choi WJ, Gao ZG, Patel AR, Williams W, Jacobson KA, Kim HD.
Abstract : On the basis of potent and selective A(3) adenosine receptor (AR) antagonist, 2-chloro-N(6)-(3-iodobenzyl)-4'-thioadenosine-5'-N,N-dimethyluronamide, structure-activity relationships were studied for a series of 5'-N,N-dialkyluronamide derivatives, synthesized from D-gulonic gamma-lactone. From this study, it was revealed that removal of the hydrogen bond-donating ability of the 5'-uronamide was essential for the pure A(3)AR antagonism. 5'-N,N-Dimethyluronamide derivatives exhibited higher binding affinity than larger 5'-N,N-dialkyl or 5'-N,N-cycloalkylamide derivatives, indicating that steric factors are crucial in binding to the human A(3)AR. A N(6)-(3-bromobenzyl) derivative 6c (K(i)=9.32 nM) exhibited the highest binding affinity at the human A(3)AR with very low binding affinities to other AR subtypes.
|
Displacement of [3H]ABMECA from human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
1.4
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Structure-activity relationships of 2-chloro-N6-substituted-4'-thioadenosine-5'-N,N-dialkyluronamides as human A3 adenosine receptor antagonists.
Year : 2008
Volume : 18
Issue : 5
First Page : 1612
Last Page : 1616
Authors : Jeong LS, Lee HW, Kim HO, Tosh DK, Pal S, Choi WJ, Gao ZG, Patel AR, Williams W, Jacobson KA, Kim HD.
Abstract : On the basis of potent and selective A(3) adenosine receptor (AR) antagonist, 2-chloro-N(6)-(3-iodobenzyl)-4'-thioadenosine-5'-N,N-dimethyluronamide, structure-activity relationships were studied for a series of 5'-N,N-dialkyluronamide derivatives, synthesized from D-gulonic gamma-lactone. From this study, it was revealed that removal of the hydrogen bond-donating ability of the 5'-uronamide was essential for the pure A(3)AR antagonism. 5'-N,N-Dimethyluronamide derivatives exhibited higher binding affinity than larger 5'-N,N-dialkyl or 5'-N,N-cycloalkylamide derivatives, indicating that steric factors are crucial in binding to the human A(3)AR. A N(6)-(3-bromobenzyl) derivative 6c (K(i)=9.32 nM) exhibited the highest binding affinity at the human A(3)AR with very low binding affinities to other AR subtypes.
|
Agonist activity at human adenosine A3 receptor expressed in CHO cells assessed as inhibition of forskolin-stimulated cAMP
|
Homo sapiens
|
1.2
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Structure-activity relationships of 2-chloro-N6-substituted-4'-thioadenosine-5'-N,N-dialkyluronamides as human A3 adenosine receptor antagonists.
Year : 2008
Volume : 18
Issue : 5
First Page : 1612
Last Page : 1616
Authors : Jeong LS, Lee HW, Kim HO, Tosh DK, Pal S, Choi WJ, Gao ZG, Patel AR, Williams W, Jacobson KA, Kim HD.
Abstract : On the basis of potent and selective A(3) adenosine receptor (AR) antagonist, 2-chloro-N(6)-(3-iodobenzyl)-4'-thioadenosine-5'-N,N-dimethyluronamide, structure-activity relationships were studied for a series of 5'-N,N-dialkyluronamide derivatives, synthesized from D-gulonic gamma-lactone. From this study, it was revealed that removal of the hydrogen bond-donating ability of the 5'-uronamide was essential for the pure A(3)AR antagonism. 5'-N,N-Dimethyluronamide derivatives exhibited higher binding affinity than larger 5'-N,N-dialkyl or 5'-N,N-cycloalkylamide derivatives, indicating that steric factors are crucial in binding to the human A(3)AR. A N(6)-(3-bromobenzyl) derivative 6c (K(i)=9.32 nM) exhibited the highest binding affinity at the human A(3)AR with very low binding affinities to other AR subtypes.
|
Displacement of [3H]DPDPX from human adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
890.0
nM
|
|
Journal : J. Med. Chem.
Title : Derivatives of 4-amino-6-hydroxy-2-mercaptopyrimidine as novel, potent, and selective A3 adenosine receptor antagonists.
Year : 2008
Volume : 51
Issue : 6
First Page : 1764
Last Page : 1770
Authors : Cosimelli B, Greco G, Ehlardo M, Novellino E, Da Settimo F, Taliani S, La Motta C, Bellandi M, Tuccinardi T, Martinelli A, Ciampi O, Trincavelli ML, Martini C.
Abstract : A number of derivatives of 4-amino-6-hydroxy-2-mercaptopyrimidine ( 5) were synthesized and biologically evaluated as A 3 adenosine receptor (A 3 AR) antagonists. The new compounds were designed as open chain analogues of a triazolopyrimidinone derivative displaying submicromolar affinity for the A 3 AR, which had been previously identified using a 3D database search. Substituents R, R', and R'' attached to the parent compound 5 were chosen according to factorial design and stepwise lead optimization approaches, taking into account the essentially hydrophobic nature of the A 3 AR binding site. As a result, 5m (R = n-C 3H 7, R' = 4-ClC 6H 4CH 2, R'' = CH 3) was identified among the pyrimidine derivatives as the ligand featuring the best combination of potency and selectivity for the target receptor. This compound binds to the A 3 AR with a K i of 3.5 nM and is devoid of appreciable affinity for the A 1, A 2A, and A 2B ARs.
|
Displacement of [3H]NECA from human adenosine A2A receptor expressed in CHO cells
|
Homo sapiens
|
401.0
nM
|
|
Journal : J. Med. Chem.
Title : Derivatives of 4-amino-6-hydroxy-2-mercaptopyrimidine as novel, potent, and selective A3 adenosine receptor antagonists.
Year : 2008
Volume : 51
Issue : 6
First Page : 1764
Last Page : 1770
Authors : Cosimelli B, Greco G, Ehlardo M, Novellino E, Da Settimo F, Taliani S, La Motta C, Bellandi M, Tuccinardi T, Martinelli A, Ciampi O, Trincavelli ML, Martini C.
Abstract : A number of derivatives of 4-amino-6-hydroxy-2-mercaptopyrimidine ( 5) were synthesized and biologically evaluated as A 3 adenosine receptor (A 3 AR) antagonists. The new compounds were designed as open chain analogues of a triazolopyrimidinone derivative displaying submicromolar affinity for the A 3 AR, which had been previously identified using a 3D database search. Substituents R, R', and R'' attached to the parent compound 5 were chosen according to factorial design and stepwise lead optimization approaches, taking into account the essentially hydrophobic nature of the A 3 AR binding site. As a result, 5m (R = n-C 3H 7, R' = 4-ClC 6H 4CH 2, R'' = CH 3) was identified among the pyrimidine derivatives as the ligand featuring the best combination of potency and selectivity for the target receptor. This compound binds to the A 3 AR with a K i of 3.5 nM and is devoid of appreciable affinity for the A 1, A 2A, and A 2B ARs.
|
Displacement of [125I]AB-MECA from human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
0.22
nM
|
|
Journal : J. Med. Chem.
Title : Derivatives of 4-amino-6-hydroxy-2-mercaptopyrimidine as novel, potent, and selective A3 adenosine receptor antagonists.
Year : 2008
Volume : 51
Issue : 6
First Page : 1764
Last Page : 1770
Authors : Cosimelli B, Greco G, Ehlardo M, Novellino E, Da Settimo F, Taliani S, La Motta C, Bellandi M, Tuccinardi T, Martinelli A, Ciampi O, Trincavelli ML, Martini C.
Abstract : A number of derivatives of 4-amino-6-hydroxy-2-mercaptopyrimidine ( 5) were synthesized and biologically evaluated as A 3 adenosine receptor (A 3 AR) antagonists. The new compounds were designed as open chain analogues of a triazolopyrimidinone derivative displaying submicromolar affinity for the A 3 AR, which had been previously identified using a 3D database search. Substituents R, R', and R'' attached to the parent compound 5 were chosen according to factorial design and stepwise lead optimization approaches, taking into account the essentially hydrophobic nature of the A 3 AR binding site. As a result, 5m (R = n-C 3H 7, R' = 4-ClC 6H 4CH 2, R'' = CH 3) was identified among the pyrimidine derivatives as the ligand featuring the best combination of potency and selectivity for the target receptor. This compound binds to the A 3 AR with a K i of 3.5 nM and is devoid of appreciable affinity for the A 1, A 2A, and A 2B ARs.
|
Displacement of [125I]N6-(4-amino-3-iodobenzyl)adenosine-5'-N-methyl-uronamide from mouse recombinant adenosine A1 receptor expressed in HEK293 cells
|
Mus musculus
|
35.0
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design of (N)-methanocarba adenosine 5'-uronamides as species-independent A3 receptor-selective agonists.
Year : 2008
Volume : 18
Issue : 9
First Page : 2813
Last Page : 2819
Authors : Melman A, Gao ZG, Kumar D, Wan TC, Gizewski E, Auchampach JA, Jacobson KA.
Abstract : 2-Chloro-5'-N-methylcarboxamidoadenosine analogues containing the (N)-methanocarba (bicyclo[3.1.0]hexane) ring system as a ribose substitute display increased selectivity as agonists of the human A(3) adenosine receptor (AR). However, the selectivity in mouse was greatly reduced due to an increased tolerance of this ring system at the mouse A(1)AR. Therefore, we varied substituents at the N(6) and C2 positions in search of compounds that have improved A(3)AR selectivity and are species independent. An N(6)-methyl analogue was balanced in affinity at mouse A(1)/A(3)ARs, with high selectivity in comparison to the A(2A)AR. Substitution of the 2-chloro atom with larger and more hydrophobic substituents, such as iodo and alkynyl groups, tended to increase the A(3)AR selectivity (up to 430-fold) in mouse and preserve it in human. Extended and chemically functionalized alkynyl chains attached at the C2 position of the purine moiety preserved A(3)AR selectivity more effectively than similar chains attached at the 3-position of the N(6)-benzyl group.
|
Displacement of [125I]N6-(-amino-3-iodobenzyl)adenosine-5'-N-methyl-uronamide from mouse recombinant adenosine A3 receptor expressed in HEK293 cells
|
Mus musculus
|
0.18
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design of (N)-methanocarba adenosine 5'-uronamides as species-independent A3 receptor-selective agonists.
Year : 2008
Volume : 18
Issue : 9
First Page : 2813
Last Page : 2819
Authors : Melman A, Gao ZG, Kumar D, Wan TC, Gizewski E, Auchampach JA, Jacobson KA.
Abstract : 2-Chloro-5'-N-methylcarboxamidoadenosine analogues containing the (N)-methanocarba (bicyclo[3.1.0]hexane) ring system as a ribose substitute display increased selectivity as agonists of the human A(3) adenosine receptor (AR). However, the selectivity in mouse was greatly reduced due to an increased tolerance of this ring system at the mouse A(1)AR. Therefore, we varied substituents at the N(6) and C2 positions in search of compounds that have improved A(3)AR selectivity and are species independent. An N(6)-methyl analogue was balanced in affinity at mouse A(1)/A(3)ARs, with high selectivity in comparison to the A(2A)AR. Substitution of the 2-chloro atom with larger and more hydrophobic substituents, such as iodo and alkynyl groups, tended to increase the A(3)AR selectivity (up to 430-fold) in mouse and preserve it in human. Extended and chemically functionalized alkynyl chains attached at the C2 position of the purine moiety preserved A(3)AR selectivity more effectively than similar chains attached at the 3-position of the N(6)-benzyl group.
|
Displacement of radioligand from human adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
220.0
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design of (N)-methanocarba adenosine 5'-uronamides as species-independent A3 receptor-selective agonists.
Year : 2008
Volume : 18
Issue : 9
First Page : 2813
Last Page : 2819
Authors : Melman A, Gao ZG, Kumar D, Wan TC, Gizewski E, Auchampach JA, Jacobson KA.
Abstract : 2-Chloro-5'-N-methylcarboxamidoadenosine analogues containing the (N)-methanocarba (bicyclo[3.1.0]hexane) ring system as a ribose substitute display increased selectivity as agonists of the human A(3) adenosine receptor (AR). However, the selectivity in mouse was greatly reduced due to an increased tolerance of this ring system at the mouse A(1)AR. Therefore, we varied substituents at the N(6) and C2 positions in search of compounds that have improved A(3)AR selectivity and are species independent. An N(6)-methyl analogue was balanced in affinity at mouse A(1)/A(3)ARs, with high selectivity in comparison to the A(2A)AR. Substitution of the 2-chloro atom with larger and more hydrophobic substituents, such as iodo and alkynyl groups, tended to increase the A(3)AR selectivity (up to 430-fold) in mouse and preserve it in human. Extended and chemically functionalized alkynyl chains attached at the C2 position of the purine moiety preserved A(3)AR selectivity more effectively than similar chains attached at the 3-position of the N(6)-benzyl group.
|
Displacement of radioligand from human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
1.4
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design of (N)-methanocarba adenosine 5'-uronamides as species-independent A3 receptor-selective agonists.
Year : 2008
Volume : 18
Issue : 9
First Page : 2813
Last Page : 2819
Authors : Melman A, Gao ZG, Kumar D, Wan TC, Gizewski E, Auchampach JA, Jacobson KA.
Abstract : 2-Chloro-5'-N-methylcarboxamidoadenosine analogues containing the (N)-methanocarba (bicyclo[3.1.0]hexane) ring system as a ribose substitute display increased selectivity as agonists of the human A(3) adenosine receptor (AR). However, the selectivity in mouse was greatly reduced due to an increased tolerance of this ring system at the mouse A(1)AR. Therefore, we varied substituents at the N(6) and C2 positions in search of compounds that have improved A(3)AR selectivity and are species independent. An N(6)-methyl analogue was balanced in affinity at mouse A(1)/A(3)ARs, with high selectivity in comparison to the A(2A)AR. Substitution of the 2-chloro atom with larger and more hydrophobic substituents, such as iodo and alkynyl groups, tended to increase the A(3)AR selectivity (up to 430-fold) in mouse and preserve it in human. Extended and chemically functionalized alkynyl chains attached at the C2 position of the purine moiety preserved A(3)AR selectivity more effectively than similar chains attached at the 3-position of the N(6)-benzyl group.
|
Displacement of radioligand from rat adenosine A1 receptor
|
Rattus norvegicus
|
820.0
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design of (N)-methanocarba adenosine 5'-uronamides as species-independent A3 receptor-selective agonists.
Year : 2008
Volume : 18
Issue : 9
First Page : 2813
Last Page : 2819
Authors : Melman A, Gao ZG, Kumar D, Wan TC, Gizewski E, Auchampach JA, Jacobson KA.
Abstract : 2-Chloro-5'-N-methylcarboxamidoadenosine analogues containing the (N)-methanocarba (bicyclo[3.1.0]hexane) ring system as a ribose substitute display increased selectivity as agonists of the human A(3) adenosine receptor (AR). However, the selectivity in mouse was greatly reduced due to an increased tolerance of this ring system at the mouse A(1)AR. Therefore, we varied substituents at the N(6) and C2 positions in search of compounds that have improved A(3)AR selectivity and are species independent. An N(6)-methyl analogue was balanced in affinity at mouse A(1)/A(3)ARs, with high selectivity in comparison to the A(2A)AR. Substitution of the 2-chloro atom with larger and more hydrophobic substituents, such as iodo and alkynyl groups, tended to increase the A(3)AR selectivity (up to 430-fold) in mouse and preserve it in human. Extended and chemically functionalized alkynyl chains attached at the C2 position of the purine moiety preserved A(3)AR selectivity more effectively than similar chains attached at the 3-position of the N(6)-benzyl group.
|
Displacement of radioligand from rat adenosine A2A receptor
|
Rattus norvegicus
|
470.0
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design of (N)-methanocarba adenosine 5'-uronamides as species-independent A3 receptor-selective agonists.
Year : 2008
Volume : 18
Issue : 9
First Page : 2813
Last Page : 2819
Authors : Melman A, Gao ZG, Kumar D, Wan TC, Gizewski E, Auchampach JA, Jacobson KA.
Abstract : 2-Chloro-5'-N-methylcarboxamidoadenosine analogues containing the (N)-methanocarba (bicyclo[3.1.0]hexane) ring system as a ribose substitute display increased selectivity as agonists of the human A(3) adenosine receptor (AR). However, the selectivity in mouse was greatly reduced due to an increased tolerance of this ring system at the mouse A(1)AR. Therefore, we varied substituents at the N(6) and C2 positions in search of compounds that have improved A(3)AR selectivity and are species independent. An N(6)-methyl analogue was balanced in affinity at mouse A(1)/A(3)ARs, with high selectivity in comparison to the A(2A)AR. Substitution of the 2-chloro atom with larger and more hydrophobic substituents, such as iodo and alkynyl groups, tended to increase the A(3)AR selectivity (up to 430-fold) in mouse and preserve it in human. Extended and chemically functionalized alkynyl chains attached at the C2 position of the purine moiety preserved A(3)AR selectivity more effectively than similar chains attached at the 3-position of the N(6)-benzyl group.
|
Displacement of radioligand from rat A3 adenosine receptor
|
Rattus norvegicus
|
0.33
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Design of (N)-methanocarba adenosine 5'-uronamides as species-independent A3 receptor-selective agonists.
Year : 2008
Volume : 18
Issue : 9
First Page : 2813
Last Page : 2819
Authors : Melman A, Gao ZG, Kumar D, Wan TC, Gizewski E, Auchampach JA, Jacobson KA.
Abstract : 2-Chloro-5'-N-methylcarboxamidoadenosine analogues containing the (N)-methanocarba (bicyclo[3.1.0]hexane) ring system as a ribose substitute display increased selectivity as agonists of the human A(3) adenosine receptor (AR). However, the selectivity in mouse was greatly reduced due to an increased tolerance of this ring system at the mouse A(1)AR. Therefore, we varied substituents at the N(6) and C2 positions in search of compounds that have improved A(3)AR selectivity and are species independent. An N(6)-methyl analogue was balanced in affinity at mouse A(1)/A(3)ARs, with high selectivity in comparison to the A(2A)AR. Substitution of the 2-chloro atom with larger and more hydrophobic substituents, such as iodo and alkynyl groups, tended to increase the A(3)AR selectivity (up to 430-fold) in mouse and preserve it in human. Extended and chemically functionalized alkynyl chains attached at the C2 position of the purine moiety preserved A(3)AR selectivity more effectively than similar chains attached at the 3-position of the N(6)-benzyl group.
|
Displacement of [125I]I-AB-MEAC from human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
0.3802
nM
|
|
Journal : Eur. J. Med. Chem.
Title : Topological descriptors in modeling the agonistic activity of human A3 adenosine receptor ligands: the derivatives of 2-chloro-N(6)-substituted-4'-thioadenosine-5'-uronamide.
Year : 2009
Volume : 44
Issue : 4
First Page : 1377
Last Page : 1382
Authors : Sharma S, Sharma BK, Sharma SK, Singh P, Prabhakar YS.
Abstract : The human A(3) adenosine receptor agonistic activity of 2-chloro-N(6)-substituted-4'-thioadenosine-5'-uronamides has been analyzed through Combinatorial Protocol in Multiple Linear Regression (CP-MLR) using 488 topological descriptors obtained from DRAGON software for the energy minimized 3D-structures of these molecules. Among the various descriptor classes considered in the study, the human A(3) adenosine receptor agonistic activity is correlated with simple topological descriptors (TOPO), Modified Burden eigenvalues (BCUT) and functional group (FUNC) classes of descriptors. The average valence connectivity index of order zero, X0Av, the sum of topological distances between O and Cl, T (O...Cl) from the TOPO class, the lowest eigenvalue n.2 of Burden matrix/weighted by atomic masses, BELm2, from the BCUT class and the number of secondary aliphatic amides, nCONHR, from FUNC class have contributed significantly in the development of a statistical sound models. The models developed and the participating descriptors suggest that the substituent groups at N(6)-position and/or 5'-uronamide of 2-chloro-N(6)-substituted-4'-thioadenosine-5'-uronamide derivatives hold scope for structural modification in the optimization of activity.
|
Displacement of [3H]CCPA form human adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
222.0
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Selective A(3) adenosine receptor antagonists derived from nucleosides containing a bicyclo[3.1.0]hexane ring system.
Year : 2008
Volume : 16
Issue : 18
First Page : 8546
Last Page : 8556
Authors : Melman A, Wang B, Joshi BV, Gao ZG, Castro Sd, Heller CL, Kim SK, Jeong LS, Jacobson KA.
Abstract : We have prepared 50-modified derivatives of adenosine and a corresponding (N)-methanocarba nucleoside series containing a bicyclo[3.1.0]hexane ring system in place of the ribose moiety. The compounds were examined in binding assays at three subtypes of adenosine receptors (ARs) and in functional assays at the A3 AR. The H-bonding ability of a group of 9-riboside derivatives containing a 50-uronamide moiety was reduced by modification of the NH; however these derivatives did not display the desired activity as selective A3 AR antagonists, as occurs with 50-N,N-dimethyluronamides. However, truncated (N)-methanocarba analogues lacking a 40-hydroxymethyl group were highly potent and selective antagonists of the human A3 AR. The compounds were synthesized from D-ribose using a reductive free radical decarboxylation of a 50-carboxy intermediate. A less efficient synthetic approach began with L-ribose, which was similar to the published synthesis of (N)-methanocarba A3AR agonists. Compounds 33b-39b (N6-3-halobenzyl and related arylalkyl derivatives) were potent A3AR antagonists with binding Ki values of 0.7-1.4 nM. In a functional assay of [35S]GTPcS binding, 33b (3-iodobenzyl) completely inhibited stimulation by NECA with a KB of 8.9 nM. Thus, a highly potent and selective series of A3AR antagonists has been described.
|
Displacement of [3H]CGS21680 form human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
1.4
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Selective A(3) adenosine receptor antagonists derived from nucleosides containing a bicyclo[3.1.0]hexane ring system.
Year : 2008
Volume : 16
Issue : 18
First Page : 8546
Last Page : 8556
Authors : Melman A, Wang B, Joshi BV, Gao ZG, Castro Sd, Heller CL, Kim SK, Jeong LS, Jacobson KA.
Abstract : We have prepared 50-modified derivatives of adenosine and a corresponding (N)-methanocarba nucleoside series containing a bicyclo[3.1.0]hexane ring system in place of the ribose moiety. The compounds were examined in binding assays at three subtypes of adenosine receptors (ARs) and in functional assays at the A3 AR. The H-bonding ability of a group of 9-riboside derivatives containing a 50-uronamide moiety was reduced by modification of the NH; however these derivatives did not display the desired activity as selective A3 AR antagonists, as occurs with 50-N,N-dimethyluronamides. However, truncated (N)-methanocarba analogues lacking a 40-hydroxymethyl group were highly potent and selective antagonists of the human A3 AR. The compounds were synthesized from D-ribose using a reductive free radical decarboxylation of a 50-carboxy intermediate. A less efficient synthetic approach began with L-ribose, which was similar to the published synthesis of (N)-methanocarba A3AR agonists. Compounds 33b-39b (N6-3-halobenzyl and related arylalkyl derivatives) were potent A3AR antagonists with binding Ki values of 0.7-1.4 nM. In a functional assay of [35S]GTPcS binding, 33b (3-iodobenzyl) completely inhibited stimulation by NECA with a KB of 8.9 nM. Thus, a highly potent and selective series of A3AR antagonists has been described.
|
Displacement of [3H]CCPA from human adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
222.0
nM
|
|
Journal : J. Med. Chem.
Title : Structure-activity relationships of truncated D- and l-4'-thioadenosine derivatives as species-independent A3 adenosine receptor antagonists.
Year : 2008
Volume : 51
Issue : 20
First Page : 6609
Last Page : 6613
Authors : Jeong LS, Pal S, Choe SA, Choi WJ, Jacobson KA, Gao ZG, Klutz AM, Hou X, Kim HO, Lee HW, Lee SK, Tosh DK, Moon HR.
Abstract : Novel D- and l-4'-thioadenosine derivatives lacking the 4'-hydroxymethyl moiety were synthesized, starting from d-mannose and d-gulonic gamma-lactone, respectively, as potent and selective species-independent A 3 adenosine receptor (AR) antagonists. Among the novel 4'-truncated 2-H nucleosides tested, a N(6)-(3-chlorobenzyl) derivative 7c was the most potent at the human A 3 AR (K i = 1.5 nM), but a N(6)-(3-bromobenzyl) derivative 7d showed the optimal species-independent binding affinity.
|
Displacement of [125I]I-AB-MECA from human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
1.4
nM
|
|
Journal : J. Med. Chem.
Title : Structure-activity relationships of truncated D- and l-4'-thioadenosine derivatives as species-independent A3 adenosine receptor antagonists.
Year : 2008
Volume : 51
Issue : 20
First Page : 6609
Last Page : 6613
Authors : Jeong LS, Pal S, Choe SA, Choi WJ, Jacobson KA, Gao ZG, Klutz AM, Hou X, Kim HO, Lee HW, Lee SK, Tosh DK, Moon HR.
Abstract : Novel D- and l-4'-thioadenosine derivatives lacking the 4'-hydroxymethyl moiety were synthesized, starting from d-mannose and d-gulonic gamma-lactone, respectively, as potent and selective species-independent A 3 adenosine receptor (AR) antagonists. Among the novel 4'-truncated 2-H nucleosides tested, a N(6)-(3-chlorobenzyl) derivative 7c was the most potent at the human A 3 AR (K i = 1.5 nM), but a N(6)-(3-bromobenzyl) derivative 7d showed the optimal species-independent binding affinity.
|
Displacement of [125I]I-AB-MECA from rat adenosine A3 receptor expressed in CHO cells
|
Rattus norvegicus
|
0.33
nM
|
|
Journal : J. Med. Chem.
Title : Structure-activity relationships of truncated D- and l-4'-thioadenosine derivatives as species-independent A3 adenosine receptor antagonists.
Year : 2008
Volume : 51
Issue : 20
First Page : 6609
Last Page : 6613
Authors : Jeong LS, Pal S, Choe SA, Choi WJ, Jacobson KA, Gao ZG, Klutz AM, Hou X, Kim HO, Lee HW, Lee SK, Tosh DK, Moon HR.
Abstract : Novel D- and l-4'-thioadenosine derivatives lacking the 4'-hydroxymethyl moiety were synthesized, starting from d-mannose and d-gulonic gamma-lactone, respectively, as potent and selective species-independent A 3 adenosine receptor (AR) antagonists. Among the novel 4'-truncated 2-H nucleosides tested, a N(6)-(3-chlorobenzyl) derivative 7c was the most potent at the human A 3 AR (K i = 1.5 nM), but a N(6)-(3-bromobenzyl) derivative 7d showed the optimal species-independent binding affinity.
|
Displacement of [3H]NECA from human recombinant adenosine A1 receptor expressed in CHO cells by liquid scintillation counting
|
Homo sapiens
|
220.0
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Structure-activity relationships of truncated adenosine derivatives as highly potent and selective human A3 adenosine receptor antagonists.
Year : 2009
Volume : 17
Issue : 10
First Page : 3733
Last Page : 3738
Authors : Pal S, Choi WJ, Choe SA, Heller CL, Gao ZG, Chinn M, Jacobson KA, Hou X, Lee SK, Kim HO, Jeong LS.
Abstract : On the basis of potent and selective binding affinity of truncated 4'-thioadenosine derivatives at the human A(3) adenosine receptor (AR), their bioisosteric 4'-oxo derivatives were designed and synthesized from commercially available 2,3-O-isopropylidene-D-erythrono lactone. The derivatives tested in AR binding assays were substituted at the C2 and N(6) positions. All synthesized nucleosides exhibited potent and selective binding affinity at the human A(3) AR. They were less potent than the corresponding 4'-thio analogues, but showed still selective to other subtypes. The 2-Cl series generally were better than the 2-H series in view of binding affinity and selectivity. Among compounds tested, compound 5d (X=Cl, R=3-bromobenzyl) showed the highest binding affinity (K(i)=13.0+/-6.9 nM) at the hA(3) AR with high selectivity (at least 88-fold) in comparison to other AR subtypes. Like the corresponding truncated 4'-thio series, compound 5d antagonized the action of an agonist to inhibit forskolin-stimulated adenylate cyclase in hA(3) AR-expressing CHO cells. Although the 4'-oxo series were less potent than the 4'-thio series, this class of human A(3) AR antagonists is also regarded as another good template for the design of A(3) AR antagonists and for further drug development.
|
Displacement of [3H]I-AB-MECA from human recombinant adenosine A3 receptor expressed in CHO cells by liquid scintillation counting
|
Homo sapiens
|
1.4
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Structure-activity relationships of truncated adenosine derivatives as highly potent and selective human A3 adenosine receptor antagonists.
Year : 2009
Volume : 17
Issue : 10
First Page : 3733
Last Page : 3738
Authors : Pal S, Choi WJ, Choe SA, Heller CL, Gao ZG, Chinn M, Jacobson KA, Hou X, Lee SK, Kim HO, Jeong LS.
Abstract : On the basis of potent and selective binding affinity of truncated 4'-thioadenosine derivatives at the human A(3) adenosine receptor (AR), their bioisosteric 4'-oxo derivatives were designed and synthesized from commercially available 2,3-O-isopropylidene-D-erythrono lactone. The derivatives tested in AR binding assays were substituted at the C2 and N(6) positions. All synthesized nucleosides exhibited potent and selective binding affinity at the human A(3) AR. They were less potent than the corresponding 4'-thio analogues, but showed still selective to other subtypes. The 2-Cl series generally were better than the 2-H series in view of binding affinity and selectivity. Among compounds tested, compound 5d (X=Cl, R=3-bromobenzyl) showed the highest binding affinity (K(i)=13.0+/-6.9 nM) at the hA(3) AR with high selectivity (at least 88-fold) in comparison to other AR subtypes. Like the corresponding truncated 4'-thio series, compound 5d antagonized the action of an agonist to inhibit forskolin-stimulated adenylate cyclase in hA(3) AR-expressing CHO cells. Although the 4'-oxo series were less potent than the 4'-thio series, this class of human A(3) AR antagonists is also regarded as another good template for the design of A(3) AR antagonists and for further drug development.
|
Binding affinity to human adenosine A3 receptor
|
Homo sapiens
|
1.0
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Design and synthesis of N(6)-substituted-4'-thioadenosine-5'-uronamides as potent and selective human A(3) adenosine receptor agonists.
Year : 2009
Volume : 17
Issue : 23
First Page : 8003
Last Page : 8011
Authors : Choi WJ, Lee HW, Kim HO, Chinn M, Gao ZG, Patel A, Jacobson KA, Moon HR, Jung YH, Jeong LS.
Abstract : On the basis of a bioisosteric rationale, 4'-thionucleoside analogues of IB-MECA (N(6)-(3-Iodo-benzyl)-9-(5'-methylaminocarbonyl-beta-d-ribofuranosyl)adenine), which is a potent and selective A(3) adenosine receptor (AR) agonist, were synthesized from d-gulonic acid gamma-lactone. The 4'-thio analogue (5h) of IB-MECA showed extremely high binding affinity (K(i)=0.25 nM) at the human A(3)AR and was more potent than IB-MECA (K(i)=1.4 nM). Bulky substituents at the 5'-uronamide position, such as cyclohexyl and 2-methylbenzyl, in this series of 2-H nucleoside derivatives were tolerated in A(3)AR binding, although small alkyl analogues were more potent.
|
Displacement of [3H]R-PIA from human adenosine A1 receptor expressed in CHO cells
|
Homo sapiens
|
222.0
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Design and synthesis of N(6)-substituted-4'-thioadenosine-5'-uronamides as potent and selective human A(3) adenosine receptor agonists.
Year : 2009
Volume : 17
Issue : 23
First Page : 8003
Last Page : 8011
Authors : Choi WJ, Lee HW, Kim HO, Chinn M, Gao ZG, Patel A, Jacobson KA, Moon HR, Jung YH, Jeong LS.
Abstract : On the basis of a bioisosteric rationale, 4'-thionucleoside analogues of IB-MECA (N(6)-(3-Iodo-benzyl)-9-(5'-methylaminocarbonyl-beta-d-ribofuranosyl)adenine), which is a potent and selective A(3) adenosine receptor (AR) agonist, were synthesized from d-gulonic acid gamma-lactone. The 4'-thio analogue (5h) of IB-MECA showed extremely high binding affinity (K(i)=0.25 nM) at the human A(3)AR and was more potent than IB-MECA (K(i)=1.4 nM). Bulky substituents at the 5'-uronamide position, such as cyclohexyl and 2-methylbenzyl, in this series of 2-H nucleoside derivatives were tolerated in A(3)AR binding, although small alkyl analogues were more potent.
|
Displacement of [125I]AB-MECA from human adenosine A3 receptor expressed in CHO cells
|
Homo sapiens
|
1.4
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Design and synthesis of N(6)-substituted-4'-thioadenosine-5'-uronamides as potent and selective human A(3) adenosine receptor agonists.
Year : 2009
Volume : 17
Issue : 23
First Page : 8003
Last Page : 8011
Authors : Choi WJ, Lee HW, Kim HO, Chinn M, Gao ZG, Patel A, Jacobson KA, Moon HR, Jung YH, Jeong LS.
Abstract : On the basis of a bioisosteric rationale, 4'-thionucleoside analogues of IB-MECA (N(6)-(3-Iodo-benzyl)-9-(5'-methylaminocarbonyl-beta-d-ribofuranosyl)adenine), which is a potent and selective A(3) adenosine receptor (AR) agonist, were synthesized from d-gulonic acid gamma-lactone. The 4'-thio analogue (5h) of IB-MECA showed extremely high binding affinity (K(i)=0.25 nM) at the human A(3)AR and was more potent than IB-MECA (K(i)=1.4 nM). Bulky substituents at the 5'-uronamide position, such as cyclohexyl and 2-methylbenzyl, in this series of 2-H nucleoside derivatives were tolerated in A(3)AR binding, although small alkyl analogues were more potent.
|
Displacement of [3H]DPCPX from human A1 adenosine receptor expressed in CHO cell membrane
|
Homo sapiens
|
890.0
nM
|
|
Journal : J. Med. Chem.
Title : 3-aryl-[1,2,4]triazino[4,3-a]benzimidazol-4(10H)-one: a novel template for the design of highly selective A₂B adenosine receptor antagonists.
Year : 2012
Volume : 55
Issue : 4
First Page : 1490
Last Page : 1499
Authors : Taliani S, Pugliesi I, Barresi E, Simorini F, Salerno S, La Motta C, Marini AM, Cosimelli B, Cosconati S, Di Maro S, Marinelli L, Daniele S, Trincavelli ML, Greco G, Novellino E, Martini C, Da Settimo F.
Abstract : In an effort to identify novel ligands possessing high affinity and selectivity for the A(2B) AR subtype, we further investigated the class of 3-aryl[1,2,4]triazino[4,3-a]benzimidazol-4(10H)-ones V, previously disclosed by us as selective A(1) AR antagonists. Preliminary assays on a number of triazinobenzimidazoles derived from our "in-house" collection revealed that all the derivatives selected showed significant affinity at A(2B) AR, no affinity at A(3) AR, and various degrees of selectivity toward A(1) and A(2A) ARs. Investigation of a new series featuring modified substituents at the 10-position (4'-chlorophenyl or phenylethyl groups), and a chlorine atom at the 7-position (X) of the triazinobenzimidazole nucleus, yielded highly potent and selective A(2B) AR antagonists. The presence of a pendant 3-phenyl ring appears to hamper the interaction with A(2A) AR, conferring high A(2B)/A(2A) AR selectivity. Derivative 13 (X = Cl, R = C(6)H(5)) is the most potent and selective compound, with an IC(50) of 3.10 nM at A(2B) AR and no affinity at A(1), A(2A), and A(3) ARs.
|
Displacement of [3H]NECA from human A2A adenosine receptor expressed in CHO cell membrane
|
Homo sapiens
|
401.0
nM
|
|
Journal : J. Med. Chem.
Title : 3-aryl-[1,2,4]triazino[4,3-a]benzimidazol-4(10H)-one: a novel template for the design of highly selective A₂B adenosine receptor antagonists.
Year : 2012
Volume : 55
Issue : 4
First Page : 1490
Last Page : 1499
Authors : Taliani S, Pugliesi I, Barresi E, Simorini F, Salerno S, La Motta C, Marini AM, Cosimelli B, Cosconati S, Di Maro S, Marinelli L, Daniele S, Trincavelli ML, Greco G, Novellino E, Martini C, Da Settimo F.
Abstract : In an effort to identify novel ligands possessing high affinity and selectivity for the A(2B) AR subtype, we further investigated the class of 3-aryl[1,2,4]triazino[4,3-a]benzimidazol-4(10H)-ones V, previously disclosed by us as selective A(1) AR antagonists. Preliminary assays on a number of triazinobenzimidazoles derived from our "in-house" collection revealed that all the derivatives selected showed significant affinity at A(2B) AR, no affinity at A(3) AR, and various degrees of selectivity toward A(1) and A(2A) ARs. Investigation of a new series featuring modified substituents at the 10-position (4'-chlorophenyl or phenylethyl groups), and a chlorine atom at the 7-position (X) of the triazinobenzimidazole nucleus, yielded highly potent and selective A(2B) AR antagonists. The presence of a pendant 3-phenyl ring appears to hamper the interaction with A(2A) AR, conferring high A(2B)/A(2A) AR selectivity. Derivative 13 (X = Cl, R = C(6)H(5)) is the most potent and selective compound, with an IC(50) of 3.10 nM at A(2B) AR and no affinity at A(1), A(2A), and A(3) ARs.
|
Displacement of [125I]AB-MECA from human A3 adenosine receptor expressed in CHO cell membrane
|
Homo sapiens
|
0.22
nM
|
|
Journal : J. Med. Chem.
Title : 3-aryl-[1,2,4]triazino[4,3-a]benzimidazol-4(10H)-one: a novel template for the design of highly selective A₂B adenosine receptor antagonists.
Year : 2012
Volume : 55
Issue : 4
First Page : 1490
Last Page : 1499
Authors : Taliani S, Pugliesi I, Barresi E, Simorini F, Salerno S, La Motta C, Marini AM, Cosimelli B, Cosconati S, Di Maro S, Marinelli L, Daniele S, Trincavelli ML, Greco G, Novellino E, Martini C, Da Settimo F.
Abstract : In an effort to identify novel ligands possessing high affinity and selectivity for the A(2B) AR subtype, we further investigated the class of 3-aryl[1,2,4]triazino[4,3-a]benzimidazol-4(10H)-ones V, previously disclosed by us as selective A(1) AR antagonists. Preliminary assays on a number of triazinobenzimidazoles derived from our "in-house" collection revealed that all the derivatives selected showed significant affinity at A(2B) AR, no affinity at A(3) AR, and various degrees of selectivity toward A(1) and A(2A) ARs. Investigation of a new series featuring modified substituents at the 10-position (4'-chlorophenyl or phenylethyl groups), and a chlorine atom at the 7-position (X) of the triazinobenzimidazole nucleus, yielded highly potent and selective A(2B) AR antagonists. The presence of a pendant 3-phenyl ring appears to hamper the interaction with A(2A) AR, conferring high A(2B)/A(2A) AR selectivity. Derivative 13 (X = Cl, R = C(6)H(5)) is the most potent and selective compound, with an IC(50) of 3.10 nM at A(2B) AR and no affinity at A(1), A(2A), and A(3) ARs.
|
Displacement of [125I]I-AB-MECA from human recombinant adenosine A3 receptor expressed in CHO cells after 60 mins by gamma counter
|
Homo sapiens
|
2.2
nM
|
|
Journal : J. Med. Chem.
Title : Medicinal chemistry of A₃ adenosine receptor modulators: pharmacological activities and therapeutic implications.
Year : 2012
Volume : 55
Issue : 12
First Page : 5676
Last Page : 5703
Authors : Baraldi PG, Preti D, Borea PA, Varani K.
|
Displacement of [125I]I-AB-MECA from human rat adenosine A3 receptor expressed in CHO cells after 60 mins by gamma counter
|
Rattus norvegicus
|
0.33
nM
|
|
Journal : J. Med. Chem.
Title : Medicinal chemistry of A₃ adenosine receptor modulators: pharmacological activities and therapeutic implications.
Year : 2012
Volume : 55
Issue : 12
First Page : 5676
Last Page : 5703
Authors : Baraldi PG, Preti D, Borea PA, Varani K.
|
Displacement of [3H]CCPA from rat adenosine A1 receptor expressed in CHO cells after 60 mins by gamma counter
|
Rattus norvegicus
|
820.0
nM
|
|
Journal : J. Med. Chem.
Title : Medicinal chemistry of A₃ adenosine receptor modulators: pharmacological activities and therapeutic implications.
Year : 2012
Volume : 55
Issue : 12
First Page : 5676
Last Page : 5703
Authors : Baraldi PG, Preti D, Borea PA, Varani K.
|
Displacement of [3H]CGS21680 from rat adenosine A2A receptor expressed in CHO cells after 60 mins by gamma counter
|
Rattus norvegicus
|
470.0
nM
|
|
Journal : J. Med. Chem.
Title : Medicinal chemistry of A₃ adenosine receptor modulators: pharmacological activities and therapeutic implications.
Year : 2012
Volume : 55
Issue : 12
First Page : 5676
Last Page : 5703
Authors : Baraldi PG, Preti D, Borea PA, Varani K.
|
Agonist activity at mouse adenosine A3 receptor expressed in HEK293 cell membranes assessed as inhibition of forskolin-stimulated cAMP production preincubated for 30 mins prior to forskolin-treatment measured after 15 mins by ELISA
|
Mus musculus
|
0.15
nM
|
|
Journal : J. Med. Chem.
Title : Rational design of sulfonated A3 adenosine receptor-selective nucleosides as pharmacological tools to study chronic neuropathic pain.
Year : 2013
Volume : 56
Issue : 14
First Page : 5949
Last Page : 5963
Authors : Paoletta S, Tosh DK, Finley A, Gizewski ET, Moss SM, Gao ZG, Auchampach JA, Salvemini D, Jacobson KA.
Abstract : (N)-Methanocarba(bicyclo[3.1.0]hexane)adenosine derivatives were probed for sites of charged sulfonate substitution, which precludes diffusion across biological membranes, e.g., blood-brain barrier. Molecular modeling predicted that sulfonate groups on C2-phenylethynyl substituents would provide high affinity at both mouse (m) and human (h) A3 adenosine receptors (ARs), while a N(6)-p-sulfophenylethyl substituent would determine higher hA3AR vs mA3AR affinity. These modeling predictions, based on steric fitting of the binding cavity and crucial interactions with key residues, were confirmed by binding/efficacy studies of synthesized sulfonates. N(6)-3-Chlorobenzyl-2-(3-sulfophenylethynyl) derivative 7 (MRS5841) bound selectively to h/m A3ARs (Ki(hA3AR) = 1.9 nM) as agonist, while corresponding p-sulfo isomer 6 (MRS5701) displayed mixed A1/A3AR agonism. Both nucleosides administered ip reduced mouse chronic neuropathic pain that was ascribed to either A3AR or A1/A3AR using A3AR genetic deletion. Thus, rational design methods based on A3AR homology models successfully predicted sites for sulfonate incorporation, for delineating adenosine's CNS vs peripheral actions.
|
Displacement of [125I]I-AB-MECA from human adenosine A3 receptor expressed in CHO cells after 90 mins by gamma counting analysis
|
Homo sapiens
|
1.4
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Fluorescent ligands for adenosine receptors.
Year : 2013
Volume : 23
Issue : 1
First Page : 26
Last Page : 36
Authors : Kozma E, Jayasekara PS, Squarcialupi L, Paoletta S, Moro S, Federico S, Spalluto G, Jacobson KA.
Abstract : Interest is increasing in developing fluorescent ligands for characterization of adenosine receptors (ARs), which hold a promise of usefulness in the drug discovery process. The size of a strategically labeled AR ligand can be greatly increased after the attachment of a fluorophore. The choice of dye moiety (e.g. Alexa Fluor 488), attachment point and linker length can alter the selectivity and potency of the parent molecule. Fluorescent derivatives of adenosine agonists and antagonists (e.g. XAC and other heterocyclic antagonist scaffolds) have been synthesized and characterized pharmacologically. Some are useful AR probes for flow cytometry, fluorescence correlation spectroscopy, fluorescence microscopy, fluorescence polarization, fluorescence resonance energy transfer, and scanning confocal microscopy. Thus, the approach of fluorescent labeled GPCR ligands, including those for ARs, is a growing dynamic research field.
|
Competitive binding affinity to human adenosine A3 receptor expressed in CHO cells after 90 mins by flow cytometric analysis in presence of MRS5449
|
Homo sapiens
|
27.7
nM
|
|
Journal : Bioorg. Med. Chem. Lett.
Title : Fluorescent ligands for adenosine receptors.
Year : 2013
Volume : 23
Issue : 1
First Page : 26
Last Page : 36
Authors : Kozma E, Jayasekara PS, Squarcialupi L, Paoletta S, Moro S, Federico S, Spalluto G, Jacobson KA.
Abstract : Interest is increasing in developing fluorescent ligands for characterization of adenosine receptors (ARs), which hold a promise of usefulness in the drug discovery process. The size of a strategically labeled AR ligand can be greatly increased after the attachment of a fluorophore. The choice of dye moiety (e.g. Alexa Fluor 488), attachment point and linker length can alter the selectivity and potency of the parent molecule. Fluorescent derivatives of adenosine agonists and antagonists (e.g. XAC and other heterocyclic antagonist scaffolds) have been synthesized and characterized pharmacologically. Some are useful AR probes for flow cytometry, fluorescence correlation spectroscopy, fluorescence microscopy, fluorescence polarization, fluorescence resonance energy transfer, and scanning confocal microscopy. Thus, the approach of fluorescent labeled GPCR ligands, including those for ARs, is a growing dynamic research field.
|
Displacement of [125I]AB-MECA from human adenosine A3 receptor expressed in CHO cell membrane after 90 mins
|
Homo sapiens
|
0.22
nM
|
|
Journal : Eur. J. Med. Chem.
Title : Modulation of A2B adenosine receptor by 1-Benzyl-3-ketoindole derivatives.
Year : 2013
Volume : 69
First Page : 331
Last Page : 337
Authors : Taliani S, Trincavelli ML, Cosimelli B, Laneri S, Severi E, Barresi E, Pugliesi I, Daniele S, Giacomelli C, Greco G, Novellino E, Martini C, Da Settimo F.
Abstract : We have disclosed a series of 1-benzyl-3-ketoindole derivatives acting as either positive or negative modulators of the human A(2B) adenosine receptor (A(2B) AR) depending on small differences in their side chain. The new compounds were designed taking into account structural similarities between AR antagonists and ligands of the GABA(A)/benzodiazepine receptor. All compounds resulted totally inactive at A(2A) and A₃ ARs and showed small (8a,b) or none (7a,b, 8c and 9a,b) affinity for A₁ AR. When tested on A(2B) AR-transfected CHO cells, 7a,b and 8a acted as positive modulators, whereas 8b,c and 9a,b acted as negative modulators, enhancing or weakening the NECA-induced increase of cAMP levels, respectively. Compounds 7-9 might be regarded as useful biological and pharmacological tools to explore the therapeutic potential of A(2B) AR modulators, while their 3-ketoindole scaffold might be taken as a reference to design new analogs.
|
Displacement of [3H]NECA from human adenosine A2A receptor expressed in CHO cell membrane after 90 mins
|
Homo sapiens
|
401.0
nM
|
|
Journal : Eur. J. Med. Chem.
Title : Modulation of A2B adenosine receptor by 1-Benzyl-3-ketoindole derivatives.
Year : 2013
Volume : 69
First Page : 331
Last Page : 337
Authors : Taliani S, Trincavelli ML, Cosimelli B, Laneri S, Severi E, Barresi E, Pugliesi I, Daniele S, Giacomelli C, Greco G, Novellino E, Martini C, Da Settimo F.
Abstract : We have disclosed a series of 1-benzyl-3-ketoindole derivatives acting as either positive or negative modulators of the human A(2B) adenosine receptor (A(2B) AR) depending on small differences in their side chain. The new compounds were designed taking into account structural similarities between AR antagonists and ligands of the GABA(A)/benzodiazepine receptor. All compounds resulted totally inactive at A(2A) and A₃ ARs and showed small (8a,b) or none (7a,b, 8c and 9a,b) affinity for A₁ AR. When tested on A(2B) AR-transfected CHO cells, 7a,b and 8a acted as positive modulators, whereas 8b,c and 9a,b acted as negative modulators, enhancing or weakening the NECA-induced increase of cAMP levels, respectively. Compounds 7-9 might be regarded as useful biological and pharmacological tools to explore the therapeutic potential of A(2B) AR modulators, while their 3-ketoindole scaffold might be taken as a reference to design new analogs.
|
Displacement of [3H]DPCPX from human adenosine A1 receptor expressed in CHO cell membrane after 180 mins
|
Homo sapiens
|
890.0
nM
|
|
Journal : Eur. J. Med. Chem.
Title : Modulation of A2B adenosine receptor by 1-Benzyl-3-ketoindole derivatives.
Year : 2013
Volume : 69
First Page : 331
Last Page : 337
Authors : Taliani S, Trincavelli ML, Cosimelli B, Laneri S, Severi E, Barresi E, Pugliesi I, Daniele S, Giacomelli C, Greco G, Novellino E, Martini C, Da Settimo F.
Abstract : We have disclosed a series of 1-benzyl-3-ketoindole derivatives acting as either positive or negative modulators of the human A(2B) adenosine receptor (A(2B) AR) depending on small differences in their side chain. The new compounds were designed taking into account structural similarities between AR antagonists and ligands of the GABA(A)/benzodiazepine receptor. All compounds resulted totally inactive at A(2A) and A₃ ARs and showed small (8a,b) or none (7a,b, 8c and 9a,b) affinity for A₁ AR. When tested on A(2B) AR-transfected CHO cells, 7a,b and 8a acted as positive modulators, whereas 8b,c and 9a,b acted as negative modulators, enhancing or weakening the NECA-induced increase of cAMP levels, respectively. Compounds 7-9 might be regarded as useful biological and pharmacological tools to explore the therapeutic potential of A(2B) AR modulators, while their 3-ketoindole scaffold might be taken as a reference to design new analogs.
|
Binding affinity to A3AR (unknown origin)
|
Homo sapiens
|
1.0
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Synthesis and evaluation of N⁶-substituted apioadenosines as potential adenosine A₃ receptor modulators.
Year : 2014
Volume : 22
Issue : 15
First Page : 4257
Last Page : 4268
Authors : Toti KS, Moss SM, Paoletta S, Gao ZG, Jacobson KA, Van Calenbergh S.
Abstract : Adenosine receptors (ARs) trigger signal transduction pathways inside the cell when activated by extracellular adenosine. Selective modulation of the A₃AR subtype may be beneficial in controlling diseases such as colorectal cancer and rheumatoid arthritis. Here, we report the synthesis and evaluation of β-D-apio-D-furano- and α-D-apio-L-furanoadenosines and derivatives thereof. Introduction of a 2-methoxy-5-chlorobenzyl group at N(6) of β-D-apio-D-furanoadenosine afforded an A₃AR antagonist (10c, Ki=0.98 μM), while a similar modification of an α-D-apio-L-furanoadenosine gave rise to a partial agonist (11c, Ki=3.07 μM). The structural basis for this difference was examined by docking to an A₃AR model; the antagonist lacked a crucial interaction with Thr94.
|
Agonist activity at human recombinant A3AR expressed in CHO cells assessed as inhibition of forskolin-induced stimulation of cAMP production
|
Homo sapiens
|
1.21
nM
|
|
Journal : Bioorg. Med. Chem.
Title : Synthesis and evaluation of N⁶-substituted apioadenosines as potential adenosine A₃ receptor modulators.
Year : 2014
Volume : 22
Issue : 15
First Page : 4257
Last Page : 4268
Authors : Toti KS, Moss SM, Paoletta S, Gao ZG, Jacobson KA, Van Calenbergh S.
Abstract : Adenosine receptors (ARs) trigger signal transduction pathways inside the cell when activated by extracellular adenosine. Selective modulation of the A₃AR subtype may be beneficial in controlling diseases such as colorectal cancer and rheumatoid arthritis. Here, we report the synthesis and evaluation of β-D-apio-D-furano- and α-D-apio-L-furanoadenosines and derivatives thereof. Introduction of a 2-methoxy-5-chlorobenzyl group at N(6) of β-D-apio-D-furanoadenosine afforded an A₃AR antagonist (10c, Ki=0.98 μM), while a similar modification of an α-D-apio-L-furanoadenosine gave rise to a partial agonist (11c, Ki=3.07 μM). The structural basis for this difference was examined by docking to an A₃AR model; the antagonist lacked a crucial interaction with Thr94.
|
Binding affinity to Adenosine receptor A3 (unknown origin)
|
Homo sapiens
|
1.4
nM
|
|
Journal : J. Med. Chem.
Title : Tactical Approaches to Interconverting GPCR Agonists and Antagonists.
Year : 2016
Volume : 59
Issue : 3
First Page : 810
Last Page : 840
Authors : Dosa PI, Amin EA.
Abstract : There are many reported examples of small structural modifications to GPCR-targeted ligands leading to major changes in their functional activity, converting agonists into antagonists or vice versa. These shifts in functional activity are often accompanied by negligible changes in binding affinity. The current perspective focuses on outlining and analyzing various approaches that have been used to interconvert GPCR agonists, partial agonists, and antagonists in order to achieve the intended functional activity at a GPCR of therapeutic interest. An improved understanding of specific structural modifications that are likely to alter the functional activity of a GPCR ligand may be of use to researchers designing GPCR-targeted drugs and/or probe compounds, specifically in cases where a particular ligand exhibits good potency but not the preferred functional activity at the GPCR of choice.
|
Agonist activity at mouse adenosine A3 receptor expressed in HEK293 cell membranes assessed as inhibition of forskolin-stimulated cAMP accumulation preincubated for 30 mins followed by forsolkin addition measured after 15 mins by immunoassay
|
Mus musculus
|
0.46
nM
|
|
Journal : J. Med. Chem.
Title : Purine (N)-Methanocarba Nucleoside Derivatives Lacking an Exocyclic Amine as Selective A3 Adenosine Receptor Agonists.
Year : 2016
Volume : 59
Issue : 7
First Page : 3249
Last Page : 3263
Authors : Tosh DK, Ciancetta A, Warnick E, O'Connor R, Chen Z, Gizewski E, Crane S, Gao ZG, Auchampach JA, Salvemini D, Jacobson KA.
Abstract : Purine (N)-methanocarba-5'-N-alkyluronamidoriboside A3 adenosine receptor (A3AR) agonists lacking an exocyclic amine resulted from an unexpected reaction during a Sonogashira coupling and subsequent aminolysis. Because the initial C6-Me and C6-styryl derivatives had unexpectedly high A3AR affinity, other rigid nucleoside analogues lacking an exocyclic amine were prepared. Of these, the C6-Me-(2-phenylethynyl) and C2-(5-chlorothienylethynyl) analogues were particularly potent, with human A3AR Ki values of 6 and 42 nM, respectively. Additionally, the C2-(5-chlorothienyl)-6-H analogue was potent and selective at A3AR (MRS7220, Ki 60 nM) and also completely reversed mouse sciatic nerve mechanoallodynia (in vivo, 3 μmol/kg, po). The lack of a C6 H-bond donor while maintaining A3AR affinity and efficacy could be rationalized by homology modeling and docking of these hypermodified nucleosides. The modeling suggests that a suitable combination of stabilizing features can partially compensate for the lack of an exocyclic amine, an otherwise important contributor to recognition in the A3AR binding site.
|
Displacement of [3H]WAY100635 from human 5-HT1AR expressed in CHO cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]5-CT from human 5-HT1BR expressed in HEK cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]5-CT from human 5-HT1D receptor expressed in HEK-T cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]5-HT from human 5-HT1E receptor expressed in HEK cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]GR113808 from human 5-HT4 receptor at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]LSD from human 5-HT6 receptor expressed in HEK cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]LSD from human 5-HT7A receptor expressed in HEK cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]GR65630 from human 5-HT3 receptor expressed in HEK-T cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]LSD from human 5-HT5A receptor expressed in Flp-In-CHO cell membranes incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]ketanserin from human 5-HT2A receptor expressed in HEK-T cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
30.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]lysergic from human 5-HT2BR expressed in HEK cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]mesulergine from human 5-HT2CR expressed in Flp-In HEK cell membranes at 10 uM incubated for 90 mins under dark condition by microbeta scintillation counting method relative to control
|
Homo sapiens
|
50.0
%
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [3H]N6-phenylisopropyladenosine from recombinant human A1AR expressed in CHO cell membranes after 60 mins by liquid scintillation counting method
|
Homo sapiens
|
220.0
nM
|
|
Journal : J Med Chem
Title : Structure-Based Scaffold Repurposing for G Protein-Coupled Receptors: Transformation of Adenosine Derivatives into 5HT2B/5HT2C Serotonin Receptor Antagonists.
Year : 2016
Volume : 59
Issue : 24
First Page : 11006
Last Page : 11026
Authors : Tosh DK, Ciancetta A, Warnick E, Crane S, Gao ZG, Jacobson KA.
Abstract : Adenosine derivatives developed to activate adenosine receptors (ARs) revealed micromolar activity at serotonin 5HT2B and 5HT2C receptors (5HTRs). We explored the structure-activity relationship at 5HT2Rs and modeled receptor interactions in order to optimize affinity and simultaneously reduce AR affinity. Depending on N6 substitution, small 5'-alkylamide modification maintained 5HT2BR affinity, which was enhanced upon ribose substitution with rigid bicyclo[3.1.0]hexane (North (N)-methanocarba), e.g., N6-dicyclopropylmethyl 4'-CH2OH derivative 14 (Ki 11 nM). 5'-Methylamide 23 was 170-fold selective as antagonist for 5HT2BR vs 5HT2CR. 5'-Methyl 25 and ethyl 26 esters potently antagonized 5HT2Rs with moderate selectivity in comparison to ARs; related 6-N,N-dimethylamino analogue 30 was 5HT2R-selective. 5' position flexibility of substitution was indicated in 5HT2BR docking. Both 5'-ester and 5'-amide derivatives displayed in vivo t1/2 of 3-4 h. Thus, we used G protein-coupled receptor modeling to repurpose nucleoside scaffolds in favor of binding at nonpurine receptors as novel 5HT2R antagonists, with potential for cardioprotection, liver protection, or central nervous system activity.
|
Displacement of [125I]I-AB-MECA from human adenosine A3 receptor expressed in CHO cells after 60 mins by gamma counting analysis
|
Homo sapiens
|
1.4
nM
|
|
Journal : J Med Chem
Title : N6-Substituted 5'-N-Methylcarbamoyl-4'-selenoadenosines as Potent and Selective A3 Adenosine Receptor Agonists with Unusual Sugar Puckering and Nucleobase Orientation.
Year : 2017
Volume : 60
Issue : 8
First Page : 3422
Last Page : 3437
Authors : Yu J, Zhao LX, Park J, Lee HW, Sahu PK, Cui M, Moss SM, Hammes E, Warnick E, Gao ZG, Noh M, Choi S, Ahn HC, Choi J, Jacobson KA, Jeong LS.
Abstract : Potent and selective A3 adenosine receptor (AR) agonists were identified by the replacement of 4'-oxo- or 4'-thionucleosides with bioisosteric selenium. Unlike previous agonists, 4'-seleno analogues preferred a glycosidic syn conformation and South sugar puckering, as shown in the X-ray crystal structure of 5'-N-methylcarbamoyl derivative 3p. Among the compounds tested, N6-3-iodobenzyl analogue 3d was found to be the most potent A3AR full agonist (Ki = 0.57 nM), which was ≥800- and 1900-fold selective for A1AR and A2AAR, respectively. In the N6-cycloalkyl series, 2-Cl analogues generally exhibited better hA3AR affinity than 2-H analogues, whereas 2-H > 2-Cl in the N6-3-halobenzyl series. N7 isomers 3t and 3u were much weaker in binding than corresponding N9 isomers, but compound 3t lacked A3AR activation, appearing to be a weak antagonist. 2-Cl-N6-3-iodobenzyl analogue 3p inhibited chemoattractant-induced migration of microglia/monocytes without inducing cell death at ≤50 μM. This suggests the potential for the development of 4'-selenonucleoside A3AR agonists as novel antistroke agents.
|
Displacement of [125I]I-AB-MECA from human A3 adenosine receptor expressed in CHO cell membranes after 60 mins by gamma counting method
|
Homo sapiens
|
1.4
nM
|
|
Journal : J Med Chem
Title : Polypharmacology of N6-(3-Iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) and Related A3 Adenosine Receptor Ligands: Peroxisome Proliferator Activated Receptor (PPAR) γ Partial Agonist and PPARδ Antagonist Activity Suggests Their Antidiabetic Potential.
Year : 2017
Volume : 60
Issue : 17
First Page : 7459
Last Page : 7475
Authors : Yu J, Ahn S, Kim HJ, Lee M, Ahn S, Kim J, Jin SH, Lee E, Kim G, Cheong JH, Jacobson KA, Jeong LS, Noh M.
Abstract : A3 adenosine receptor (AR) ligands including A3 AR agonist, N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (1a, IB-MECA) were examined for adiponectin production in human bone marrow mesenchymal stem cells (hBM-MSCs). In this model, 1a significantly increased adiponectin production, which is associated with improved insulin sensitivity. However, A3 AR antagonists also promoted adiponectin production in hBM-MSCs, indicating that the A3 AR pathway may not be directly involved in the adiponectin promoting activity. In a target deconvolution study, their adiponectin-promoting activity was significantly correlated to their binding activity to both peroxisome proliferator activated receptor (PPAR) γ and PPARδ. They functioned as both PPARγ partial agonists and PPARδ antagonists. In the diabetic mouse model, 1a and its structural analogues A3 AR antagonists significantly decreased the serum levels of glucose and triglyceride, supporting their antidiabetic potential. These findings indicate that the polypharmacophore of these compounds may provide therapeutic insight into their multipotent efficacy against various human diseases.
|
Displacement of [3H]CCPA from human A1 receptor expressed in CHO cell membranes after 60 mins by gamma counting method
|
Homo sapiens
|
222.0
nM
|
|
Journal : J Med Chem
Title : Polypharmacology of N6-(3-Iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) and Related A3 Adenosine Receptor Ligands: Peroxisome Proliferator Activated Receptor (PPAR) γ Partial Agonist and PPARδ Antagonist Activity Suggests Their Antidiabetic Potential.
Year : 2017
Volume : 60
Issue : 17
First Page : 7459
Last Page : 7475
Authors : Yu J, Ahn S, Kim HJ, Lee M, Ahn S, Kim J, Jin SH, Lee E, Kim G, Cheong JH, Jacobson KA, Jeong LS, Noh M.
Abstract : A3 adenosine receptor (AR) ligands including A3 AR agonist, N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (1a, IB-MECA) were examined for adiponectin production in human bone marrow mesenchymal stem cells (hBM-MSCs). In this model, 1a significantly increased adiponectin production, which is associated with improved insulin sensitivity. However, A3 AR antagonists also promoted adiponectin production in hBM-MSCs, indicating that the A3 AR pathway may not be directly involved in the adiponectin promoting activity. In a target deconvolution study, their adiponectin-promoting activity was significantly correlated to their binding activity to both peroxisome proliferator activated receptor (PPAR) γ and PPARδ. They functioned as both PPARγ partial agonists and PPARδ antagonists. In the diabetic mouse model, 1a and its structural analogues A3 AR antagonists significantly decreased the serum levels of glucose and triglyceride, supporting their antidiabetic potential. These findings indicate that the polypharmacophore of these compounds may provide therapeutic insight into their multipotent efficacy against various human diseases.
|
Displacement of Fluormone-Pan-PPAR Green from human GST-tagged PPARgamma LBD at 4 uM by TR-FRET assay relative to control
|
Homo sapiens
|
59.0
%
|
|
Journal : J Med Chem
Title : Polypharmacology of N6-(3-Iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) and Related A3 Adenosine Receptor Ligands: Peroxisome Proliferator Activated Receptor (PPAR) γ Partial Agonist and PPARδ Antagonist Activity Suggests Their Antidiabetic Potential.
Year : 2017
Volume : 60
Issue : 17
First Page : 7459
Last Page : 7475
Authors : Yu J, Ahn S, Kim HJ, Lee M, Ahn S, Kim J, Jin SH, Lee E, Kim G, Cheong JH, Jacobson KA, Jeong LS, Noh M.
Abstract : A3 adenosine receptor (AR) ligands including A3 AR agonist, N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (1a, IB-MECA) were examined for adiponectin production in human bone marrow mesenchymal stem cells (hBM-MSCs). In this model, 1a significantly increased adiponectin production, which is associated with improved insulin sensitivity. However, A3 AR antagonists also promoted adiponectin production in hBM-MSCs, indicating that the A3 AR pathway may not be directly involved in the adiponectin promoting activity. In a target deconvolution study, their adiponectin-promoting activity was significantly correlated to their binding activity to both peroxisome proliferator activated receptor (PPAR) γ and PPARδ. They functioned as both PPARγ partial agonists and PPARδ antagonists. In the diabetic mouse model, 1a and its structural analogues A3 AR antagonists significantly decreased the serum levels of glucose and triglyceride, supporting their antidiabetic potential. These findings indicate that the polypharmacophore of these compounds may provide therapeutic insight into their multipotent efficacy against various human diseases.
|
Displacement of Fluormone-Pan-PPAR Green from human GST-tagged PPARdelta LBD at 4 uM by TR-FRET assay relative to control
|
Homo sapiens
|
75.0
%
|
|
Journal : J Med Chem
Title : Polypharmacology of N6-(3-Iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) and Related A3 Adenosine Receptor Ligands: Peroxisome Proliferator Activated Receptor (PPAR) γ Partial Agonist and PPARδ Antagonist Activity Suggests Their Antidiabetic Potential.
Year : 2017
Volume : 60
Issue : 17
First Page : 7459
Last Page : 7475
Authors : Yu J, Ahn S, Kim HJ, Lee M, Ahn S, Kim J, Jin SH, Lee E, Kim G, Cheong JH, Jacobson KA, Jeong LS, Noh M.
Abstract : A3 adenosine receptor (AR) ligands including A3 AR agonist, N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (1a, IB-MECA) were examined for adiponectin production in human bone marrow mesenchymal stem cells (hBM-MSCs). In this model, 1a significantly increased adiponectin production, which is associated with improved insulin sensitivity. However, A3 AR antagonists also promoted adiponectin production in hBM-MSCs, indicating that the A3 AR pathway may not be directly involved in the adiponectin promoting activity. In a target deconvolution study, their adiponectin-promoting activity was significantly correlated to their binding activity to both peroxisome proliferator activated receptor (PPAR) γ and PPARδ. They functioned as both PPARγ partial agonists and PPARδ antagonists. In the diabetic mouse model, 1a and its structural analogues A3 AR antagonists significantly decreased the serum levels of glucose and triglyceride, supporting their antidiabetic potential. These findings indicate that the polypharmacophore of these compounds may provide therapeutic insight into their multipotent efficacy against various human diseases.
|
Displacement of Fluormone-Pan-PPAR Green from human GST-tagged PPARalpha LBD at 20 uM by TR-FRET assay relative to control
|
Homo sapiens
|
46.5
%
|
|
Journal : J Med Chem
Title : Polypharmacology of N6-(3-Iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) and Related A3 Adenosine Receptor Ligands: Peroxisome Proliferator Activated Receptor (PPAR) γ Partial Agonist and PPARδ Antagonist Activity Suggests Their Antidiabetic Potential.
Year : 2017
Volume : 60
Issue : 17
First Page : 7459
Last Page : 7475
Authors : Yu J, Ahn S, Kim HJ, Lee M, Ahn S, Kim J, Jin SH, Lee E, Kim G, Cheong JH, Jacobson KA, Jeong LS, Noh M.
Abstract : A3 adenosine receptor (AR) ligands including A3 AR agonist, N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (1a, IB-MECA) were examined for adiponectin production in human bone marrow mesenchymal stem cells (hBM-MSCs). In this model, 1a significantly increased adiponectin production, which is associated with improved insulin sensitivity. However, A3 AR antagonists also promoted adiponectin production in hBM-MSCs, indicating that the A3 AR pathway may not be directly involved in the adiponectin promoting activity. In a target deconvolution study, their adiponectin-promoting activity was significantly correlated to their binding activity to both peroxisome proliferator activated receptor (PPAR) γ and PPARδ. They functioned as both PPARγ partial agonists and PPARδ antagonists. In the diabetic mouse model, 1a and its structural analogues A3 AR antagonists significantly decreased the serum levels of glucose and triglyceride, supporting their antidiabetic potential. These findings indicate that the polypharmacophore of these compounds may provide therapeutic insight into their multipotent efficacy against various human diseases.
|
Displacement of Fluormone-Pan-PPAR Green from human GST-tagged PPARgamma LBD by TR-FRET assay
|
Homo sapiens
|
2.18
nM
|
|
Journal : J Med Chem
Title : Polypharmacology of N6-(3-Iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) and Related A3 Adenosine Receptor Ligands: Peroxisome Proliferator Activated Receptor (PPAR) γ Partial Agonist and PPARδ Antagonist Activity Suggests Their Antidiabetic Potential.
Year : 2017
Volume : 60
Issue : 17
First Page : 7459
Last Page : 7475
Authors : Yu J, Ahn S, Kim HJ, Lee M, Ahn S, Kim J, Jin SH, Lee E, Kim G, Cheong JH, Jacobson KA, Jeong LS, Noh M.
Abstract : A3 adenosine receptor (AR) ligands including A3 AR agonist, N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (1a, IB-MECA) were examined for adiponectin production in human bone marrow mesenchymal stem cells (hBM-MSCs). In this model, 1a significantly increased adiponectin production, which is associated with improved insulin sensitivity. However, A3 AR antagonists also promoted adiponectin production in hBM-MSCs, indicating that the A3 AR pathway may not be directly involved in the adiponectin promoting activity. In a target deconvolution study, their adiponectin-promoting activity was significantly correlated to their binding activity to both peroxisome proliferator activated receptor (PPAR) γ and PPARδ. They functioned as both PPARγ partial agonists and PPARδ antagonists. In the diabetic mouse model, 1a and its structural analogues A3 AR antagonists significantly decreased the serum levels of glucose and triglyceride, supporting their antidiabetic potential. These findings indicate that the polypharmacophore of these compounds may provide therapeutic insight into their multipotent efficacy against various human diseases.
|
Displacement of Fluormone-Pan-PPAR Green from human GST-tagged PPARdelta LBD by TR-FRET assay
|
Homo sapiens
|
0.43
nM
|
|
Journal : J Med Chem
Title : Polypharmacology of N6-(3-Iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) and Related A3 Adenosine Receptor Ligands: Peroxisome Proliferator Activated Receptor (PPAR) γ Partial Agonist and PPARδ Antagonist Activity Suggests Their Antidiabetic Potential.
Year : 2017
Volume : 60
Issue : 17
First Page : 7459
Last Page : 7475
Authors : Yu J, Ahn S, Kim HJ, Lee M, Ahn S, Kim J, Jin SH, Lee E, Kim G, Cheong JH, Jacobson KA, Jeong LS, Noh M.
Abstract : A3 adenosine receptor (AR) ligands including A3 AR agonist, N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (1a, IB-MECA) were examined for adiponectin production in human bone marrow mesenchymal stem cells (hBM-MSCs). In this model, 1a significantly increased adiponectin production, which is associated with improved insulin sensitivity. However, A3 AR antagonists also promoted adiponectin production in hBM-MSCs, indicating that the A3 AR pathway may not be directly involved in the adiponectin promoting activity. In a target deconvolution study, their adiponectin-promoting activity was significantly correlated to their binding activity to both peroxisome proliferator activated receptor (PPAR) γ and PPARδ. They functioned as both PPARγ partial agonists and PPARδ antagonists. In the diabetic mouse model, 1a and its structural analogues A3 AR antagonists significantly decreased the serum levels of glucose and triglyceride, supporting their antidiabetic potential. These findings indicate that the polypharmacophore of these compounds may provide therapeutic insight into their multipotent efficacy against various human diseases.
|
Displacement of [3H]NECA from recombinant human adenosine A3 receptor expressed in CHO cell membranes measured after 180 mins
|
Homo sapiens
|
0.2
nM
|
|
Journal : MedChemComm
Title : Studies on enantioselectivity of chiral 4-acetylamino-6-alkyloxy-2-alkylthiopyrimidines acting as antagonists of the human A<sub>3</sub> adenosine receptor.
Year : 2018
Volume : 9
Issue : 1
First Page : 81
Last Page : 86
Authors : Cosimelli B, Greco G, Laneri S, Novellino E, Sacchi A, Collina S, Rossi D, Cosconati S, Barresi E, Taliani S, Trincavelli ML, Martini C.
Abstract : Three A<sub>3</sub> adenosine receptor (AR) antagonists (<b>1-3</b>) selected from 4-acylamino-6-alkyloxy-2-alkylthiopyrimidines previously investigated by us were modified by inserting a methyl group on their ether or thioether side chains. These compounds gave us the chance to evaluate whether their higher lipophilicity, reduced conformational freedom and chirality might improve the potency towards the A<sub>3</sub> AR. Racemic mixtures of <b>1-3</b> were resolved using chiral HPLC methods and the absolute configurations of the enantiomers were assigned by chiroptical spectroscopy and density functional theory calculations. We measured the affinity for human A<sub>1</sub>, A<sub>2A</sub>, A<sub>2B</sub> and A<sub>3</sub> ARs of the racemic mixtures and the pure enantiomers of <b>1-3</b> by radioligand competition binding experiments. Cell-based assays of the most potent enantiomers confirmed their A<sub>3</sub> AR antagonist profiles. Our research led to the identification of (<i>S</i>)-<b>1</b> with high potency (0.5 nM) and selectivity as an A<sub>3</sub> AR antagonist. Moreover we built a docking-model useful to design new pyrimidine derivatives.
|
Displacement of [3H]CCPA from human adenosine A1 receptor expressed in CHO cell membranes after 3 hrs by micro beta scintillation counting method
|
Homo sapiens
|
220.0
nM
|
|
Journal : Eur J Med Chem
Title : [1,2,4]Triazolo[1,5-c]pyrimidines as adenosine receptor antagonists: Modifications at the 8 position to reach selectivity towards A3 adenosine receptor subtype.
Year : 2018
Volume : 157
First Page : 837
Last Page : 851
Authors : Federico S, Margiotta E, Salmaso V, Pastorin G, Kachler S, Klotz KN, Moro S, Spalluto G.
Abstract : [1,2,4]Triazolo[1,5-c]pyrimidine is a promising platform to develop adenosine receptor antagonists. Here, we tried to investigate the effect of the substituent at the 8 position of [1,2,4]triazolo[1,5-c]pyrimidine derivatives on affinity and selectivity at the human A3 adenosine receptor subtype. In particular, we have introduced both esters and amides, principally with a benzylic nature. In addition, a small series of 5-substituted [1,2,4]triazolo[1,5-c]pyrimidines was designed in order to complete the structure-activity relationship analysis. Several of these new compounds showed affinity towards human A3 adenosine receptor in the low nanomolar range, with the most potent derivative of the series bringing a 4-ethylbenzylester at the 8 position (compound 18, hA3AR Ki = 1.21 nM). Docking studies performed on the synthesized compounds inside models of human A1, A2A and A3 adenosine receptors showed similar binding modes, comparable with the typical crystallographic binding mode of the inverse agonist ZM-241,385.
|
Displacement of [3H]HEMADO from human adenosine A3 receptor expressed in CHO cell membranes after 3 hrs by micro beta scintillation counting method
|
Homo sapiens
|
1.4
nM
|
|
Journal : Eur J Med Chem
Title : [1,2,4]Triazolo[1,5-c]pyrimidines as adenosine receptor antagonists: Modifications at the 8 position to reach selectivity towards A3 adenosine receptor subtype.
Year : 2018
Volume : 157
First Page : 837
Last Page : 851
Authors : Federico S, Margiotta E, Salmaso V, Pastorin G, Kachler S, Klotz KN, Moro S, Spalluto G.
Abstract : [1,2,4]Triazolo[1,5-c]pyrimidine is a promising platform to develop adenosine receptor antagonists. Here, we tried to investigate the effect of the substituent at the 8 position of [1,2,4]triazolo[1,5-c]pyrimidine derivatives on affinity and selectivity at the human A3 adenosine receptor subtype. In particular, we have introduced both esters and amides, principally with a benzylic nature. In addition, a small series of 5-substituted [1,2,4]triazolo[1,5-c]pyrimidines was designed in order to complete the structure-activity relationship analysis. Several of these new compounds showed affinity towards human A3 adenosine receptor in the low nanomolar range, with the most potent derivative of the series bringing a 4-ethylbenzylester at the 8 position (compound 18, hA3AR Ki = 1.21 nM). Docking studies performed on the synthesized compounds inside models of human A1, A2A and A3 adenosine receptors showed similar binding modes, comparable with the typical crystallographic binding mode of the inverse agonist ZM-241,385.
|
Antiviral activity determined as inhibition of SARS-CoV-2 induced cytotoxicity of Caco-2 cells at 10 uM after 48 hours by high content imaging
|
Homo sapiens
|
-5.44
%
|
|
Title : Identification of inhibitors of SARS-CoV-2 in-vitro cellular toxicity in human (Caco-2) cells using a large scale drug repurposing collection
Year : 2020
Authors : Bernhard Ellinger, Denisa Bojkova, Andrea Zaliani, Jindrich Cinatl, Carsten Claussen, Sandra Westhaus, Jeanette Reinshagen, Maria Kuzikov, Markus Wolf, Gerd Geisslinger, Philip Gribbon, Sandra Ciesek
Abstract : To identify possible candidates for progression towards clinical studies against SARS-CoV-2, we screened a well-defined collection of 5632 compounds including 3488 compounds which have undergone clinical investigations (marketed drugs, phases 1 -3, and withdrawn) across 600 indications. Compounds were screened for their inhibition of viral induced cytotoxicity using the human epithelial colorectal adenocarcinoma cell line Caco-2 and a SARS-CoV-2 isolate. The primary screen of 5632 compounds gave 271 hits. A total of 64 compounds with IC50 <20 µM were identified, including 19 compounds with IC50 < 1 µM. Of this confirmed hit population, 90% have not yet been previously reported as active against SARS-CoV-2 in-vitro cell assays. Some 37 of the actives are launched drugs, 19 are in phases 1-3 and 10 pre-clinical. Several inhibitors were associated with modulation of host pathways including kinase signaling P53 activation, ubiquitin pathways and PDE activity modulation, with long chain acyl transferases were effective viral inhibitors.
|
Partial agonist activity at recombinant human A3AR expressed in HEK293 cells assessed as inhibition of forskolin-stimulated cAMP accumulation measured after 30 mins in presence of A2BAR blocker PSB-603 by Glo-sensor assay
|
Homo sapiens
|
4.1
nM
|
|
Journal : J Med Chem
Title : Truncated (N)-Methanocarba Nucleosides as Partial Agonists at Mouse and Human A3 Adenosine Receptors: Affinity Enhancement by N6-(2-Phenylethyl) Substitution.
Year : 2020
Volume : 63
Issue : 8
First Page : 4334
Last Page : 4348
Authors : Tosh DK, Salmaso V, Rao H, Bitant A, Fisher CL, Lieberman DI, Vorbrüggen H, Reitman ML, Gavrilova O, Gao ZG, Auchampach JA, Jacobson KA.
Abstract : Dopamine-derived N6-substituents, compared to N6-(2-phenylethyl), in truncated (N)-methanocarba (bicyclo[3.1.0]hexyl) adenosines favored high A3 adenosine receptor (AR) affinity/selectivity, e.g., C2-phenylethynyl analogue 15 (MRS7591, Ki = 10.9/17.8 nM, at human/mouse A3AR). 15 was a partial agonist in vitro (hA3AR, cAMP inhibition, 31% Emax; mA3AR, [35S]GTP-γ-S binding, 16% Emax) and in vivo and also antagonized hA3AR in vitro. Distal H-bonding substitutions of the N6-(2-phenylethyl) moiety particularly enhanced mA3AR affinity by polar interactions with the extracellular loops, predicted using docking and molecular dynamics simulation with newly constructed mA3AR and hA3AR homology models. These hybrid models were based on an inactive antagonist-bound hA1AR structure for the upper part of TM2 and an agonist-bound hA2AAR structure for the remaining TM portions. These species-independent A3AR-selective nucleosides are low efficacy partial agonists and novel, nuanced modulators of the A3AR, a drug target of growing interest.
|
SARS-CoV-2 3CL-Pro protease inhibition percentage at 20µM by FRET kind of response from peptide substrate
|
Severe acute respiratory syndrome coronavirus 2
|
11.8
%
|
|
SARS-CoV-2 3CL-Pro protease inhibition percentage at 20µM by FRET kind of response from peptide substrate
|
Severe acute respiratory syndrome coronavirus 2
|
22.49
%
|
|
Title : Identification of inhibitors of SARS-Cov2 M-Pro enzymatic activity using a small molecule repurposing screen
Year : 2020
Authors : Maria Kuzikov, Elisa Costanzi, Jeanette Reinshagen, Francesca Esposito, Laura Vangeel, Markus Wolf, Bernhard Ellinger, Carsten Claussen, Gerd Geisslinger, Angela Corona, Daniela Iaconis, Carmine Talarico, Candida Manelfi, Rolando Cannalire, Giulia Rossetti, Jonas Gossen, Simone Albani, Francesco Musiani, Katja Herzog, Yang Ye, Barbara Giabbai, Nicola Demitri, Dirk Jochmans, Steven De Jonghe, Jasper Rymenants, Vincenzo Summa, Enzo Tramontano, Andrea R. Beccari, Pieter Leyssen, Paola Storici, Johan Neyts, Philip Gribbon, and Andrea Zaliani
Abstract : Compound repurposing is an important strategy being pursued in the identification of effective treatment against the SARS-CoV-2 infection and COVID-19 disease. In this regard, SARS-CoV-2 main protease (M-Pro), also termed 3CL-Pro, is an attractive drug target as it plays a central role in viral replication by processing the viral polyprotein into 11 non-structural proteins. We report the results of a screening campaign involving ca 8.7 K compounds containing marketed drugs, clinical and preclinical candidates, and chemicals regarded as safe in humans. We confirmed previously reported inhibitors of 3CL-Pro, but we have also identified 68 compounds with IC50 lower than 1 uM and 127 compounds with IC50 lower than 5 uM. Profiling showed 67% of confirmed hits were selective (> 5 fold) against other Cys- and Ser- proteases (Chymotrypsin and Cathepsin-L) and MERS 3CL-Pro. Selected compounds were also analysed in their binding characteristics.
|
Antiviral activity determined as inhibition of SARS-CoV-2 induced cytotoxicity of VERO-6 cells at 10 uM after 48 hours exposure to 0.01 MOI SARS CoV-2 virus by high content imaging
|
Chlorocebus sabaeus
|
0.03
%
|
|
Antiviral activity determined as inhibition of SARS-CoV-2 induced cytotoxicity of VERO-6 cells at 10 uM after 48 hours exposure to 0.01 MOI SARS CoV-2 virus by high content imaging
|
Chlorocebus sabaeus
|
-0.27
%
|
|
Antiviral activity determined as inhibition of SARS-CoV-2 induced cytotoxicity of VERO-6 cells at 10 uM after 48 hours exposure to 0.01 MOI SARS CoV-2 virus by high content imaging
|
Chlorocebus sabaeus
|
-0.27
%
|
|
Antiviral activity determined as inhibition of SARS-CoV-2 induced cytotoxicity of VERO-6 cells at 10 uM after 48 hours exposure to 0.01 MOI SARS CoV-2 virus by high content imaging
|
Chlorocebus sabaeus
|
0.03
%
|
|
Title : Cytopathic SARS-Cov2 screening on VERO-E6 cells in a large repurposing effort
Year : 2020
Authors : Andrea Zaliani, Laura Vangeel, Jeanette Reinshagen, Daniela Iaconis, Maria Kuzikov, Oliver Keminer, Markus Wolf, Bernhard Ellinger, Francesca Esposito, Angela Corona, Enzo Tramontano, Candida Manelfi, Katja Herzog, Dirk Jochmans, Steven De Jonghe, Winston Chiu, Thibault Francken, Joost Schepers, Caroline Collard, Kayvan Abbasi, Carsten Claussen , Vincenzo Summa, Andrea R. Beccari, Johan Neyts, Philip Gribbon and Pieter Leyssen
Abstract : Worldwide, there are intensive efforts to identify repurposed drugs as potential therapies against SARS-CoV-2 infection and the associated COVID-19 disease. To date, the anti-inflammatory drug dexamethasone and (to a lesser extent) the RNA-polymerase inhibitor remdesivir have been shown to be effective in reducing mortality and patient time to recovery, respectively, in patients. Here, we report the results of a phenotypic screening campaign within an EU-funded project (H2020-EXSCALATE4COV) aimed at extending the repertoire of anti-COVID therapeutics through repurposing of available compounds and highlighting compounds with new mechanisms of action against viral infection. We screened 8702 molecules from different repurposing libraries, to reveal 110 compounds with an anti-cytopathic IC50 < 20 µM. From this group, 18 with a safety index greater than 2 are also marketed drugs, making them suitable for further study as potential therapies against COVID-19. Our result supports the idea that a systematic approach to repurposing is a valid strategy to accelerate the necessary drug discovery process.
|
Competitive binding affinity to GST-tagged human PPARdelta LBD incubated for 1 to 6 hrs by TR-FRET assay
|
Homo sapiens
|
191.0
nM
|
|
Journal : Bioorg Med Chem
Title : Selenium bioisosteric replacement of adenosine derivatives promoting adiponectin secretion increases the binding affinity to peroxisome proliferator-activated receptor δ.
Year : 2020
Volume : 28
Issue : 1
First Page : 115226
Last Page : 115226
Authors : An S, Yu J, Choi H, Ko H, Ahn S, Shin JC, Pyo JJ, Jeong LS, Noh M.
Abstract : N<sup>6</sup>-(3-Iodobenzyl)adenosine-5'-N-methyluronamide (1a, IB-MECA) exhibited polypharmacological characteristics targeting A<sub>3</sub> adenosine receptor (AR), peroxisome proliferator-activated receptor (PPAR) γ, and PPARδ, simultaneously. The bioisosteric replacement of oxygen in 4'-oxoadenosines with selenium significantly increased the PPARδ-binding activity. 2-Chloro-N<sup>6</sup>-(3-iodobenzyl)-4'-selenoadenosine-5'-N-methyluronamide (3e) and related 4'-selenoadenosine derivatives significantly enhanced adiponectin biosynthesis during adipogenesis in human bone marrow mesenchymal stem cells (hBM-MSCs). The PPARδ-binding affinity, but not the A<sub>3</sub> AR binding affinity, of 4'-selenoadenosine derivatives correlated with their adiponectin secretion stimulation. Compared with the sugar ring of 4'-oxoadenosine, that of 4'-selenoadenosine was more favorable in forming the South sugar conformation. In the molecular docking simulation, the South sugar conformation of compound 3e formed additional hydrogen bonds inside the PPARδ ligand-binding pocket compared with the North conformation. Therefore, the sugar conformation of 4'-selenoadenosine PPAR modulators affects the ligand binding affinity against PPARδ.
|
Binding affinity to human A3AR assessed as inhibitor constant
|
Homo sapiens
|
1.4
nM
|
|
Journal : ACS Med Chem Lett
Title : Direct Comparison of (N)-Methanocarba and Ribose-Containing 2-Arylalkynyladenosine Derivatives as A Receptor Agonists.
Year : 2020
Volume : 11
Issue : 10
First Page : 1935
Last Page : 1941
Authors : Tosh DK,Salmaso V,Rao H,Campbell R,Bitant A,Gao ZG,Auchampach JA,Jacobson KA
Abstract : A side-by-side pharmacological comparison of ribose and (N)-methanocarba (bicyclo[3.1.0]hexane) nucleosides as AAR agonists indicated that the bicyclic pseudoribose ring constraint provided higher affinity/selectivity at human and mouse AAR. The mean affinity enhancement for 5 pairs of 5'-methylamides was 11-fold at hAAR and 42-fold at mAAR. Novel C2-(5-fluorothien-2-ylethynyl) substitution enhanced affinity in the methanocarba but not ribose series, with highly hAAR-selective 16 (MRS7334) displaying K 280 pM and favorable pharmacokinetics and off-target activity profile. Molecular dynamics comparison of 16 and its corresponding riboside 8 suggested a qualitative entropic advantage of 16 in hAAR binding. The 5-F substitution tended to increase hAAR affinity (cf. 5-Cl) for methanocarba but not ribose derivatives. A representative methanocarba agonist 4 was shown to interact potently exclusively with AAR, among 240 GPCRs and 466 kinases. Thus, despite added synthetic difficulty, the (N)-methanocarba modification has distinct advantages for AAR agonists, which have translational potential for chronic disease treatment.
|
Agonist activity at human A3 adenosine receptor expressed in CHO cells assessed as inhibition of forskolin stimulated cAMP formation incubated for 45 mins followed by forskolin stimulation and measured after 15 mins by liquid scintillation spectrometry analysis
|
Homo sapiens
|
1.21
nM
|
|
