Design, synthesis, and biological activity of N6-substituted-4'-thioadenosines at the human A3 adenosine receptor |
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Authors: | Jeong Lak Shin Lee Hyuk Woo Kim Hea Ok Jung Ji Young Gao Zhan-Guo Duong Heng T Rao Srikar Jacobson Kenneth A Shin Dae Hong Lee Jeong A Gunaga Prashantha Lee Sang Kook Jin Dong Zhe Chun Moon Woo Moon Hyung Ryong |
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Institution: | Laboratory of Medicinal Chemistry, College of Pharmacy, Ewha Womans University, Seoul 120-750, Republic of Korea. lakjeong@ewha.ac.kr |
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Abstract: | A large series of N6-substituted-4'-thioadenosines were synthesized starting from D-gulonic-gamma-lactone, and structure-activity relationships were studied at the human A3 and other subtypes of adenosine receptors (ARs). 2-Chloro-substituted and 2-H analogues were compared. 2-Chloro-N6-methyl-4'-thioadenosine 19b was a highly potent and selective agonist (Ki=0.8+/-0.1 nM in binding) at the A3AR, and displayed the same relative efficacy in receptor activation as a known full agonist, Cl-IB-MECA. Most of N6-substituted-4'-thioadenosines were less potent in binding than the corresponding N6-substituted-adenosines or N6-substituted-4'-thioadenosine-5'-uronamides. N6-(3-Iodobenzyl) derivative 19g was demonstrated to be an A3AR-selective partial agonist displaying a Ki value of 3.2 nM. |
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