Discovery of aryl-biphenyl-2-ylmethylpiperazines as novel scaffolds for 5-HT7 ligands and role of the aromatic substituents in binding to the target receptor |
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Authors: | Youngjae Kim Jeeyeon Kim Jinsung Tae Bryan L. Roth Hyewhon Rhim Gyochang Keum Ghilsoo Nam Hyunah Choo |
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Affiliation: | 1. Center for Neuro-Medicine, Korea Institute of Science and Technology, Seongbuk-gu, Hwarangro 14-gil-5, Seoul 136-791, Republic of Korea;2. Department of Biological Chemistry, University of Science and Technology, Gajungro 217, Youseong-gu, Daejeon 305-350, Republic of Korea;3. Department of Chemistry, Yonsei University, Seodaemun-gu, Seoul 120-749, Republic of Korea;4. National Institute of Mental Health Psychoactive Drug Screening Program, Division of Medicinal Chemistry and Natural Products, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States;5. Department of Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States;6. Center for Neuroscience, Korea Institute of Science and Technology, Seongbuk-gu, Seoul 136-791, Republic of Korea |
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Abstract: | It has been reported that 5-HT7 receptors are promising targets of depression and neuropathic pain. 5-HT7 receptor antagonists have exhibited antidepressant-like profiles, while agonists have represented potential therapeutics for pain. In the course of our ongoing efforts to discover novel 5-HT7 modulators, we designed an arylpiperazine scaffold with a substituted biphenyl-2-ylmethyl group. A series of biphenyl-2-yl-arylpiperazinylmethanes were then prepared, which showed a broad spectrum of binding affinities to the 5-HT7 receptor depending upon the substituents attached to the biphenyl and aryl functionalities. Among those synthesized compounds, the compounds 1–24 and 1–26 showed the best binding affinities to the 5-HT7 receptor with Ki values of 43.0 and 46.0 nM, respectively. Structure–activity relationship study in conjunction with molecular docking study proposed that the 5-HT7 receptor might have two distinctive hydrophobic binding sites, one specific for aromatic 2-OCH3 substituents within the arylpiperazine and the other for biphenyl methoxy group. |
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