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Eur J Med Chem. 2019 Jun 7;178:433-445. doi: 10.1016/j.ejmech.2019.06.007. [Epub ahead of print]

Design, synthesis and biological evaluation of novel 2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole triazole derivatives as potent TRPV1 antagonists.

Author information

1
Institute for Innovative Drug Design and Evaluation, School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China.
2
State Key Laboratory of Natural Medicines, Center of Drug Discovery, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing, Jiangsu, 210009, China.
3
School of Pharmaceutical Sciences, South-Central University for Nationalities, 182 Minyuan Road, Wuhan, Hubei, 430074, China.
4
Institute for Innovative Drug Design and Evaluation, School of Pharmacy, Henan University, N. Jinming Ave., Kaifeng, Henan, 475004, China. Electronic address: yanlin0378@163.com.
5
State Key Laboratory of Natural Medicines, Center of Drug Discovery, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing, Jiangsu, 210009, China. Electronic address: qianhai24@163.com.

Abstract

Reported herein is the design, synthesis, and pharmacologic evaluation of a class of TRPV1 antagonists constructed on 2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole as A-region and triazole as B-region. The SAR analysis indicated that 2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole analogues displayed excellent antagonism of hTRPV1 activation by capsaicin and showed better potency compared to the corresponding dihydroindole analogues. Optimization of this design led to the eventual identification of 2-((1-(2-(trifluoromethyl)phenyl)-1H-1,2,3-triazol-4-yl)methyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (6g), a potent TRPV1 antagonist. In vitro, using cells expressing recombinant human TRPV1 channels, 6g displayed potent antagonism activated by capsaicin (IC50 = 0.075 μM) and only partially blocked acid activation of TRPV1. In vivo, 6g exhibited good efficacy in capsaicin-induced and heat-induced pain models and had almost no hyperthermia side-effect. Furthermore, pharmacokinetic studies revealed that compound 6g had a superior oral exposure after oral administration in rats. To understand its binding interactions with the receptor, the docking study of 6g was performed in rTRPV1 model and showed an excellent fit to the binding site. On the basis of its superior profiles, 6g could be considered as the lead candidate for the further development of antinociceptive drugs.

KEYWORDS:

1,2,3-Triazole; 2,3,4,9-Tetrahydro-1H-pyrido[3,4-b]indole; Analgesic; Hyperthermia; Transient receptor potential vanilloid type 1

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