Synthesis, nicotinic acetylcholine receptor binding, in vitro and in vivo pharmacology properties of 3'-(substituted pyridinyl)-deschloroepibatidine analogs.

ABSTRACT: Over the last several years we have synthesized and studied the in vitro and in vivo nAChR pharmacological properties of epibatidine (4) analogs. In this study we report the synthesis, nAChR in vitro and in vivo pharmacological properties of 3'-(substituted pyridinyl)-deschloroepibatidine analogs (5a-e and 6a-e). All of the analogs had high binding affinity for ?4?2(?)-nAChRs. Several of the analogs were potent antagonists of ?4?2-nAChRs in in vitro efficacy tests and were potent antagonists of nicotine-induced antinociception in the mouse tail-flick test. Compound 6b had a Ki = 0.13 nM in the binding assay, 25- and 46-fold selectivity for the ?4?2(?)-nAChR relative to the ?3?4- and ?7-nAChR, respectively, in the in vitro efficacy test and an AD50 = 0.13 ?g/kg in the tail-flick test. Combined with favorable calculated physiochemical properties compared to varenicline, our findings suggest that 6b should be considered for development as a potential pharmacotherapy for treating nicotine addiction and other CNS disorders.

SUBMITTER: Ondachi PW 

PROVIDER: S-EPMC4554999 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature