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Promoting activity of (?4)3(?2)2 nicotinic cholinergic receptors reduces ethanol consumption.

ABSTRACT: There is increasing interest in developing drugs that act at ?4?2 nicotinic acetylcholine receptors (nAChRs) to treat alcohol use disorder. The smoking cessation agent varenicline, a partial agonist of ?4?2 nAChRs, reduces alcohol intake, but its use can be limited by side effects at high therapeutic doses. There are two stoichiometric forms of ?4?2 nAChRs, (?4)3(?2)2 and (?4)2(?2)3. Here we investigated the hypothesis that NS9283, a positive allosteric modulator selective for the (?4)3(?2)2 form, reduces ethanol consumption. NS9283 increased the potency of varenicline to activate and desensitize (?4)3(?2)2 nAChRs in vitro without affecting other known targets of varenicline. In male and female C57BL/6J mice, NS9283 (10?mg/kg) reduced ethanol intake in a two-bottle choice, intermittent drinking procedure without affecting saccharin intake, ethanol-induced incoordination or ethanol-induced loss of the righting reflex. Subthreshold doses of NS9283 (2.5?mg/kg) plus varenicline (0.1?mg/kg) synergistically reduced ethanol intake in both sexes. Finally, despite having no aversive valence of its own, NS9283 enhanced ethanol-conditioned place aversion. We conclude that compounds targeting the (?4)3(?2)2 subtype of nAChRs can reduce alcohol consumption, and when administered in combination with varenicline, may allow use of lower varenicline doses to decrease varenicline side effects.

SUBMITTER: Wang J 

PROVIDER: S-EPMC6901472 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Promoting activity of (α4)<sub>3</sub>(β2)<sub>2</sub> nicotinic cholinergic receptors reduces ethanol consumption.

Wang Jingyi J   Blasio Angelo A   Chapman Holly L HL   Doebelin Christelle C   Liaw Victor V   Kuryatov Alexander A   Giovanetti Simone M SM   Lindstrom Jon J   Lin Li L   Cameron Michael D MD   Kamenecka Theodore M TM   Pomrenze Matthew B MB   Messing Robert O RO  

Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology 20190808 2

There is increasing interest in developing drugs that act at α4β2 nicotinic acetylcholine receptors (nAChRs) to treat alcohol use disorder. The smoking cessation agent varenicline, a partial agonist of α4β2 nAChRs, reduces alcohol intake, but its use can be limited by side effects at high therapeutic doses. There are two stoichiometric forms of α4β2 nAChRs, (α4)<sub>3</sub>(β2)<sub>2</sub> and (α4)<sub>2</sub>(β2)<sub>3</sub>. Here we investigated the hypothesis that NS9283, a positive allosteri  ...[more]

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