Pharmacologically counteracting a phenotypic difference in cerebellar GABAA receptor response to alcohol prevents excessive alcohol consumption in a high alcohol-consuming rodent genotype

Josh Steven Kaplan, Michelle A. Nipper, Ben D. Richardson, Jeremiah Jensen, Melinda Helms, Deborah Ann Finn, David James Rossi

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Cerebellar granule cell GABAA receptor responses to alcohol vary as a function of alcohol consumption phenotype, representing a potential neural mechanism for genetic predilection for alcohol abuse (Kaplan et al., 2013; Mohr et al., 2013). However, there are numerous molecular targets of alcohol in the cerebellum, and it is not known how they interact to affect cerebellar processing during consumption of socially relevant amounts of alcohol. Importantly, direct evidence for a causative role of the cerebellum in alcohol consumption phenotype is lacking. Here we determined that concentrations of alcohol that would be achieved in the blood after consumption of 1-2 standard units (9 mM) suppresses transmission through the cerebellar cortex in low, but not high, alcohol consuming rodent genotypes (DBA/2J and C57BL/6J mice, respectively). This genotype-selective suppression is mediated exclusively by enhancement of granule cell GABAA receptor currents, which only occurs in DBA/2J mice. Simulating the DBA/2J cellular phenotype in C57BL/6J mice by infusing the GABAA receptor agonist, 4,5,6,7-tetrahydroisoxazolo-[5,4-c]pyridine-3-ol hydrochloride, into cerebellar lobules IV-VI, in vivo, significantly reduced their alcohol consumption and blood alcohol concentrations achieved. 4,5,6,7-Tetrahydroisoxazolo- [5,4-c]pyridine-3-ol hydrochloride infusions also significantly decreased sucrose consumption, but they did not affect consumption of water or general locomotion. Thus, genetic differences in cerebellar response to alcohol contributes to alcohol consumption phenotype, and targeting the cerebellar GABAA receptor system may be a clinically viable therapeutic strategy for reducing excessive alcohol consumption.

Original languageEnglish (US)
Pages (from-to)9019-9025
Number of pages7
JournalJournal of Neuroscience
Volume36
Issue number35
DOIs
StatePublished - Aug 31 2016

Keywords

  • Addiction
  • Alcohol
  • Cerebellum
  • GABA
  • THIP

ASJC Scopus subject areas

  • Neuroscience(all)

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