Corticotropin releasing factor signaling in the central amygdala is recruited during binge-like ethanol consumption in C57BL/6J mice

TitleCorticotropin releasing factor signaling in the central amygdala is recruited during binge-like ethanol consumption in C57BL/6J mice
Publication TypeJournal Article
Year of Publication2012
AuthorsLowery-Gionta EG, Navarro M, Li C, Pleil KE, Rinker JA, Cox BR, Sprow GM, Kash TL, Thiele TE
JournalJ Neurosci
Volume32
Issue10
Pagination3405-13
Date Published2012 Mar 07
ISSN1529-2401
KeywordsAlcohol Drinking, Amygdala, Animals, Corticotropin-Releasing Hormone, Ethanol, Male, Mice, Mice, Inbred C57BL, Signal Transduction
Abstract

A well established body of work indicates a crucial role for corticotropin-releasing factor (CRF) in neurobiological responses associated with excessive dependence-like ethanol drinking in ethanol-vapor-exposed rodents. Recent evidence demonstrates a role for CRF in the modulation of binge-like ethanol consumption by nondependent mice, a behavior that can precede ethanol dependence. The CRF circuitry that is engaged by binge-like ethanol exposure, however, is unknown. Using converging approaches, we provide evidence that, similar to ethanol-vapor-induced increases in ethanol intake, CRF signaling in the central nucleus of the amygdala (CeA) is engaged during binge-like ethanol consumption by C57BL/6J mice. Specifically, we found that binge-like consumption of an ethanol solution (20% ethanol v/v) was attenuated by pretreatment with the CRF1R antagonists antalarmin, 4-ethyl-[2,5,6-trimethyl-7-(2,4,6-trimethylphenyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl]amino-1-butanol, and NBI-27914 at doses (30 mg/kg, i.p.) that did not alter nonbinge-like ethanol consumption. Binge-like ethanol consumption resulted in significant increases of CRF immunoreactivity in the CeA immediately following ethanol drinking and 18-24 h following ethanol removal and also blocked the ability of CRF to enhance GABAergic transmission in the CeA 18-24 h following ethanol removal. Pretreatment with bilateral injections of antalarmin (1 μg/0.5 μl per side) into the CeA, but not the adjacent basolateral amygdala, significantly attenuated binge-like ethanol consumption. These findings suggest that CRF signaling in the CeA is recruited during excessive ethanol intake, before the development of dependence. We hypothesize that plastic changes in CRF signaling develop with repeated binge-like drinking episodes, contributing to the transition to dependence.

DOI10.1523/JNEUROSCI.6256-11.2012
Alternate JournalJ Neurosci
PubMed ID22399763
PubMed Central IDPMC3307528
Grant ListF31 AA017803 / AA / NIAAA NIH HHS / United States
U01 AA020911 / AA / NIAAA NIH HHS / United States
AA019454 / AA / NIAAA NIH HHS / United States
R01 AA013573-09 / AA / NIAAA NIH HHS / United States
K99 AA017668 / AA / NIAAA NIH HHS / United States
R37 AA013573 / AA / NIAAA NIH HHS / United States
AA017818 / AA / NIAAA NIH HHS / United States
R01 AA013573-08 / AA / NIAAA NIH HHS / United States
F31 AA017803-03 / AA / NIAAA NIH HHS / United States
AA017668 / AA / NIAAA NIH HHS / United States
F31 AA019839-03 / AA / NIAAA NIH HHS / United States
AA017803 / AA / NIAAA NIH HHS / United States
R01 AA019454 / AA / NIAAA NIH HHS / United States
R01 AA015148 / AA / NIAAA NIH HHS / United States
AA015148 / AA / NIAAA NIH HHS / United States
F31 AA019839 / AA / NIAAA NIH HHS / United States
R00 AA017668-04 / AA / NIAAA NIH HHS / United States
R01 AA015148-06 / AA / NIAAA NIH HHS / United States
F31 AA017818 / AA / NIAAA NIH HHS / United States
R00 AA017668 / AA / NIAAA NIH HHS / United States
R01 AA013573 / AA / NIAAA NIH HHS / United States
R01 AA019454-03 / AA / NIAAA NIH HHS / United States
AA019839 / AA / NIAAA NIH HHS / United States
AA013573 / AA / NIAAA NIH HHS / United States
R01 AA015148-07 / AA / NIAAA NIH HHS / United States