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Arc controls alcohol cue relapse by a central amygdala mechanism

Roberto Pagano1, Ahmad Salamian1, Janusz Zielinski2

  • 1Laboratory of Molecular Basis of Behavior, Nencki Institute of Experimental Biology of Polish Academy of Sciences, Warsaw, Poland.

Molecular Psychiatry
|November 10, 2022
PubMed

Insights

Researchers identified a key brain mechanism involving the activity-regulated cytoskeleton-associated protein (Arc) that controls alcohol relapse. Targeting Arc may offer new strategies for preventing relapse in alcohol use disorder (AUD).

Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Alcohol use disorder (AUD) is a chronic, fatal disease with a high relapse rate, hindering effective treatment.
  • The molecular underpinnings of cue-induced relapse in AUD remain poorly understood, limiting the development of targeted therapies.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying cue-induced alcohol relapse in AUD.
  • To identify novel therapeutic targets for preventing relapse in AUD patients.

Main Methods:

  • Utilized a comprehensive animal model of AUD.
  • Employed virally-mediated, amygdala-targeted genetic manipulation using CRISPR/Cas9 technology.
  • Conducted ex vivo electrophysiology and analyzed human genetic data (SNPs and methylation in the ARC gene).

Main Results:

  • Identified a mechanism involving activity-regulated cytoskeleton-associated protein (Arc)/ARG3.1-dependent plasticity of amygdala synapses that controls cue-induced alcohol relapse.
  • Demonstrated that genetic variations and methylation in the ARC gene predict amygdala size and alcohol consumption frequency in humans.
  • Showed that targeting Arc during alcohol cue exposure can selectively prevent relapse.

Conclusions:

  • The Arc protein and amygdala synaptic plasticity play a critical role in regulating alcohol relapse.
  • ARC gene variations and epigenetic modifications are linked to AUD severity and brain structure.
  • Targeting Arc represents a promising novel strategy for AUD relapse prevention.

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