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INTERFERON-REGULATORY FACTOR 7: A NEUROIMMUNE ROLE FOR VAPOR-INDUCED ESCALATIONS IN ETHANOL SELF-ADMINISTRATION.

Dennis F Lovelock1, Joseph M Carew1, Elizabeth M McNair1

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Summary

Chronic ethanol exposure increases Interferon regulatory factor 7 (IRF7) in the brain, driving escalated alcohol drinking. Reducing IRF7 in the anterior insular cortex (aIC) can prevent this alcohol-related neuroadaptation.

Keywords:
Interferon-regulatory factor 7chronic intermittent ethanol exposureself-administration

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Area of Science:

  • Neuroscience
  • Neuroimmunology
  • Molecular Biology

Background:

  • Neuroimmune signaling is elevated in alcohol use disorder (AUD) and contributes to persistent alcohol-related neuroadaptations.
  • Interferon regulatory factor 7 (IRF7) is implicated in alcohol-relevant brain regions and may drive escalated drinking.

Purpose of the Study:

  • To investigate if chronic intermittent ethanol (CIE) exposure activates IRF7 signaling during alcohol self-administration.
  • To determine the association between IRF7 signaling and altered excitatory/inhibitory (E/I) balance in the anterior insular cortex (aIC) and its projections to the nucleus accumbens.

Main Methods:

  • Rats underwent CIE exposure and alcohol self-administration.
  • IRF7 levels were measured, alongside molecular and immunofluorescence analyses of E/I balance in the aIC.
  • Electrophysiological recordings assessed functional E/I balance in aIC neurons projecting to the nucleus accumbens.
  • IRF7 knockdown in the aIC was performed to assess its role.

Main Results:

  • CIE exposure increased alcohol self-administration, which correlated with higher IRF7 levels in the aIC and nucleus accumbens.
  • CIE shifted aIC E/I balance toward reduced excitation and decreased functional E/I balance in aIC→nucleus accumbens projections.
  • IRF7 knockdown in the aIC attenuated CIE-induced escalation of alcohol self-administration.

Conclusions:

  • IRF7 signaling in the anterior insular cortex plays a critical role in alcohol-related neuroadaptations that promote escalated drinking.
  • Targeting IRF7 in the aIC may offer a therapeutic strategy for AUD.