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Association between RMTg Neuropeptide Genes and Negative Effect during Alcohol Withdrawal in Mice.

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  • 1Department of Anatomy, School of Medicine, Sun Yat-Sen University, Shenzhen 518106, China.

International Journal of Molecular Sciences
|March 13, 2024
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Summary

Stress neuropeptides in the RMTg influence alcohol use disorder (AUD) relapse by affecting negative emotions. Reduced Pnoc and Orx, and elevated Crf levels were observed during alcohol abstinence.

Keywords:
RMTgalcoholanxietydepressionneuropeptides

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Area of Science:

  • Neuroscience
  • Addiction Research
  • Molecular Psychiatry

Background:

  • Alcohol use disorders (AUDs) often co-occur with anxiety and depression, worsening relapse risk.
  • Stress-related neuropeptides modulate dopamine function, impacting AUD pathophysiology.
  • The rostromedial tegmental nucleus (RMTg) plays a role in aversion and negative emotional states during alcohol abstinence.

Purpose of the Study:

  • To investigate the role of stress-related neuropeptides in the RMTg during alcohol abstinence.
  • To examine changes in neuropeptide gene expression correlating with negative emotional behaviors post-ethanol (EtOH).

Main Methods:

  • Utilized an intermittent voluntary drinking model in mice to induce negative affect during EtOH abstinence.
  • Employed laser-capture microdissection and retrograde tracing to isolate specific neuronal populations.
  • Analyzed expression of pro-stress (Pnoc, Oxt, Npy) and anti-stress (Crf, Pomc, Avp, Orx, Pdyn) neuropeptide genes.

Main Results:

  • Mice exhibited anxiety, anhedonia, and depression-like symptoms 24 hours post-EtOH.
  • Post-EtOH abstinence reduced Pnoc and Orx levels while increasing Crf levels in VTA-projecting neurons and RMTg.
  • RMTg Pnoc and Npy levels correlated inversely with ethanol consumption and depression severity, while Crf levels correlated with anxiety.

Conclusions:

  • Stress-related neuropeptides within the RMTg are implicated in regulating negative emotions associated with AUDs.
  • Findings offer novel insights into the neurobiological mechanisms underlying alcohol relapse and mood disorders.
  • Targeting RMTg neuropeptides may represent a future therapeutic strategy for AUDs.