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MicroRNA-30a-5p in the prefrontal cortex controls the transition from moderate to excessive alcohol consumption

E Darcq1, V Warnault1, K Phamluong1

  • 1Department of Neurology, University of California, San Francisco, San Francisco, CA, USA.

Molecular Psychiatry
|October 22, 2014
PubMed

Insights

A specific microRNA, miR-30a-5p, drives excessive alcohol consumption by reducing brain-derived neurotrophic factor (BDNF) in the prefrontal cortex. Inhibiting miR-30a-5p reverses this effect, suggesting a novel therapeutic target for alcohol use disorder.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) regulate gene expression by degrading messenger RNA (mRNA) or inhibiting translation.
  • Brain-derived neurotrophic factor (BDNF) signaling in the prefrontal cortex (PFC) is crucial for moderating alcohol intake.
  • Dysregulation of the BDNF pathway is implicated in the transition from moderate to excessive alcohol consumption.

Purpose of the Study:

  • To investigate the role of miRNAs in the breakdown of the endogenous protective pathway against excessive alcohol intake.
  • To identify specific miRNAs involved in regulating BDNF expression in the medial PFC (mPFC) in response to alcohol exposure.
  • To determine if targeting specific miRNAs can modulate alcohol consumption behaviors.

Main Methods:

  • Utilized a mouse model mimicking human binge alcohol drinking patterns.
  • Measured BDNF mRNA levels and miRNA expression in the mPFC.
  • Assessed the direct interaction between miR-30a-5p and BDNF mRNA using 3' untranslated region (UTR) binding assays.
  • Manipulated miR-30a-5p levels in the mPFC via overexpression and inhibition (using Locked Nucleic Acid sequences).
  • Quantified changes in alcohol intake and preference in response to miRNA manipulation.

Main Results:

  • Binge alcohol drinking significantly reduced BDNF mRNA levels in the mPFC.
  • Expression of miR-30a-5p was significantly increased following binge alcohol exposure.
  • Overexpression of miR-30a-5p in the mPFC decreased BDNF expression and escalated alcohol intake.
  • Inhibition of miR-30a-5p restored BDNF levels and reduced excessive alcohol consumption.
  • miR-30a-5p was confirmed to bind to the 3' UTR of BDNF mRNA.

Conclusions:

  • miR-30a-5p plays a critical role in the transition from moderate to uncontrolled alcohol intake.
  • The breakdown of the BDNF protective pathway involves a miRNA-dependent mechanism mediated by miR-30a-5p.
  • Targeting miR-30a-5p in the mPFC presents a potential therapeutic strategy for managing alcohol use disorder.

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