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Brain structural changes in cannabis dependence: association with MAGL.

Peter Manza1, Kai Yuan2,3, Ehsan Shokri-Kojori2

  • 1National Institute on Alcoholism and Alcohol Abuse, National Institutes of Health, Bethesda, MD, USA. peter.manza@nih.gov.

Molecular Psychiatry
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Chronic cannabis use is linked to brain structure changes, particularly in the precuneus region. This study reveals how cannabis dependence affects white and gray matter integrity.

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Area of Science:

  • Neuroscience
  • Neuroimaging
  • Addiction Research

Background:

  • Rising cannabis use necessitates understanding its neurological impact.
  • Chronic cannabis use is poorly understood in relation to brain structural abnormalities.

Purpose of the Study:

  • To investigate white matter microstructural integrity and gray matter differences in individuals with cannabis dependence (CD).
  • To explore associations between gene expression patterns and cortical differences in CD.
  • To determine the causal and graded effects of cannabis on brain structure.

Main Methods:

  • Compared 89 individuals with CD to 89 matched controls using Human Connectome Project data.
  • Analyzed white matter fractional anisotropy and gray matter cortical thickness/density.
  • Examined gene expression of cannabinoid signaling pathway genes in postmortem brain tissue.

Main Results:

  • CD group showed reduced white matter fractional anisotropy in specific brain regions.
  • Individuals with CD exhibited significantly less gray matter thickness and density in the precuneus.
  • Higher monoacylglycerol lipase (MAGL) expression correlated with greater cortical thinning in CD.

Conclusions:

  • Chronic cannabis use is associated with significant white and gray matter structural differences, notably in the precuneus.
  • Cannabis dependence has causal and graded effects on precuneus structure.
  • Brain regions with high MAGL expression may be more susceptible to cannabis-induced cortical thinning.