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Polysubstance use impacts brain structure through both general and specific effects. Both alcohol and marijuana use uniquely affect brain thickness, highlighting additive exposure effects in polysubstance users.

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Area of Science:

  • Neuroimaging
  • Substance Use Disorders
  • Genetics

Background:

  • Polysubstance use is prevalent, yet its neurobiological underpinnings are not fully understood.
  • Research has primarily focused on individual substance types, leaving the generalizability and specificity of effects unclear.
  • The interplay between genetic predisposition and environmental exposure in substance use-related brain alterations requires further investigation.

Purpose of the Study:

  • To investigate shared and unique associations between various substance uses and brain structure in young adults.
  • To differentiate the contributions of genetic predisposition and environmental exposure to these associations.
  • To elucidate the neurobiological impact of polysubstance use patterns.

Main Methods:

  • Cross-sectional family-based study utilizing Human Connectome Project data.
  • Magnetic resonance imaging (MRI) and self-reported substance use data from siblings and singletons.
  • Linear mixed-effect models and variance component analyses to assess substance use effects on brain structure, considering genetic and environmental factors.

Main Results:

  • Hazardous alcohol use was negatively associated with global brain thickness, explaining other regional associations.
  • Marijuana use uniquely contributed to reduced global brain thickness beyond alcohol's effect.
  • Both alcohol and marijuana exhibited unique exposure effects on global brain thickness; marijuana also showed a predispositional effect.

Conclusions:

  • Brain structure alterations linked to substance use encompass both general and specific effects.
  • Findings indicate that predispositional and exposure-related factors contribute to these neurobiological changes.
  • The detrimental effects of polysubstance use may result from the cumulative impact of multiple unique substance exposures.