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Sex differences in impulsivity and brain morphometry in methamphetamine users.

Shannon Kogachi1, Linda Chang2, Daniel Alicata1

  • 1Department of Medicine, John A. Burns School of Medicine, University of Hawaii and Queen's Medical Center, 1356 Lusitana Street, UH Tower, Room 716, Honolulu, HI, 96813, USA.

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|April 21, 2016
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Summary
This summary is machine-generated.

Methamphetamine use alters brain structure and impulsivity differently in men and women. Male users showed larger frontal cortex volumes linked to higher cognitive impulsivity, while females had smaller frontal cortices and larger nucleus accumbens.

Keywords:
Brain morphometryImpulsivityMethamphetamineSex differences

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Addiction Research

Background:

  • Methamphetamine (METH) is a potent stimulant associated with significant neurobiological alterations in users.
  • Impulsivity is a key characteristic of addiction, but its relationship with brain structure in METH users, considering sex differences, requires further investigation.

Purpose of the Study:

  • To investigate the relationship between impulsivity, brain structure, and sex-specific differences in individuals with a history of methamphetamine use compared to controls.
  • To examine how METH usage characteristics correlate with brain morphometry and impulsivity scores.

Main Methods:

  • Structural Magnetic Resonance Imaging (MRI) and the Barratt Impulsiveness Scale (BIS) were administered to 124 participants (62 METH users, 62 controls).
  • Statistical analyses evaluated independent and interactive effects of METH use status and sex on brain morphometry and impulsivity.

Main Results:

  • METH users exhibited significantly higher impulsivity scores on both cognitive and behavioral factors of the BIS.
  • Sex-specific differences in brain structure were observed: male METH users had larger right superior frontal cortex volumes, while female METH users had smaller volumes compared to same-sex controls.
  • Male METH users with larger frontal volumes and female METH users with smaller or thinner frontal cortices showed greater cognitive impulsivity. Female METH users uniquely displayed larger nucleus accumbens volumes.

Conclusions:

  • This study validates increased impulsivity and altered frontal cortex morphology in METH users, with significant sex-specific patterns.
  • In males, larger frontal volumes may relate to neurodevelopmental factors contributing to impulsivity and METH use. In females, smaller frontal cortices suggest neurotoxicity, while a larger nucleus accumbens may indicate an estrogen-mediated neuroprotective response.
  • Findings highlight distinct neurobiological impacts of METH use on male and female brains, underscoring the need for sex-tailored treatment approaches.