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Related Experiment Videos

Cognitive function and nigrostriatal markers in abstinent methamphetamine abusers.

Chris-Ellyn Johanson1, Kirk A Frey, Leslie H Lundahl

  • 1Department of Psychiatry and Behavioral Neurosciences, Wayne State University, Detroit, MI 48207, USA. cjohans@med.wayne.edu

Psychopharmacology
|March 7, 2006
PubMed
Summary

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Chronic methamphetamine (MA) users showed reduced dopamine transporters (DAT) and vesicular monoamine transporter type-2 (VMAT2) in the striatum. Cognitive and motor functions were largely preserved after abstinence, suggesting limited long-term deficits.

Area of Science:

  • Neuroscience
  • Neuroimaging
  • Addiction Research

Background:

  • Preclinical studies indicate methamphetamine (MA) causes long-term dopamine (DA) neuron changes in the striatum.
  • Human studies suggest similar effects, correlating with motor and cognitive deficits.

Purpose of the Study:

  • To investigate brain function changes in chronic, high-dose MA users after at least 3 months of abstinence.
  • To compare neuroimaging and cognitive assessments between abstinent MA users and controls.

Main Methods:

  • Positron emission tomography (PET) using [11C]methylphenidate and [11C]dihydrotetrabenazine to measure striatal DA transporter (DAT) and vesicular monoamine transporter type-2 (VMAT2) levels.
  • Comprehensive cognitive assessment including motor function, memory, learning, attention, and executive function.

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Main Results:

  • Abstinent MA users exhibited approximately 15% lower striatal DAT and 10% lower VMAT2 compared to controls.
  • MA users performed within the normal range on cognitive tasks but showed poorer performance on 3 of 12 tests compared to controls.

Conclusions:

  • Reduced transporter levels and neurocognitive function may be influenced by abstinence duration (mean 3 years), though no direct correlation was found.
  • Persistent VMAT2 reductions support MA's neurotoxic effects on nigrostriatal terminals.
  • The observed effects on nigrostriatal integrity are minor, questioning the likelihood of developing clinical DA deficiency signs.