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Related Experiment Videos

Dopaminergic system dysfunction in recreational dexamphetamine users.

Anouk Schrantee1, Lena Václavů2, Dennis F R Heijtel2

  • 11] Department of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands [2] Brain Imaging Center, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
|November 15, 2014
PubMed
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This summary is machine-generated.

Recreational dexamphetamine (dAMPH) use impairs the brain's dopamine system, reducing receptor availability and function. This dysfunction is linked to blunted responses, highlighting risks of recreational dAMPH use.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Radiology

Background:

  • Dexamphetamine (dAMPH) is a stimulant used recreationally and for ADHD treatment.
  • Preclinical studies suggest dAMPH neurotoxicity on the dopaminergic system.
  • Limited data exists on dAMPH's effects on the human brain's dopamine system.

Purpose of the Study:

  • To investigate dopaminergic system alterations in recreational dAMPH users compared to controls.
  • To assess dAMPH's impact on dopamine D2/3 receptor availability, release, and function in humans.
  • To correlate subjective responses with physiological changes following dAMPH challenge.

Main Methods:

  • Study included recreational dAMPH users and matched dAMPH-naïve healthy controls.
  • Assessed D2/3 receptor availability using positron emission tomography (PET).

Related Experiment Videos

  • Measured dopamine release and functionality via PET and pharmacological MRI after dAMPH challenge.
  • Collected subjective responses to the dAMPH challenge.

    • Main Results:

    • Recreational dAMPH users showed significantly lower striatal DA D2/3 receptor binding than controls.
    • dAMPH users exhibited blunted dopamine release and functionality in response to acute dAMPH challenge.
    • Subjective responses to dAMPH were also blunted in recreational users.
    • Lower D2/3 receptor availability correlated with pleasantness in controls, but not in dAMPH users.

    Conclusions:

    • Recreational dAMPH use is associated with significant dopaminergic system dysfunction in humans.
    • Findings align with preclinical studies on dAMPH neurotoxicity.
    • Emphasizes caution regarding recreational dAMPH use and warrants further longitudinal research.