
Am J Psychiatry 158:377-382, March 2001
© 2001 American Psychiatric Association
Association of Dopamine Transporter Reduction With Psychomotor Impairment in Methamphetamine Abusers
Nora D. Volkow, M.D.,
Linda Chang, M.D.,
Gene-Jack Wang, M.D.,
Joanna S. Fowler, Ph.D.,
Maria Leonido-Yee, M.D.,
Dinko Franceschi, M.D.,
Mark J. Sedler, M.D.,
S. John Gatley, Ph.D.,
Robert Hitzemann, Ph.D.,
Yu-Shin Ding, Ph.D.,
Jean Logan, Ph.D.,
Christopher Wong, M.S., and
Eric N. Miller, Ph.D.
OBJECTIVE: Methamphetamine is a popular and highly addictive drug of abuse that has raised concerns because it has been shown in laboratory animals to be neurotoxic to dopamine terminals. The authors evaluated if similar changes occur in humans and assessed if they were functionally significant. METHOD: Positron emission tomography scans following administration of [11C]d-threo-methylphenidate (a dopamine transporter ligand) measured dopamine transporter levels (a marker of dopamine cell terminals) in the brains of 15 detoxified methamphetamine abusers and 18 comparison subjects. Neuropsychological tests were also performed to assess motor and cognitive function. RESULTS: Methamphetamine abusers showed significant dopamine transporter reduction in the striatum (mean differences of 27.8% in the caudate and 21.1% in the putamen) relative to the comparison subjects; this reduction was evident even in abusers who had been detoxified for at least 11 months. Dopamine transporter reduction was associated with motor slowing and memory impairment. CONCLUSIONS: These results provide evidence that methamphetamine at dose levels taken by human abusers of the drug leads to dopamine transporter reduction that is associated with motor and cognitive impairment. These results emphasize the urgency of alerting clinicians and the public of the long-term changes that methamphetamine can induce in the human brain.
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