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Clinical Brain Disorders Branch, National Institute of Mental
Health, National Institutes of Health, Department of Health and Human
Services, Building 10, Center Drive, Room 4S-235, Bethesda, MD
20982-1379
Communicated by Erminio Costa, University of Illinois, Chicago,
IL, March 6, 2003 (received for review January 27, 2003)
Monamines subserve many critical roles in the brain, and
monoaminergic drugs such as amphetamine have a long history in the treatment of neuropsychiatric disorders and also as a substance of
abuse. The clinical effects of amphetamine are quite variable, from positive effects on mood and cognition in some individuals, to
negative responses in others, perhaps related to individual variations
in monaminergic function and monoamine system genes. We explored the
effect of a functional polymorphism
(val158-met) in the catechol
O-methyltransferase gene, which has been shown to modulate
prefrontal dopamine in animals and prefrontal cortical function in
humans, on the modulatory actions of amphetamine on the prefrontal
cortex. Amphetamine enhanced the efficiency of prefrontal cortex
function assayed with functional MRI during a working memory task in
subjects with the high enzyme activity val/val genotype, who presumably have
relatively less prefrontal synaptic dopamine, at all levels of task
difficulty. In contrast, in subjects with the low activity
met/met genotype who tend to have superior
baseline prefrontal function, the drug had no effect on cortical
efficiency at low-to-moderate working memory load and caused
deterioration at high working memory load. These data illustrate
an application of functional neuroimaging in pharmacogenomics and extend basic evidence of an inverted-"U" functional-response curve to increasing dopamine signaling in the prefrontal cortex. Further, individuals with the met/met
catechol O-methyltransferase genotype appear to be at
increased risk for an adverse response to amphetamine.
Neuroscience
Catechol O-methyltransferase
val158-met genotype and
individual variation in the brain response to amphetamine
*
To whom correspondence should be addressed. E-mail:
weinberd{at}intra.nimh.nih.gov.
www.pnas.org/cgi/doi/10.1073/pnas.0931309100
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