Journal
EUROPEAN JOURNAL OF PHARMACOLOGY
Volume 424, Issue 2, Pages 115-119Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0014-2999(01)01105-0
Keywords
tyrosine depletion; dopamine; amphetamine; cocaine
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Neurochemical studies show that a tyrosine-free amino acid mixture depletes brain tyrosine and decreases dopamine synthesis and release. Here, we tested whether such a mixture would reduce the behavioural effects of amphetamine and other psychostimulants. A tyrosine-free amino acid mixture decreased the behavioural activation induced by both D-amphetamine (2 mg/kg s.c.) and cocaine (2 mg/kg s.c.). In contrast, the activation induced by the dopamine agonist, apomorphine (0.75 and 5 mg/kg s.c.), or the 5-hydroxytryptamine releasing agent, p-chloroamphetamine (2 mg/ka s.c.) was not altered. These findings provide behavioural evidence that tyrosine-free amino acid mixtures reduce presynaptic dopamine function in the brain. (C) 2001 Elsevier Science B.V. All rights reserved.
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