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An inhibitory role for brain serotonin-containing systems in the locomotor effects of d-amphetamine

AS Hollister, GR Breese, CM Kuhn, BR Cooper and SM Schanberg

Locomotor activity induced by d-amphetamine was found to be potentiated by food deprivation, a tryptophan-free diet, p-chlorophenylalanine and drugs proposed to antagonize serotonin receptors in brain. Administration of L-tryptophan 1 hour prior to d-amphetamine injection was found to antagonize the enhanced response to d-amphetamine in starved rats and in rats which had tryptophan removed from their diet. However, tryptophan did not block the potentiated response to d- amphetamine in animals pretreated with p-chlorophenylalanine. These findings suggested that the antagonism of d-amphetamine-induced activity by tryptophan in starved rats and rats fed a tryptophan-free diet was not due to a nonspecific depressant effect of the amino acid. Since accumulation of d-amphetamine and its metabolites was not affected by any of the treatments which enhanced its activity, it seems unlikely that an alteration in the metabolism of d-amphetamine can explain these findings. The present work provides additional support for the view that serotonergic fibers play an important role in the actions of d-amphetamine.

Volume 198, Issue 1, pp. 12-22, 07/01/1976
Copyright © 1976 by American Society for Pharmacology and Experimental Therapeutics




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Copyright © 1976 by the American Society for Pharmacology and Experimental Therapeutics.