Theanine-induced reduction of brain serotonin concentration in rats.

Biosci Biotechnol Biochem

Laboratory of Nutritional Biochemistry, School of Food and Nutritional Sciences, University of Shizuoka, Japan.

Published: April 1998

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Article Abstract

Following the administration of theanine, the brain tryptophan content significantly increased or tended to increase, but the contents of serotonin and 5-hydroxyindole acetic acid (5HIAA) decreased. The use of inhibitors of serotonin metabolism enable us to speculate that theanine reduced serotonin synthesis and also increased serotonin degradation in the brain.

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http://dx.doi.org/10.1271/bbb.62.816DOI Listing

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