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Theanine-induced reduction of brain serotonin concentration in rats
H Yokogoshi1, M Mochizuki, K Saitoh
1Laboratory of Nutritional Biochemistry, School of Food and Nutritional Sciences, University of Shizuoka, Japan. yokogosi@fnsl.u-shizuoka-ken.ac.jp
Bioscience, Biotechnology, and Biochemistry
|June 6, 1998
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.