Rapid depletion of serum tryptophan, brain tryptophan, serotonin and 5-hydroxyindoleacetic acid by a tryptophan-free diet |
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Authors: | G Biggio F Fadda P Fanni A Tagliamonte G L Gessa |
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Affiliation: | Institutes of Pharmacology and Nutritional Physiology University of Cagliari, Italy |
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Abstract: | Rats were trained for 20 days to eat their normal daily meal in a period of 2 hours. On the twentyfirst day they received a diet in which tryptophan was omitted instead of the usual balanced diet. The ingestion of the tryptophan-free diet produced a marked depletion of free serum tryptophan (90%), brain tryptophan (85%), brain 5-HT (58%) and brain 5-HIAA (76%). These changes were almost maximal within 2 hours after food presentation and persisted for more than 24 hours. The mechanism of these changes is discussed. |
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