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Although it is well established that increases in tryptophan availability can increase brain serotonin synthesis, the effect of tryptophan loads on serotonin release is not as clear. We have used in vivo microdialysis in order to monitor extracellular serotonin in the lateral hypothalamus to examine this issue. Tryptophan methyl ester (100 mg/kg IP) was administered to ad lib-fed and 48-h food-deprived rats. The results suggest that a peripheral tryptophan load can elevate extracellular serotonin in food-deprived subjects more effectively than in food-replete subjects.
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