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D. Grahame-Smith (1971)
STUDIES IN VIVO ON THE RELATIONSHIP BETWEEN BRAIN TRYPTOPHAN, BRAIN 5‐HT SYNTHESIS AND HYPERACTIVITY IN RATS TREATED WITH A MONOAMINE OXIDASE INHIBITOR AND L‐TRYPTOPHANJournal of Neurochemistry, 18
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1 The effects on tryptophan distribution and metabolism of drugs altering plasma unesterified fatty acid (UFA) concentration were investigated in the rat. 2 UFA and plasma free (i.e. ultrafilterable) tryptophan altered in the same direction. 3 Catecholamines and l‐DOPA increased both plasma UFA and free tryptophan. l‐DOPA also increased brain tryptophan and 5‐hydroxyindoleacetic acid (5‐HIAA) but decreased brain 5‐hydroxytryptamine (5‐HT). 4 Aminophylline increased plasma UFA and free tryptophan and also brain tryptophan, 5‐HT and 5‐HIAA. Food deprivation had qualitatively similar effects. 5 Insulin decreased plasma UFA and free tryptophan in both fed and food‐deprived rats. However, while in fed rats these changes were associated with small decreases of brain indoles, in food‐deprived animals small increases occurred. 6 Nicotinic acid had only small effects in fed rats but it opposed both the UFA and indole changes in food‐deprived animals. Total plasma tryptophan increased in nicotinic acid treated, food‐deprived rats. 7 There was a tendency towards inverse relations between changes of plasma free and total tryptophan. 8 The results suggest that drugs which influence plasma UFA through actions on cyclic AMP thereby alter the binding of tryptophan to plasma protein and that this leads to altered distribution and metabolism of tryptophan.
British Journal of Pharmacology – Wiley
Published: Feb 1, 1974
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