Endocrinology, Vol 113, 1582-1586, Copyright © 1983 by Endocrine Society

ARTICLES

Reciprocal day/night relationship between serotonin oxidation and N- acetylation products in the rat pineal gland

IN Mefford, P Chang, DC Klein, MA Namboodiri, D Sugden and J Barchas

Pineal tryptophan, serotonin [5-hydroxytryptamine (5-HT)], N- acetylserotonin, melatonin, 5-hydroxyindoleacetic acid, 5- hydroxytryptophol, 5-methoxytryptophol, and 5-methoxyindoleacetic acid were measured by high pressure liquid chromatography with electrochemical detection. A complete analysis required less than the equivalent of two rat pineal glands. Samples were obtained at eight time points. A reciprocal physiological relationship was found between oxidation and N-acetylation products of 5-HT. 5-HT and the oxidation products 5-hydroxyindoleacetic acid, 5-hydroxytryptophol, 5- methoxytryptophol, and 5-methoxyindoleacetic acid decreased at night, when the N-acetylation products N-acetylserotonin and melatonin increased. These observations are consistent with the hypothesis that circadian changes in the N-acetylation of 5-HT by indoleamine N- acetyltransferase is the major factor controlling circadian changes in the amounts of 5-HT, and 5-HT oxidation and N-acetylation products in the rat pineal gland.

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