Indole metabolites were separated by thin-layer chromatography following organ culture of rat pineal glands with tritiated tryptophan. Methoxyindole production was shown to differ substantially from results obtained when pineal glands were incubated with radiolabelled serotonin. The correlation between hydroxy- and corresponding methoxyindoles was, however, remarkably similar to previous results, and indicated that in the pineal gland, it is probable that production of methoxyindoles is dependent on the concentration of the various hydroxyindoles and their relative affinities for hydroxyindole-O-methyltransferase. It is also probable that although several forms of the enzyme may exist in the pineal gland, the catalytic sites are homogeneous in their activity.
J. Endocr. (1987) 115, 455–458
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