Simultaneous determination of N-acetyltransferase activity, hydroxyindole-O-methyl-transferase activity, and melatonin content in the pineal gland of the Syrian hamster

S. Steinlechner, Thomas Champney, M. L. Houston, R. J. Reiter

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35 Scopus citations


The activities of serotonin N-acetyltransferase (NAT) and hydroxyindole-O-methyltransferase (HIOMT) and the melatonin content were measured in Syrian hamster pineal glands at 2-hr intervals over a period of 24 hr. NAT and HIOMT are the two enzymes which catalyze the formation of melatonin from serotonin. The use of micromethods for determination of the enzyme activities allowed concurrent measurement of NAT and melatonin or HIOMT and melatonin in the same gland. HIOMT activity showed no significant diurnal rhythm whereas NAT activity and melatonin content exhibited distinct peak values late in the dark phase as described previously. Despite an apparent parallelism between the NAT activity rhythm and melatonin content, no correlation exists between these parameters in single pineal glands.

Original languageEnglish
Pages (from-to)93-97
Number of pages5
JournalProceedings of the Society for Experimental Biology and Medicine
Issue number1
StatePublished - Jan 1 1984
Externally publishedYes


ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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