Hydroxyindole-O-methyltransferase (HIOMT) activity and the uptake of 3H-melatonin in the lamprey, Geotria australis gray

Jean M P Joss*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

HIOMT activity in the pineal complex of Geotria australis ammocoetes was found to reach a peak, 4-5-fold that of the basal value, between 2 and 3 hr after the onset of darkness. This short burst of HIOMT activity was associated with aggregation of pigment in the melanophores causing pallor in the ammocoetes. 3H-Melatonin was taken up by all the tissues examined (pineal complex, pituitary, endostyle, brain, liver, gut and tail muscle). It is concluded from these results that the pineal complex in Geotria australis is a photoneuroendocrine transducer conveying diurnal information to other body tissues.

Original languageEnglish
Pages (from-to)270-275
Number of pages6
JournalGeneral and Comparative Endocrinology
Volume31
Issue number3
DOIs
Publication statusPublished - 1977

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