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Biology of Reproduction, Vol 10, 467-473, Copyright © 1974 by Society for the Study of Reproduction

HIOMT Activity in the Pineal Gland of the Female Rat: Effects of Light

JEROME M. YOCHIM 1, and EDWARD P. WALLEN 1

1 Department of Physiology and Cell Biology, University of Kansas, Lawrence, Kansas 66045


Rats placed into continuous darkness for 5 days maintained an "estrous cycle" pattern of HIOMT activity in the pineal gland, while exposure to continuous light for the same period of time abolished the pattern of HIOMT activity. Through the use of intermediate photoperiods, it was shown that the interaction of light and dark caused proportional changes in the mean rate of enzyme activity and specific changes in amplitude. By examining the effects of light on HIOMT activity in relation to specific terms of the mixed-wave equation the data demonstrated that the HIOMT rhythm in female rats is endogenous. A model of seasonal regulation of gonadotropin secretion by changes in pineal function is suggested.

Accepted on October 12, 1973






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Copyright © 1974 by the Society for the Study of Reproduction.