Circadian and seasonal control of neuroendocrine-gonadal activity

Fred W. Turek*, Susan Losee-Olson, Jennifer M. Swann, Kathleen Horwath, Eve Van Cauter, Jill J. Milette

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


A circadian clock(s) located in the suprachiasmatic nucleus (SCN) of the hypothalamus plays an important role in regulating the timing of pituitary gonadotropin release in many mammalian species. The results from studies involving two unusual experimental paradigms are presented to demonstrate a role for this circadian clock in the regulation of the timing of the preovulatory LH surge in the golden hamster as well as in the measurement of the seasonal change in day length in the Djungarian hamster; information which is used in the regulation of neuroendocrine-gonadal activity on a seasonal basis. The data also demonstrate that the circadian rhythm of locomotor activity can be used as a "marker" rhythm for the clock involved in both ovulatory and seasonal cycles in hamsters.

Original languageEnglish (US)
Pages (from-to)573-579
Number of pages7
JournalJournal of Steroid Biochemistry
Issue number1-3
StatePublished - 1987

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology

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