Circannual prolactin rhythms: calendar-like timer revealed in the pituitary gland

Research output: Contribution to journalShort surveypeer-review

15 Scopus citations


Although photoperiodic regulation of annual rhythms in reproduction and other functions has been well characterized, the basis for the endogenous generation of circannual rhythms during exposure to constant conditions has not been elucidated. Lincoln and colleagues have recently reported that circannual prolactin rhythms in rams persist after hypothalamo-pituitary disconnection, but not after pinealectomy. Does the pars tuberalis, the site of pituitary gland melatonin receptors, generate circannual rhythms and integrate photoperiodic signals mediated by melatonin?

Original languageEnglish
Pages (from-to)259-260
Number of pages2
JournalTrends in Endocrinology and Metabolism
Issue number7
StatePublished - Sep 2007

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology


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