Modulation of gonadotrophin-releasing hormone secretion by an endogenous circadian clock.

TitleModulation of gonadotrophin-releasing hormone secretion by an endogenous circadian clock.
Publication TypeJournal Article
Year of Publication2009
AuthorsChappell PE, Goodall CP, Tonsfeldt KJ, White RS, Bredeweg E, Latham KL
JournalJournal of neuroendocrinology
Volume21
Issue4
Pagination339-45
Date Published2009 Mar
ISSN1365-2826
KeywordsAnimals, Biological Clocks, Brain, Circadian Rhythm, Estradiol, Feedback, Physiological, Female, Gonadotropin-Releasing Hormone, Models, Biological, Neurons, Reproduction
Abstract

The mechanisms mediating positive feedback effects of oestradiol on pre-ovulatory gonadotrophin releasing-hormone (GnRH) surge generation in female mammals, although well-explored, are still incompletely understood. In addition to binding to and signalling through classical nuclear receptor-mediated pathways in afferent hypothalamic neurones, recent evidence suggests that ovarian steroids may use membrane-bound receptors or nonclassical signalling pathways to directly influence cell function leading to the generation of GnRH surge secretion. We review recent investigations into the role of the endogenous molecular circadian clock on modulation of GnRH gene expression and neuropeptide secretion, and will explore potential molecular mechanisms by which ovarian steroids may directly induce secretory changes at the level of the GnRH neurone, examining closely whether circadian clock gene oscillations may be involved.

Alternate JournalJ. Neuroendocrinol.