Expression of the GABAA receptor associated protein Gec1 is circadian and dependent upon the cellular clock machinery in GnRH secreting GnV-3 cells

Virginie Mansuy, Pierre Yves Risold, Micheline Glauser, Annick Fraichard, François P. Pralong

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The timely regulation of gonadotropin-releasing hormone (GnRH) secretion requires a GABAergic signal. We hypothesized that GEC1, a protein promoting the transport of GABAA receptors, could represent a circadian effector in GnRH neurons. First, we demonstrated that gec1 is co-expressed with the GABAA receptor in hypothalamic rat GnRH neurons. We also confirmed that the clock genes per1, cry1 and bmal1 are expressed and oscillate in GnRH secreting GnV-3 cells. Then we could show that gec1 is expressed in GnV-3 cells, and oscillates in a manner temporally related to the oscillations of the clock transcription factors. Furthermore, we could demonstrate that these oscillations depend upon Per1 expression. Finally, we observed that GABAA receptor levels at the GnV-3 cell membrane are timely modulated following serum shock. Together, these data demonstrate that gec1 expression is dependent upon the circadian clock machinery in GnRH-expressing neurons, and suggest for the first time that the level of GABAA receptor at the cell membrane may be under timely regulation. Overall, they provide a potential mechanism for the circadian regulation of GnRH secretion by GABA, and may also be relevant to the general understanding of circadian rhythms.

Original languageEnglish (US)
Pages (from-to)68-76
Number of pages9
JournalMolecular and Cellular Endocrinology
Volume307
Issue number1-2
DOIs
StatePublished - Aug 13 2009

Keywords

  • Clock
  • GABA receptor
  • GnRH
  • Hypothalamus
  • gec1

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Endocrinology

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