Gonadotropin-releasing hormone rapidly alters polyphosphoinositide metabolism in rat granulosa cells

John S. Davis, Leigh A. West, Robert V. Farese

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

This report describes the rapid effects of GnRH and an agonist [D-Ala6, des-Gly10] GnRH ethylamide (GnRHa) on polyphosphoinositide metabolism in rat granulosa cells. As indicated by the depletion of cellular levels of 32P-prelabeled triphosphoinositide (TPI) and diphosphoinositide (DPI), GnRHa rapidly stimulated the hydrolysis of TPI and DPI. The effect of GnRHa was maximal at the earliest time point examined (30 sec) and preceded GnRHa-induced increases in labeling of phosphatidylinositol. A specific GnRH antagonist had no effect on TPI or DPI levels, but prevented the polyphosphoinositide depletion induced by GnRH. LH did not stimulate depletion of 32P-polyphosphoinositides. The rapid and specific effects of GnRH on polyphosphoinositide depletion may represent an early and possibly initiating event in the action of GnRH.

Original languageEnglish (US)
Pages (from-to)1289-1295
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume122
Issue number3
DOIs
StatePublished - Aug 16 1984

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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