Luteinizing hormone-dependent activation of the epidermal growth factor network is essential for ovulation

Minnie Hsieh, Daekee Lee, Sara Panigone, Kathleen Horner, Ruby Chen, Alekos Theologis, David C. Lee, David W. Threadgill, Marco Conti

Research output: Contribution to journalArticlepeer-review

271 Scopus citations

Abstract

In the preovulatory ovarian follicle, mammalian oocytes are maintained in prophase meiotic arrest until the luteinizing hormone (LH) surge induces reentry into the first meiotic division. Dramatic changes in the somatic cells surrounding the oocytes and in the follicular wall are also induced by LH and are necessary for ovulation. Here, we provide genetic evidence that LH-dependent transactivation of the epidermal growth factor receptor (EGFR) is indispensable for oocyte reentry into the meiotic cell cycle, for the synthesis of the extracellular matrix surrounding the oocyte that causes cumulus expansion, and for follicle rupture in vivo. Mice deficient in either amphiregulin or epiregulin, two EGFR ligands, display delayed or reduced oocyte maturation and cumulus expansion. In compound-mutant mice in which loss of one EGFR ligand is associated with decreased signaling from a hypomorphic allele of the EGFR, LH no longer signals oocyte meiotic resumption. Moreover, induction of genes involved in cumulus expansion and follicle rupture is compromised in these mice, resulting in impaired ovulation. Thus, these studies demonstrate that LH induction of epidermal growth factor-like growth factors and EGFR transactivation are essential for the regulation of a critical physiological process such as ovulation and provide new strategies for manipulation of fertility.

Original languageEnglish
Pages (from-to)1914-1924
Number of pages11
JournalMolecular and Cellular Biology
Volume27
Issue number5
DOIs
StatePublished - Mar 2007

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