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Epiregulin-dependent amphiregulin expression and ERBB2 signaling are involved in luteinizing hormone-induced paracrine signaling pathways in mouse ovary
- Epiregulin-dependent amphiregulin expression and ERBB2 signaling are involved in luteinizing hormone-induced paracrine signaling pathways in mouse ovary
- Kim K.; Lee H.; Threadgill D.W.; Lee D.
- Ewha Authors
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- Biochemical and Biophysical Research Communications
- Biochemical and Biophysical Research Communications vol. 405, no. 2, pp. 319 - 324
- SCI; SCIE; SCOPUS
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- Sustained EGF receptor (EGFR) phosphorylation by de novo synthesis of EGFR ligands plays an essential role in mediating luteinizing hormone (LH)-induced ovulation process in the preovulatory follicles (POFs). In the present study, the effect of epiregulin (EREG) on oocyte maturation and ovulation was investigated using Ereg knockout (Ereg -/-) mice congenic on a C57BL/6 background. Rate of spontaneous oocyte meiotic resumption of denuded oocytes (DOs) or cumulus cell-oocyte complexes (COCs) in vitro is similar between wild-type and Ereg -/- mice. However, gonadotropin-induced meiotic resumption in vivo is attenuated, and the number of COCs with expanded cumulus matrix and superovulated eggs dramatically decrease in Ereg -/- mice. Nonetheless, the number of eggs ovulated during normal estrus cycles and litter sizes in Ereg -/- mice are comparable to those of wild-type littermates. In contrast to other EGFR ligands, induction of amphiregulin (Areg) mRNA is severely reduced in ovaries collected from Ereg -/- mice either after human chorionic gonadotropin (hCG) treatment in immature mice or LH surge in adults. Gonadotropin-induced EGFR and ERBB2 phosphorylation in ovaries is attenuated in immature Ereg -/- mice, and MAPK3/1 phosphorylation and prostaglandin synthase 2 (PTGS2) protein levels are reduced. This attenuation, however, is no longer detectable in adult Ereg -/- mice after LH surge. This study implicates that EREG mediates signals downstream of Areg mRNA expression and that EGFR-ERBB2 signals contributes to regulation of ovulation process. © 2011 Elsevier Inc.
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