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REPRODUCTION-DEVELOPMENT |
The Jackson Laboratory, Bar Harbor, Maine 04609
Address all correspondence and requests for reprints to: Dr. J. J. Eppig, The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine 04609. E-mail: . jje{at}jax.org
This study investigated the participation of MAPK in the resumption of meiosis [germinal vesicle breakdown (GVB)] in oocytes and cumulus expansion using oocyte-cumulus cell complexes (OCC) from Mos-null mice (Mostm1Ev/Mostm1Ev, hereafter Mos-/-). MAPK activity was not detected in Mos-/- oocytes whether they matured in vivo or in vitro, with or without gonadotropin stimulation. Therefore, there are no pathways independent of MOS that activate MAPK during gonadotropin-induced maturation. In contrast, MAPK activity was always detected coincident with GVB in Mos+/+ oocytes. Moreover, MAPK activity was detected in cumulus cells before gonadotropin-induced GVB in OCC regardless of genotype. A specific inhibitor (U0126) of MEK, a MAPKK required for MAPK activity, inhibited gonadotropin-induced GVB in OCC of both Mos+/+ and Mos-/- mice. Activation of MAPK was downstream of elevation of cAMP. U0126 also inhibited cumulus expansion stimulated by FSH, epidermal growth factor, 8-bromo-cAMP, and recombinant growth differentiation factor-9. It is concluded that under the in vitro conditions used here, gonadotropin-induced GVB requires the participation of MAPK activity in the cumulus cells, but not in the oocyte. Moreover, the induction of cumulus expansion also requires the participation of MAPK, and this action is downstream of both elevation of cAMP and growth differentiation factor-9.
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