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• W2140874814 abstract "EGF has been shown to influence meiotic maturation and development competence of oocyte in various mammalian species. We previously reported, in goat, that the EGF receptor (EGF-R) was present both on cumulus cells and oocytes. Here, EGF-induced signaling was investigated during the in vitro maturation process in goat cumulus-oocyte complexes (COCs). Cumulus cells and oocytes were subjected to Western immunoblotting analysis using anti-MAP kinase, anti-phosphotyrosine, anti-phospho MAP kinase, and anti-phospho EGF-R antibodies. We demonstrated that treatment with EGF during the in vitro maturation process induced rapid tyrosine phosphorylation of EGF-R in a time and concentration dependent manner in cumulus cells. A similar pattern of activation by phosphorylation was observed for MAP kinase upon EGF stimulation. AG 1478, an inhibitor of the EGF kinase, suppressed EGF-stimulated phosphorylation of EGF-R and also affected the MAP kinase activation. Treatment with the MEK inhibitor PD 98059 abolished EGF-induced MAP kinase activation. We did not observe oocyte EGF-R phosphorylation in our experiments during the in vitro maturation process. Our data indicate, in goat cumulus cells, that activation of EGF-R by EGF triggers signaling through the MAP kinase pathway during in vitro maturation. This supports the hypothesis that the major site of action for EGF, that regulates oocyte maturation, is the cumulus cell." @default.
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• W2140874814 date "2005-04-27" @default.
• W2140874814 modified "2023-10-10" @default.
• W2140874814 title "EGF-induced EGF-receptor and MAP kinase phosphorylation in goat cumulus cells during in vitro maturation" @default.
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• W2140874814 doi "https://doi.org/10.1002/mrd.20317" @default.
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