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• W2091247632 startingPage "18705" @default.
• W2091247632 abstract "The activation of protein kinase B/Akt is thought to be a critical step in the phosphoinositide 3-kinase pathway that regulates cell growth and differentiation. Because insulin-like growth factor 1 stimulates the resumption of meiosis in <i>Xenopus laevis</i> oocytes via phosphoinositide 3-kinase activation, we investigated the Akt involvement in this process. Injection of mRNA coding for a constitutively active Akt in <i>Xenopus</i> oocytes induced germinal vesicle breakdown (GVBD) to the same extent as progesterone or insulin treatment. Injection of mRNA coding for the wild type Akt kinase was less effective in stimulating GVBD, whereas Akt bearing a lysine mutation in the catalytic domain that abolishes the kinase activity had no effect. A mutant Akt lacking a membrane-targeting sequence did not induce GVBD, despite high levels of expression and activity. As previously reported for insulin, induction of GVBD by Akt was prevented by incubating the oocytes with cilostamide, an inhibitor specific for the type 3 phosphodiesterase (PDE3), suggesting that the activity of a PDE is required for Akt action. That an increase in PDE activity in the oocyte is sufficient to induce meiotic resumption was demonstrated by expression of an active PDE protein. In addition, the constitutively active Akt caused a 2-fold increase in the activity of the endogenous PDE. These data demonstrate that Akt is in the pathway controlling resumption of meiosis in the<i>Xenopus</i> oocyte and that regulation of the activity of a PDE3 is a step distal to the kinase activation." @default.
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• W2091247632 date "1998-07-01" @default.
• W2091247632 modified "2023-10-10" @default.
• W2091247632 title "Protein Kinase B/Akt Induces Resumption of Meiosis in Xenopus Oocytes" @default.
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• W2091247632 doi "https://doi.org/10.1074/jbc.273.30.18705" @default.
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