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J Biol Chem, Vol. 273, Issue 30, 18705-18708, July 24, 1998
,
From the 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 Xenopus
laevis oocytes via phosphoinositide 3-kinase activation, we
investigated the Akt involvement in this process. Injection of mRNA
coding for a constitutively active Akt in Xenopus 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
Xenopus oocyte and that regulation of the activity of a
PDE3 is a step distal to the kinase activation.
Department of Gynecology and Obstetrics,
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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