Potential role of protein tyrosine phosphatase nonreceptor type 13 in the control of oocyte meiotic maturation

Development
Taku Nedachi, M Conti

Abstract

Protein tyrosine phosphatase nonreceptor type 13 (PTPN13) is a tyrosine phosphatase with multiple interacting domains that has been implicated previously in the regulation of apoptosis. We provide evidence that PTPN13 plays an important role in the control of the meiotic cell cycle. A cDNA coding for PTPN13 was isolated during the screening for the substrate of protein kinase A expressed in mammalian oocytes. PTPN13 is expressed in both mouse and Xenopus oocytes and is a substrate for protein kinase A in vitro and in vivo. Expression of a truncated constitutively-active PTPN13 in Xenopus oocytes synergizes with progesterone in the induction of germinal vesicle breakdown, the translation of Mos, the phosphorylation of Erk and the dephosphorylation of Cdc2. The phosphatase activity of PTPN13 is required for this synergism. Oocyte injection with specific small interference RNA downregulates the expression of mRNA for PTPN13 and blocks oocyte maturation induced by progesterone, a blockade that can be overcome by Cdc25 overexpression. These findings indicate that PTPN13 is involved in the regulation of the meiotic cell cycle.

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Citations

Feb 27, 2008·The FEBS Journal·Wiljan J A J HendriksAndrew W Stoker
Nov 13, 2008·International Journal of Cancer. Journal International Du Cancer·Françoise RévillionGilles Freiss
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Jun 3, 2006·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Lan GuoYong Qian

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