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Deciphering the H-Ras pathway in Xenopus oocyte.

M Gaffré1, A Dupré, R Valuckaite

  • 1Laboratoire de Biologie du Développement, UMR-CNRS 7622, Université Pierre et Marie Curie, Paris, France.

Oncogene
|April 12, 2006
PubMed
Summary

Ras proteins activate M phase promoting factor (MPF) in Xenopus oocytes. While the phosphatidylinositol 3-kinase (PI3K) pathway is crucial for H-Ras-induced MPF activation, it is not involved in progesterone-mediated meiotic maturation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Xenopus oocytes naturally arrest in meiosis I prophase.
  • Meiotic maturation, triggered by progesterone, involves re-entry into meiosis and arrest at metaphase II.
  • The Cyclin B-Cdc2 complex, or M phase promoting factor (MPF), controls this maturation process.

Purpose of the Study:

  • To determine the specific pathway activated by H-Ras leading to MPF activation in Xenopus oocytes.
  • To investigate the role of endogenous H-Ras in the natural meiotic maturation process induced by progesterone.

Main Methods:

  • Generation of constitutively active Xenopus H-Ras double mutants.
  • Engineering mutants to recruit specific effectors: mitogen-activated protein kinase (MAPK), phosphatidylinositol 3-kinase (PI3K), or RalGDS.
  • Assessing MPF activation and meiotic resumption in response to H-Ras activation and progesterone signaling.

Main Results:

  • H-Ras-induced MPF activation critically depends on the activation of a PI3K-related enzyme.
  • Recruitment of MAPK or RalGDS by H-Ras was not essential for MPF activation.
  • The H-Ras/PI3K pathway, though functional in oocytes, does not mediate progesterone-induced meiotic resumption.

Conclusions:

  • Phosphatidylinositol 3-kinase (PI3K) signaling is essential for H-Ras-mediated M phase promoting factor (MPF) activation in Xenopus oocytes.
  • Mitogen-activated protein kinase (MAPK) and RalGDS are not the primary effectors for H-Ras-induced MPF activation in this context.
  • Endogenous H-Ras and its PI3K pathway are not the physiological mediators of progesterone-induced meiotic maturation in Xenopus oocytes.