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Related Experiment Videos

Mitogen-activated protein kinase in human eggs.

Q Y Sun1, Z Blumenfeld, S Rubinstein

  • 1Bar-Ilan University, Rambam Medical Center, Israel.

Zygote (Cambridge, England)
|July 27, 1999
PubMed
Summary

Mitogen-activated protein (MAP) kinase, primarily p42ERK2, is dephosphorylated in human oocytes but phosphorylated in mature eggs. Its activity decreases post-fertilization and in arrested embryos, suggesting a role in cell cycle regulation.

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Area of Science:

  • Reproductive biology
  • Cellular signaling
  • Human embryology

Background:

  • Mitogen-activated protein (MAP) kinase is crucial for cell cycle regulation in various species.
  • Understanding MAP kinase activity in human oocytes and early embryos is vital for reproductive science.

Purpose of the Study:

  • To investigate the expression and activity of MAP kinase (specifically p42ERK2) in human oocytes, unfertilized eggs, and early embryos.
  • To determine the role of MAP kinase phosphorylation in human egg maturation and fertilization.

Main Methods:

  • Immunoblotting using anti-Active MAPK and anti-ERK2 antibodies.
  • Analysis of MAP kinase status in oocytes, mature unfertilized eggs, post-intracytoplasmic sperm injection (ICSI) eggs, degenerated eggs, and early arrested embryos.

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Main Results:

  • The predominant MAP kinase form in human eggs is p42ERK2.
  • MAP kinase was dephosphorylated in germinal vesicle stage oocytes and fully phosphorylated in mature unfertilized eggs.
  • Phosphorylation significantly decreased after pronuclei formation post-ICSI.
  • No MAP kinase expression or activity was found in degenerated eggs.
  • Limited MAP kinase activity was detected in arrested 8-cell or morula stage embryos.

Conclusions:

  • MAP kinase, particularly p42ERK2, undergoes dynamic phosphorylation changes during human egg maturation and fertilization.
  • MAP kinase activity appears essential for progression through the early stages of human embryonic development.
  • These findings highlight the potential role of MAP kinase in human egg cell cycle regulation, consistent with observations in other mammals.