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Related Experiment Videos

Maturation-associated changes in the rat zona pellucida.

O Rufas1, R Shalgi

  • 1Department of Embryology and Teratology, Sackler School of Medicine, Tel Aviv University, Israel.

Molecular Reproduction and Development
|August 1, 1990
PubMed
Summary
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The zona pellucida (ZP) of rat oocytes changes during maturation, becoming more permeable and facilitating sperm binding. These ZP maturational changes are crucial for successful fertilization.

Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Rat oocytes arrested at prophase I are not fertilizable in vitro.
  • Fertilization capacity is acquired after meiosis resumption and oocyte-cumulus cell changes.
  • Zona pellucida (ZP) permeability increases with time before ovulation.

Purpose of the Study:

  • To investigate maturational changes in the rat ZP.
  • To assess ZP sensitivity to proteolysis and sperm binding during oocyte maturation.

Main Methods:

  • Collected ZP from oocytes/eggs at different maturational stages (GV-intact, preovulatory, ovulated, fertilized).
  • Assessed ZP solubility using pronase and alpha-chymotrypsin.
  • Measured capacitated sperm binding to ZP of GV-intact and ovulated oocytes.

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Main Results:

  • ZP solubility varied significantly between maturational stages.
  • ZP from mature ovulated eggs showed increased pronase and alpha-chymotrypsin sensitivity compared to GV-intact oocytes.
  • Significantly more sperm bound to ZP of ovulated eggs than GV-intact oocytes.

Conclusions:

  • The ZP undergoes maturational changes affecting its biochemical properties.
  • These ZP alterations correlate with increased sperm binding capacity.
  • ZP characteristics differ between immature oocytes and mature eggs, impacting fertilization potential.