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Related Experiment Videos

Equine oocyte maturation with epidermal growth factor.

P L Lorenzo1, I K M Liu, G F Carneiro

  • 1Departamento de Fisiología Animal, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain.

Equine Veterinary Journal
|July 16, 2002
PubMed
Summary

Epidermal growth factor (EGF) significantly improves equine oocyte maturation in vitro. Its receptor (EGFR) is present in equine ovaries, suggesting a key role for EGF in equine reproductive technologies.

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Area of Science:

  • Reproductive Biology
  • Cell Signaling
  • Veterinary Science

Background:

  • Epidermal growth factor (EGF) is known to positively influence oocyte maturation in various species.
  • Understanding EGF's role in equine oocyte maturation is crucial for advancing assisted reproductive technologies in horses.

Purpose of the Study:

  • To determine the capacity of equine oocytes to achieve nuclear maturation with EGF.
  • To localize the Epidermal Growth Factor Receptor (EGFR) within the equine ovary using immunohistochemical methods.

Main Methods:

  • Equine oocytes were retrieved and cultured in three groups: control, EGF-supplemented, and oestrous mare serum (EMS)-supplemented.
  • Oocytes were treated with varying concentrations of tyrphostin A-47, a tyrosine kinase inhibitor.
  • Immunohistochemistry was employed to detect EGFR localization in ovarian tissues.

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Main Results:

  • EGF treatment significantly increased the rate of oocytes reaching metaphase II compared to controls (69.4% vs. 26.9%).
  • Tyrphostin A-47 effectively inhibited the maturation-promoting effect of EGF on oocytes.
  • EGFR was localized in equine follicles, predominantly in cumulus cells over mural granulosa cells.

Conclusions:

  • EGF plays a significant physiological role in regulating equine oocyte nuclear maturation.
  • The presence and inhibitory response of EGFR suggest a functional pathway for EGF signaling in equine oocytes.
  • These findings support the potential application of EGF in equine assisted reproductive technologies.