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Expression of G protein estrogen receptor (GPER) on membrane of mouse oocytes during maturation

Yi-Ran Li1, Chun-E Ren, Quan Zhang

  • 1Department of Obstetrics and Gynecology, Ningxia Medical University, Yinchuan, China.

Journal of Assisted Reproduction and Genetics
|February 20, 2013
PubMed
Abstract

Insights

The G-protein estrogen receptor (GPER) is expressed on mouse oocyte membranes, with expression levels changing during maturation and increasing in aging oocytes, indicating a role in oocyte development.

Area of Science:

  • Reproductive biology
  • Cellular signaling
  • Oocyte development

Background:

  • The G-protein estrogen receptor (GPER), also known as GPR30, is a membrane receptor involved in estrogen signaling.
  • Oocyte maturation is a critical process for female fertility, involving complex molecular changes.
  • Understanding the role of GPER in oocyte maturation is crucial for reproductive health research.

Purpose of the Study:

  • To investigate the expression patterns of GPER in mouse oocytes during various maturation stages.
  • To determine if GPER expression changes in vitro versus in vivo maturation and in aging oocytes.

Main Methods:

  • Immune-fluorescence staining using a GPR30 antibody was employed to visualize GPER on oocyte membranes.
  • Laser scanning confocal microscopy was used for image analysis of GPER expression.
  • Western blot analysis with cell fractionation was performed for further confirmation of GPER expression.

Main Results:

  • Significant GPER fluorescent signals were detected on the surface of mouse oocytes.
  • GPER expression was lower in germinal vesicle (GV) stage oocytes compared to mature metaphase-II (M-II) stage oocytes.
  • In vivo matured oocytes exhibited higher GPER expression than in vitro matured oocytes, with the highest expression observed in aging oocytes.

Conclusions:

  • The observed changes in GPER expression on the mouse oocyte plasma membrane correlate with oocyte maturation.
  • These dynamic changes in GPER suggest its involvement in the functional aspects of oocyte maturation.
  • GPER may play a significant role in regulating oocyte quality and developmental potential, particularly in aging oocytes.

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