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Roles of gene transcription and PKA subtype activation in maturation of murine oocytes

K F Rodriguez1, R M Petters, A E Crosier

  • 1Department of Animal Science, North Carolina State University, 231B Polk Hall, Raleigh, NC 27695-7621, USA.

Reproduction (Cambridge, England)
|June 8, 2002
PubMed

Insights

Follicle-stimulating hormone (FSH) triggers meiosis resumption in mouse oocytes via a transcriptional mechanism involving type II protein kinase A (PKA). This process requires cumulus cells and gene transcription for germinal vesicle breakdown (GVBD).

Area of Science:

  • Reproductive Biology
  • Cellular Signaling
  • Molecular Endocrinology

Background:

  • Meiosis resumption in oocytes is crucial for female fertility.
  • The roles of transcription and protein kinase A (PKA) in this process are not fully elucidated.
  • Understanding these mechanisms can inform fertility treatments and reproductive research.

Purpose of the Study:

  • To investigate the role of gene transcription in meiosis resumption in mouse oocytes.
  • To examine the involvement of type I and type II protein kinase A (PKA) in this process.
  • To determine the specific signaling pathways initiated by follicle-stimulating hormone (FSH).

Main Methods:

  • Murine cumulus-oocyte complexes (COCs) were treated with transcriptional inhibitors (DRB and alpha-amanitin).
  • Germinal vesicle breakdown (GVBD) was assessed in the presence or absence of FSH, cumulus cells, and PKA activators.
  • The impact of type I and type II PKA activation on transcription-dependent GVBD was evaluated.

Main Results:

  • FSH-induced GVBD was dependent on gene transcription and the presence of cumulus cells.
  • Activation of type I PKA led to GVBD arrest independent of transcription.
  • Activation of type II PKA promoted meiosis resumption, requiring gene transcription.

Conclusions:

  • FSH signaling in mouse COCs activates type II PKA, initiating a transcriptional event essential for GVBD.
  • Cumulus cells play a critical role in mediating FSH's transcriptional effects on oocyte maturation.
  • Type II PKA-mediated transcription is a key downstream event in FSH-induced resumption of meiosis.

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