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Related Experiment Videos

[Oocyte apoptosis: when, how, why?]

M A Driancourt1, T Fair, K Reynaud

  • 1INRA-URA CNRS 1291, Monnaie, France.

Contraception, Fertilite, Sexualite (1992)
|November 12, 1998
PubMed
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Ovarian follicle store size is determined by germ cell multiplication, meiosis timing, and apoptosis-driven loss. Understanding apoptosis mechanisms is crucial for preserving female fertility.

Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cell Biology

Background:

  • The ovarian reserve of primordial follicles is established during oogenesis.
  • Follicle store size depends on germ cell proliferation, meiosis initiation timing, and germ cell loss.
  • Apoptosis is a key mechanism of germ cell loss, but its regulation is not fully understood.

Purpose of the Study:

  • To investigate the mechanisms regulating germ cell apoptosis during oogenesis.
  • To understand the role of apoptosis in determining the primordial follicle store size.
  • To explore the control of apoptosis in adult ovarian primordial follicles.

Main Methods:

  • Analysis of germ cell apoptosis in embryonic and adult ovaries.
  • Examination of the expression and function of death and survival signaling pathways (e.g., TNF-alpha, Fas ligand, LIF, kit ligand).

Related Experiment Videos

  • Investigation of the involvement of apoptotic cascade genes (e.g., bcl2, bax, caspases) using gene knockout models.

    • Main Results:

    • Both pro-apoptotic (TNF-alpha, Fas ligand) and pro-survival (LIF, kit ligand) signals are present in the embryonic gonad.
    • Genetic alterations in apoptotic cascade genes (bcl2, bax, caspases) significantly impact the primordial follicle store.
    • Apoptosis contributes to oocyte death within primordial follicles in adult ovaries, though its regulation remains understudied.

    Conclusions:

    • Apoptosis plays a critical role in regulating the size of the primordial follicle pool during oogenesis.
    • Understanding the molecular mechanisms of apoptosis is essential for comprehending the maintenance of female fertility.
    • Further research is needed to elucidate the control mechanisms of apoptosis in adult ovarian primordial follicles.