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Ovulation: A cellular symphony in three movements.

Christopher Thomas1

  • 1IBDM - Institut de Biologie du Développement de Marseille, CNRS - UMR 7288, Aix-Marseille Université, Marseille, France.

Seminars in Cell & Developmental Biology
|July 13, 2025
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Summary
This summary is machine-generated.

Ovulation is a complex reproductive process involving follicle remodeling and egg release, triggered by hormones like FSH and LH. Recent studies reveal it as a coordinated, stepwise event, not just egg expulsion.

Keywords:
Actomyosin contractionCorpusCumulus expansionEpidermal growth factor (EGF)Extracellular matrix (ECM) remodellingFollicle ruptureFollicle-stimulating hormone (FSH)FolliculogenesisGranulosa cellsHyaluronic acidLuteinising, hormone (LH)LuteumMeiosisOogenesisOvarian follicleOvulationProgesterone signalling

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Area of Science:

  • Reproductive Biology
  • Cellular and Molecular Biology
  • Developmental Biology

Background:

  • Ovulation is crucial for mammalian reproduction, involving intricate follicle remodeling.
  • Hormonal cues, including follicle-stimulating hormone (FSH) and luteinizing hormone (LH), initiate ovulation.
  • Follicle-derived signals like epidermal growth factor (EGF) and progesterone propagate the ovulatory response.

Purpose of the Study:

  • To present a novel temporal framework for understanding ovulation.
  • To highlight recent advances in visualizing ovulation using ex vivo culture and live imaging.
  • To emphasize ovulation as a coordinated, stepwise process rather than solely egg release.

Main Methods:

  • Review of recent literature on ovulation.
  • Utilisation of ex vivo follicle culture techniques.
  • Application of live imaging in mouse follicles.

Main Results:

  • Ovulation is a stepwise, self-contained program with dynamic spatial and temporal coordination.
  • The oocyte remains stationary for most of ovulation, moving only shortly before release.
  • Ovulation involves a prolonged sequence of cellular and tissue-level events, not just egg expulsion.

Conclusions:

  • Ovulation can be conceptualized as a symphony orchestrated by follicular cells, progressing through distinct phases.
  • This framework aids in understanding ovulation as a developmental performance marking reproductive readiness.
  • Ovulation is a complex, regulated process essential for transitioning to potential fertilization and new life.