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Updated: Feb 19, 2026

Recording Electrical Currents across the Plasma Membrane of Mammalian Sperm Cells
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Actin cytoskeleton and sperm function.

Haim Breitbart1, Maya Finkelstein2

  • 1The Mina & Everard Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel.

Biochemical and Biophysical Research Communications
|November 6, 2017
PubMed
Summary
This summary is machine-generated.

Sperm need to change in the female reproductive tract to fertilize an egg. This process involves actin remodeling, with actin needing depolymerization before fertilization can occur.

Keywords:
Acrosomal exocytosisActinCapacitationCofilinGelsolinSpermatozoa

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Area of Science:

  • Reproductive Biology
  • Cell Biology
  • Biochemistry

Background:

  • Spermatozoa require biochemical transformations, termed capacitation, to fertilize an egg.
  • Capacitation enables sperm to undergo acrosomal exocytosis near the oocyte, facilitating fertilization.
  • Cytoskeletal remodeling, especially involving actin, is a key event during sperm capacitation.

Purpose of the Study:

  • To review the regulatory mechanisms of F-actin formation during sperm capacitation.
  • To describe the mechanisms controlling F-actin dispersion before acrosomal exocytosis.
  • To elucidate the role of actin-severing proteins in sperm capacitation and acrosomal exocytosis.

Main Methods:

  • This review synthesizes existing research on sperm capacitation and cytoskeletal dynamics.
  • Focuses on the regulation of actin polymerization and depolymerization.
  • Examines the activation and function of actin-severing proteins like gelsolin and cofilin.

Main Results:

  • Actin polymerization occurs during sperm capacitation, forming F-actin.
  • F-actin must be depolymerized prior to the acrosomal exocytosis.
  • Actin-severing proteins, gelsolin and cofilin, are initially inactive and activated before acrosomal exocytosis.

Conclusions:

  • Dynamic regulation of actin polymerization and depolymerization is crucial for sperm function.
  • Activation of gelsolin and cofilin is essential for F-actin dispersion, enabling acrosomal exocytosis.
  • Understanding these mechanisms provides insight into male fertility and potential therapeutic targets.