Related Experiment Video
Updated: May 12, 2025
05:04
Author Spotlight: A Live Cell Imaging Technique to Study Calcium Signaling and Acrosome Exocytosis in Mouse Sperm
Published on: October 13, 2023
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TMEM16A Maintains Acrosomal Integrity Through ERK1/2, RhoA, and Actin Cytoskeleton During Capacitation
Ana L Roa-Espitia1, Tania Reyes-Miguel1, Monica L Salgado-Lucio1,2
1Department of Cell Biology, Center of Research and Advanced Studies of the National Polytechnic Institute, México Av. Instituto Politécnico Nacional 2508, México City 07360, Mexico.
International Journal of Molecular Sciences
|May 7, 2025
Summary
The calcium-activated chloride channel TMEM16A is crucial for maintaining sperm volume and acrosomal structure during capacitation by regulating actin polymerization and key protein activities.
Area of Science:
- Reproductive biology
- Sperm physiology
- Ion channel function
Background:
- Mammalian spermatozoa require physiological changes in the oviduct for fertilization competence.
- Sperm viability during oviductal transit is influenced by environmental factors and ion transporters.
- Chloride channels like TMEM16A, CFTR, and ClC3 are present in sperm and linked to capacitation and motility, but their role in sperm volume regulation is unclear.
Purpose of the Study:
- To investigate the mechanism by which TMEM16A (calcium-activated chloride channel) maintains sperm volume during capacitation.
- To compare the effects of TMEM16A with CFTR and ClC3 on sperm volume and related processes.
Main Methods:
- Spermatozoa were capacitated in the presence of specific inhibitors for TMEM16A, CFTR, and ClC3.
- Evaluated changes in acrosomal volume, actin polymerization, ERK1/2 and RhoA activation, capacitation, and spontaneous acrosomal reaction.
- Compared the effects of inhibiting TMEM16A, CFTR, and ClC3 individually.
Main Results:
- Inhibition of TMEM16A, but not CFTR or ClC3, led to increased acrosomal volume and internal acrosomal changes.
- TMEM16A inhibition prevented actin polymerization, ERK1/2, and RhoA activation during capacitation.
- TMEM16A and CFTR inhibition impacted both capacitation and spontaneous acrosomal reaction; ClC3 inhibition only affected spontaneous acrosomal reaction.
Conclusions:
- TMEM16A plays a critical role in regulating sperm volume and acrosomal structure during capacitation.
- TMEM16A activity is essential for maintaining acrosomal integrity via actin polymerization and regulating ERK1/2 and RhoA pathways.
- TMEM16A, CFTR, and ClC3 exhibit distinct roles in sperm capacitation and acrosomal reaction.
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