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A simple zeta method for sperm selection based on membrane charge.

Philip J Chan1, John D Jacobson, Johannah U Corselli

  • 1Department of Gynecology and Obstetrics, Center for Fertility and In Vitro Fertilization, Loma Linda University School of Medicine, Loma Linda, California, USA. pchann@yahoo.com

Fertility and Sterility
|April 6, 2006
PubMed
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A novel zeta potential method enhances sperm quality, significantly improving maturity, morphology, and DNA integrity. This technique shows promise for boosting fertilization and pregnancy rates in assisted reproduction.

Area of Science:

  • Reproductive Biology
  • Sperm Physiology
  • Assisted Reproductive Technology

Background:

  • Sperm selection is crucial for successful assisted reproduction.
  • Current methods may not fully optimize sperm parameters for fertilization.

Purpose of the Study:

  • To develop a simple zeta potential method for sperm isolation.
  • To analyze the impact of this method on sperm maturity, morphology, kinematics, and DNA integrity.

Main Methods:

  • Adapted the phenomenon of sticky sperm adhering to slide surfaces for collecting charged sperm.
  • Used discarded colloid-washed sperm from routine laboratory testing (n=8).
  • Centrifuged sperm in serum-free medium for analysis of kinematic parameters, DNA integrity, and maturity.

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Main Results:

  • Significant increases observed in mature sperm (73.0% vs. 63.5%) and DNA intact sperm (85.0% vs. 69.5%).
  • Twofold increases in strict normal morphology (19.3% vs. 10.0%), hyperactivation (7.0% vs. 3.6%), and progressive motility (29.1% vs. 19.9%).

Conclusions:

  • The zeta potential method improved key sperm parameters, potentially increasing fertilization and pregnancy rates.
  • Sperm manipulation stimulated metabolism without premature acrosome reactions.
  • Total motility remained unchanged, indicating no association with zeta potential.