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Laurdan fluorescence: a simple method to evaluate sperm plasma membrane alterations.

A Ambrosini1, G Zolese, G Balercia

  • 1Institute of Biochemistry, Medical School, University of Ancona, Ancona, Italy. zolese@popsci.unian.it

Fertility and Sterility
|September 5, 2001
PubMed
Summary

A simple fluorescence method using Laurdan can detect sperm plasma membrane alterations in infertile men with normal semen analysis. This technique aids in understanding unexplained male infertility by revealing lipid bilayer changes.

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Area of Science:

  • Andrology
  • Biochemistry
  • Reproductive Medicine

Background:

  • Unexplained male infertility is a significant clinical challenge.
  • Sperm plasma membrane integrity, particularly lipid bilayer organization, is crucial for male fertility.
  • Routine semen analysis may not fully capture subtle membrane alterations.

Purpose of the Study:

  • To evaluate Laurdan fluorescence Generalized Polarization (GP) as a simple method to detect sperm plasma membrane alterations.
  • To correlate these alterations with sperm concentration, motility, speed, and vitality.
  • To assess the utility of this method in diagnosing unexplained male infertility.

Main Methods:

  • A pilot study was conducted in an andrology laboratory and biochemistry institute.

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  • Semen samples from men undergoing infertility investigations were analyzed.
  • Laurdan fluorescence GP was measured to assess sperm plasma membrane lipid bilayer order and polarity.
  • Data were analyzed as a function of sperm cell concentration, motility, linear speed, and vitality.

    • Main Results:

    • Sperm plasma membranes exhibited distinct liquid-crystalline phases with varying degrees of order and polarity.
    • Mean GP values differed significantly between high (>32 x 10^6 cells/mL; 0.303 ± 0.015) and low sperm concentrations (<32 x 10^6 cells/mL; 0.365 ± 0.026).
    • Approximately 50% of samples with normal semen characteristics (≥20 x 10^6 cells/mL) showed high GP values, indicating membrane alterations.

    Conclusions:

    • Laurdan fluorescence provides a simple and effective method for evaluating sperm plasma membrane alterations.
    • This method is particularly valuable for infertile men with normal routine semen parameters.
    • It serves as a potential tool for infertility assessment by identifying critical physicochemical alterations in the sperm bilayer.