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Related Experiment Videos

Modulation of human sperm function by follicular fluid.

M J Munuce1, A M Caille, G Botti

  • 1Laboratorio de Estudios Reproductivos, Cátedra de Bioquímica Clínica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina. reprolab@citynet.ar

Andrologia
|November 16, 2004
PubMed
Summary

Human follicular fluid (hFF) significantly reduces sperm binding to the zona pellucida by decreasing alpha-d-mannose receptors. This impacts sperm fertilizing capacity without affecting viability or motility.

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Area of Science:

  • Reproductive Biology
  • Sperm Physiology
  • Infertility Research

Background:

  • Human follicular fluid (hFF) is present in the female reproductive tract.
  • hFF has been suggested to influence sperm-egg interactions.

Purpose of the Study:

  • To investigate the effects of hFF on sperm function.
  • To determine the mechanisms by which hFF affects sperm-zona pellucida binding.

Main Methods:

  • Hemizona binding assay to quantify sperm-zona pellucida binding.
  • Assessment of sperm viability, motility, and acrosomal status.
  • Measurement of alpha-d-mannose binding sites on sperm.
  • Evaluation of sperm fertilizing capacity using ionophore challenge.

Main Results:

Related Experiment Videos

  • 50% hFF significantly reduced sperm bound to the zona pellucida (P=0.03).
  • hFF exposure decreased alpha-d-mannose binding sites on capacitated sperm (P<0.05).
  • Sperm fertilizing capacity was diminished in the presence of hFF (P<0.01).
  • No changes in sperm viability, motility, or protein tyrosine phosphorylation were observed.

Conclusions:

  • hFF reduces sperm zona pellucida binding capacity.
  • The mechanism involves a decrease in sperm alpha-d-mannose receptors.
  • hFF negatively impacts sperm function and fertilizing potential.