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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
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.
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:
- 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.