[Sperm penetration assay in normozoospermia]

Area of Science:

• Reproductive biology
• Andrology
• Human fertility studies

Background:

• Male infertility affects a significant portion of couples seeking fertility treatment.
• Standard semen analysis provides basic sperm parameters but may not fully predict fertilization potential.
• Advanced diagnostic tools are needed to identify causes of infertility in men with apparently normal sperm parameters.

Purpose of the Study:

• To evaluate the efficacy of the hamster oocyte penetration test (HOTP) in assessing human sperm fertilization capacity.
• To determine if HOTP can differentiate between fertile and infertile men, including those with normozoospermia.
• To explore the utility of HOTP as a diagnostic tool in male infertility.

Main Methods:

• Human spermatozoa from normozoospermic, infertile, and fertile males were cryopreserved in liquid nitrogen.
• The fertilization potential of these spermatozoa was assessed using the hamster oocyte penetration test.
• Sperm samples were obtained from a cohort of 18 normozoospermic, 12 infertile, and 6 fertile males.

Main Results:

• A highly significant difference in oocyte penetration rates was observed between the groups of infertile and fertile men.
• The hamster oocyte penetration test demonstrated a clear distinction in sperm function between fertile and infertile individuals.
• Cryopreserved sperm samples yielded significant results in the penetration assay.

Conclusions:

• The hamster oocyte penetration test is a valuable functional assay for human sperm.
• HOTP can serve as a useful diagnostic aid in male infertility, especially when routine semen parameters are within normal limits.
• This assay provides insights into sperm's ability to fertilize an oocyte, complementing traditional semen analysis.