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Sperm selection capacity of the human zona pellucida
R Menkveld1, D R Franken, T F Kruger
1Department of Obstetrics and Gynecology, Tygerberg Hospital, Republic of South Africa.
Molecular Reproduction and Development
|December 1, 1991
Summary
The hemizona assay (HZA) shows that sperm binding to the zona pellucida selects for morphologically normal sperm. This indicates a natural filtering mechanism for sperm quality in human fertilization.
Area of Science:
- Reproductive Biology
- Human Fertility
- Sperm Morphology
Background:
- Previous hemizona assay (HZA) studies show a correlation between normal sperm percentage and zona pellucida binding.
- Sperm morphology is a key indicator of male fertility.
Purpose of the Study:
- To evaluate the morphologic features of spermatozoa tightly bound to the zona pellucida using strict criteria.
- To compare sperm morphology in semen, after swim-up, and after zona pellucida binding.
Main Methods:
- Utilized semen samples from normozoospermic and teratozoospermic men.
- Performed hemizona assay (HZA) to assess zona pellucida binding.
- Analyzed sperm morphology using strict criteria before and after sperm preparation (swim-up) and zona binding.
Main Results:
- Normozoospermic men showed significantly higher percentages of normal sperm forms among zona-bound sperm compared to swim-up and seminal sperm (p=0.02).
- Teratozoospermic men also exhibited significantly higher percentages of normal sperm forms in zona-bound sperm compared to swim-up and seminal samples (p<0.01 and p<0.0003).
- Results indicate a selective process favoring morphologically normal spermatozoa at the zona pellucida.
Conclusions:
- The zona pellucida acts as a selective barrier, favoring the binding of morphologically normal spermatozoa.
- This finding has implications for understanding natural fertilization processes and male infertility.
- Strict morphologic assessment of zona-bound sperm can provide valuable insights into sperm function.