New concepts in human sperm-zona pellucida interaction

Human Reproduction
G F ClarkS Oehninger

Abstract

Binding of spermatozoa to the zona pellucida is an initial, crucial recognition event leading to fertilization. In the mouse, the best species characterized so far, the zona pellucida protein 3 (ZP3) has a central role as the specific, primary sperm receptor on the zona and as the inducer of the acrosome reaction. This sequence of events is not clearly understood as it relates to human gametes. The ideal test for the evaluation of sperm-zona pellucida interaction is one that can examine these events in a sequential fashion (i.e. binding followed by the acrosome reaction) in a standardized and specific bioassay. Here we have used the hemizona assay as an internally controlled test to examine human sperm-zona pellucida interaction. Results presented show that: (i) the hemizona assay has an excellent predictive power for IVF outcome and for the identification of male infertility; (ii) using a specific anti-ZP3 antiserum in immunocytochemical studies, the hemizona assay allows for the identification of structural/functional anomalies of the protein backbone of human ZP3 (identification of oocyte anomalies); and (iii) glycobiological studies using the hemizona assay model indicate that the initial sperm-zona pellucida binding requir...Continue Reading

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