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The zona pellucida "receptors"

E Hinsch¹, W Hägele, W B Schill

¹Center of Dermatology and Andrology, Justus-Liebig-Universität Giessen, Germany.

Advances in Experimental Medicine and Biology

|January 1, 1997

Summary

Sperm binding to the zona pellucida is key for fertilization. Antibodies targeting a specific ZP2 protein region significantly inhibited sperm binding, highlighting its functional importance in this crucial interaction.

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Area of Science:

Reproductive Biology
Immunology
Molecular Biology

Background:

Successful fertilization requires sperm binding to the zona pellucida and acrosome reaction.
Zona pellucida glycoproteins ZP1, ZP2, and ZP3 form the egg's outer matrix.
ZP3 mediates initial sperm binding and acrosome reaction induction; ZP2 is implicated in secondary binding and zona hardening.

Purpose of the Study:

To identify functionally relevant ZP2 domains using an immunological approach.
To investigate the role of conserved and divergent ZP2 sequences in sperm-zona pellucida interaction.

Main Methods:

Generated antisera against synthetic peptides from homologous (AS ZP2-20) and divergent (AS ZP2-26) human/mouse ZP2 sequences.
Used immunochemical studies on bovine zonae pellucidae to confirm ZP2 detection by antisera.
Employed the competition-hemizona assay to assess the effect of antisera on sperm-zona pellucida binding.

Main Results:

Both AS ZP2-20 and AS ZP2-26 specifically detected ZP2 protein in bovine zonae pellucidae.
AS ZP2-20 significantly inhibited sperm binding to hemizonae pellucidae (p < 0.0001).
AS ZP2-26 did not affect sperm-egg interaction, indicating the targeted epitope lacks functional relevance for binding.

Conclusions:

Antibodies against ZP2 peptides can serve as markers for ZP2 protein.
The ZP2 epitope recognized by AS ZP2-20 is functionally important for sperm-zona pellucida interaction.
This conserved ZP2 region plays a critical role in mediating sperm binding during fertilization.

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