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Related Experiment Videos

Antibody-induced changes on rabbit sperm surface inhibit gamete interaction

C Shaha1

  • 1Sperm Biotechnology Laboratory, National Institute of Immunology, New Delhi, India.

Molecular Reproduction and Development
|August 1, 1994
PubMed
Summary

Rabbit sperm surface antigens undergo patching and capping when bound by antibody B-12. Capping is energy-dependent and involves the cytoskeleton, impacting sperm-oocyte binding.

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Area of Science:

  • Reproductive biology
  • Cellular immunology
  • Spermatozoa surface dynamics

Background:

  • Cell surface molecules can reorganize upon ligand interaction.
  • Spermatozoa possess unique surface antigens crucial for fertilization.

Purpose of the Study:

  • To investigate the dynamic behavior of rabbit sperm surface antigens.
  • To elucidate the mechanisms and energy requirements of antigen-antibody complex reorganization on sperm.
  • To assess the role of these surface changes in sperm-oocyte interaction.

Main Methods:

  • Utilized a monoclonal antibody (B-12) targeting 40kDa sperm surface antigens.
  • Observed antigen-antibody complex redistribution (patching and capping) at different temperatures (0°C and 37°C).
  • Assessed the role of energy (sodium azide) and cytoskeleton (cytochalasin B/D) in these processes.

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  • Evaluated the effect of antigen-antibody complex distribution on sperm-oocyte adhesion.

    • Main Results:

    • Monoclonal antibody B-12 induced patching at 0°C and capping at 37°C on rabbit sperm.
    • Capping is an energy-dependent process, while patching is not.
    • Cytoskeleton-disrupting agents potentiated capping, suggesting cytoskeletal involvement.
    • Loss of surface complexes occurred via shedding; both patched and denuded sperm showed reduced oocyte binding.

    Conclusions:

    • Sperm surface antigen-antibody complexes exhibit temperature-dependent redistribution (patching and capping).
    • Capping is an active, energy-dependent process involving the sperm cytoskeleton.
    • Disruption of surface antigen complexes, either through patching or shedding, impairs sperm-oocyte adhesion.