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Related Experiment Videos

Immunoglobulin binding factor in human seminal plasma: immunological function

N Maeda1, M Kamada, T Daitoh

  • 1Department of Obstetrics and Gynecology, School of Medicine, University of Tokushima, Japan.

Archives of Andrology
|July 1, 1993
PubMed
Summary
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Human seminal plasma contains a protein, IgG binding factor (IgBF), that suppresses B cell activation. This protein specifically inhibits pokeweed mitogen-induced lymphocyte blastogenesis, suggesting a role in immune regulation within the genital tract.

Area of Science:

  • Immunology
  • Reproductive Biology
  • Protein Biochemistry

Background:

  • Human seminal plasma contains various proteins that can influence the immune system.
  • Immunoglobulin G (IgG) plays a role in immune responses, including those in the reproductive tract.

Purpose of the Study:

  • To identify and characterize a protein in human seminal plasma that binds IgG.
  • To investigate the functional role of this protein in immune cell activation.

Main Methods:

  • Purification of IgG binding factor (IgBF) from human seminal plasma.
  • Assays to measure lymphocyte blastogenesis induced by various mitogens (pokeweed mitogen, phytohemagglutinin, Concanavalin A).
  • Assessment of IgBF's effect on other immune functions like cell-mediated cytotoxicity and natural killer cell activity.

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Main Results:

  • A 16 kd protein, named IgG binding factor (IgBF), was identified in human seminal plasma.
  • Purified IgBF specifically suppressed pokeweed mitogen-induced lymphocyte blastogenesis.
  • IgBF showed minimal to no effect on lymphocyte activation by other mitogens or on other immune cytotoxic activities.

Conclusions:

  • IgBF may play a role in modulating immune responses within the male and female genital tracts.
  • The specific suppression of B cell activation by IgBF suggests a mechanism for immune tolerance or regulation in reproduction.