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Related Experiment Videos

Multireactive human monoclonal antibodies.

S T Kiessig1, S Jahn, F Hiepe

  • 1Department of Medical Immunology, School of Medicine (Charité), Humboldt University, Berlin.

Allergie Und Immunologie
|January 1, 1990
PubMed
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Most human monoclonal IgM antibodies bind multiple antigens, unlike IgG antibodies which show limited multireactivity. This study investigates the antigen-binding capabilities of human monoclonal antibodies.

Area of Science:

  • Immunochemistry
  • Molecular Biology
  • Serology

Background:

  • Human monoclonal antibodies are crucial tools in research and diagnostics.
  • Understanding their antigen-binding properties is essential for their effective application.
  • Previous studies have explored antibody specificity, but multireactivity requires further investigation.

Purpose of the Study:

  • To investigate the reactivity of human monoclonal antibodies with a diverse range of antigens.
  • To determine the extent of multireactivity in human monoclonal IgM and IgG antibodies.
  • To characterize the specificity of observed antibody-antigen interactions.

Main Methods:

  • Utilized various immunochemical procedures to assess antibody reactivity.
  • Employed competitive assays to confirm reaction specificity.

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  • Applied capture bridge techniques to identify simultaneous binding to multiple antigens.

    • Main Results:

    • A significant majority of human monoclonal IgM antibodies (15/24) demonstrated binding to multiple antigens, including DNA, keratin, tetanus toxin, and ricin.
    • Human IgG antibodies also exhibited multireactivity, but to a lesser extent, binding to a smaller range of antigens (5-6 out of 53).
    • Competitive assays confirmed the specificity of these reactions, and capture bridge techniques revealed simultaneous binding to two antigens in some cases.

    Conclusions:

    • Human monoclonal IgM antibodies frequently display polyreactivity, binding to a wide array of antigens.
    • While human IgG antibodies can be multireactive, their antigen-binding repertoire is considerably more restricted compared to IgM antibodies.
    • These findings have implications for understanding natural antibody repertoires and developing targeted immunotherapies.