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Related Experiment Videos

Human IgM antibodies do not activate guinea-pig complement after interaction with soluble antigen.

J S van der Zee, E C Beuvery, R van Ree

    Molecular Immunology
    |June 1, 1986
    PubMed
    Summary

    Human IgM antibodies activate human complement but not guinea-pig complement with soluble antigens. However, both complements are activated when the antigen is particulate, highlighting antigen form

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    Area of Science:

    • Immunology
    • Complement System Biology

    Background:

    • Activation of guinea-pig complement by human IgM antibodies with particulate antigens is a known phenomenon.
    • Human IgM antibodies are crucial in initiating complement responses, particularly against bacterial polysaccharides.

    Purpose of the Study:

    • To investigate the differential activation of human and guinea-pig complement by human IgM antibodies against meningococcal group-C capsular polysaccharide.
    • To determine the influence of antigen form (soluble vs. particulate) on complement activation by human IgM antibodies.

    Main Methods:

    • Utilized classical complement fixation tests.
    • Employed human IgM antibodies targeting meningococcal group-C capsular polysaccharide.
    • Tested both soluble and particulate forms of the antigen with human and guinea-pig complement systems.

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    Main Results:

    • Human IgM antibodies readily activated human complement with soluble meningococcal antigen.
    • The same antibodies failed to activate guinea-pig complement with soluble antigen, a finding consistent across different antigen systems.
    • Efficient activation of both human and guinea-pig complement occurred when the antigen was in a particulate form.

    Conclusions:

    • Antigen form critically influences the ability of human IgM antibodies to activate different complement species.
    • Human IgM antibodies exhibit species-specific complement activation patterns depending on antigen presentation.
    • The study reveals a distinction in how soluble versus particulate antigens engage the complement system via human IgM.