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Related Experiment Videos

Human complement activation by self-associated IgG rheumatoid factors

P B Brown, F A Nardella, M Mannik

    Arthritis and Rheumatism
    |September 1, 1982
    PubMed
    Summary
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    Self-associated IgG rheumatoid factors (IgG-RFs) activate human complement in fluid phase. While less effective than aggregated IgG or immune complexes, this finding is crucial for understanding rheumatoid arthritis pathogenesis.

    Area of Science:

    • Immunology
    • Rheumatology
    • Complement System

    Background:

    • IgG rheumatoid factors (IgG-RFs) are known to self-associate into dimers and polymers.
    • Understanding the interaction of IgG-RFs with the complement system is vital in rheumatoid arthritis (RA).

    Purpose of the Study:

    • To investigate the complement-activating properties of purified, self-associating IgG-RFs.
    • To compare IgG-RF complement utilization with monomeric IgG, aggregated IgG, and immune complexes.

    Main Methods:

    • Purification of IgG-RFs from RA patient plasma using affinity columns and gel filtration.
    • Assessing complement activation by measuring hemolytic activity and C4-deficient serum restoration.
    • Distinguishing Clq binding from complement cascade activation.

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    Main Results:

    • Self-associated IgG-RFs activated the human complement cascade in fluid phase.
    • IgG-RFs were less effective complement activators than heat-aggregated IgG or soluble immune complexes.
    • Monomeric IgG only bound human Clq and did not activate complement cascades.

    Conclusions:

    • Self-associated IgG-RFs can activate the human complement cascade.
    • The complement activation by IgG-RFs is less potent than that of aggregated IgG or immune complexes.
    • These findings contribute to understanding IgG-RF roles in RA pathogenesis.