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Related Experiment Videos

Stability of DNA/ANTI-DNA complexes. IV. Complement fixation

S E Pedersen, R P Taylor, K W Morley

    Journal of Immunological Methods
    |January 1, 1980
    PubMed
    Summary
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    This study introduces a new assay for studying complement fixation in systemic lupus erythematosus (SLE) by measuring antibody/dsDNA immune complexes. The findings reveal that multiple antibody bindings and high avidity are crucial for complement fixation, impacting SLE pathogenesis.

    Area of Science:

    • Immunology
    • Molecular Biology
    • Rheumatology

    Background:

    • Antibody/dsDNA immune complexes are central to systemic lupus erythematosus (SLE) pathogenesis.
    • Complement fixation by these complexes contributes to tissue damage in SLE.

    Purpose of the Study:

    • To develop and validate an in vitro assay for quantifying complement fixation by antibody/dsDNA immune complexes.
    • To investigate the characteristics of anti-dsDNA antibodies involved in complement fixation.

    Main Methods:

    • An in vitro assay was developed using radiolabeled dsDNA and red blood cells to measure immune complex binding via C3b complement component receptor.
    • The assay's performance was compared to the Farr assay, assessing antibody/dsDNA ratios and complex stability.
    • A double-label assay using [3H]- and [14C]-dsDNA was employed to evaluate the influence of mixing order on complement fixation.

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    Main Results:

    • Complement fixation requires multiple antibody bindings to dsDNA.
    • A significant proportion of complement-fixing anti-dsDNA antibodies exhibit high avidity.
    • The order of addition of dsDNA isotopes to SLE serum significantly impacts complement fixation efficiency.

    Conclusions:

    • The developed assay provides a novel method for studying complement fixation in SLE.
    • High avidity and multiple antibody bindings are key factors for complement activation by immune complexes.
    • The kinetics of immune complex formation, influenced by antibody availability and binding order, play a critical role in complement fixation and potentially SLE pathogenesis.