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Related Experiment Videos

'In vitro' study of a reaction between the complement system and cellular DNA.

A P Peltier, L Cyna, A Dryll

    Immunology
    |November 1, 1978
    PubMed
    Summary

    The complement system directly reacts with nuclear DNA under physiological conditions. This interaction, involving the classical complement pathway, mimics patterns seen in systemic lupus erythematosus (SLE) patients.

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    Area of Science:

    • Immunology
    • Molecular Biology

    Background:

    • The complement system is a crucial part of innate immunity.
    • Nuclear DNA can be exposed in certain pathological conditions.
    • The interaction between complement and nuclear DNA is not fully understood.

    Purpose of the Study:

    • To investigate the direct interaction between the complement system and nuclear DNA in vitro.
    • To characterize the components of the complement system involved in this reaction.
    • To compare the observed reaction pattern with autoimmune disease markers.

    Main Methods:

    • Indirect immunofluorescence technique.
    • Cryostat-cut rat liver sections as substrate.
    • DNase treatment to confirm DNA dependence.

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    Main Results:

    • Direct reaction between complement and nuclear DNA demonstrated in vitro.
    • Reaction occurs at physiological pH and molarity.
    • The classical complement pathway, including C1q fixation and activation of all components, is involved.
    • DNase treatment abolished the reaction, confirming DNA specificity.
    • Fluorescence patterns resemble those of anti-DNA antibodies in systemic lupus erythematosus (SLE) patients.

    Conclusions:

    • The complement system can directly bind to nuclear DNA.
    • This interaction activates the classical complement pathway.
    • The findings suggest a potential mechanism linking complement activation and nuclear DNA in diseases like SLE.