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[Direct reaction between complement system and cell nuclei (author's transl)].

A P Peltier, L Cyna, L C Solal

    Annales D'Immunologie
    |February 1, 1975
    PubMed
    Summary
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    The complement system directly binds to human and rat cell nuclei in vitro. This interaction activates the classical complement pathway up to the C3 step, suggesting potential physiological relevance.

    Area of Science:

    • Immunology and Molecular Biology
    • Cellular and Molecular Medicine

    Context:

    • The complement system is a critical part of innate immunity.
    • Nuclear components can trigger immune responses.
    • Previous understanding of complement activation by cell nuclei was limited.

    Purpose:

    • To investigate the direct interaction between the complement system and cell nuclei in vitro.
    • To elucidate the specific steps of complement activation initiated by nuclear DNA.
    • To determine the potential physiological significance of this interaction.

    Summary:

    • Demonstrated direct in vitro reaction between the complement system and human/rat cell nuclei using indirect immunofluorescence.
    • Identified initial C1q fixation to nuclear DNA, confirmed by DNase sensitivity and peripheral fluorescence.

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  • Showed C1 activation and subsequent C4 fixation, with evidence of classical pathway activation extending to the C3 step using fresh human serum.

    • Impact:

    • Provides evidence for direct complement activation by cell nuclei via the classical pathway.
    • Suggests a potential role for this interaction in physiopathological conditions.
    • Opens avenues for further research into autoimmune diseases involving nuclear antigens.