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Human platelet-immune complex interaction in plasma

W F Clark, G J Tevaarwerk, B D Reid

    The Journal of Laboratory and Clinical Medicine
    |December 1, 1982
    PubMed
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    In systemic lupus erythematosus (SLE), insoluble DNA-anti-DNA immune complexes activate human platelets, causing aggregation and release. This process involves the platelet Fc-receptor and is key to understanding SLE pathogenesis.

    Area of Science:

    • Immunology
    • Rheumatology
    • Cell Biology

    Background:

    • Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by the presence of anti-DNA antibodies.
    • Immune complexes (ICs) play a central role in SLE pathogenesis, but their direct effects on platelet function are not fully understood.

    Purpose of the Study:

    • To investigate the impact of DNA-anti-DNA immune complexes on human platelet aggregation and release.
    • To elucidate the mechanism by which immune complexes interact with platelets, specifically involving the Fc-receptor.

    Main Methods:

    • Analysis of anti-DNA antibody populations in SLE patient plasma.
    • Formation and characterization of precipitating (insoluble) and soluble DNA-anti-DNA immune complexes.
    • Incubation of human platelets with immune complexes and assessment of aggregation and release.

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  • Investigation of Fc-receptor involvement using Fc-fragments and blocking agents.

    • Main Results:

    • Insoluble DNA-anti-DNA immune complexes induced significant platelet aggregation and release.
    • Platelet activation correlated positively with insoluble IC formation, not soluble ICs.
    • Soluble ICs and Fc-fragments inhibited the release reaction, suggesting competition for Fc-receptors.
    • Blocking Fc-pieces of insoluble ICs inhibited release, confirming Fc-receptor mediation.

    Conclusions:

    • Insoluble DNA-anti-DNA immune complexes activate human platelets via the platelet Fc-receptor.
    • This interaction leads to platelet aggregation and release, contributing to SLE pathophysiology.
    • Antibody conformational changes upon antigen binding may enhance Fc-receptor interaction.