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Autoallergic reactions induced by procainamide.

E M Tan, R L Rubin

    The Journal of Allergy and Clinical Immunology
    |October 1, 1984
    PubMed
    Summary
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    Procainamide can trigger autoimmune responses, specifically targeting nuclear histones. Slow acetylators develop these antihistone antibodies faster, aiding in early drug-induced lupus diagnosis.

    Area of Science:

    • Immunology
    • Pharmacology
    • Rheumatology

    Background:

    • Procainamide is known to induce autoimmune responses.
    • The induced immune response is specific, targeting nuclear histones.
    • Acetylator phenotype influences the development of these autoantibodies.

    Purpose of the Study:

    • To investigate the role of acetylator phenotypes in procainamide-induced autoimmunity.
    • To determine the specificity of autoantibodies induced by procainamide.
    • To assess the utility of antihistone antibodies in diagnosing drug-induced lupus.

    Main Methods:

    • Observational study analyzing patient data.
    • Measurement of autoantibodies, specifically antihistone antibodies.
    • Categorization of patients based on acetylator phenotype (slow vs. fast).

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    Main Results:

    • Procainamide induces a selective autoimmune response against nuclear histones.
    • Slow acetylators develop antihistone antibodies significantly earlier than fast acetylators.
    • Antihistone antibodies, in the absence of other antinuclear antibodies, are indicative of drug-induced lupus.

    Conclusions:

    • Acetylator phenotype is a critical factor in the timing of procainamide-induced antihistone antibody formation.
    • Detection of antihistone antibodies is a valuable early diagnostic marker for procainamide-induced lupus.
    • Understanding this mechanism aids in the early identification and management of drug-induced autoimmune syndromes.