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Immune regulatory abnormalities produced by procainamide.

K B Miller, D Salem

    The American Journal of Medicine
    |October 1, 1982
    PubMed
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    Procainamide medication enhances immunoglobulin G (IgG) secretion, suggesting increased helper T cell activity contributes to autoantibody production. Impaired suppressor cell function was not observed in patients taking procainamide.

    Area of Science:

    • Immunology
    • Pharmacology
    • Autoimmunity

    Background:

    • The mechanism behind procainamide-induced autoantibody production remains unclear.
    • Procainamide is a medication known to sometimes trigger autoimmune responses.

    Purpose of the Study:

    • To investigate the effects of procainamide on immune system components, specifically suppressor cell function and immunoglobulin G (IgG) secretion.
    • To compare immune responses in patients taking procainamide with those who have spontaneous systemic lupus erythematosus and healthy controls.

    Main Methods:

    • In vitro analysis of suppressor cell function and IgG secretion in 11 patients taking procainamide.
    • Comparison with 15 patients with spontaneous systemic lupus erythematosus and 40 healthy controls.
    • Isolation and functional assessment of T cells from procainamide-treated patients.

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    Main Results:

    • No impairment in suppressor cell function was detected in procainamide-treated patients.
    • Significantly increased in vitro IgG secretion was observed in the procainamide group compared to controls and systemic lupus erythematosus patients.
    • T cells from procainamide users enhanced IgG secretion in normal lymphocytes, correlating with anti-SS DNA antibody titers.

    Conclusions:

    • Procainamide-induced autoantibody production is likely driven by enhanced helper T cell function, not impaired suppressor cell activity.
    • Clinical manifestation of procainamide-induced autoimmunity may necessitate additional genetic or immunologic factors.