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This study describes an assay for the detection of cytotoxicity for thyroid cells in serum of patients with autoimmune thyroiditis. Quantitative measurement may be performed by DNA or [3H] leucine incorporation determinations. The cytotoxic effect is localized in the gamma-globulin fraction, and is complement-mediated. It is thyroid specific i.e. it is not observed with fibroblasts and patients with other autoimmune diseases (patients with lupus erythematosis or glomerulonephritis) do not have cytotoxic antibodies directed against thyroid cells. The thyroid cytotoxicity is related to the presence of antimicrosomal antibodies and the effect of circulating antibodies is inhibited by human thyroid peroxidase. These results strengthen the possible implication of circulating antithyroid peroxidase antibodies in thyroid damage observed in autoimmune thyroiditis.
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Wadeleux et al. (1989) studied this question.
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