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Evidence for circulating immune complexes in thyroid disease.

E A Calder, W J Penhale, E W Barnes

    British Medical Journal
    |April 6, 1974
    PubMed
    Summary
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    Patients with Hashimoto thyroiditis show higher anti-complementary activity in their sera. This activity, linked to immune complexes, was also observed in other thyroid conditions but less frequently than in Hashimoto thyroiditis.

    Area of Science:

    • Immunology
    • Endocrinology
    • Thyroid Research

    Background:

    • The complement system plays a crucial role in immune responses.
    • Thyroid autoimmune diseases, such as Hashimoto thyroiditis, involve complex immunological mechanisms.
    • Anti-complementary activity in patient sera can indicate underlying immune dysregulation.

    Purpose of the Study:

    • To investigate the prevalence of anti-complementary activity in patients with various thyroid conditions.
    • To characterize the nature of the anti-complementary activity in Hashimoto thyroiditis sera.

    Main Methods:

    • Sera from patients with Hashimoto thyroiditis, primary hypothyroidism, thyrotoxicosis, and healthy controls were analyzed for anti-complementary activity.
    • Sephadex G-200 chromatography was employed to fractionate sera from Hashimoto thyroiditis patients.

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    Main Results:

    • Anti-complementary activity was detected in 59% of Hashimoto thyroiditis patients, 29% of primary hypothyroidism patients, 17% of thyrotoxicosis patients, and 8% of controls.
    • In Hashimoto thyroiditis, the activity was associated with molecular fractions larger than monomeric IgG, suggesting small immune complexes.

    Conclusions:

    • Anti-complementary activity is significantly elevated in patients with Hashimoto thyroiditis.
    • The findings suggest the presence of immune complexes contributing to complement activation in Hashimoto thyroiditis.
    • Further research is warranted to explore the clinical implications of these immune complexes in thyroid disease.