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Related Experiment Videos

Terminal complement complexes and C1/C1 inhibitor complexes in autoimmune thyroid disease.

A P Weetman1, S B Cohen, D A Oleesky

  • 1Department of Medicine, University of Cambridge Clinical School, England.

Clinical and Experimental Immunology
|July 1, 1989
PubMed
Summary

Complement activation, specifically the membrane attack complex (MAC), plays a role in autoimmune thyroid diseases like Graves

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Area of Science:

  • Immunology
  • Endocrinology
  • Pathogenesis of Autoimmune Diseases

Background:

  • Autoimmune thyroid diseases (AITDs), including Graves' disease and Hashimoto's thyroiditis, are common endocrine disorders.
  • The complement system, a crucial part of innate immunity, has been implicated in various autoimmune conditions.
  • The specific role of complement activation and the terminal complement complex (TCC), particularly the membrane attack complex (MAC), in AITD pathogenesis requires further elucidation.

Purpose of the Study:

  • To investigate the involvement of complement activation and MAC in the pathogenesis of Graves' disease and Hashimoto's thyroiditis.
  • To quantify serum levels of complement activation markers and assess their correlation with disease activity and treatment response.
  • To examine the deposition of TCC in thyroid tissue using immunohistochemistry.

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Main Methods:

  • Measurement of serum concentrations of the C1r-C1s-C1 inhibitor complex (C1/C1-inh) and the terminal complement complex (TCC).
  • Immunohistochemical staining of thyroid tissue with antibodies against TCC neoantigens.
  • Comparison of complement markers between patients with untreated Graves' disease, Hashimoto's thyroiditis, and healthy controls.
  • Assessment of changes in complement markers following carbimazole treatment in Graves' disease patients.

Main Results:

  • Significantly elevated serum C1/C1-inh and TCC levels were observed in untreated Graves' disease patients compared to healthy controls.
  • Carbimazole treatment led to a significant decrease in serum C1/C1-inh and TCC concentrations in Graves' disease patients.
  • Serum TCC concentration was significantly increased in Hashimoto's thyroiditis patients compared to healthy controls.
  • Immunohistochemical staining revealed TCC deposition around thyroid follicles in both Graves' disease and Hashimoto's thyroiditis tissues, but not in normal thyroid tissue.

Conclusions:

  • These findings suggest a significant role for complement activation, particularly the membrane attack complex, in the pathogenesis of autoimmune thyroid diseases.
  • Complement activation markers may serve as potential indicators of disease activity and treatment response in AITDs.
  • Targeting the complement system could represent a novel therapeutic strategy for autoimmune thyroid disorders.