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Expression and function of multiple regulators of complement activation in autoimmune thyroid disease
N Tandon1, S L Yan, B P Morgan
1Department of Medicine, University of Sheffield Clinical Sciences Centre, Northern General Hospital, U.K.
Immunology
|April 1, 1994
Summary
Regulators of complement, like CD46 and CD59, influence thyroid cell damage in autoimmune thyroid diseases such as Graves' disease. CD59 showed the greatest impact on protecting thyroid cells from complement-mediated attack.
Area of Science:
- Immunology
- Endocrinology
- Cell Biology
Background:
- Membrane attack complexes (MACs) of complement are implicated in thyroid follicle damage in Graves' disease and Hashimoto's thyroiditis.
- The activity of MACs is regulated by membrane-bound and fluid-phase proteins.
- Understanding these regulators is crucial for autoimmune thyroid disease pathogenesis.
Purpose of the Study:
- To investigate the role of complement regulators in autoimmune thyroid disease.
- To assess the expression and function of specific complement regulatory proteins on thyroid cells.
Main Methods:
- Immunohistochemical staining of thyroid tissue specimens.
- In vitro culture of thyroid cells.
- Assessment of complement-mediated thyroid cell killing with and without blocking regulatory proteins (CD46, CD55, CD59).
Main Results:
- Clusterin and S-protein were detected in Graves' disease thyroid specimens.
- CD46, CD55, and CD59 were expressed on thyroid cells, with CD46 and CD55 expression increasing upon stimulation with IL-1 and IFN-gamma.
- Blocking CD59 significantly enhanced complement-mediated thyroid cell killing, more so than blocking CD46 or CD55.
Conclusions:
- Expression levels of complement regulatory proteins, particularly CD59, may determine the extent of thyroid damage in Graves' disease and Hashimoto's thyroiditis.
- These findings highlight the potential role of complement regulation in the severity of autoimmune thyroid conditions.