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The role of complement in the pathogenesis of postpartum thyroiditis
1Department of Medicine, University of Wales College of Medicine, Heath Park, Cardiff.
The Journal of Clinical Endocrinology and Metabolism
|August 1, 1994
Summary
Postpartum thyroiditis involves thyroid peroxidase antibodies (TPO Abs) activating complement. This complement fixation is a marker for thyroid dysfunction in women with TPO Abs.
Area of Science:
- Immunology
- Endocrinology
- Pathogenesis of Autoimmune Diseases
Background:
- Postpartum thyroiditis (PPT) affects women with elevated thyroid autoantibodies.
- Similarities exist between PPT and Hashimoto's thyroiditis, prompting investigation into complement's role.
Purpose of the Study:
- To investigate the pathogenic role of complement activation in postpartum thyroiditis.
- To compare complement fixation and activation levels in women with and without PPT.
Main Methods:
- Measurement of complement fixation by thyroid peroxidase antibodies (TPO Abs) in serum.
- Enzyme-linked immunosorbent assay (ELISA) to measure complement C3 activation.
- Comparison of these markers in euthyroid TPO Ab-positive women, women with PPT, and TPO Ab-negative controls.
Main Results:
- Women with PPT showed significantly greater TPO Ab-related complement activation throughout the postpartum year compared to euthyroid controls.
- Bioactive TPO Ab levels in PPT patients were comparable to those seen in Hashimoto's thyroiditis.
- No complement interaction was observed in TPO Ab-negative control women.
Conclusions:
- TPO Ab-driven complement fixation serves as a marker for thyroid dysfunction in postpartum women with TPO Abs.
- The findings suggest similar pathological mechanisms between PPT and Hashimoto's thyroiditis.
- Complement activation plays a significant role in the pathogenesis of postpartum thyroiditis.