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Immunological events leading to destructive thyroiditis in the AUG rat
1Department of Medicine, University of Wales College of Medicine, Cardiff, UK.
Clinical and Experimental Immunology
|September 1, 1988
Summary
Experimental autoimmune thyroid disease (AITD) in rats reveals early immune cell infiltration and Ia expression on thyroid cells, preceding follicular damage. This model closely mimics human Hashimoto
Area of Science:
- Immunology
- Endocrinology
- Pathology
Background:
- Autoimmune thyroid disease (AITD) pathogenesis remains unclear due to limited observational data.
- Experimental models are crucial for understanding the sequence of events in thyroid destruction.
Purpose of the Study:
- To conduct a detailed serial morphological and functional study of experimental AITD (EAITD) in female AUG rats.
- To elucidate the pathogenetic events leading to thyroid cell destruction in a controlled model.
Main Methods:
- Induction of EAITD using thyroglobulin (Tg) in adjuvant.
- Serial monitoring of antibody titers, immune cell infiltration (Ia expression), and thyroid morphology.
- Assessment of serum TSH levels and follicular changes (hyperplasia, necrosis).
Main Results:
- Antibodies to Tg were detected one week post-immunization, followed by Ia-positive vascular endothelium and dendritic-like cells.
- Lymphocytic infiltration, primarily Ia-positive B cells, occurred in animals with high Tg antibody titers.
- Raised serum TSH, follicular hyperplasia, and necrosis were observed, with Ia expression mainly on thyrocytes near lymphoid cells.
Conclusions:
- The immune infiltration in AUG rats resembles Hashimoto's thyroiditis, with differences in epithelial Ia expression.
- The role of diminished or absent epithelial Ia expression in spontaneous disease recovery requires further investigation.