Clinical studies on thyroidal autoantibodies.

Area of Science:

• Immunology
• Endocrinology
• Pathology

Background:

• Autoimmune thyroid diseases, including Grave's disease and Hashimoto's thyroiditis, are characterized by the presence of thyroidal autoantibodies.
• Understanding the specific autoantibodies involved is crucial for clarifying the autoimmune mechanisms underlying these conditions.

Purpose of the Study:

• To investigate and differentiate thyroidal autoantibodies in various thyroid conditions, including Grave's disease and Hashimoto's thyroiditis.
• To explore the potential role of specific autoantibodies, such as anti-thyroglobulin and anti-HF antibodies, in the pathogenesis of these diseases.

Main Methods:

• Two tanned red cell hemagglutination tests were employed using refined human thyroglobulin and human thyroidal microsomes as antigens.
• Studies were conducted on patients with Grave's disease, Hashimoto's thyroiditis, simple goiter, primary hypothyroidism, thyroid neoplasia, and healthy subjects.

Main Results:

• Anti-thyroglobulin antibody was frequently detected in Hashimoto's patients.
• Anti-HF antibody, specific to hyperfunctioning thyroidal follicular cells, was frequently found in both Hashimoto's and Grave's patients.
• Thyroidal autoantibody titers were generally low in other thyroid diseases but higher than in healthy subjects, with aging affecting antibody levels in females.

Conclusions:

• The presence of anti-HF antibody in both Hashimoto's and Grave's diseases suggests a shared autoimmune component.
• Findings suggest the potential presence of focal high-columnar and hyperfunctioning thyroidal follicular cells in most Hashimoto's thyroiditis cases.