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Immunopathological findings and thyroid autoantibodies in thyroid autonomy
R G Bretzel1, A Platzer, R Schaeffer
1Third Medical Department, Justus-Liebig University, Giessen, FRG.
Acta Medica Austriaca
|January 1, 1990
Summary
Immune responses, including cell infiltration and antigen expression, are common in thyroid autonomy, not just autoimmune thyroid disease. These findings suggest immunopathogenic mechanisms may contribute to thyroid autonomy.
Area of Science:
- Endocrinology
- Immunology
- Pathology
Background:
- Autoimmune thyroid diseases like Graves' and Hashimoto's involve lymphocytic infiltration and altered thyrocyte antigen expression.
- Thyroid autonomy, characterized by autonomous nodules, shares some immunopathological features with autoimmune thyroid diseases.
- Nodular goiters typically lack these specific immunopathological findings.
Purpose of the Study:
- To investigate the presence and significance of immune phenomena in thyroid glands with autonomous nodules.
- To differentiate the immunopathological characteristics of autonomous nodules from those of nodular goiters.
- To explore potential immunopathogenic mechanisms underlying thyroid autonomy.
Main Methods:
- Histopathological examination of thyroid glands.
- Assessment of lymphocytic and macrophagic infiltration.
- Analysis of thyrocyte class I and class II antigen expression.
- Detection of thyroid autoantibodies (microsomal, anti-peroxidase, TSH-receptor).
Main Results:
- Thyroid glands with autonomous nodules frequently exhibited lymphocytic/macrophagic infiltration and increased thyrocyte class I/II antigen expression.
- Nodular goiters generally did not show these immunopathological features.
- Thyroid autoantibodies were detected at low frequencies only in cases with autonomous nodules.
- Increased class I expression on thyrocytes showed a stronger correlation with cell infiltration than increased class II expression.
Conclusions:
- Immune phenomena in thyroid autonomy are unlikely to be a mere consequence of nodular formation; immunopathogenesis may play a role.
- The origin of increased class II expression, if an initial autoimmune event, might stem from non-thyrocyte sources.
- Aberrant thyrocyte class I expression, potentially induced by interferons, is another candidate for initiating autoimmune processes in thyroid autonomy.