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[Role of immune complexes in thyroid diseases]
Biulleten' Eksperimental'Noi Biologii I Meditsiny
|February 1, 1992
Summary
Thyroid hormone formation is affected by the thyroglobulin-antibody (Tg-Ab) immune complex. In vitro studies show this complex alters iodination, potentially contributing to thyroid disease pathogenesis.
Area of Science:
- Endocrinology
- Immunology
- Biochemistry
Background:
- Thyroid hormone synthesis involves iodination of thyroglobulin (Tg).
- The role of immune complexes, specifically thyroglobulin-antibody (Tg-Ab), in this process is not fully understood.
- Thyroid diseases can involve autoimmune responses against Tg.
Purpose of the Study:
- To investigate the impact of the Tg-Ab immune complex on thyroid hormone formation.
- To compare the in vitro iodination of Tg-Ab immune complexes with intact Tg and antibodies.
Main Methods:
- In vitro iodination of bovine intact Tg, Tg-Ab immune complex, and purified antibodies to Tg.
- Quantification of iodinated products, including monoiodotyrosine (MIT), diiodotyrosine (DIT), and thyroxine (T4) per mole of Tg.
Main Results:
- Iodination of Tg in complex with antibodies (30-40 antibodies/Tg) resulted in sufficient MIT formation.
- A decreased amount of diiodotyrosine (DIT) and thyroxine (T4) was observed in the immune complex.
- An increased MIT fraction suggests additional iodination of the complexed antibodies.
Conclusions:
- The Tg-Ab immune complex formation influences the iodination process during thyroid hormone synthesis.
- These findings suggest a potential mechanism by which Tg-Ab complexes may contribute to the pathogenesis of thyroid diseases.
- Further in vivo studies are warranted to confirm these in vitro observations in patients.