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Thyrotropin receptor T cell epitopes in autoimmune thyroid disease
E V Nagy1, J C Morris, H B Burch
1Endocrine-Metabolic Service, Walter Reed Army Medical Center, Washington, DC 20307-5001, USA.
Clinical Immunology and Immunopathology
|May 1, 1995
Summary
Researchers mapped T cell epitopes on the human TSH receptor in Graves' disease. T cells from patients recognized various receptor regions, with dominant epitopes shifting over time.
Area of Science:
- Immunology
- Endocrinology
- Molecular Biology
Background:
- Graves' disease, a hyperthyroid condition, is caused by thyroid-stimulating immunoglobulins targeting the human TSH receptor.
- Understanding T cell epitope distribution is crucial for elucidating autoimmune responses in Graves' disease.
Purpose of the Study:
- To map the distribution of T cell epitopes within the extracellular region of the human TSH receptor.
- To investigate antigen-specific T cell proliferation in patients with Graves' disease.
Main Methods:
- Synthetic peptides spanning the human TSH receptor extracellular region were used.
- In vitro lymphocyte proliferation was assessed via flow cytometry measuring bromodeoxyuridine incorporation.
Main Results:
- T cell proliferation was induced by various TSH receptor regions in 8 of 11 Graves' disease patients.
- No universal stimulatory peptide was identified; epitopes varied among patients.
- The immunodominant epitope shifted from amino acids 271-365 (recent-onset) to 91-215 (long-standing disease).
Conclusions:
- Bromodeoxyuridine incorporation is effective for detecting antigen-induced lymphocyte proliferation.
- TSH receptor-specific T cells in Graves' disease recognize diverse epitopes.
- The immunodominant epitope location appears to change during the course of treated Graves' disease.