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A new perspective of S-antigen from immunochemical analysis
D S Gregerson1, S P Fling, W F Obritsch
1Department of Ophthalmology, University of Minnesota, Minneapolis.
Current Eye Research
|January 1, 1990
Summary
Researchers identified key T cell epitopes in retinal S-antigen responsible for experimental autoimmune uveoretinitis (EAU). These findings help understand autoimmune eye disease mechanisms and potential therapeutic targets.
Area of Science:
- Immunology
- Ophthalmology
- Autoimmunity
Background:
- Retinal S-antigen triggers experimental autoimmune uveoretinitis (EAU), an autoimmune eye disease.
- EAU involves CD4+ T-cells and affects the retina, uveal tract, and pineal gland.
Purpose of the Study:
- To identify specific T cell recognition sites within S-antigen responsible for EAU induction and lymphocyte proliferation.
- To investigate species-specific T cell epitopes within S-antigen.
Main Methods:
- Analysis of amino acid sequences of S-antigen from various species.
- Use of synthetic peptides to map T cell epitopes.
- Preparation and use of uveitogenic T cell lines (R9, R17, R208) against native and peptide fragments of S-antigen.
Main Results:
- T cell epitopes are clustered in six regions, with some exhibiting species-specificity.
- Synthetic peptides inducing EAU did not always elicit proliferation, but adjacent peptides did.
- A new pathogenic site and associated proliferative site were identified in bovine S-antigen residues 343-362.
Conclusions:
- S-antigen contains distinct T cell epitopes responsible for EAU induction, lymphocyte proliferation, and adoptive transfer.
- Understanding these epitopes is crucial for dissecting autoimmune uveoretinitis pathogenesis.