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Human S-antigen determinant recognition in uveitis
M D de Smet1, G Bitar, S Mainigi
1Department of Ophthalmology, Rm. G2-217, Academic Medical Center, University of Amsterdam, Meibergdreef 9, Amsterdam 1105AZ, The Netherlands. m.d.desmet@amc.uva.nl
Investigative Ophthalmology & Visual Science
|December 1, 2001
Summary
Specific immune responses to human soluble antigen (S-Ag) were identified in uveitis patients. While some key determinants exist, individual responses can spread to multiple S-Ag regions, especially in chronic disease.
Area of Science:
- Ocular immunology
- Autoimmune diseases
- Protein biochemistry
Background:
- Soluble antigen (S-Ag) is a retinal antigen from the arrestin protein family.
- It is implicated in ocular inflammatory diseases like experimental autoimmune uveitis (EAU).
- Understanding S-Ag's immunogenic targets is crucial for diagnosing and treating uveitis.
Purpose of the Study:
- To identify human S-Ag immunogenic determinants.
- To investigate if specific immune response profiles correlate with ocular inflammatory conditions.
- To analyze S-Ag determinant spread in uveitis patients.
Main Methods:
- Peripheral blood lymphocyte proliferation assays were used.
- Responses were measured against 40 overlapping synthetic peptides of human S-Ag.
- Patients with Behçet disease, sarcoidosis, Vogt-Koyanagi-Harada, and sympathetic ophthalmia were compared to controls.
Main Results:
- Specific immunodominant S-Ag determinants were found in Behçet disease and sarcoidosis.
- These determinants were located in regions with low homology to other arrestins.
- Determinant spread, indicating broader immune responses, was observed in most uveitis types, except sympathetic ophthalmia.
Conclusions:
- Certain S-Ag determinants are specifically targeted in some uveitis forms.
- Individual patient responses can involve multiple S-Ag determinants.
- Immune responses to S-Ag tend to spread across various determinants in chronic uveitis stages.