Abstract
Autoimmune diseases usually follow a relapsing-remitting or a chronic progressive course. To understand the underlying immunopathogenesis we investigated experimental Lewis rat models displaying both disease types, which were only dependent on the autoantigen peptide used for immunization. Retinal S-Antigen-peptide PDSAg induces chronic, monophasic disease, whilst interphotoreceptor retinoid-binding protein (IRBP)-peptide R14 causes a spontaneously relapsing-remitting course. R14-mediated uveitis can be re-induced by immunization; PDSAg-induced disease is even preventable by prior CFA-injection. T cells with different antigen specificities preferentially infiltrate the eyes from different sites, e.g. choroid or retinal vessels, they remain in the retina after resolution of inflammation for many weeks. The major inflammatory cell populations in the eyes during rat uveitis are CD4+ or CD8+ monocytes/macrophages. Chemokine mutants only suppress PDSAg-mediated EAU, while IFN-α-treatment ameliorated R14-, but worsened PDSAg-induced disease. Comparison of T cells revealed upregulated expression of 26 genes related to various signal transduction pathways upstream and downstream of IFN-γ only in T cells causing relapsing EAU. Intraocul...Continue Reading
Citations
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