Epitopes described in "Activation of OX40 prolongs and exacerbates autoimmune experimental uveitis."

Article Authors:Xiumei Wu; James T Rosenbaum; Grazyna Adamus; Gary L Zhang; Jie Duan; Andrew Weinberg; Zili Zhang
Article Title:Activation of OX40 prolongs and exacerbates autoimmune experimental uveitis.
Reference Detail
Reference ID:1022570
Abstract:PURPOSE: T cells are essential for the development of autoimmune uveitis. Although the costimulatory molecule OX40 promotes T-cell function and expansion, it is unclear whether OX40 is implicated in ocular inflammation. The purpose of this study was to examine the role of OX40 in uveitis. METHODS: Experimental autoimmune uveitis (EAU) was induced in B10.RIII mice by subcutaneous injection of interphotoreceptor retinoid-binding protein peptide 161-180 (IRBP(161-180)). Some mice received an intravenous administration of OX40-activating antibody on days 0 and 4 after IRBP(161-180) sensitization or on days 10 and 14 of uveitis onset. The severity of EAU was evaluated by histology at different time points. In addition, ocular inflammatory cytokine expression was determined by real time-PCR, and peripheral activated CD4(+)CD44(+)CD62L(-) T cells and IL-7R expression were analyzed by flow cytometry. The activated CD4(+)CD44(+) lymphocytes were rechallenged with IRBP(161-180) in vitro to assess their antigen recall response. RESULTS: The authors demonstrated a marked OX40 expression by infiltrating lymphocytes in enucleated human eyes with end-stage inflammation. In addition, the administration of OX40-activating antibody prolonged and exacerbated the disease course of EAU. Moreover, activation of OX40 not only increased CD4(+)CD44(+)CD62L(-) lymphocyte number, it upregulated IL-7R expression in the activated T-cell population. Lastly, these cells exhibited a stronger interferon- response to IRBP(161-180) restimulation in vitro. CONCLUSIONS: The results reveal a pathogenic role of OX40 in uveitis. Furthermore, the upregulation of IL-7R in CD4(+)CD44(+) lymphocytes suggests that the activation of OX40 promotes the generation or expansion of uveitogenic memory T cells.
Affiliations:Department of Pediatrics, Oregon Health & Science University, Portland, OR 97239, USA.
Reference Type:Literature
PubMed ID:21948545
Journal:Invest Ophthalmol Vis Sci
Journal Volume:52
Article Pages:8520-6
Journal ISSN:0146-0404
Article Chemical List:BCL6 protein, human;DNA-Binding Proteins;Eye Proteins;Receptors, Interleukin-7;Receptors, OX40;Retinol-Binding Proteins;TNFRSF4 protein, human;Tnfrsf4 protein, mouse;interleukin-7 receptor, alpha chain;interstitial retinol-binding protein
Article MeSH List:Adult; Aged; Animals; Autoimmune Diseases(etiology; immunology; pathology); CD4-Positive T-Lymphocytes(immunology); Cell Culture Techniques; DNA-Binding Proteins(metabolism); Disease Models, Animal; Enzyme-Linked Immunosorbent Assay; Eye Proteins; Female; Flow Cytometry; Humans; Immunoenzyme Techniques; Lymphocyte Activation(physiology); Lymphocyte Count; Male; Mice; Middle Aged; Real-Time Polymerase Chain Reaction; Receptors, Interleukin-7(metabolism); Receptors, OX40(physiology); Retinol-Binding Proteins; Up-Regulation; Uveitis(etiology; immunology; pathology)
Curation Last Updated:2015-06-07 20:07:35