Comparative Analysis of the Interphotoreceptor Retinoid Binding ProteinInduced Models of Experimental Autoimmune Uveitis in B10.RIII versus C57BL/6 Mice

Objective: Experimental autoimmune uveitis (EAU) represents autoimmune uveitis in humans, among which B10.RIII and C57BL/6 are the frequently used strains in mice, but to date, no study has been reported to compare EAU disease between the two strains. Here we compared the differences in morphology, pathology, visual function of the retinal inflammation and Th1/Th17 immune responses in the EAU models induced by the interphotoreceptor retinoid binding protein (IRBP) between the B10.RIII and C57BL/6 strains, using fundus and histological examinations, optical coherence tomography, electroretinography and immunoassays. Method: EAU induced in B10.RIII mice exhibited a shortterm severe inflammation with massive ocular infiltrates of inflammatory cells and extensive destruction of the retina that culminated in rapid degeneration of the retina and permanent loss of visual function. In contrast, C57BL/6 mice developed chronic inflammation with recurring and persistent retinitis for several months, highlighting moderate scores of disease severity and visual signal in comparison with those in B10.RIII mice. Consistent with the clinical manifestations, increased Th1/Th17 effector responses were detected in the uveitic eyes of B10.RIII strain than those in C57BL/6 strain. These data demonstrate distinguishing features of retinal inflammation and T-cell immune responses involved in IRBP-induced EAU between B10.RIII and C57BL/6 strains. Conclusion: Our findings suggest that the persistent-recurring EAU model induced in C57BL/6 mice may serve as a better tool to represent distinct aspects of human uveitis. Keywords: Experimental autoimmune uveitis, IRBP, OCT, ERG, Th1/Th17.