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

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. 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. 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.

Chen Y ，Chen Z ，Chong WP ，Wu S ，Wang W ，Zhou H ，Chen J ... -  《-》

Comparative analysis of induced vs. spontaneous models of autoimmune uveitis targeting the interphotoreceptor retinoid binding protein.

Chen J ，Qian H ，Horai R ，Chan CC ，Falick Y ，Caspi RR ... -  《PLoS One》

Repertoire analysis and new pathogenic epitopes of IRBP in C57BL/6 (H-2b) and B10.RIII (H-2r) mice.

Cortes LM ，Mattapallil MJ ，Silver PB ，Donoso LA ，Liou GI ，Zhu W ，Chan CC ，Caspi RR ... -  《-》

The requirement for pertussis to induce EAU is strain-dependent: B10.RIII, but not B10.A mice, develop EAU and Th1 responses to IRBP without pertussis treatment.

PURPOSE:Experimental autoimmune uveoretinitis (EAU) in mice is an important model for elucidating basic mechanisms in autoimmune eye disease. The need for pertussis toxin (PTX) as an additional adjuvant to elicit EAU has limited the usefulness of this model in some types of studies by introducing a pleiotropic factor with confounding effects on the immune response. METHODS:In the present study the authors examined the ability of B10.RIII mice, the most susceptible strain known so far, to develop EAU in response to the retinal antigen, interphotoreceptor retinoid-binding protein (IRBP), and to a major uveitogenic epitope of IRBP, peptide (p)161-180, in the absence of PTX treatment. RESULTS:The data indicate that high disease scores in response to IRBP and p161-180 were found in B10.RIII mice, without the need for PTX as part of the immunization protocol. Unlike the B10.A strain in which appreciable disease did not develop without PTX, B10.RIII mice mounted a high IFN-gamma response to IRBP in the absence of PTX treatment. Interestingly, and unlike the effect with IRBP, in vitro recall response to p161-180 was low in IFN-gamma, despite good EAU scores. CONCLUSIONS:The data indicate that an important mechanism through which PTX facilitates induction of cell-mediated autoimmunity is by promoting a Th1 polarization of the immune response. The propensity of B10.RIII mice to mount a more polarized Th1 response to IRBP than other strains may contribute to their ability to develop EAU without pertussis adjuvant. Nevertheless, the induction of EAU by p161-180 in the context of a relatively limited IFN-gamma production indicates that non-Th1- and Th-related mechanisms are likely to act in concert to determine the outcome of disease.

Silver PB ，Chan CC ，Wiggert B ，Caspi RR ... -  《INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE》

Blockade of interleukin-6 signaling suppresses not only th17 but also interphotoreceptor retinoid binding protein-specific Th1 by promoting regulatory T cells in experimental autoimmune uveoretinitis.

Haruta H ，Ohguro N ，Fujimoto M ，Hohki S ，Terabe F ，Serada S ，Nomura S ，Nishida K ，Kishimoto T ，Naka T ... -  《-》