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The objective of these studies was to examine collagen-induced arthritis (CIA) in C57BL/6 mice transgenic for the rodent complement regulatory protein complement receptor 1-related gene/protein y (Crry) (Crry-Tg), a C3 convertase inhibitor. The scores for clinical disease activity and for histological damage in the joints were both significantly decreased in Crry-Tg mice in comparison to wild-type (WT) littermates. The production of both IgG1 and IgG2a anti-collagen Abs was reduced in the Crry-Tg mice, although spleen cell proliferation in response to collagen type II was not altered. The production of IFN-gamma, TNF-alpha, and IL-1beta by LPS-stimulated spleen cells was decreased, and IL-10 was increased, in cells from Crry-Tg mice in comparison to WT. The steady-state mRNA levels for IFN-gamma, TNF-alpha, and IL-1beta were all decreased in the joints of Crry-Tg mice in comparison to WT. The synovium from Crry-Tg mice without CIA contained the mRNA for the Crry transgene, by RT-PCR, and the synovium from transgenic mice with CIA exhibited little deposition of C3 protein by immunohistological analysis. These results suggest that suppression of CIA in Crry-Tg mice may be due to enhanced synthesis of Crry locally in the joint with decreased production of proinflammatory cytokines.

Prevention of Collagen-Induced Arthritis in Mice Transgenic for the Complement Inhibitor Complement Receptor 1-Related Gene/Protein y