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Type-I interferon receptor deficiency reduces lupus-like disease in NZB mice

Journal of Experimental Medicine, ISSN: 0022-1007, Vol: 197, Issue: 6, Page: 777-788
2003
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Article Description

Indirect evidence suggests that type-I interferons (IFN-(α/Β) play a significant role in the pathogenesis of lupus. To directly examine the contribution of these pleiotropic molecules, we created congenic NZB mice lacking the α-chain of IFN-α/ΒR, the common receptor for the multiple IFN-α/Β species. Compared with littermate controls, homozygous IFN-(α/ΒR-deleted NZB mice had significantly reduced anti-erythrocyte autoantibodies, erythroblastosis, hemolytic anemia, anti-DNA autoantibodies, kidney disease, and mortality. These reductions were intermediate in the heterozygous-deleted mice. The disease - ameliorating effects were accompanied by reductions in splenomegaly and in several immune cell subsets, including B-1 cells, the major producers of anti-erythrocyte autoantibodies. Decreases of B and T cell proliferation in vitro and in vivo, and of dendritic cell maturation and T cell stimulatory activity in vitro were also detected. Absence of signaling through the IFN-α/ΒR, however, did not affect increased basal levels of the IFN-responsive p202 phosphoprotein, encoded by a polymorphic variant of the Ifi202 gene associated with the Nba2 predisposing locus in NZB mice. The data indicate that type-I IFNs are important mediators in the pathogenesis of murine lupus, and that reducing their activity in the human counterpart may be beneficial.

Bibliographic Details

Santiago-Raber, Marie-Laure; Baccala, Roberto; Haraldsson, Katarina M; Choubey, Divaker; Stewart, Timothy A; Kono, Dwight H; Theofilopoulos, Argyrios N

Rockefeller University Press

Medicine; Immunology and Microbiology

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