Interferon-gamma is required for lupus-like disease and lymphoaccumulation in MRL-lpr mice

The Journal of Clinical Investigation
D BalomenosA N Theofilopoulos

Abstract

Congenic MRL-lpr mice homozygous and heterozygous for the IFN-gamma gene disruption were created to assess the role of this pleotropic cytokine on the lymphoaccumulation and lupus-like disease of Fas-defective mice. Early death was prevented, and glomerulonephritis severely reduced in IFN-gamma-/- mice. Hypergammaglobulinemia was maintained with a switch from IgG2a to IgG1 predominance, but the dramatic decrease in levels of the dominant IgG2a anti-dsDNA autoantibodies was not associated with a compensatory increase in TH2-associated IgG subclasses. Remarkably, early death and glomerulonephritis were also prevented in IFN-gamma+/- mice, although autoantibody levels and glomerular immune deposits were equivalent to IFN-gamma+/+ lpr mice, indicating the importance of additional locally-exerted disease-promoting effects of IFN-gamma. IFN-gamma-/- mice exhibited reduced lymphadenopathy concomitant to a decrease in DN B220(+) T cells. In vivo BrdU labeling showed reduced proliferation of DN B220(+) cells in IFN-gamma-/- vs. IFN-gamma+/+ lpr mice, while enhanced proliferation of all other T cell subsets was unaffected. Macrophages of IFN-gamma-/-lpr mice expressed markedly decreased levels of MHC class I and II molecules compared wit...Continue Reading

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