alexa IFN-gamma mediates crescent formation and cell-mediated immune injury in murine glomerulonephritis.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Data Mining in Genomics & Proteomics

Author(s): Kitching AR, Holdsworth SR, Tipping PG

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Abstract Features of crescentic glomerulonephritis suggest that it results from a T helper 1 (Th1) nephritogenic immune response. Interferon-gamma (IFN-gamma), produced by Th1 cells, is involved in T cell-directed macrophage activation in effector Th1 responses. The hypothesis that endogenous IFN-gamma contributes to the development of crescentic glomerulonephritis was tested by comparing the development of glomerulonephritis (induced by a planted antigen) and immune responses in normal C57BL/6 mice (IFN-gamma +/+) and in mice genetically deficient in IFN-gamma (IFN-gamma -/-). Ten days after the initiation of glomerulonephritis, IFN-gamma -/- mice developed fewer glomerular crescents (5+/-1\% versus 26+/-3\%, P<0.005), less severe glomerular injury, and less renal impairment. Effectors of delayed-type hypersensitivity (CD4+ T cells, macrophages, and fibrin) in glomeruli were reduced in IFN-gamma -/- mice. Skin delayed-type hypersensitivity to sheep globulin was reduced. Total antigen-specific Ig and splenocyte interleukin-2 production were unchanged, but antigen-specific serum IgG2a was reduced. Markers of an antigen-specific Th2 response (serum IgG1, splenocyte interleukin-4) were unchanged. Studies 22 d after the initiation of glomerulonephritis showed that IFN-gamma -/- mice still had fewer crescents (11+/-2\% versus 22+/-3\%, P = 0.02) and glomerular CD4+ T cells and macrophages than IFN-gamma +/+ mice. These studies demonstrate that endogenous IFN-gamma mediates crescentic glomerulonephritis by promoting cell-mediated immune injury. They support the hypothesis that crescentic glomerulonephritis is a manifestation of a Th1 nephritogenic immune response.
This article was published in J Am Soc Nephrol and referenced in Journal of Data Mining in Genomics & Proteomics

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