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Departments of
*
Medicine and
Pathology, University of Southern California School of Medicine, Los Angeles, CA 90089; and
Department of Medicine, University of Florida, Gainesville, FL 32610
We have developed novel genetically lupus-prone (NZB x NZW)F1-derived congenic New Zealand mixed (NZM) 2328 lines, which are either Stat4- or Stat6-deficient. Our studies show that the deficiency of Stat4 and Stat6 significantly alters the phenotype of the lupus-like disease in NZM 2328 congenic mice. Specifically, Stat4-deficient NZM mice develop accelerated nephritis and increased mortality in the absence of high levels of autoantibodies including anti-dsDNA Abs, and in the presence of relatively reduced levels of IFN-
. In contrast, Stat6-deficient NZM mice display a significant reduction in incidence of kidney disease, with a dramatic increase in survival, despite the presence of high levels of anti-dsDNA Abs. The lack of correlation between levels of these autoantibodies and kidney disease raises the question of the direct cause-effect relationships between the presence of autoantibodies and kidney disease. Furthermore, these results also question the apparent equation of the effect of Stat deficiency with loss of secretion or response to particular cytokines.
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