PMID: 9547334May 23, 1998Paper

T cell-mediated pathology in two models of experimental colitis depends predominantly on the interleukin 12/Signal transducer and activator of transcription (Stat)-4 pathway, but is not conditional on interferon gamma expression by T cells

The Journal of Experimental Medicine
S J SimpsonC Terhorst

Abstract

The requirements for interleukin (IL)-12/signal transducer and activator of transcription (Stat)-4 signaling and induction of T cell-specific interferon (IFN)-gamma expression in the development of T helper cell (Th)1-type pathology were examined in two different models of experimental colitis. In each model, abnormal reconstitution of the T cell compartment in immunodeficient mice by adoptive cell transfer leads to a wasting syndrome and inflammation of the colon, induced by IFN-gamma and tumor necrosis factor (TNF)-alpha-producing T cells. We show here that treatment with anti-IL-12 antibodies in one of the models, or reconstitution with T cells from Stat-4-deficient (Stat-4(null)) mice in both models resulted in a milder disease in the majority of recipient animals, compared with those that were left untreated or that had been reconstituted with wt cells. Protected mice in each group also harbored lower frequencies of IFN-gamma-producing T cells than did diseased mice, suggesting that effects on wasting and colitis resulted from the attenuation of IFN-gamma expression by T cells. To test whether the development of pathogenic T cells in the two colitis models was directly dependent on T cell-specific IFN-gamma expression, IFN...Continue Reading

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