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CUTTING EDGE |
-Producing CD4+ T Cells That Respond to Bacterial Antigens1

*
Laboratory of Immunology, I. Medical Clinic, University of Mainz, Mainz, Germany; and
Institute of Pathology, University of Mainz, Mainz, Germany
We generated transgenic mice for STAT-4, a regulatory protein
specifically associated with IL-12 signaling, under the control of a
CMV promoter. These mice expressed strikingly increased nuclear STAT-4
levels in lamina propria CD4+ T lymphocytes upon systemic
administration of dinitrophenyl-keyhole limpet hemocyanin and
developed chronic transmural colitis characterized by infiltrates of
mainly CD4+ T lymphocytes. The latter cells produced
predominantly TNF and IFN-
but not IL-4 upon activation with
CD3/CD28 or autologous bacterial Ags, consistent with a Th1-type
cell response. Furthermore, chronic colitis in STAT-4 transgenic mice
could be adoptively transferred to SCID mice by colonic and splenic
CD4+ T cells that were activated with Ags from autologous
bacterial flora. These data establish a critical molecular signaling
pathway involving STAT-4 for the pathogenesis of chronic intestinal
inflammation, and targeting of this pathway may be relevant for the
treatment of colitis in humans.
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