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TNF-TNFR2 interactions promote MHC class II-stimulated alloresponses while TNF-TNFR1 interactions promote MHC class I-stimulated alloresponses. The present studies were designed to evaluate whether TNF-TNFR2 interactions were involved in the in vivo generation of CD4(+) T cell-mediated intestinal graft-versus-host disease (GVHD) in the (C57BL/6J (hereafter called B6) --&gt; B6 x B6.C-H-2(bm12) (bm12))F(1) GVHD model. Briefly, 5 x 10(6) splenic CD4(+) T lymphocytes from B6.TNFR2(-/-) or control B6 mice were transferred with 1--2 x 10(6) T cell-depleted B6 bone marrow cells (BMC) to irradiated MHC class II-disparate (bm12 x B6)F(1) mice. Weight loss, intestinal inflammation, and the surface expression of CD45RB (memory marker) on intestinal and splenic lymphocytes were assessed. IL-2 and IFN-alpha mRNA levels in intestinal lymphocytes were assessed by nuclease protection assays. A significant reduction in weight loss and intestinal inflammation was observed in recipients of the TNFR2(-/-)CD4(+) SpC. Similarly, a significant decrease was noted in T cell numbers and in CD45RB(low) (activated/memory) expression on intestinal but not CD4(+) T cells in recipients of TNFR2(-/-)CD4(+) spleen cells. IL-2 and IFN-alpha mRNA levels were reduced in the intestine in the recipients of TNFR2(-/-) splenic CD4(+) T cells. These results indicate that TNF-TNFR2 interactions are important for the development of intestinal inflammation and activation/differentiation of Th1 cytokine responses by intestinal lymphocytes in MHC class II-disparate GVHD while playing an insignificant role in donor T cell activation in the spleen.

the journal of immunology/the journal of immunology

TNF-TNFR2 Interactions Are Critical for the Development of Intestinal Graft-Versus-Host Disease in MHC Class II-Disparate (C57BL/6J→C57BL/6J × bm12)F1 Mice