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- W1876759241 abstract "The role of TNF-alpha in the mucosal inflammation of Crohn's disease has been demonstrated by the prolonged clinical responses and/or remissions among patients receiving i.v. infusion of anti-TNF-alpha. A correlation between TNF-alpha and elevated IFN-gamma production is suggested by the reduction in the number of IFN-gamma producing lamina propria mononuclear cells (LPMC) found in colonic biopsies from anti-TNF-alpha-treated patients. The aim of this study was to define the mechanism of TNF-alpha-augmented mucosal T cell IFN-gamma production. In this paper we present evidence that cultured LPMC secrete a factor which acts on preactivated T cells in concert with TNF-alpha to augment IFN-gamma production. This activity is independent of IL-12 and IL-18, the well-documented potentiators of IFN-gamma expression, and is not produced by PBMC. Peripheral blood PHA-activated T cells incubated in supernatants from LPMC became responsive to TNF-alpha by increasing IFN-gamma output upon stimulation. These results are consistent with a model in which LPMC, but not PBMC, release an unidentified substance when cultured in vitro with low dose IL-2. This substance can act on preactivated peripheral T cells, as well as on lamina propria T cells, conditioning them to respond to TNF-alpha by increased IFN-gamma secretion upon stimulation. Expression of this factor in the gut mucosa could contribute to up-regulation of the Th1 response in the presence of TNF-alpha, and could be important for mucosal immunoregulation." @default.
- W1876759241 created "2016-06-24" @default.
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- W1876759241 date "1999-10-15" @default.
- W1876759241 modified "2023-09-23" @default.
- W1876759241 title "A soluble factor produced by lamina propria mononuclear cells is required for TNF-alpha enhancement of IFN-gamma production by T cells." @default.
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