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• W1970123976 abstract "Background & AimsSignaling via interleukin (IL)-10 or transforming growth factor (TGF)-β is disrupted in subpopulations of patients with inflammatory bowel disease, but it is not clear how a T-helper (Th) 1 cell response is induced. We studied conversion of human mucosal innate immune cells into inflammatory cells and the initiation of a Th1 cell response following loss of IL-10 or TGF-β signaling.MethodsWe depleted IL-10 or TGF-β from explant cultures of human normal colonic mucosa using immunoneutralization. Pharmacologic inhibitors and antibodies were used to determine the factors involved in the initiation of an interferon (IFN)-γ response following loss of TGF-β or IL-10 signaling. Cytokines produced by mucosal cells were assessed by enzyme-linked immunosorbent assay and quantitative reverse-transcriptase polymerase chain reaction. The subsets of cells involved in cytokine production were determined by in situ immunofluorescence analysis and flow cytometry after digestion of the explants with collagenase.ResultsDepletion of IL-10 from human normal colonic mucosa resulted in an IFN-γ response, characterized by early-stage secretion of mature IL-18 and production of the active form of caspase-1 by macrophages and some epithelial cells. A caspase-1 inhibitor or the IL-18 antagonist IL-18–binding protein blocked this response. By contrast, depletion of TGF-β resulted in an IFN-γ response that was preceded by and required secretion of IL-12 from macrophages, dendritic cells, and epithelial cells.ConclusionsInnate immune cells (macrophages and epithelial cells) activate a Th1 cell response in explant cultures of human normal colonic mucosa depleted in IL-10 or TGF-β via distinct, nonredundant pathways. These pathways might contribute to the pathogenesis of inflammatory bowel disease. Signaling via interleukin (IL)-10 or transforming growth factor (TGF)-β is disrupted in subpopulations of patients with inflammatory bowel disease, but it is not clear how a T-helper (Th) 1 cell response is induced. We studied conversion of human mucosal innate immune cells into inflammatory cells and the initiation of a Th1 cell response following loss of IL-10 or TGF-β signaling. We depleted IL-10 or TGF-β from explant cultures of human normal colonic mucosa using immunoneutralization. Pharmacologic inhibitors and antibodies were used to determine the factors involved in the initiation of an interferon (IFN)-γ response following loss of TGF-β or IL-10 signaling. Cytokines produced by mucosal cells were assessed by enzyme-linked immunosorbent assay and quantitative reverse-transcriptase polymerase chain reaction. The subsets of cells involved in cytokine production were determined by in situ immunofluorescence analysis and flow cytometry after digestion of the explants with collagenase. Depletion of IL-10 from human normal colonic mucosa resulted in an IFN-γ response, characterized by early-stage secretion of mature IL-18 and production of the active form of caspase-1 by macrophages and some epithelial cells. A caspase-1 inhibitor or the IL-18 antagonist IL-18–binding protein blocked this response. By contrast, depletion of TGF-β resulted in an IFN-γ response that was preceded by and required secretion of IL-12 from macrophages, dendritic cells, and epithelial cells. Innate immune cells (macrophages and epithelial cells) activate a Th1 cell response in explant cultures of human normal colonic mucosa depleted in IL-10 or TGF-β via distinct, nonredundant pathways. These pathways might contribute to the pathogenesis of inflammatory bowel disease." @default.
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• W1970123976 date "2011-11-01" @default.
• W1970123976 modified "2023-10-17" @default.
• W1970123976 title "Loss of Interleukin-10 or Transforming Growth Factor β Signaling in the Human Colon Initiates a T-Helper 1 Response Via Distinct Pathways" @default.
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• W1970123976 doi "https://doi.org/10.1053/j.gastro.2011.08.002" @default.
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