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• W2007247918 abstract "Clostridium difficile is the leading cause of nosocomial infectious diarrhea. Antibiotic resistance and increased virulence of strains have increased the number of C difficile-related deaths worldwide. The innate host response mechanisms to C difficile are not resolved; we propose that hypoxia-inducible factor (HIF-1) has an innate, protective role in C difficile colitis. We studied the impact of C difficile toxins on the regulation of HIF-1 and evaluated the role of HIF-1alpha in C difficile-mediated injury/inflammation.We assessed HIF-1alpha mRNA and protein levels and DNA binding in human mucosal biopsy samples and Caco-2 cells following exposure to C difficile toxins. We used the mouse ileal loop model of C difficile toxin-induced intestinal injury. Mice with targeted deletion of HIF-1alpha in the intestinal epithelium were used to assess the effects of HIF-1alpha signaling in response to C difficile toxin.Mucosal biopsy specimens and Caco-2 cells exposed to C difficile toxin had a significant increase in HIF-1alpha transcription and protein levels. Toxin-induced DNA binding was also observed in Caco-2 cells. Toxin-induced HIF-1alpha accumulation was attenuated by nitric oxide synthase inhibitors. In vivo deletion of intestinal epithelial HIF-1alpha resulted in more severe, toxin-induced intestinal injury and inflammation. In contrast, stabilization of HIF-1alpha with dimethyloxallyl glycine attenuated toxin-induced injury and inflammation. This was associated with induction of HIF-1-regulated protective factors (such as vascular endothelial growth factor-alpha, CD73, and intestinal trefoil factor) and down-regulation of proinflammatory molecules such as tumor necrosis factor and Cxcl1.HIF-1alpha protects the intestinal mucosa from C difficile toxins. The innate protective actions of HIF-1alpha in response to C difficile toxins be developed as therapeutics for C difficile-associated disease." @default.
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• W2007247918 date "2010-07-01" @default.
• W2007247918 modified "2023-10-07" @default.
• W2007247918 title "Hypoxia-Inducible Factor Signaling Provides Protection in Clostridium difficile-Induced Intestinal Injury" @default.
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• W2007247918 doi "https://doi.org/10.1053/j.gastro.2010.03.045" @default.
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