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• W1490272647 abstract "A dysregulated interaction between intestinal epithelial cells (IEC) and components of innate immunity is a hallmark of inflammatory bowel diseases. Rifaximin is a poorly absorbed oral antimicrobial agent increasingly used in the treatment of inflammatory bowel diseases that has been demonstrated to act as a gut-specific ligand for the human nuclear receptor pregnane-X receptor (PXR). In the present study we investigated, whether activation of PXR in IEC by rifaximin, emanates counter-regulatory signals and modulates the expression of cytokines or chemokines mechanistically involved in dysregulated intestinal immune homeostasis documented in inflammatory bowel diseases. Our results demonstrate that primary IEC express PXR that regulate the pattern of cytokines and chemokines expressed. PXR silencing decreases TGF-β and IP-10 while increases the expression of TNF-α, IL-8, Rantes and increase the production of PGE2. This pattern is further exacerbated by treating anti-PXR siRNA cells with bacterial endotoxin (LPS). Exposure to rifaximin caused a robust attenuation of generation of inflammatory mediators caused by LPS and increased the generation of TGF-β. PXR silencing completely abrogated these anti-inflammatory effects of rifaximin. By Western blot analysis we found that rifaximin abrogates the binding of NF-κB caused by LPS. Finally, exposure of human colon biopsies from inflammatory bowel diseases patients to rifaximin reduced mRNA levels of IL-8, Rantes, MIP-3α and TNFα induced by LPS. Collectively, these data establish that rifaximin exerts counter-regulatory activities at the interface between enteric bacteria and intestinal epithelial cells. The ability of rifaximin to activate PXR contributes to the maintenance of the intestinal immune homeostasis." @default.
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• W1490272647 date "2011-10-01" @default.
• W1490272647 modified "2023-10-16" @default.
• W1490272647 title "Inhibition of NF-κB by a PXR-dependent pathway mediates counter-regulatory activities of rifaximin on innate immunity in intestinal epithelial cells" @default.
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• W1490272647 doi "https://doi.org/10.1016/j.ejphar.2011.06.058" @default.
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