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- W2200999931 abstract "Disruption of epithelial tight junctions (TJ), gut barrier dysfunction and endotoxemia play crucial role in the pathogenesis of alcoholic tissue injury. Occludin, a transmembrane protein of TJ, is depleted in colon by alcohol. However, it is unknown whether occludin depletion influences alcoholic gut and liver injury. Wild type (WT) and occludin deficient (Ocln−/−) mice were fed 1–6% ethanol in Lieber–DeCarli diet. Gut permeability was measured by vascular-to-luminal flux of FITC-inulin. Junctional integrity was analyzed by confocal microscopy. Liver injury was assessed by plasma transaminase, histopathology and triglyceride analyses. The effect of occludin depletion on acetaldehyde-induced TJ disruption was confirmed in Caco-2 cell monolayers. Ethanol feeding significantly reduced body weight gain in Ocln−/− mice. Ethanol increased inulin permeability in colon of both WT and Ocln−/− mice, but the effect was 4-fold higher in Ocln−/− mice. The gross morphology of colonic mucosa was unaltered, but ethanol disrupted the actin cytoskeleton, induced redistribution of occludin, ZO-1, E-cadherin and β-catenin from the junctions and elevated TLR4, which was more severe in Ocln−/− mice. Occludin knockdown significantly enhanced acetaldehyde-induced TJ disruption and barrier dysfunction in Caco-2 cell monolayers. Ethanol significantly increased liver weight and plasma transaminase activity in Ocln−/− mice, but not in WT mice. Histological analysis indicated more severe lesions and fat deposition in the liver of ethanol-fed Ocln−/− mice. Ethanol-induced elevation of liver triglyceride was also higher in Ocln−/− mice. This study indicates that occludin deficiency increases susceptibility to ethanol-induced colonic mucosal barrier dysfunction and liver damage in mice." @default.
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- W2200999931 date "2016-04-01" @default.
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- W2200999931 title "Occludin deficiency promotes ethanol-induced disruption of colonic epithelial junctions, gut barrier dysfunction and liver damage in mice" @default.
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- W2200999931 doi "https://doi.org/10.1016/j.bbagen.2015.12.013" @default.
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