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• W2487525155 abstract "Barrier dysfunction is a characteristic of the inflammatory bowel diseases (IBD), Crohn's disease and ulcerative colitis. Understanding how the tight junction is modified to maintain barrier function may provide avenues for treatment of IBD. We have previously shown that the apical addition of serine proteases to intestinal epithelial cell lines causes a rapid and sustained increase in transepithelial electrical resistance (TER), but the mechanisms are unknown. We hypothesized that serine proteases increase barrier function through trafficking and insertion of tight junction proteins into the membrane, and this could enhance recovery of a disrupted monolayer after calcium switch or cytokine treatment. In the canine epithelial cell line, SCBN, we showed that matriptase, an endogenous serine protease, could potently increase TER. Using detergent solubility-based cell fractionation, we found that neither trypsin nor matriptase treatment changed levels of tight junction proteins at the membrane. In a fast calcium switch assay, serine proteases did not enhance the rate of recovery of the junction. In addition, serine proteases could not reverse barrier disruption induced by IFNγ and TNFα. We knocked down occludin in our cells using siRNA and found this prevented the serine protease-induced increase in TER. Using fluorescence recovery after photobleaching (FRAP), we found serine proteases induce a greater mobile fraction of occludin in the membrane. These data suggest that a functional tight junction is needed for serine proteases to have an effect on TER, and that occludin is a crucial tight junction protein in this mechanism." @default.
• W2487525155 created "2016-08-23" @default.
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• W2487525155 date "2016-09-01" @default.
• W2487525155 modified "2023-10-10" @default.
• W2487525155 title "The serine protease-mediated increase in intestinal epithelial barrier function is dependent on occludin and requires an intact tight junction" @default.
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• W2487525155 doi "https://doi.org/10.1152/ajpgi.00441.2015" @default.
• W2487525155 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5076006" @default.
• W2487525155 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27492333" @default.
• W2487525155 hasPublicationYear "2016" @default.
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