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• W2890840747 abstract "Abnormal phosphorylation of claudins changes the interaction and aggregation of tight junction proteins, affecting the intestinal epithelial barrier. Selective blockade of transient receptor potential vanilloid 4 (TRPV4) alleviated experimental colitis. Whether TRPV4 affects the intestinal epithelial barrier and the relationship to claudin-7 phosphorylation remain unknown. In the present study, we investigated the TRPV4 expression in human colonic tissues and colonic cells. Using the site-directed mutagenesis approach, we also identified the roles of claudin-7 phosphorylation in the epithelial barrier and the relationship between TRPV4 and claudin-7 phosphorylation. Increased TRPV4 expression was found in the colonic mucosa from IBD patients. In colonic cells, the mutation of claudin-7 at position 204 decreased the TRPV4 expression. Mutation of claudin-7 at position 204 significantly decreased the FD20 permeability in monolayer colonic cells, while mutations of claudin-7 at positions S206 and S207 increased the FD20 permeability. Meanwhile, mutations of claudin-7 at positions S204 and S207 increased the TER in monolayer colonic cells. TRPV4 agonist GSK1016790 A increased the FD20 permeability in the control group, cld7-wild group, cld7-S206A group and cld7-S207 A group, while the TRPV4 antagonist HC067047 decreased the FD20 permeability in the same groups. HC067047 treatment increased the TER in vector cells, cld7-wild cells and cld7-S206 A cells compared to the respective cells in GSK1016790A-treated groups. HC067047 treatment decreased the migration in vector cells, cld7-wild cells and cld7-S206 A cells compared to the respective cells in the GSK1016790A-treated groups. These results indicated that TRPV4 might be a target for the maintenance of the intestinal epithelial barrier and indicated the mechanism involved in the modulation of serine phosphorylated claudin-7." @default.
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• W2890840747 date "2018-12-01" @default.
• W2890840747 modified "2023-09-26" @default.
• W2890840747 title "The effect of serine phosphorylated claudin-7 on the epithelial barrier and the modulation by transient receptor potential vanilloid 4 in human colonic cells" @default.
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• W2890840747 doi "https://doi.org/10.1016/j.biopha.2018.09.070" @default.
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