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- W2008954247 abstract "Vibrio cholerae, a noninvasive enteric bacterium, causing inflammatory diarrheal disease cholera, is associated with the secretion of proinflamammatory cytokines including IL-1beta in cultured epithelial cells. Incubation of Int407 with live V. cholerae resulted in increased IL-1beta mRNA expression as early as 2h of infection, reached a peak at approximately 3.5h and decreased thereafter. The identity of the effector molecule(s) is largely unknown. The bacterial culture supernatant showed IL-1beta stimulating activity. An engineered aflagellate V. cholerae flaA mutant (O395FLAN) resulted in highly reduced level of IL-1beta expression in Int407. The crude flagellar protein of V. cholerae as well as recombinant FlaA induced IL-1beta expression in Int407. Infection of Toll-like receptor 5 (TLR5) transfected HeLa cells with O395FLAN showed reduced expression of IL-1beta compared to wild-type. Unlike wild-type V. cholerae, O395FLAN did not activate the NF-kappaB while the recombinant flagellin could activate NF-kappaB. Finally, the mitogen activated protein kinases (ERK1 and 2, p38) were phosphorylated in wild-type and recombinant flagellin treated Int407 cells and inhibition of the p38 and ERK pathways significantly decreased the IL-1beta response induced by wild-type V. cholerae as well as recombinant flagellin. Our data clearly indicate that flagellin of V. cholerae could induce IL-1beta expression by recognizing TLR5 that activate NF-kappaB and MAP kinase in Int407." @default.
- W2008954247 created "2016-06-24" @default.
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- W2008954247 date "2008-06-01" @default.
- W2008954247 modified "2023-10-16" @default.
- W2008954247 title "IL-1β expression in Int407 is induced by flagellin of Vibrio cholerae through TLR5 mediated pathway" @default.
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- W2008954247 doi "https://doi.org/10.1016/j.micpath.2008.01.004" @default.
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