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- W2128606491 abstract "Toll-like receptors (TLR) 2, TLR4 and TLR5 are primary mucosal sensors of microbial patterns. Dissection of the cross-talk between TLRs in intestinal cells has thus far been hampered by the lack of functional TLR2 and TLR4 in in vitro model systems. Here we report that the mouse intestinal epithelial cell line mICcl2 expresses these TLRs and that receptor expression and function are regulated by environmental TLR stimuli. Our results show that stimulation of TLR5 by bacterial flagellin resulted in upregulated TLR2 and TLR4 mRNA and concomitant sensitization of the cells for subsequent TLR2 (Pam3CSK4) and TLR4 (LPS) stimulation. Exposure to low amounts of either Pam3CSK4 or LPS in turn downregulated TLR5 mRNA and attenuated subsequent flagellin-mediated NF-κB activation, pointing to a negative feedback mechanism. Pam3CSK4 and LPS also downregulated TLR4 mRNA but upregulated TLR2 mRNA and sensitized cells for subsequent TLR2 stimulation. Inhibition of the phosphatidyl-inositol-3-kinase/Akt pathway only affected LPS-mediated TLR cross-talk indicating that differential TLR cross-regulation was conferred via different mechanisms. Together, our results demonstrate that the expression and function of TLR in intestinal cells are highly dynamic and tightly regulated in response to encountered bacterial stimuli." @default.
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- W2128606491 date "2007-07-01" @default.
- W2128606491 modified "2023-10-14" @default.
- W2128606491 title "Ligand-induced differential cross-regulation of Toll-like receptors 2, 4 and 5 in intestinal epithelial cells" @default.
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- W2128606491 doi "https://doi.org/10.1016/j.molimm.2007.04.001" @default.
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