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- W1997881078 abstract "Conjunctival epithelial cells serve as a first line of defense against pathogens presented to the innate immune system. The inflammatory response to Gram-negative bacteria is initiated by toll-like receptor 4 (TLR4). This study investigated whether a TLR4 ligand induces production of inflammatory cytokines in human conjunctival epithelial cells (HCECs) through nuclear factor kappa-B (NF-kappaB). HCECs were evaluated for TLR4 expression by reverse transcriptase-polymerase chain reaction, Western blot analysis, and flow cytometric analysis. HCECs were stimulated with various concentrations of lipopolysaccharide (LPS) and the innate immune response was quantified by measuring expression of the inflammatory cytokines IL-6 and IL-8. Functional NF-kappaB activation was examined using a luciferase reporter assay. Expression of TLR4-specific mRNA as well as its corresponding protein was observed in HCECs. Surface and intracellular expression of TLR4 was observed in flow cytometric analysis. Incubation of HCECs with LPS led to secretion of IL-6 and IL-8. Blockade of TLR4- and TNFR-associated factor (TRAF) 6 activity abolished LPS-induced inflammatory response in HCECs and incubation of HCECs with LPS led to activation of the NF-kappaB transcription factor. LPS did not enhance the TLR4 expression at both mRNA and protein levels in HCECs. Our results demonstrate that surface expression of TLR4 in HCECs can elicit a TLR4-mediated innate immune response through TRAF6-NF-kappaB and contribute to an inflammatory environment on the ocular surface." @default.
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- W1997881078 date "2009-01-01" @default.
- W1997881078 modified "2023-09-25" @default.
- W1997881078 title "Toll-like receptor 4 initiates an innate immune response to lipopolysaccharide in human conjunctival epithelial cells" @default.
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- W1997881078 doi "https://doi.org/10.1016/j.exer.2008.09.017" @default.
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