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- W2117399561 abstract "We measured innate immune responses by primary human tracheal epithelial (HTE) cells grown as confluent, pseudostratified layers during exposure to inflammatory activators on apical vs. basolateral surfaces. Apical Pseudomonas aeruginosa strain PAK (but not flagellin mutant PAK·fliC), flagellin, and flagellin + PAK·fliC activated NF-κB and IL-8 expression and secretion. In contrast, HTE cells were insensitive to LPS compared to flagellin. Flagellin activated NF-κB in columnar but not basal cells. IL-1β + TNF-α elicited responses similar to those of flagellin. Basolateral flagellin or IL-1β + TNF-α caused 1.5- to 4-fold larger responses, consistent with the fact that NF-κB activation occurred in both columnar and basal cells. MyD88 (toll receptor-associated adapter), IL-1 receptor (IL1R)1, and TNF-α receptor (TNFR)1 were expressed in columnar and basal cells. ZO-1 was localized to tight junctions of columnar cells but not to basal cells. We infer the following. 1) Flagellin is necessary and sufficient to trigger inflammatory responses in columnar cells during accumulation of P. aeruginosa in the airway surface liquid (ASL); columnar cells express toll-like receptor 5 and MyD88, often associated with flagellin-activated cell signaling. 2) IL-1β + TNF-α in the ASL also activate columnar cells, and these cells also express IL1R1 and TNFR1. 3) Apical flagellin, IL-1β, and TNF-α do not activate basal cells because tight junctions between columnar cells prevent access from the apical surface to the basal cells. 4) Exposure of basolateral surfaces to inflammatory activators elicits larger responses because both columnar and basal cells are activated, likely because both cell types express receptors for flagellin, IL-1β, and TNF-α." @default.
- W2117399561 created "2016-06-24" @default.
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- W2117399561 date "2006-03-01" @default.
- W2117399561 modified "2023-10-03" @default.
- W2117399561 title "Innate immune responses of human tracheal epithelium to<i>Pseudomonas aeruginosa</i>flagellin, TNF-α, and IL-1β" @default.
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- W2117399561 doi "https://doi.org/10.1152/ajpcell.00166.2005" @default.
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