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. 1998 Jun 1;101(11):2598–2605. doi: 10.1172/JCI2865

Activation of NF-kappaB by adherent Pseudomonas aeruginosa in normal and cystic fibrosis respiratory epithelial cells.

E DiMango 1, A J Ratner 1, R Bryan 1, S Tabibi 1, A Prince 1
PMCID: PMC508849  PMID: 9616231

Abstract

PMN-dominated airway inflammation is a major component of cystic fibrosis (CF) lung disease. Epithelial cells respond to organisms such as Pseudomonas aeruginosa, the major pathogen in CF, by expressing the leukocyte chemokine IL-8. Experiments were performed using several different types of respiratory epithelial cells that demonstrate that ligation of ceramide-associated receptors on epithelial surfaces by P. aeruginosa pili is a major stimulus for the translocation of transcription factor nuclear factor (NF)-kappaB and initiation of IL-8 expression by epithelial cells. Using electrophoretic mobility shift assays and Western hybridizations, nuclear NF-kappaB was found shortly after epithelial cells were stimulated by either whole organisms, isolated pili, or antibody to the pilin receptor asialoGM1. IB3 cells, which express mutations in cystic fibrosis transmembrane conductance regulator (CFTR) (DeltaF508/W1282X), were noted to have significantly greater amounts of endogenous nuclear NF-kappaB, but not the transcription factor C/EBP, than CF cells corrected by episomal copies of normal CFTR (C-38) or IB3 cells grown at a permissive temperature (25 degreesC). Activation of NF-kappaB and subsequent IL-8 expression in epithelial cells can result from activation of at least two pathways: an exogenous signaling cascade that is activated by ligation of ceramide-associated adhesins such as P. aeruginosa pilin, or endogenous stimulation, suggested to be a consequence of cell stress caused by the accumulation of mutant CFTR in the endoplasmic reticulum.

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Selected References

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