Regulation of gap junctional communication by a pro-inflammatory cytokine in cystic fibrosis transmembrane conductance regulator-expressing but not cystic fibrosis airway cells

The American Journal of Pathology
M ChansonS Suter

Abstract

Airway inflammation is orchestrated by cell-cell interactions involving soluble mediators and cell adhesion molecules. Alterations in the coordination of the multicellular process of inflammation may play a major role in the chronic lung disease state of cystic fibrosis (CF). The aim of this study was to determine whether direct cell-cell interactions via gap junctional communication is affected during the inflammatory response of the airway epithelium. We have examined the strength of intercellular communication and the activation of nuclear factor-kappaB (NF-kappaB) in normal (non-CF) and CF human airway cell lines stimulated with tumor necrosis factor-alpha (TNF-alpha). TNF-alpha induced maximal translocation of NF-kappaB into the nucleus of non-CF as well as CF airway cells within 20 minutes. In non-CF cells, TNF-alpha progressively decreased the extent of intercellular communication. In contrast, gap junctional communication between CF cells exposed to TNF-alpha remained unaltered. CF results from mutations of the cystic fibrosis transmembrane conductance regulator (CFTR) gene. Interestingly, transfer of wild-type CFTR into CF cells by adenovirus-mediated infection was associated with the recovery of TNF-alpha-induced unco...Continue Reading

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