UNIGE document Scientific Article
previous document  unige:27044  next document
add to browser collection
Title

Defective activation of c-Src in cystic fibrosis airway epithelial cells results in loss of tumor necrosis factor-alpha-induced gap junction regulation

Authors
Thomas, Marc A
Giepmans, Ben N G
Published in Journal of Biological Chemistry. 2003, vol. 278, no. 10, p. 8326-32
Abstract Tumor necrosis factor-alpha (TNF-alpha) signaling is central to the transmission of the innate immune response and subsequent activation of the adaptive immune system. The functioning of both systems is required for optimal clearance of pathogens from the airways. In cystic fibrosis (CF), dysfunction of the CF transmembrane conductance regulator (CFTR) is associated with recurrent pulmonary infections despite an intense inflammatory and immune response. We reported recently that TNF-alpha decreased gap junction connectivity in non-CF airway cells, a mechanism that was absent in CF cells expressing the DeltaPhe-508 mutant of CFTR. We have now identified the tyrosine kinase c-Src as a possible pathway between the mediators of inflammation and the gap junction protein connexin43 (Cx43). Indeed, TNF-alpha increased the proportion of activated c-Src in non-CF airway cells. Moreover, pharmacological antagonists and expression in non-CF cells of a dominant negative construct of c-Src prevented Cx43 channel closure by TNF-alpha. Finally, gap junction channel closure was prevented by expression of a Cx43 mutant lacking tyrosine phosphorylation sites for c-Src. Additional experiments showed that activation of c-Src was defective in CF airway cells but rescued in CFTR-corrected CF cells. These data suggest that CFTR dysfunction is associated with altered TNF-alpha signaling, resulting in the persistence of gap junction connectivity in CF airway cells. We propose that altered regulation of c-Src may contribute to the dysregulated inflammatory response that is characteristic of the CF phenotype.
Keywords Cell LineCystic Fibrosis/metabolismGap Junctions/physiologyHumansProto-Oncogene Proteins pp60(c-src)/metabolismTrachea/metabolismTumor Necrosis Factor-alpha/physiology
Identifiers
PMID: 12506110
Full text
Article (Published version) (276 Kb) - document accessible for UNIGE members only Limited access to UNIGE
Structures
Research group Mucoviscidose et jonctions GAP (229)
Citation
(ISO format)
HUANG, Song et al. Defective activation of c-Src in cystic fibrosis airway epithelial cells results in loss of tumor necrosis factor-alpha-induced gap junction regulation. In: Journal of Biological Chemistry, 2003, vol. 278, n° 10, p. 8326-32. https://archive-ouverte.unige.ch/unige:27044

275 hits

0 download

Update

Deposited on : 2013-03-26

Export document
Format :
Citation style :