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• W2095371103 startingPage "e11598" @default.
• W2095371103 abstract "Background Mutation of the cystic fibrosis transmembrane-conductance regulator (CFTR) causes cystic fibrosis (CF) but not all CF aspects can easily be explained by deficient ion transport. CF-inflammation provides one example but its pathogenesis remains controversial. Here, we tested the simple but fundamental hypothesis that wild-type CFTR is needed to suppress NF-κB activity. Methodology/Principal Findings In lung epithelial (H441) and engineered (H57) cell lines; we report that inflammatory markers are significantly suppressed by wild-type CFTR. Transient-transfection of wild-type CFTR into CFTR-naïve H441 cells, dose-dependently down-regulates both basal and Tumour Necrosis Factor-α evoked NF-κB activity when compared to transfection with empty vector alone (p<0.01, n>5). This effect was also observed in CFTR-naïve H57-HeLa cells which stably express a reporter of NF-κB activity, confirming that the CFTR-mediated repression of inflammation was not due to variable reporter gene transfection efficiency. In contrast, H57 cells transfected with a control cyano-fluorescent protein show a significantly elevated basal level of NF-κB activity above control. Initial cell seeding density may be a critical factor in mediating the suppressive effects of CFTR on inflammation as only at a certain density (1×105 cells/well) did we observe the reduction in NF-κB activity. CFTR channel activity may be necessary for this suppression because the CFTR specific inhibitor CFTRinh172 significantly stimulates NF-κB activity by ∼30% in CFTR expressing 16HBE14o− cells whereas pharmacological elevation of cyclic-AMP depresses activity by ∼25% below baseline. Conclusions/Significance These data indicate that CFTR has inherent anti-inflammatory properties. We propose that the hyper-inflammation found in CF may arise as a consequence of disrupted repression of NF-κB signalling which is normally mediated by CFTR. Our data therefore concur with in vivo and in vitro data from Vij and colleagues which highlights CFTR as a suppressor of basal inflammation acting through NF-κB, a central hub in inflammatory signalling." @default.
• W2095371103 created "2016-06-24" @default.
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• W2095371103 date "2010-07-14" @default.
• W2095371103 modified "2023-09-25" @default.
• W2095371103 title "Expression of Wild-Type CFTR Suppresses NF-κB-Driven Inflammatory Signalling" @default.
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• W2095371103 doi "https://doi.org/10.1371/journal.pone.0011598" @default.
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