Abstract:
BACKGROUND:Bronchiectasis is defined as a permanent dilation of the airways arising from chronic bronchial inflammation/infection. In 50% of cases, no etiology can be identified. Recently, the role of the epithelial sodium channel ENaC has been pointed out in the pathophysiology of cystic fibrosis, a disease due to mutations in the CFTR gene and causing bronchiectasis in the airways. Moreover, it was found that transgenic mice overexpressing ENaCbeta present cystic fibrosis-like lung disease symptoms. Our aim was to evaluate if a defective ENaC protein could be involved in the development of bronchiectasis. METHODS:We extensively analysed ENaCbeta and gamma genes in 55 patients with idiopathic bronchiectasis and without two mutations in the coding regions of CFTR. Thirty-eight patients presented functional abnormalities suggesting impaired sodium transport (abnormal sweat chloride concentration or nasal potential difference measurement), and 17 had no such evidence. RESULTS:Sequencing of the exons and flanking introns of the ENaCbeta and gamma gene identified five different amino-acid changes (p.Ser82Cys, p.Pro369Thr, p.Asn288Ser in ENaCbeta ; and p.Gly183Ser, p.Glu197Lys in ENaCgamma) in heterozygous state in 8 patients. The p.Ser82Cys amino-acid change was found in 3 unrelated patients who were also heterozygous for a CFTR mutation or variant (1 p.F508del, 1 IVS8-5T, and 1 IVS8-5T:1716G>A (p.E528E)). The other mutations were found in patients without CFTR mutation, the p.Glu197Lys mutation in 2 patients and the other variants in single patients. Among the 8 patients bearing an ENaC mutation, 5 had functional abnormalities suggesting impaired sodium transport. CONCLUSION:Our results suggest that several variants in ENaCbeta and gamma genes might be deleterious for ENaC function and lead to bronchiectasis, especially in patients who are trans-heterozygotes for ENaCbeta/CFTR mutations or variants.
journal_name
Respir Resjournal_title
Respiratory researchauthors
Fajac I,Viel M,Sublemontier S,Hubert D,Bienvenu Tdoi
10.1186/1465-9921-9-46subject
Has Abstractpub_date
2008-05-28 00:00:00pages
46eissn
1465-9921issn
1465-993Xpii
1465-9921-9-46journal_volume
9pub_type
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