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Tgf-β1 Inhibits Cftr Biogenesis and Prevents Functional Rescue of ΔF508-Cftr in Primary Differentiated Human Bronchial Epithelial Cells

Snodgrass, SM and Cihil, KM and Cornuet, PK and Myerburg, MM and Swiatecka-Urban, A (2013) Tgf-β1 Inhibits Cftr Biogenesis and Prevents Functional Rescue of ΔF508-Cftr in Primary Differentiated Human Bronchial Epithelial Cells. PLoS ONE, 8 (5).

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Abstract

CFTR is an integral transmembrane glycoprotein and a cAMP-activated Cl- channel. Mutations in the CFTR gene lead to Cystic Fibrosis (CF)-an autosomal recessive disease with majority of the morbidity and mortality resulting from airway infection, inflammation, and fibrosis. The most common disease-associated mutation in the CFTR gene-deletion of Phe508 (ΔF508) leads to a biosynthetic processing defect of CFTR. Correction of the defect and delivery of ΔF508-CFTR to the cell surface has been highly anticipated as a disease modifying therapy. Compared to promising results in cultured cell this approach was much less effective in CF patients in an early clinical trial. Although the cause of failure to rescue ΔF508-CFTR in the clinical trial has not been determined, presence of factor(s) that interfere with the rescue in vivo could be considered. The cytokine TGF-β1 is frequently elevated in CF patients. TGF-β1 has pleiotropic effects in different disease models and genetic backgrounds and little is known about TGF-β1 effects on CFTR in human airway epithelial cells. Moreover, there are no published studies examining TGF-β1 effects on the functional rescue of ΔF508-CFTR. Here we found that TGF-β1 inhibits CFTR biogenesis by reducing mRNA levels and protein abundance in primary differentiated human bronchial epithelial (HBE) cells from non-CF individuals. TGF-β1 inhibits CFTR biogenesis without compromising the epithelial phenotype or integrity of HBE cells. TGF-β1 also inhibits biogenesis and impairs the functional rescue of ΔF508-CFTR in HBE cells from patients homozygous for the ΔF508 mutation. Our data indicate that activation of TGF-β1 signaling may inhibit CFTR function in non-CF individuals and may interfere with therapies directed at correcting the processing defect of ΔF508-CFTR in CF patients. © 2013 Snodgrass et al.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Snodgrass, SM
Cihil, KMkmc35@pitt.eduKMC35
Cornuet, PKpcornuet@pitt.eduPCORNUET
Myerburg, MMmmmst40@pitt.eduMMMST40
Swiatecka-Urban, Aasurban@pitt.eduASURBAN
Contributors:
ContributionContributors NameEmailPitt UsernameORCID
EditorHartl, DominikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date: 9 May 2013
Date Type: Publication
Journal or Publication Title: PLoS ONE
Volume: 8
Number: 5
DOI or Unique Handle: 10.1371/journal.pone.0063167
Schools and Programs: School of Medicine > Cell Biology and Molecular Physiology
School of Medicine > Medicine
Refereed: Yes
Date Deposited: 12 Jun 2013 20:57
Last Modified: 27 Nov 2018 03:55
URI: http://d-scholarship.pitt.edu/id/eprint/18839

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