Reduced expression of Tis7/IFRD1 protein in murine and human cystic fibrosis airway epithelial cell models homozygous for the F508del-CFTR mutation

2011 ◽  
Vol 411 (3) ◽  
pp. 471-476 ◽  
Author(s):  
Elise Blanchard ◽  
Solenne Marie ◽  
Laure Riffault ◽  
Monique Bonora ◽  
Olivier Tabary ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Epithelial Cell ◽  
Airway Epithelial Cell ◽  
Airway Epithelial ◽  
Cell Models ◽  
Cystic Fibrosis Airway

scholarly journals Prostasin, a membrane-anchored serine peptidase, regulates sodium currents in JME/CF15 cells, a cystic fibrosis airway epithelial cell line

2004 ◽  
Vol 287 (5) ◽  
pp. L928-L935 ◽  
Author(s):  
Zhenyue Tong ◽  
Beate Illek ◽  
Vikash J. Bhagwandin ◽  
George M. Verghese ◽  
George H. Caughey
Keyword(s):  
Cystic Fibrosis ◽  
Epithelial Cell ◽  
Epithelial Cells ◽  
Airway Epithelial Cell ◽  
Epithelial Cell Line ◽  
Airway Epithelial ◽  
Ussing Chambers ◽  
Serine Peptidase ◽  
Cystic Fibrosis Airway ◽  
Interfering Rna

Prostasin is a tryptic peptidase expressed in prostate, kidney, lung, and airway. Mammalian prostasins are related to Xenopus channel-activating protease, which stimulates epithelial Na+ channel (ENaC) activity in frogs. In human epithelia, prostasin is one of several membrane peptidases proposed to regulate ENaC. This study tests the hypothesis that prostasin can regulate ENaC in cystic fibrosis epithelia in which excessive Na+ uptake contributes to salt and water imbalance. We show that prostasin mRNA and protein are strongly expressed by human airway epithelial cell lines, including immortalized JME/CF15 nasal epithelial cells homozygous for the ΔF508 cystic fibrosis mutation. Epithelial cells transfected with vectors encoding recombinant soluble prostasin secrete active, tryptic peptidase that is highly sensitive to inactivation by aprotinin. When studied as monolayers in Ussing chambers, JME/CF15 cells exhibit amiloride-sensitive, transepithelial Na+ currents that are markedly diminished by aprotinin, suggesting regulation by serine-class peptidases. Overproduction of membrane-anchored prostasin in transfected JME/CF15 cells does not augment Na+ currents, and trypsin-induced increases are small, suggesting that baseline serine peptidase-dependent ENaC activation is maximal in these cells. To probe prostasin’s involvement in basal ENaC activity, we silenced expression of prostasin using short interfering RNA targeting of prostasin mRNA’s 3′-untranslated region. This drops ENaC currents to 26 ± 9% of baseline. These data predict that prostasin is a major regulator of ENaC-mediated Na+ current in ΔF508 cystic fibrosis epithelia and suggest that airway prostasin is a target for therapeutic inhibition to normalize ion current in cystic fibrosis airway.

P133 Impact of specialised pro-resolving lipid mediators on cystic fibrosis airway epithelial cell functions

2021 ◽  
Vol 20 ◽  
pp. S79-S80
Author(s):  
M. Briottet ◽  
L. Medjout ◽  
M. London ◽  
V. Escabasse ◽  
R. Foresti ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Epithelial Cell ◽  
Airway Epithelial Cell ◽  
Lipid Mediators ◽  
Airway Epithelial ◽  
Cell Functions ◽  
Cystic Fibrosis Airway
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