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Respiratory Research
Published in: Respiratory Research 1/2005

Open Access 01-12-2005 | Research

Modulation of epithelial sodium channel (ENaC) expression in mouse lung infected with Pseudomonas aeruginosa

Authors: André Dagenais, Diane Gosselin, Claudine Guilbault, Danuta Radzioch, Yves Berthiaume

Published in: Respiratory Research | Issue 1/2005

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Abstract

Background

The intratracheal instillation of Pseudomonas aeruginosa entrapped in agar beads in the mouse lung leads to chronic lung infection in susceptible mouse strains. As the infection generates a strong inflammatory response with some lung edema, we tested if it could modulate the expression of genes involved in lung liquid clearance, such as the α, β and γ subunits of the epithelial sodium channel (ENaC) and the catalytic subunit of Na+-K+-ATPase.

Methods

Pseudomonas aeruginosa entrapped in agar beads were instilled in the lung of resistant (BalB/c) and susceptible (DBA/2, C57BL/6 and A/J) mouse strains. The mRNA expression of ENaC and Na+-K+-ATPase subunits was tested in the lung by Northern blot following a 3 hours to 14 days infection.

Results

The infection of the different mouse strains evoked regulation of α and β ENaC mRNA. Following Pseudomonas instillation, the expression of αENaC mRNA decreased to a median of 43% on days 3 and 7 after infection and was still decreased to a median of 45% 14 days after infection (p < 0.05). The relative expression of βENaC mRNA was transiently increased to a median of 241%, 24 h post-infection before decreasing to a median of 43% and 54% of control on days 3 and 7 post-infection (p < 0.05). No significant modulation of γENaC mRNA was detected although the general pattern of expression of the subunit was similar to α and β subunits. No modulation of α1Na+-K+-ATPase mRNA, the catalytic subunit of the sodium pump, was recorded. The distinctive expression profiles of the three subunits were not different, between the susceptible and resistant mouse strains.

Conclusions

These results show that Pseudomonas infection, by modulating ENaC subunit expression, could influence edema formation and clearance in infected lungs.
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Metadata
Title
Modulation of epithelial sodium channel (ENaC) expression in mouse lung infected with Pseudomonas aeruginosa
Authors
André Dagenais
Diane Gosselin
Claudine Guilbault
Danuta Radzioch
Yves Berthiaume
Publication date
01-12-2005
Publisher
BioMed Central
Published in
Respiratory Research / Issue 1/2005
Electronic ISSN: 1465-993X
DOI
https://doi.org/10.1186/1465-9921-6-2

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