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Respiratory Research
Published in: Respiratory Research 1/2013

Open Access 01-12-2013 | Research

Genetic replacement of surfactant protein-C reduces respiratory syncytial virus induced lung injury

Authors: Stephan W Glasser, Albert P Senft, Melissa D Maxfield, Teah L Ruetschilling, John E Baatz, Kristen Page, Thomas R Korfhagen

Published in: Respiratory Research | Issue 1/2013

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Abstract

Background

Individuals with deficiencies of pulmonary surfactant protein C (SP-C) develop interstitial lung disease (ILD) that is exacerbated by viral infections including respiratory syncytial virus (RSV). SP-C gene targeted mice (Sftpc -/-) lack SP-C, develop an ILD-like disease and are susceptible to infection with RSV.

Methods

In order to determine requirements for correction of RSV induced injury we have generated compound transgenic mice where SP-C expression can be induced on the Sftpc -/- background (SP-C/Sftpc -/-) by the administration of doxycycline (dox). The pattern of induced SP-C expression was determined by immunohistochemistry and processing by Western blot analysis. Tissue and cellular inflammation was measured following RSV infection and the RSV-induced cytokine response of isolated Sftpc +/+ and -/- type II cells determined.

Results

After 5 days of dox administration transgene SP-C mRNA expression was detected by RT-PCR in the lungs of two independent lines of bitransgenic SP-C/Sftpc -/- mice (lines 55.3 and 54.2). ProSP-C was expressed in the lung, and mature SP-C was detected by Western blot analysis of the lavage fluid from both lines of SP-C/Sftpc -/- mice. Induced SP-C expression was localized to alveolar type II cells by immunostaining with an antibody to proSP-C. Line 55.3 SP-C/Sftpc -/- mice were maintained on or off dox for 7 days and infected with 2.6x107 RSV pfu. On day 3 post RSV infection total inflammatory cell counts were reduced in the lavage of dox treated 55.3 SP-C/Sftpc -/- mice (p = 0.004). The percentage of neutrophils was reduced (p = 0.05). The viral titers of lung homogenates from dox treated 55.3 SP-C/Sftpc -/- mice were decreased relative to 55.3 SP-C/Sftpc -/- mice without dox (p = 0.01). The cytokine response of Sftpc -/- type II cells to RSV was increased over that of Sftpc +/+ cells.

Conclusions

Transgenic restoration of SP-C reduced inflammation and improved viral clearance in the lungs of SP-C deficient mice. The loss of SP-C in alveolar type II cells compromises their response to infection. These findings show that the restoration of SP-C in Sftpc -/- mice in response to RSV infection is a useful model to determine parameters for therapeutic intervention.
Appendix
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Metadata
Title
Genetic replacement of surfactant protein-C reduces respiratory syncytial virus induced lung injury
Authors
Stephan W Glasser
Albert P Senft
Melissa D Maxfield
Teah L Ruetschilling
John E Baatz
Kristen Page
Thomas R Korfhagen
Publication date
01-12-2013
Publisher
BioMed Central
Published in
Respiratory Research / Issue 1/2013
Electronic ISSN: 1465-993X
DOI
https://doi.org/10.1186/1465-9921-14-19

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