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Respiratory Research
Published in: Respiratory Research 1/2010

Open Access 01-12-2010 | Research

Disrupted postnatal lung development in heme oxygenase-1 deficient mice

Authors: Tiangang Zhuang, Monica Zhang, Huayan Zhang, Phyllis A Dennery, Qing S Lin

Published in: Respiratory Research | Issue 1/2010

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Abstract

Background

Heme oxygenase (HO) degrades cellular heme to carbon monoxide, iron and biliverdin. The HO-1 isoform is both inducible and cyto-protective during oxidative stress, inflammation and lung injury. However, little is known about its precise role and function in lung development. We hypothesized that HO-1 is required for mouse postnatal lung alveolar development and that vascular expression of HO-1 is essential and protective during postnatal alveolar development.

Methods

Neonatal lung development in wildtype and HO-1 mutant mice was evaluated by histological and molecular methods. Furthermore, these newborn mice were treated with postnatal dexamethasone (Dex) till postnatal 14 days, and evaluated for lung development.

Results

Compared to wildtype littermates, HO-1 mutant mice exhibited disrupted lung alveolar structure including simplification, disorganization and reduced secondary crest formation. These defects in alveolar development were more pronounced when these mice were challenged with Dex treatment. Expression levels of both vascular endothelial and alveolar epithelial markers were also further decreased in HO-1 mutants after Dex treatment.

Conclusions

These experiments demonstrate that HO-1 is required in normal lung development and that HO-1 disruption and dexamethasone exposure are additive in the disruption of postnatal lung growth. We speculate that HO-1 is involved in postnatal lung development through modulation of pulmonary vascular development.
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Metadata
Title
Disrupted postnatal lung development in heme oxygenase-1 deficient mice
Authors
Tiangang Zhuang
Monica Zhang
Huayan Zhang
Phyllis A Dennery
Qing S Lin
Publication date
01-12-2010
Publisher
BioMed Central
Published in
Respiratory Research / Issue 1/2010
Electronic ISSN: 1465-993X
DOI
https://doi.org/10.1186/1465-9921-11-142

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