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Functional and pathological effects of prolonged hyperoxia in neonatal mice
B B Warner1, L A Stuart, R A Papes
1Division of Neonatology and Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA.
The American Journal of Physiology
|August 5, 1998
Summary
Neonatal hyperoxia in mice caused lung damage similar to bronchopulmonary dysplasia (BPD), characterized by fibrosis and inflammation. Reduced lung cell proliferation appears to be a key factor in this chronic lung disease.
Area of Science:
- Pulmonary Medicine
- Neonatal Research
- Developmental Biology
Background:
- Bronchopulmonary dysplasia (BPD) is a common complication in premature infants.
- Understanding BPD pathophysiology requires robust animal models.
- Neonatal lung development is sensitive to environmental factors like oxygen exposure.
Purpose of the Study:
- To establish and characterize a neonatal mouse model of hyperoxia-induced lung injury.
- To investigate the cellular and molecular mechanisms underlying hyperoxia-induced lung changes.
- To assess the functional consequences of neonatal hyperoxia on lung mechanics.
Main Methods:
- Neonatal FVB/N mice were exposed to 85% oxygen for 28 days.
- Lung structure, cell proliferation, inflammatory cell infiltration, gene expression, and lung function were assessed.
- Histological analysis, RT-PCR, and lung function tests were performed.
Main Results:
- Hyperoxia led to decreased alveolar septation, enlarged air spaces, and lung fibrosis.
- Reduced lung cell proliferation was observed early and persisted for weeks.
- Increased inflammatory cells and elevated pro-inflammatory cytokine expression (IL-1α, MIP-1α) were noted.
- Functional changes included decreased lung volume and pulmonary compliance.
Conclusions:
- Prolonged neonatal hyperoxia in mice induces lung pathology closely resembling human BPD.
- Altered lung cell proliferation is a significant factor in the pathogenesis of neonatal chronic lung disease.
- This model is valuable for studying BPD and potential therapeutic interventions.