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Temporal Patterns of Gene Expression Profiles in the Neonatal Mouse Lung after Hypoxia-Reoxygenation
Anne Gro W Rognlien1, Embjørg J Wollen, Monica Atneosen-Åsegg
1Division of Paediatric and Adolescent Medicine, Department of Pediatric Research, University of Oslo, Oslo University Hospital HF, Oslo, Norway.
Insights
Neonatal asphyxia can cause lung injury. This study reveals gene expression changes in newborn mouse lungs after hypoxia-reoxygenation, identifying key inflammatory and apoptotic patterns.
Area of Science:
- Neonatal physiology
- Molecular biology
- Pulmonary medicine
Background:
- Neonatal asphyxia affects 25% of infants, often involving lung complications.
- Limited research exists on the mechanisms of lung injury from hypoxia-reoxygenation in newborns.
Purpose of the Study:
- To profile gene expression changes in newborn mouse lungs following hypoxia-reoxygenation.
- To compare gene expression changes after hyperoxic versus normoxic reoxygenation.
Main Methods:
- Postnatal day 7 mice underwent 2-hour hypoxia (8% O2) followed by 30-minute reoxygenation (60% O2 or air).
- Gene expression and protein concentrations in lung homogenates were analyzed over 72 hours.
Main Results:
- Immediately post-reoxygenation, inflammatory mediators were downregulated, and an antiapoptotic gene pattern emerged.
- Three DNA glycosylases were downregulated; cell cycle regulators showed mixed effects.
- Sod1 and Il1b gene expression differed significantly between hyperoxic and normoxic reoxygenation groups.
Conclusions:
- Hypoxia-reoxygenation in newborn mouse lungs leads to downregulated inflammatory genes and an antiapoptotic profile.
- Differential expression of Sod1 and Il1b was observed when comparing 60% O2 reoxygenation with air reoxygenation.
Background:
One out of four children with neonatal asphyxia has lung involvement. Still, there has been little research on injury mechanisms of hypoxia-reoxygenation in the neonatal lung.
Objectives:
To make a temporal profile of the gene expression changes of 44 a priori selected genes after hypoxia-reoxygenation in the newborn mouse lung, and to compare the changes after hyperoxic and normoxic reoxygenation.
Methods:
Postnatal day 7 mice were randomized to 2-hour hypoxia (8% O2) and 30-min reoxygenation in either 60% O2 or air. After 0-72 h of observation, gene expression changes and protein concentrations in whole lung homogenates were examined.
Results:
Immediately after completed reoxygenation, 7 genes of mediators of inflammation were downregulated, and there was an antiapoptotic gene expression pattern. Three DNA glycosylases were downregulated, while genes involved in cell cycle renewal indicated both increased and decreased cell cycle arrest. Sod1 (T2.5h median H60: 1.01, H21: 0.88, p = 0.005; T5h median H60: 1.04, H21: 0.85, p = 0.038) and Il1b (T0h median H60: 0.86, H21: 1.08, p = 0.021) were significantly differentially expressed when comparing hyperoxic and normoxic reoxygenation.
Conclusion:
In this newborn mouse lung hypoxia-reoxygenation model, we found downregulation of genes of mediators of inflammation, an antiapoptotic gene expression pattern, and downregulation of DNA glycosylases. Sod1 and Il1b were significantly differentially expressed when comparing reoxygenation using 60% O2 with air.
