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Inhaled nitric oxide decreases hyperoxia-induced surfactant abnormality in preterm rabbits
A Issa1, U Lappalainen, M Kleinman
1Department of Pediatrics, University of California, Irvine, USA.
Pediatric Research
|February 18, 1999
Summary
Inhaled nitric oxide (iNO) protected preterm rabbits from hyperoxia-induced lung injury. iNO reduced oxidant stress and improved alveolar surfactant function following premature birth.
Area of Science:
- Neonatal Physiology
- Pulmonary Medicine
- Oxidative Stress Research
Background:
- Inhaled nitric oxide (iNO) is a selective pulmonary vasodilator with potential antioxidant/pro-oxidant properties.
- Premature birth can lead to lung injury, and the effects of iNO on the developing alveolar lining are not fully understood.
Purpose of the Study:
- To investigate the impact of inhaled nitric oxide (iNO) on the alveolar lining of premature rabbits exposed to hyperoxia.
- To determine if iNO mitigates hyperoxia-induced damage to surfactant components and function.
Main Methods:
- Preterm rabbits were exposed to 14 ppm NO and 98% O2, 98% O2 alone, or air.
- Bronchoalveolar lavage (BAL) was performed to isolate surfactant aggregates for analysis of components and surface activity.
- Epithelial lining fluid was analyzed for markers of oxidative stress, including malondialdehyde and glutathione.
Main Results:
- Hyperoxia (98% O2) decreased large surfactant aggregates, surface activity, and surfactant protein B content.
- Inhaled nitric oxide (iNO) partially or completely prevented these hyperoxic effects on surfactant.
- Hyperoxia increased oxidative stress markers (malondialdehyde) and decreased antioxidants (glutathione), effects attenuated by iNO.
Conclusions:
- Acute hyperoxia induces oxidant stress and impairs alveolar surfactant function in premature rabbits.
- Low-dose inhaled nitric oxide (iNO) effectively mitigates hyperoxia-induced lung injury by reducing oxidative stress and preserving surfactant function.