Neonatal oxygen exposure alters airway hyper-responsiveness but not the response to allergen challenge in adult mice
Article first published online: 13 FEB 2014
© 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd
Pediatric Allergy and Immunology
Special Issue: Asthma in childhood GUEST EDITOR Gunilla Hedlin • Stockholm, Sweden
Volume 25, Issue 2, pages 180–186, March 2014
How to Cite
Neonatal oxygen exposure alters airway hyper-responsiveness but not the response to allergen challenge in adult mice. Pediatr Allergy Immunol 2014: 25: 180–186., , , , .
- Issue published online: 16 MAR 2014
- Article first published online: 13 FEB 2014
- Manuscript Accepted: 18 JAN 2014
- National Institutes of Health (NIH). Grant Numbers: HL-091968, HL-097141, ES-018750
- University of Minnesota Grant-in-Aid. Grant Numbers: ES-07026, HL-66988
- NIH. Grant Numbers: R25 GM086669, ES-01247
- The animal inhalation facility at the University of Rochester
- airway hyper-responsiveness;
- lung inflammation;
- neonatal hyperoxia
Infants born prematurely are often treated with supplemental oxygen, which can increase their risk for airway hyper-responsiveness (AHR), asthma, reduced lung function, and altered responses to respiratory viral infections later in childhood. Likewise, exposure of newborn mice to hyperoxia alters baseline pulmonary mechanics and the host response to influenza A virus infection in adult mice. Here, we use this mouse model to test the hypothesis that neonatal hyperoxia also promotes AHR and exacerbated allergen-induced symptoms in adult mice.
Baseline lung mechanics and AHR measured by methacholine provocation were assessed in adult male and female mice exposed to room air or 100% oxygen (hyperoxia) between post-natal days 0–4. AHR and lung inflammation were evaluated after adult female mice were sensitized with ovalbumin (OVA) plus alum and challenged with aerosolized OVA.
Baseline lung compliance increased and resistance decreased in adult female, but not male, mice exposed to neonatal hyperoxia compared with siblings exposed to room air. Neonatal hyperoxia significantly enhanced methacholine-induced AHR in female mice, but did not affect allergen-induced AHR to methacholine or lung inflammation.
Increased incidence of AHR and asthma is reported in children born prematurely and exposed to supplemental oxygen. Our findings in adult female mice exposed to hyperoxia as neonates suggest that this AHR reported in children born prematurely may reflect non-atopic wheezing due to intrinsic structural changes in airway development.