Neonatal hyperoxia contributes additively to cigarette smoke-induced chronic obstructive pulmonary disease changes in adult mice

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Abstract

The extent by which early postnatal lung injury contributes to the development of chronic obstructive pulmonary disease (COPD) in the adult is unclear. We hypothesized that exposure to hyperoxia during early postnatal life can augment lung changes caused by adult chronic cigarette smoke(CS) exposure. C57BL/6J mice (1dold) were exposed to hyperoxia (O 2) for 5 days. At 1 month of age, half of the O 2 - exposed mice and half of the control mice were placed in aCS chamber for 6 months. After exposure to CS, mice underwent quasistatic pressure - volume curve and mean chord length measurements; quantification of pro - Sp-c expression; and measurement of lung IL-8/ KC,CXCR2/IL8Ra, TNF-a, and IL-6 mRNA by real-time PCR. Adult mice exposed to O 2+CS had significantly larger chord length measurements (P < 0.02) and lung volumes at 35 cm H 2O (P < 0.05) compared with all other groups. They also had significantly less pro - Sp-c protein and surfactant protein C mRNA expression (P < 0.003). Mice exposed to O 2+CS and CS-only mice had significantly higher lung resistance and longer mean time constants (P < 0.01), significantly more inflammatory cells in the bronchoalveolar lavage fluid (P < 0.03), and significantly higher levels of lung CXCR2/IL8Rα mRNA compared with mice not exposed to smoke (P < 0.02). We conclude that exposure to early postnatal hyperoxia contributed additively to CS-induced COPD changes in adult mice. These results may be relevant to a growing population of preterm children who sustained lung injury in the newborn period and may be exposed to CS in later life.

Original languageEnglish (US)
Pages (from-to)610-616
Number of pages7
JournalAmerican journal of respiratory cell and molecular biology
Volume45
Issue number3
DOIs
StatePublished - Sep 1 2011

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Keywords

  • Airspace abnormalities
  • Chronic cigarette smoke exposure
  • Chronic obstructive pulmonary disease
  • Early postnatal hyperoxia

ASJC Scopus subject areas

  • Molecular Biology
  • Pulmonary and Respiratory Medicine
  • Clinical Biochemistry
  • Cell Biology

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