Effect of retinoic acid on oxygen-induced lung injury in the newborn rat.

Ozer E., Kumral A., Ozer E., Duman N., Yilmaz O., Ozkal S., ...More

Pediatric pulmonology, vol.39, no.1, pp.35-40, 2005 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 1
  • Publication Date: 2005
  • Doi Number: 10.1002/ppul.20131
  • Journal Name: Pediatric pulmonology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.35-40
  • Keywords: bronchopulmonary dysplasia, oxygen-induced lung injury, preterm infants, retinoic acid, vitamin A, BRONCHOPULMONARY DYSPLASIA, EXPRESSION, PATTERN, COLLAGEN, ALTERS, BETA
  • Dokuz Eylül University Affiliated: Yes


Oxygen-induced lung injury is believed to lead to the development of bronchopulmonary dysplasia (BPD). To determine whether retinoic acid (RA) treatment prevents the development of BPD by minimizing lung injury, we investigated the effect of RA on the histopathologic characteristics of oxygen-induced lung injury in a newborn rat model. Eighteen rat pups were divided into three groups: room air-exposed control group (n = 5), oxygen-exposed placebo group (n 7), and RA-treated oxygen-exposed group (n = 6). Measurement of alveolar area, quantitation of secondary crest formation, microvessel count, evaluation of alveolar septal fibrosis, and smooth muscle actin (SMA) immunostaining were performed to assess oxygen-induced changes in lung morphology. Treatment of oxygen-exposed animals with RA resulted in a significant increase in mean alveolar area; however, it had no effect on the number of secondary crests and microvessel count. The degree of fibrosis and SMA expression showed a significant decrease in RA-treated animals. We conclude that RA treatment improves alveolar structure and decreases fibrosis in the newborn rat with oxygen-induced lung injury. Extrapolating these findings to humans, we speculate that similar treatment with RA may reduce lung injury in preterm infants at risk for BPD. (C) 2004 Wiley-Liss,inc.