title: Association between oxidative DNA damage and the expression of 8-oxoguanine DNA glycosylase 1 in lung epithelial cells of neonatal rats exposed to hyperoxia.
abstract: Previous studies have demonstrated that oxidative stress‑induced lung injury is involved in the occurrence and developmental process of bronchopulmonary dysplasia (BPD). The present study assessed whether oxidative DNA damage occurs in the early stages of hyperoxia‑induced BPD in neonatal rats and evaluated the expression and localization of the DNA repair gene, 8‑oxoguanine DNA glycosylase 1 (OGG1), upon exposure to hyperoxia. Neonatal rats and primary cultured neonatal rat alveolar epithelial type II (AECII) cells were exposed to hyperoxia (90% O2) or normoxia (21% O2) and the expression levels of 8‑hydroxy‑2'‑deoxyguanosine (8‑OHdG) in the lung tissues and AECII cells were determined using a competitive enzyme‑linked immunosorbent assay. DNA strand breaks in the AECII cells were detected using a comet assay. The expression and localization of the OGG1 protein in the lung tissues and AECII cells were determined by immunofluorescence confocal microscopy and western blotting. The mRNA expression levels of OGG1 in the lung tissues and AECII cells were determined by reverse transcription polymerase chain reaction. The expression of 8‑OHdG was elevated in the hyperoxia‑exposed neonatal rat lung tissue and the AECII cells compared with the normoxic controls. The occurrence of DNA strand breaks in the AECII cells increased with increasing duration of hyperoxia exposure. The protein expression of OGG1 was significantly increased in the hyperoxia‑exposed lung tissues and AECII cells, with OGG1 preferentially localized to the cytoplasm. No concomitant increase in the mRNA expression of OGG1 was detected. These results revealed that oxidative DNA damage occurred in lung epithelial cells during early‑stage BPD, as confirmed by in vitro and in vivo hyperoxia exposure experiments, and the increased expression of OGG1 was associated with this process.
authors: Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China.
authors: Linlin
authors: L
authors: Jin
authors: Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China.
authors: Haiping
authors: H
authors: Yang
authors: Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China.
authors: Jianhua
authors: J
authors: Fu
authors: Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China.
authors: Xindong
authors: X
authors: Xue
authors: Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China.
authors: Li
authors: L
authors: Yao
authors: Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China.
authors: Lin
authors: L
authors: Qiao
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001997:Bronchopulmonary Dysplasia / Q000150:complications / Q000235:genetics* / Q000473:pathology; D002478:Cells, Cultured; D004249:DNA Damage; D045647:DNA Glycosylases / Q000235:genetics*; D004847:Epithelial Cells / Q000378:metabolism / Q000473:pathology*; D005260:Female; D005786:Gene Expression Regulation; D018496:Hyperoxia / Q000150:complications / Q000235:genetics* / Q000473:pathology; D008168:Lung / Q000378:metabolism / Q000473:pathology*; D018384:Oxidative Stress; D011247:Pregnancy; D051381:Rats; D017208:Rats, Wistar
chemical_list: D045647:DNA Glycosylases; C483741:OGG1 protein, rat