title: Chronic hypoxia and rat lung development: analysis by morphometry and directed microarray.
abstract: It is unclear how sublethal hypoxia affects lung development. To investigate the effects of chronic hypoxia on postnatal lung remodeling, we treated neonatal rats with FIO2 of 0.12 for 10 d and analyzed lung development by morphometry and gene expression by DNA microarray. Our results showed the neonatal rats exposed to hypoxia reduced body weight by 42% and wet lung weight by 32% compared with the neonatal rats exposed to normoxia. In the neonatal rats exposed to hypoxia, the radial alveolar counts were decreased to 5.6 from 7.9 and the mean linear intercepts were increased to 56.5 mum from 38.2 mum. In DNA microarray analysis, approximately half of probed genes were unknown. Chronic hypoxia significantly regulated expression of genes that are involved in pathogenesis of pulmonary hypertension and postnatal lung remodeling. Chemokine ligand 12, jagged 2 were among those upregulated; c-kit, ephrin A1, and Hif-2alpha were among those downregulated. The altered expression of those genes was correlated with the lung development and remodeling.
authors.affiliation: Department of Pediatrics, Section of Neonatology, University of Missouri-Kansas City School of Medicine, Children's Mercy Hospitals and Clinics, Kansas City, Missouri 64108, USA. wtruog@cmh.edu
authors.forename: William E
authors.initials: WE
authors.lastname: Truog
authors.forename: Dong
authors.initials: D
authors.lastname: Xu
authors.forename: Ikechukwu I
authors.initials: II
authors.lastname: Ekekezie
authors.forename: Sherry
authors.initials: S
authors.lastname: Mabry
authors.forename: Mo
authors.initials: M
authors.lastname: Rezaiekhaligh
authors.forename: Stan
authors.initials: S
authors.lastname: Svojanovsky
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Soares
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001835:Body Weight; D002908:Chronic Disease; D004195:Disease Models, Animal; D020869:Gene Expression Profiling / Q000379:methods*; D018507:Gene Expression Regulation, Developmental; D000860:Hypoxia / Q000235:genetics* / Q000473:pathology* / Q000503:physiopathology; D018919:Neovascularization, Physiologic; D020411:Oligonucleotide Array Sequence Analysis; D009929:Organ Size; D011650:Pulmonary Alveoli / Q000098:blood supply / Q000254:growth & development / Q000473:pathology*; D051381:Rats; D015203:Reproducibility of Results