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Increased expression of heme oxygenase-1 suppresses airway branching morphogenesis in fetal mouse lungs exposed to inflammation. | LitMetric
Background : Intrauterine inflammation affects fetal lung development. BTB and CNC homology 1 (Bach1) is a transcriptional repressor of heme oxygenase-1 (HO-1) and interleukin-6 (IL-6) genes. We investigated the role of Bach1 in the development of fetal mouse lungs exposed to lipopolysaccharide (LPS) using a whole fetal lung tissue culture system.Methods : We isolated and cultured embryonic day 12.5 fetal mouse lungs from pregnant Bach1 knockout () and wild-type (WT) mice. Airway branching morphogenesis was assessed by microscopically counting peripheral lung buds after incubation with/without LPS. Expression levels of genes related to inflammation and oxidative stress were evaluated using quantitative PCR. Zinc protoporphyrin, HO-1-specific inhibitor, was used.Results : Branching morphogenesis was observed in Bach1 and WT fetal mice lungs without LPS exposure; after exposure to LPS, the number of peripheral lung buds was suppressed in Bach1 group only. Basal messenger RNA (mRNA) and protein expression of HO-1 was significantly higher in Bach1 group than in WT group; IL-6 and monocyte chemoattractant protein-1 mRNA expression was significantly increased after LPS exposure in both groups. Zinc protoporphyrin mitigated the LPS-induced suppression of branching morphogenesis in Bach1 mice.Conclusion : The ablation of Bach1 suppresses airway branching morphogenesis after LPS exposure by increased basal expression levels of HO-1.
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