Genetic Ablation of Bach1 Gene Enhances Recovery from Hyperoxic Lung Injury in Newborn Mice Via Transient Upregulation of Inflammatory Genes

Overview

Journal Pediatr Res

Specialties Biology
Pediatrics

Date 2017 Jan 19

PMID 28099425

Citations 9

Authors

Masato Ito

Nobuhiko Nagano

Yukio Arai

Ryo Ogawa

Shingo Kobayashi

Yukiko Motojima

Hayato Go

Masanori Tamura

Kazuhiko Igarashi

Phyllis A Dennery

Fumihiko Namba

Affiliations

Soon will be listed here.

Abstract

Background: BTB and CNC homology 1 (Bach1) is a transcriptional repressor of heme oxygenase (HO)-1. The effects of Bach1 disruption on hyperoxic lung injury in newborn mice have not been determined. We aimed to investigate the role of Bach1 in the newborns exposed to hyperoxia.

Methods: Bach1 and WT newborn mice were exposed to 21% or 95% oxygen for 4 d and were then allowed to recover in room air. Lung histology was assessed and lung Bach1, HO-1, interleukin (IL)-6, and monocyte chemoattractant protein (MCP)-1 mRNA levels were evaluated using RT-PCR. Lung inflammatory cytokine levels were determined using cytometric bead arrays.

Results: After 10 d recovery from neonatal hyperoxia, Bach1 mice showed improved lung alveolarization compared with WT. HO-1, IL-6, and MCP-1 mRNA levels and IL-6 and MCP-1 protein levels were significantly increased in the Bach1 lungs exposed to neonatal hyperoxia. Although an increase in apoptosis was observed in the Bach1 and WT lungs after neonatal hyperoxia, there were no differences in apoptosis between these groups.

Conclusion: Bach1 newborn mice were well-recovered from hyperoxia-induced lung injury. This effect is likely achieved by the antioxidant/anti-inflammatory activity of HO-1 or by the transient overexpression of proinflammatory cytokines.

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