Mitochondrial dysfunction contributes to alveolar developmental arrest in hyperoxia-exposed mice. Academic Article uri icon

Overview

MeSH

  • Animals
  • Cell Respiration
  • Electron Transport Complex I
  • Mice
  • Mice, Inbred C57BL

MeSH Major

  • Hyperoxia
  • Mitochondria
  • Pulmonary Alveoli

abstract

  • This study investigated whether mitochondrial dysfunction contributes to alveolar developmental arrest in a mouse model of bronchopulmonary dysplasia (BPD). To induce BPD, 3-day-old mice were exposed to 75% O2. Mice were studied at two time points of hyperoxia (72 h or 2 wk) and after 3 weeks of recovery in room air (RA). A separate cohort of mice was exposed to pyridaben, a complex-I (C-I) inhibitor, for 72 hours or 2 weeks. Alveolarization was quantified by radial alveolar count and mean linear intercept methods. Pulmonary mitochondrial function was defined by respiration rates, ATP-production rate, and C-I activity. At 72 hours, hyperoxic mice demonstrated significant inhibition of C-I activity, reduced respiration and ATP production rates, and significantly decreased radial alveolar count compared with controls. Exposure to pyridaben for 72 hours, as expected, caused significant inhibition of C-I and ADP-phosphorylating respiration. Similar to hyperoxic littermates, these pyridaben-exposed mice exhibited significantly delayed alveolarization compared with controls. At 2 weeks of exposure to hyperoxia or pyridaben, mitochondrial respiration was inhibited and associated with alveolar developmental arrest. However, after 3 weeks of recovery from hyperoxia or 2 weeks after 72 hours of exposure to pyridaben alveolarization significantly improved. In addition, there was marked normalization of C-I and mitochondrial respiration. The degree of hyperoxia-induced pulmonary simplification and recovery strongly (r(2) = 0.76) correlated with C-I activity in lung mitochondria. Thus, the arrest of alveolar development induced by either hyperoxia or direct inhibition of mitochondrial oxidative phosphorylation indicates that bioenergetic failure to maintain normal alveolar development is one of the fundamental mechanisms responsible for BPD.

publication date

  • May 2009

has subject area

  • Animals
  • Cell Respiration
  • Electron Transport Complex I
  • Hyperoxia
  • Mice
  • Mice, Inbred C57BL
  • Mitochondria
  • Pulmonary Alveoli

Research

keywords

  • Journal Article

Identity

Language

  • eng

PubMed Central ID

  • PMC3269235

Digital Object Identifier (DOI)

  • 10.1165/rcmb.2008-0341RC

PubMed ID

  • 19168698

Additional Document Info

start page

  • 511

end page

  • 518

volume

  • 40

number

  • 5