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Related Experiment Videos

Oxygen toxicity in mouse lung: pathways to cell death

C Barazzone1, S Horowitz, Y R Donati

  • 1Departments of Pediatrics and Pathology, University of Geneva, Switzerland. Constance.Barazzone@medecine.unige.ch

American Journal of Respiratory Cell and Molecular Biology
|October 8, 1998
PubMed
Summary

High oxygen exposure causes lung damage through both apoptosis and necrosis. Blocking specific cell death pathways did not protect mice, indicating complex mechanisms in hyperoxia-induced lung injury.

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Area of Science:

  • Pulmonary Medicine
  • Cell Biology
  • Toxicology

Background:

  • High oxygen (hyperoxia) exposure causes significant lung injury.
  • Cell death, including apoptosis and necrosis, is a key feature of this damage.

Purpose of the Study:

  • To investigate the mechanisms of cell death in hyperoxia-induced lung injury in mice.
  • To determine the roles of specific apoptotic pathways and proteases in this process.

Main Methods:

  • Mice were exposed to 100% oxygen.
  • Lung tissue was analyzed using electron microscopy and DNA electrophoresis.
  • Levels of apoptosis-related proteins (p53, bax, bcl-x, Fas) were measured.
  • Inhibitors of apoptosis-related proteases and genetically modified mice (p53-deficient, Fas null) were used.

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Main Results:

  • Hyperoxia induced diffuse alveolar damage and edema, with cell death showing features of both apoptosis and necrosis.
  • Increased expression of p53, bax, bcl-x, and Fas was observed, but key apoptotic executioner proteases (caspase 3, caspase 1) showed no increased activity.
  • Inhibition of ICE-like proteases or the absence of p53 or Fas did not confer resistance to hyperoxia.
  • Both apoptosis and necrosis were confirmed to contribute to cell death.

Conclusions:

  • Cell death during hyperoxia involves both necrosis and apoptosis.
  • Multiple apoptotic pathways appear to be activated.
  • Targeting specific apoptotic pathways or proteases is insufficient to prevent hyperoxia-induced lung damage.