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Related Experiment Videos

Hyperoxia and apoptosis in developing mouse lung mesenchyme.

Heather I Dieperink1, Timothy S Blackwell, Lawrence S Prince

  • 1Department of Pediatrics, University of Alabama at Birmingham, 35294, USA.

Pediatric Research
|January 28, 2006
PubMed
Summary

High oxygen exposure (hyperoxia) harms premature infant lung development by inhibiting airway branching and causing cell death in lung tissue. This study shows hyperoxia directly induces apoptosis in fetal mouse lung mesenchyme, impacting airway formation.

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Area of Science:

  • Developmental Biology
  • Neonatal Physiology
  • Pulmonary Medicine

Background:

  • Bronchopulmonary dysplasia (BPD) is a significant complication in premature infants, often linked to hyperoxia exposure.
  • Lung development, including distal airway branching and alveolar septation, continues postnatally in premature infants, making them vulnerable to environmental insults.
  • Hyperoxia, or excessive oxygen, is a known risk factor for BPD, but its direct impact on fetal lung development mechanisms is not fully understood.

Purpose of the Study:

  • To investigate the direct effects of hyperoxia on distal airway branching in developing fetal mouse lungs.
  • To determine if hyperoxia induces apoptosis in the fetal lung mesenchyme.
  • To explore the role of NF-kappaB signaling in hyperoxia-induced lung injury.

Main Methods:

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  • Culturing E16 fetal mouse lung explants in normoxia (20% O2) and hyperoxia (95% O2).
  • Assessing distal airway branching using microscopy.
  • Quantifying apoptosis via caspase 3/7 activity assays, caspase 3 expression, and annexin V binding.
  • Analyzing NF-kappaB activation (p65 localization) and its role in caspase 3 activation.

Main Results:

  • Hyperoxia significantly reduced the number and complexity of distal airways in cultured lung explants.
  • Increased apoptosis was observed in mesenchymal cells of hyperoxic explants, confirmed by elevated caspase 3/7 activity and annexin V binding.
  • NF-kappaB activation was detected in hyperoxic explants, and its inhibition protected against hyperoxia-induced caspase 3 activation.

Conclusions:

  • Hyperoxia directly inhibits distal airway branching in the developing fetal mouse lung.
  • Hyperoxia induces apoptosis in fetal lung mesenchymal cells, contributing to impaired lung development.
  • NF-kappaB activation plays a role in mediating hyperoxia-induced apoptosis in the fetal lung mesenchyme.