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Related Experiment Videos

Early gestational intra-amniotic endotoxin: lung function, surfactant, and morphometry.

Timothy J M Moss1, John P Newnham, Karen E Willett

  • 1School of Women's and Infants' Health and Centre for Child Health Research, University of Western Australia, Perth, Australia. tmoss@cyllene.uwa.edu.au

American Journal of Respiratory and Critical Care Medicine
|March 19, 2002
PubMed
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Early intra-amniotic inflammation in preterm lambs improved lung function. Despite altered surfactant and lung growth, this inflammation enhanced preterm lung function, mimicking some aspects of bronchopulmonary dysplasia.

Area of Science:

  • Neonatal Physiology
  • Pulmonary Development
  • Inflammatory Response

Background:

  • Preterm birth complications often involve lung injury.
  • Understanding fetal inflammatory responses is crucial for lung development.
  • Endotoxin exposure models intra-amniotic inflammation.

Purpose of the Study:

  • To investigate the effects of intra-amniotic endotoxin exposure at different gestational ages on preterm lamb lung function, structure, and surfactant system.
  • To determine if early gestational inflammation impacts lung development and surfactant composition.

Main Methods:

  • Pregnant ewes received intra-amniotic endotoxin (Escherichia coli 055:B5) or saline at various gestational ages (60, 80, 100 days, or combined, or continuous infusion).
  • Lung function, lung structure (lung-to-body weight ratio, alveolarization, surface area, wall thickness), and surfactant system (saturated phosphatidylcholine, surfactant protein mRNA and protein B) were assessed at 125 days gestation.

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  • Control lambs received saline treatments.

    • Main Results:

    • All endotoxin groups showed improved lung function at 125 days.
    • Saturated phosphatidylcholine increased in lung tissue (except 60+100 day group), but not lavage.
    • Surfactant protein mRNA and pool sizes varied with treatment timing.
    • All endotoxin groups exhibited increased mature surfactant protein B in alveolar lavage.
    • Endotoxin exposure from 80-108 days reduced lung-to-body weight ratio, alveolar number, total surface area, and increased alveolar wall thickness.

    Conclusions:

    • Intra-amniotic inflammatory stimuli in early gestation can alter pulmonary development.
    • The net effect of this inflammation is improved preterm lung function.
    • These changes, despite affecting surfactant and lung growth, result in improved lung function, contrasting with typical bronchopulmonary dysplasia outcomes in ventilated neonates.