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Related Experiment Videos

Pulmonary dysfunction in neonatal SP-B-deficient mice

K Tokieda1, J A Whitsett, J C Clark

  • 1Division of Neonatology, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA.

The American Journal of Physiology
|November 14, 1997
PubMed
Summary

Surfactant protein B (SP-B) is critical for newborn mammals to breathe air. Lack of SP-B causes respiratory failure, while reduced levels impair lung function, highlighting its vital role in perinatal adaptation.

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Area of Science:

  • Pulmonary physiology
  • Respiratory system development
  • Biochemistry

Background:

  • Surfactant protein B (SP-B) is essential for lung function after birth.
  • SP-B plays a role in surfactant assembly and function.
  • Understanding SP-B's role is crucial for neonatal respiratory health.

Purpose of the Study:

  • To investigate the role of surfactant protein B (SP-B) in pulmonary adaptation to air breathing in newborn mice.
  • To determine the effects of SP-B deficiency on lung function, oxygenation, and survival.
  • To assess the impact of varying SP-B levels on lung mechanics and surfactant composition.

Main Methods:

  • Pulmonary function tests were performed on newborn wild-type, heterozygous (SP-B+/-), and homozygous (SP-B-/-) mice.

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  • Western analysis was used to assess SP-B proprotein levels.
  • Lung volumes, compliance, and oxygenation were measured.
  • Intratracheal administration of perfluorocarbon was used to assess its therapeutic potential.

    • Main Results:

    • SP-B-/- mice exhibited respiratory failure, failed lung inflation, and died rapidly after birth.
    • SP-B+/- mice showed slightly decreased lung compliance but survived postnatally.
    • SP-B proprotein was absent in SP-B-/- mice and reduced in SP-B+/- mice.
    • Intratracheal perfluorocarbon improved lung expansion, oxygenation, and survival in SP-B-/- mice.

    Conclusions:

    • Surfactant protein B (SP-B) is indispensable for perinatal adaptation to air breathing.
    • Complete lack of SP-B leads to fatal respiratory failure at birth.
    • Reduced SP-B levels are associated with decreased lung compliance, underscoring its critical role in neonatal respiratory function.