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Related Experiment Videos

Surfactant subtypes in mice: characterization and quantitation.

N J Gross1, K R Narine

  • 1Department of Medicine, Stritch-Loyola School of Medicine, Hines, Illinois.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1989
PubMed
Summary

Mouse lung surfactant separates into three subtypes: light, heavy, and ultraheavy. The ultraheavy form, containing tubular myelin, is secreted first and evolves into other forms, impacting lung surface tension.

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Area of Science:

  • Pulmonary Medicine
  • Cell Biology
  • Biochemistry

Background:

  • Pulmonary surfactant is crucial for reducing surface tension in the alveoli.
  • Understanding surfactant structure and dynamics is key to respiratory health.

Purpose of the Study:

  • To characterize the subtypes of mouse pulmonary surfactant.
  • To investigate the origin and transformation of surfactant components in the alveoli.

Main Methods:

  • Bronchoalveolar lavage was performed on adult mice.
  • Surfactant was separated using continuous sucrose gradient ultracentrifugation.
  • Phospholipid composition and buoyant density of subtypes were analyzed.

Main Results:

  • Three surfactant subtypes (light, heavy, ultraheavy) were identified with distinct densities and structures.

Related Experiment Videos

  • The ultraheavy subtype, rich in tubular myelin and similar to lamellar bodies, was labeled first.
  • The heavy and light subtypes, composed mainly of vesicles, showed decreasing surface activity.

    • Conclusions:

    • Mouse surfactant is secreted as an ultraheavy form containing lamellar body-like structures.
    • This ultraheavy form transforms into heavy and light subtypes within the alveoli.
    • This dynamic process influences surfactant's surface activity and lung function.