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Related Experiment Videos

Rat lung surfactant kinetics biochemical and morphometric correlation.

S L Young, S A Kremers, J S Apple

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |August 1, 1981
    PubMed
    Summary

    Researchers studied rat lung surfactant, disaturated phosphatidylcholine (DSPC). They found that while a small amount of DSPC is intracellular, it is all secreted onto the alveolar surface for lung function.

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    Area of Science:

    • Pulmonary Physiology
    • Biochemistry
    • Cell Biology

    Background:

    • Surfactant is crucial for lung function, maintaining alveolar stability.
    • Disaturated phosphatidylcholine (DSPC) is a major component of pulmonary surfactant.
    • Understanding DSPC distribution and flux is key to respiratory health research.

    Purpose of the Study:

    • To estimate the distribution and flux of disaturated phosphatidylcholine (DSPC) within rat lung surfactant pathways.
    • To quantify DSPC within alveolar epithelial type II cells and lamellar bodies.
    • To determine the rate of DSPC secretion onto the alveolar surface.

    Main Methods:

    • Combined biochemical and morphometric techniques.
    • Isolated lamellar bodies (LB) from rat lung homogenates using discontinuous sucrose density gradients.

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  • Measured DSPC in LB and alveolar lavage (LV) material.
  • Utilized [14C]palmitate radiolabeling to track DSPC flux.

    • Main Results:

    • Identified approximately 126 million alveolar epithelial type II cells per rat lung, each with about 150 lamellar bodies.
    • Found that only 30% of total lung DSPC resides within intracellular compartments (14% in LB, 16% in LV).
    • Demonstrated a product-precursor relationship between LB and LV, with a surfactant-associated DSPC flux of 90 µg/lung/hour.

    Conclusions:

    • Despite a small intracellular pool, all DSPC within the surfactant pathway is ultimately secreted to the alveolar surface.
    • This study elucidates the dynamic flux and distribution of DSPC in the lung's surfactant system.
    • Findings contribute to understanding the cellular mechanisms of pulmonary surfactant homeostasis.