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Related Experiment Videos

Clara cells in the llama.

D Heath, P Smith, P Harris

    Experimental Cell Biology
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    High-altitude llamas exhibit prominent Clara cells with apical caps containing pulmonary surfactant. This suggests a continuous need for surfactant in animals chronically exposed to high altitudes.

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    Area of Science:

    • Pulmonary physiology
    • High-altitude adaptation
    • Cell biology

    Background:

    • Clara cells are specialized lung cells.
    • Pulmonary surfactant is crucial for lung function.
    • High altitude can affect lung physiology.

    Purpose of the Study:

    • To investigate the morphology of llama Clara cells.
    • To explore the potential role of Clara cells in high-altitude adaptation.
    • To examine surfactant production in llamas at high altitude.

    Main Methods:

    • Light and electron microscopy of llama lung tissue.
    • Analysis of Clara cell morphology and apical caps.
    • Correlation with environmental altitude.

    Main Results:

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    • Llamas at 4,720 m showed numerous, prominent Clara cells.
    • Apical caps containing vesicular endoplasmic reticulum were observed.
    • Extrusion of these caps into terminal bronchioles was noted.
    • The caps likely contain dipalmitoyl lecithin, a pulmonary surfactant.

    Conclusions:

    • Llama Clara cells are abundant and secretory at high altitudes.
    • Persistent secretion of pulmonary surfactant may be essential for llamas.
    • This adaptation could counteract increased lung surface tension at high altitudes.