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Related Experiment Videos

Triglyceride metabolism in the lung

S Yasuoka, T Sakamoto, M Takata

    The Tohoku Journal of Experimental Medicine
    |March 1, 1977
    PubMed
    Summary

    The lung does not store circulating lipids, even after intestinal fat absorption. Instead, the lung primarily utilizes circulating lipids for its own metabolic needs, not for storage.

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    Area of Science:

    • Biochemistry
    • Physiology
    • Cell Biology

    Background:

    • The lung's role in lipid metabolism and storage is not fully understood.
    • Investigating the lung's capacity to act as a depot for circulating lipids, particularly those absorbed from the intestine, is crucial.

    Purpose of the Study:

    • To determine if the lung functions as a storage site for circulating lipids.
    • To compare lipid uptake and metabolism in the lung versus the liver.

    Main Methods:

    • Oral administration of triolein and [3H]palmitic acid to rats and mice.
    • Measurement of triglyceride and fatty acid incorporation into lung and liver tissues.
    • Assay of lipase activity in lung microsomal and soluble fractions.

    Main Results:

    • Lung triglyceride content increased post-oral triolein administration but was significantly lower than in the liver.
    • [3H]palmitic acid uptake by the lung was substantially less than by the liver.
    • Lipids were preferentially incorporated into lung phospholipids, while liver lipids were mainly triglycerides.
    • Lipoprotein lipase was the predominant lipase in lung fractions, unaffected by fasting.

    Conclusions:

    • The lung is not a significant depot for circulating triglycerides, even during intestinal fat absorption.
    • The lung primarily takes up circulating lipids for its own metabolic processes rather than for storage.

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