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Related Experiment Videos

Plasma membrane changes associated with rat liver regeneration.

G Bruscalupi, G Curatola, G Lenaz

    Biochimica Et Biophysica Acta
    |April 10, 1980
    PubMed
    Summary

    Liver regeneration alters plasma membrane fluidity by decreasing the cholesterol/phospholipid ratio. This change, particularly evident 15 hours post-surgery, may support the liver

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    Area of Science:

    • Hepatology and membrane biophysics.

    Background:

    • Plasma membrane lipid composition and fluidity are critical for cellular function.
    • Liver regeneration involves complex cellular processes, including changes in membrane properties.

    Purpose of the Study:

    • To investigate alterations in plasma membrane lipid composition and fluidity during liver regeneration.
    • To correlate changes in membrane physical properties with the proliferative process.

    Main Methods:

    • Studied plasma membranes at 4, 15, and 24 hours post-partial hepatectomy.
    • Analyzed phospholipid and fatty acid composition, and cholesterol/phospholipid ratio.
    • Assessed membrane fluidity using Electron Paramagnetic Resonance (EPR) and enzyme activity (Mg2+-ATPase, (Na+ + K+)-ATPase, 5'nucleotidase).

    Main Results:

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    • Phospholipid and fatty acid composition remained unchanged.
    • A decreased cholesterol/phospholipid ratio was observed.
    • Surgical stress initially increased fluidity, with reduced effect later.
    • Significant increase in membrane fluidity observed 15 hours post-hepatectomy, indicated by surface fluidity, cholesterol/phospholipid ratio, and 5'-nucleotidase activity.

    Conclusions:

    • Liver regeneration significantly modifies plasma membrane fluidity.
    • The observed increase in fluidity at 15 hours post-hepatectomy is linked to the proliferative process.
    • Changes in membrane properties may play a role in regulating liver cell proliferation.