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Related Experiment Videos

Extracellular ascorbic acid in lung

R J Willis, C C Kratzing

    Biochimica Et Biophysica Acta
    |August 24, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Ascorbic acid (vitamin C) readily leaves lung tissue, indicating an extracellular pool. This pool remains even in vitamin C deficiency, suggesting unique lung tissue properties.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Pulmonary Medicine

    Background:

    • Ascorbic acid (vitamin C) is essential for lung health.
    • The distribution and accessibility of ascorbic acid within lung tissue are not fully understood.

    Purpose of the Study:

    • To investigate the release and localization of ascorbic acid in lung tissue.
    • To determine if an extracellular pool of ascorbic acid exists in the lung.

    Main Methods:

    • Incubation of sliced rat and guinea pig lungs with Krebs-phosphate solution.
    • Measurement of lactate dehydrogenase and potassium to assess cell damage.
    • Sephadex chromatography to analyze ascorbic acid binding.
    • Incubation with metabolic poisons to assess ascorbic acid depletion.

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    Main Results:

    • ~50% of ascorbic acid was released from rat lung slices within minutes.
    • Slicing damaged ~20% of lung cells, but released ascorbic acid was not protein-bound.
    • Metabolic poisons depleted ascorbic acid in washed lung slices.
    • ~57-78% of ascorbic acid was released from guinea pig lung slices, irrespective of vitamin C status.

    Conclusions:

    • The lung contains a readily accessible extracellular pool of ascorbic acid.
    • This extracellular pool is maintained even in ascorbic acid deficiency (scurvy).
    • Lung tissue exhibits unique mechanisms for maintaining extracellular vitamin C.