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Related Experiment Videos

Improved function with amino acids in the isolated perfused kidney

F H Epstein, J T Brosnan, J D Tange

    The American Journal of Physiology
    |September 1, 1982
    PubMed
    Summary

    Isolated rat kidneys perfused with glucose alone show impaired function and structure. Supplementing with amino acids, particularly those that support glutathione, preserves kidney health and function.

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    Area of Science:

    • Nephrology
    • Biochemistry
    • Physiology

    Background:

    • Glucose alone as a sole substrate leads to reduced kidney function.
    • Glutathione depletion and cellular damage occur in isolated rat kidneys perfused with glucose.

    Purpose of the Study:

    • To investigate the protective effects of amino acids on kidney function and structure during glucose perfusion.
    • To determine the role of glutathione and its precursors in maintaining renal health.

    Main Methods:

    • Isolated rat kidneys were perfused with glucose as the sole substrate.
    • Amino acid supplementation (comprehensive and specific precursors) was administered.
    • Glomerular filtration rate (GFR), fractional sodium reabsorption, renal glutathione content, and structural integrity were assessed.

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    Main Results:

    • Glucose perfusion alone caused a rapid decline in GFR, sodium reabsorption, and glutathione levels, with observed cellular damage.
    • Supplementation with 20 amino acids prevented these declines and preserved renal function and structure for up to 4 hours.
    • Supplementation with glutathione precursors (cysteine, glycine, glutamic acid) improved glutathione levels and concentrating ability but did not fully maintain GFR and sodium reabsorption.

    Conclusions:

    • Amino acid deficiency and subsequent glutathione depletion contribute to renal structural and functional disturbances.
    • Comprehensive amino acid supplementation offers significant protection to the kidney during substrate-limited perfusion.
    • Glutathione plays a crucial role in maintaining kidney integrity and function.