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Related Experiment Videos

Glomerulotubular function in cyclosporine A treated rats.

H Dieperink, P P Leyssac, E Kemp

    Clinical Nephrology
    |January 1, 1986
    PubMed
    Summary
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    Cyclosporine A (CyA) treatment in rats reduced kidney function, decreasing inulin clearance and altering proximal tubular reabsorption. This immunosuppressant also increased plasma renin concentration, indicating potential renal effects.

    Area of Science:

    • Nephrology
    • Pharmacology
    • Physiology

    Background:

    • Cyclosporine A (CyA) is an immunosuppressant drug with known nephrotoxic potential.
    • Understanding the precise mechanisms of CyA-induced renal dysfunction is crucial for patient management.

    Purpose of the Study:

    • To investigate the effects of varying doses of Cyclosporine A on rat kidney function.
    • To elucidate the impact of CyA on tubular reabsorption and plasma renin concentration.

    Main Methods:

    • 178 rats were administered Cyclosporine A (0-50 mg/kg/day) for 14 days.
    • Kidney function was assessed using clearance methods for inulin, lithium, sodium, and potassium.
    • Serum CyA levels and plasma renin concentration (PRC) were measured.

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    Main Results:

    • Inulin clearance significantly decreased in a dose-dependent manner with CyA administration.
    • Lithium clearance was reduced, indicating impaired proximal tubular reabsorption.
    • Distal sodium and potassium reabsorption were also decreased, likely secondary to proximal tubular dysfunction.
    • Plasma renin concentration increased in CyA-treated groups.

    Conclusions:

    • Cyclosporine A reduces net ultrafiltration pressure in the kidneys.
    • CyA treatment leads to increased fractional proximal tubular reabsorption due to insufficient decrease in absolute reabsorption.
    • Altered renal hemodynamics and tubular function contribute to CyA nephrotoxicity.