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Related Experiment Videos

Lactate increases potassium secretion by perfused rat kidney.

M Brezis, K Spokes, P Silva

    The American Journal of Physiology
    |November 1, 1986
    PubMed
    Summary

    L-Lactate significantly increases potassium (K+) secretion in the kidney by stimulating metabolism, potentially preventing hyperkalemia during lactic acidosis. This effect was observed using an isolated perfused rat kidney model.

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    Area of Science:

    • Nephrology
    • Renal Physiology
    • Metabolic Biochemistry

    Background:

    • Exogenous metabolic substrates can influence renal function, including ion transport.
    • Understanding substrate utilization is key to understanding kidney function under various physiological and pathological conditions.

    Purpose of the Study:

    • To investigate the effect of exogenous metabolic substrates, specifically L-lactate, on potassium (K+) secretion in the isolated perfused rat kidney.
    • To determine if L-lactate's effect on K+ secretion is linked to its metabolic utilization.

    Main Methods:

    • Isolated perfused rat kidney model used.
    • Metabolic utilization of glucose and fatty acids inhibited using 2-deoxyglucose and 2-tetradecylglycidic acid.
    • Perfusion with L-lactate, D-lactate, or alpha-ketoglutarate to assess effects on renal oxygen consumption, sodium excretion, and K+ excretion.

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    Main Results:

    • L-Lactate significantly enhanced renal oxygen consumption and markedly increased fractional K+ excretion compared to controls.
    • The poorly metabolized D-lactate isomer did not alter these parameters, suggesting a metabolic basis for L-lactate's effect.
    • L-Lactate perfusion led to a decrease in perfusate K+ concentration, indicating net K+ secretion.

    Conclusions:

    • L-Lactate stimulates renal K+ secretion, likely through preferential metabolic activation of the distal tubule.
    • This mechanism may play a role in preventing hyperkalemia in conditions like lactic acidosis.
    • Metabolically active L-lactate, but not D-lactate, influences renal ion handling.