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Related Experiment Videos

Glutamine uptake by rat renal basolateral membrane vesicles

R A Reynolds, H Wald, S Segal

    Bioscience Reports
    |November 1, 1982
    PubMed
    Summary

    Rat renal cortex exhibits sodium-dependent L-glutamine uptake via two distinct transport systems. Lysine and other amino acids significantly influence this crucial nutrient transport process.

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    Area of Science:

    • Nephrology
    • Renal Physiology
    • Amino Acid Transport

    Background:

    • L-glutamine is a vital amino acid for renal function.
    • Understanding its transport is key to renal physiology.

    Purpose of the Study:

    • To characterize the L-glutamine uptake mechanism in rat renal cortex.
    • To identify the kinetic properties and regulatory factors of L-glutamine transport.

    Main Methods:

    • Investigated L-glutamine uptake in basolateral membranes of rat renal cortex.
    • Performed concentration-dependence studies to determine kinetic parameters.
    • Utilized amino acid inhibitors to probe transport system characteristics.

    Main Results:

    • Identified a sodium-dependent, saturable L-glutamine uptake process.
    • Characterized two transport systems: a high-affinity, low-capacity system (Km1=0.032 mM, V1=0.028 nmol/mg/min) and a low-affinity, high-capacity system (Km2=17.6 mM, V2=17.6 nmol/mg/min).
    • Lysine completely inhibited the high-affinity system and partially inhibited the low-affinity system. Cystine and other dibasic amino acids also affected uptake.

    Conclusions:

    • Rat renal cortex possesses at least two distinct L-glutamine transport systems.
    • These systems exhibit different affinities and capacities, modulated by specific amino acids like lysine.

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