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Related Experiment Videos

Ethanol selectively affects Na+-gradient dependent intestinal transport systems.

B O'Neill, F Weber, D Hornig

    FEBS Letters
    |January 1, 1986
    PubMed
    Summary
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    Ethanol slows nutrient uptake by Na+-dependent symport systems by affecting passive diffusion and the sodium gradient. This inhibition is observed only when a sodium gradient is present.

    Area of Science:

    • Cellular biology
    • Biochemistry

    Background:

    • Nutrient uptake relies on various transport systems, including sodium (Na+)-dependent symporters.
    • Ethanol's effects on cellular transport mechanisms are not fully understood.

    Purpose of the Study:

    • To investigate the impact of ethanol on Na+-dependent and Na+-independent nutrient transport systems.
    • To elucidate the mechanism by which ethanol affects nutrient uptake velocities.

    Main Methods:

    • Assessing the uptake of D-glucose, L-alanine, L-ascorbate (Na+-symport), and D-fructose (Na+-independent) in the presence and absence of ethanol.
    • Measuring passive diffusion using L-glucose uptake.
    • Conducting experiments with and without an initial Na+ gradient.

    Main Results:

    Related Experiment Videos

    • Moderate ethanol concentrations reduced uptake velocity for three Na+-symport systems (D-glucose, L-alanine, L-ascorbate) specifically when an Na+ gradient was present.
    • No inhibition was observed in tracer-equilibrium exchange measurements.
    • Ethanol did not inhibit the Na+-independent D-fructose transport system.
    • Ethanol slightly increased the rate of passive diffusion (L-glucose uptake).

    Conclusions:

    • Ethanol's effect on passive diffusion accelerates Na+ gradient collapse.
    • This accelerated gradient collapse leads to reduced uptake velocities in Na+-dependent symport systems.
    • The observed inhibition is a consequence of ethanol's impact on the driving force (Na+ gradient), not a direct inhibition of the transport proteins themselves.