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Related Experiment Videos

Solute transport process in intestinal epithelial cells.

Y Okada

    Membrane Biochemistry
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Active solute transport in rat intestine causes mucosal membrane depolarization and serosal membrane hyperpolarization. This study quantizes ion transport ratios, revealing insights into intestinal epithelial cell function.

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    Area of Science:

    • Physiology
    • Molecular Biology
    • Biophysics

    Background:

    • Active transport of organic solutes in the small intestine influences epithelial cell membrane potential.
    • Understanding these electrical changes is crucial for comprehending nutrient absorption and intestinal function.

    Purpose of the Study:

    • To investigate the changes in mucosal and serosal membrane potentials during active solute transport in rat small intestine.
    • To determine the underlying mechanisms and quantify ion transport ratios involved in active glucose transport.

    Main Methods:

    • Measurement of membrane potential and transepithelial potential difference in rat small intestine epithelial cells.
    • Analysis using an equivalent circuit model to calculate changes in membrane electromotive forces (emfs).

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  • Measurement of cell water content and intracellular ion concentrations (Na+, K+) during glucose transport.

    • Main Results:

    • Active solute transport induced mucosal membrane depolarization and significant serosal membrane hyperpolarization.
    • Cell water content increased, while apparent intracellular monovalent ion concentrations decreased during glucose transport.
    • Quantitative analysis suggested a 1:1 coupling ratio for glucose-Na+ entry and a 4:3 ratio for Na+-K+ transport by the serosal sodium pump.

    Conclusions:

    • Serosal membrane hyperpolarization is likely due to the activation of the electrogenic sodium pump.
    • Mucosal membrane depolarization may result from electrogenic cotransport, water inflow, osmotic gradients, and streaming potentials.
    • The study provides quantitative insights into the coupling ratios of key transport mechanisms in intestinal epithelial cells.