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Related Experiment Videos

An electrogenic NA+/K+ pump in the choroid plexus.

T Zeuthen, E M Wright

    Biochimica Et Biophysica Acta
    |August 17, 1978
    PubMed
    Summary

    Researchers studied frog choroid plexus cells, revealing an electrogenic sodium-potassium (Na+/K+) pump. This pump moves 3 sodium ions out for every 2 potassium ions in, crucial for cellular electrical potential.

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    Area of Science:

    • Physiology
    • Cell Biology
    • Neuroscience

    Background:

    • The choroid plexus epithelium is vital for cerebrospinal fluid production and brain homeostasis.
    • Understanding ion transport mechanisms is key to comprehending its physiological role.

    Purpose of the Study:

    • To investigate the electrogenic properties of the Na+/K+ pump in bullfrog choroid plexus epithelial cells.
    • To quantify ion movement across the ventricular membrane.

    Main Methods:

    • Intracellular electrical potential and potassium activity were measured using microelectrodes.
    • Experiments involved applying ouabain and altering potassium concentrations on the ventricular side.

    Main Results:

    • Ouabain induced a 10 mV depolarization and gradual potassium loss.
    • Potassium reintroduction caused a 4 mV hyperpolarization.
    • Data suggests a 3:2 sodium-to-potassium ion transport ratio for the pump.

    Conclusions:

    • The findings support the presence of an electrogenic Na+/K+ pump at the ventricular membrane of choroid plexus cells.
    • The pump actively transports potassium into the cell and sodium into the ventricle.
    • The calculated potassium permeability coefficient is 1.24 x 10^-5 cm/s.

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