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Is the red cell calcium pump electrogenic?

J P Rossi, H J Schatzmann

    The Journal of Physiology
    |June 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    The calcium (Ca2+) pump in human red blood cells is electrogenic, meaning it moves ions across the membrane, creating an electrical charge. This pump

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Membrane Transport

    Background:

    • Human red blood cell membranes contain a Ca2+ pump crucial for calcium homeostasis.
    • Understanding the ion coupling and electrogenicity of this pump is vital for cellular function.

    Purpose of the Study:

    • To investigate the ion transport stoichiometry and electrogenic nature of the Ca2+ pump in human red blood cells.
    • To determine the Ca2+ transport rate and vesicle volume using biophysical methods.

    Main Methods:

    • Utilized inside-out vesicles from human red cell membranes with high potassium permeability.
    • Measured vesicle volume changes via light scattering intensity.
    • Quantified Ca2+ transport using 45Ca uptake assays.

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    Main Results:

    • Replacing chloride (Cl-) with gluconate altered vesicle volume changes from swelling to shrinking, indicating different ion movements.
    • Assumed stoichiometry (2 Cl- per Ca2+ or 2 K+ exchanged for Ca2+) aligned volume changes with direct 45Ca uptake measurements.
    • Demonstrated that Ca2+ transport can switch between Cl- co-transport and K+ counter-transport, ruling out obligatory coupling with other ions.

    Conclusions:

    • The Ca2+ pump in human red blood cells is electrogenic, as it moves ions asymmetrically.
    • The pump's transport stoichiometry is adaptable, not fixed to a specific ion coupling.
    • Determined vesicle volume to be 5-6 µL/mg protein through combined volume and Ca2+ movement measurements.