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Related Experiment Videos

Cell membrane potential and resistance in liver

J Graf, O H Petersen

    The Journal of Physiology
    |November 1, 1978
    PubMed
    Summary

    This study investigated mouse liver cell electrical properties, revealing that extracellular ion concentrations significantly alter membrane resistance and potential. Findings indicate chloride conductance is dominant, influencing cell communication.

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    Area of Science:

    • Hepatocyte electrophysiology
    • Cell membrane biophysics
    • Intercellular communication

    Background:

    • Understanding liver cell electrical properties is crucial for comprehending tissue function.
    • Intercellular junctions facilitate electrical coupling between hepatocytes.
    • Extracellular ion concentrations are known modulators of cell membrane potential.

    Purpose of the Study:

    • To quantify the electrical properties of mouse liver cells, including membrane resistance and space constant.
    • To investigate the impact of varying extracellular ion compositions on hepatocyte electrophysiology.
    • To elucidate the effects of hormones like glucagon and adrenaline on liver cell membrane properties.

    Main Methods:

    • Isolated mouse liver segments were perfused with physiological saline solutions.
    • Microelectrodes were used to inject current and record electrotonic potentials in hepatocytes.
    • Three-dimensional cable analysis was applied to model current spread and analyze spatial decrement.
    • Changes in membrane potential and resistance were measured under different ionic conditions and hormonal stimulation.

    Main Results:

    • The resting membrane potential was -37 mV, with a space constant of 390 µm and intracellular resistance (Ri) of 1.4 kΩcm.
    • Specific membrane resistance (Rm) was calculated to be 5.1 kΩcm².
    • Replacing extracellular Na+ with K+ caused depolarization and decreased resistance; replacement with choline caused hyperpolarization and increased resistance.
    • Replacing extracellular Cl- or NaCl significantly increased membrane resistance.
    • Glucagon and adrenaline induced hyperpolarization and reduced membrane resistance, partly via increased potassium conductance (GK).

    Conclusions:

    • Extracellular ion concentrations, particularly Na+ and Cl-, critically influence hepatocyte membrane potential and resistance.
    • The resting membrane exhibits dominant chloride conductance (GCl), followed by potassium (GK) and sodium (GNa) conductance.
    • Hormonal regulation of liver cell electrophysiology involves alterations in ion permeability, with glucagon potentially increasing GK.

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