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Related Experiment Videos

Transient current changes and Na compartimentalization in frog skin epithelium.

F Morel, G Leblanc

    Pflugers Archiv : European Journal of Physiology
    |July 21, 1975
    PubMed
    Summary

    Frog skin epithelia exhibit transient current responses to sodium (Na) and lithium (Li) ion additions. Analysis reveals two distinct compartments involved in transepithelial Na transport, with differing filling rates and accessibility.

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    Area of Science:

    • Physiology
    • Membrane Transport
    • Ion Channels

    Background:

    • The frog skin epithelium is a model system for studying epithelial sodium transport.
    • Understanding the kinetics of ion transport is crucial for elucidating cellular mechanisms.

    Purpose of the Study:

    • To investigate the transient current responses in isolated frog skin epithelia upon addition of sodium (Na) and lithium (Li) ions.
    • To analyze the kinetic components of these responses and their dependence on experimental conditions.

    Main Methods:

    • Measurements of transient and positive current responses across isolated frog skin epithelia.
    • Addition of Na and Li ions to outer bathing solutions and subsequent removal.
    • Analysis of current responses using exponential term equations.

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  • Testing the effects of ouabain, Amiloride, oxytocin, and different anions (Cl vs. SO4(2)-).

    • Main Results:

    • Transient current responses were observed upon Na/Li addition and removal, with directionality dependent on ion-free conditions.
    • Na addition to non-ouabain treated preparations showed a single fast exponential component.
    • Ouabain treatment or Li addition required a two-exponential model (fast and slow components).
    • Responses were unaffected by anion substitution but blocked by Amiloride and enhanced by oxytocin.

    Conclusions:

    • The frog skin epithelium contains at least two communicating compartments with differential accessibility.
    • A fast-filling compartment (0.5 min) is directly involved in transepithelial Na transport.
    • A slower-filling compartment (4-7 min) is involved when basal pump activity is reduced.