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Related Experiment Videos

Vanadate and ouabain: a comparative study in toad skin.

J Aboulafia, F Lacaz-Vieira

    Pflugers Archiv : European Journal of Physiology
    |June 1, 1984
    PubMed
    Summary

    Ouabain and vanadate, inhibitors of Na,K-ATPase, both reduce toad skin electrical current. Vanadate uniquely increases skin permeability and resistance, suggesting it targets junctional structures rather than the Na,K-ATPase enzyme itself.

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    Area of Science:

    • Physiology
    • Cell Biology
    • Membrane Transport

    Background:

    • The Na,K-ATPase is crucial for maintaining ion gradients and cell function.
    • Inhibitors like ouabain and vanadate are used to study Na,K-ATPase activity.
    • Toad skin is a model system for studying epithelial transport.

    Purpose of the Study:

    • To compare the effects of ouabain and vanadate on toad skin transport properties.
    • To elucidate the mechanisms by which these inhibitors affect skin electrical resistance and permeability.
    • To investigate the potential targets and pathways involved in vanadate's action.

    Main Methods:

    • Isolated short-circuited toad skin preparation.
    • Application of ouabain and vanadate to assess their effects.
    • Measurement of short-circuit current (SCC) and electrical resistance (R).
    • Analysis of 42K and 14C sucrose effluxes to determine skin permeability.
    • Pre-treatment with DIDS and ouabain to investigate vanadate's mechanism.

    Main Results:

    • Both ouabain and vanadate decreased SCC similarly.
    • Vanadate caused a rapid increase in R, while ouabain's effect was slower and progressive.
    • Vanadate, but not ouabain, increased skin permeability (JK eff, J suc eff).
    • Vanadate's effects on permeability were independent of anion-exchange (DIDS) and Na,K-ATPase inhibition (ouabain).

    Conclusions:

    • Vanadate's actions on toad skin differ significantly from ouabain's.
    • Vanadate appears to act on junctional structures, potentially opening paracellular routes.
    • The mechanism may involve cytosolic Ca2+ balance, cytoskeleton, and tight junction regulation.
    • Vanadate's effects are not mediated by direct Na,K-ATPase inhibition in this context.

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