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Related Experiment Videos

Cellular lithium and transepithelial transport across toad urinary bladder.

P M Hughes, A D Macknight

    The Journal of Membrane Biology
    |January 1, 1982
    PubMed
    Summary

    Lithium can replace sodium in toad bladders, affecting short-circuit current (SCC). Serosal lithium inhibits SCC by blocking lithium entry across the apical membrane, likely due to cellular lithium accumulation.

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    Area of Science:

    • Physiology
    • Ion Transport

    Background:

    • Sodium transport is crucial for epithelial function.
    • Lithium's effects on ion transport mechanisms are not fully understood.

    Purpose of the Study:

    • To investigate the effects of replacing sodium with lithium on toad urinary bladder function.
    • To elucidate the mechanisms of lithium transport and its impact on short-circuit current (SCC).

    Main Methods:

    • Exposure of toad urinary bladders to lithium-substituted Ringer's solutions on mucosal and/or serosal surfaces.
    • Measurement of short-circuit current (SCC) to assess active ion transport.
    • Analysis of cellular ionic composition to determine ion content and movement.

    Main Results:

    • Mucosal lithium Ringer's with serosal sodium Ringer's caused a 50% decline in SCC, with cellular lithium levels comparable to the sodium transport pool.
    • Serosal lithium Ringer's abolished SCC within 60-120 minutes, regardless of the mucosal cation.
    • Transepithelial lithium movement, not changes in cellular ions, carried the current when both solutions contained lithium.

    Conclusions:

    • Serosal lithium inhibits SCC predominantly by impeding lithium entry across the apical membrane.
    • Cellular lithium accumulation is suggested as the cause of this inhibition.
    • Lithium can serve as a charge carrier in epithelial transport, mimicking sodium's role.

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