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Related Experiment Videos

Apical and basolateral membrane ionic channels in rabbit urinary bladder epithelium.

S A Lewis, J W Hanrahan

    Pflugers Archiv : European Journal of Physiology
    |January 1, 1985
    PubMed
    Summary

    This study reviews rabbit urinary bladder ion channels. Amiloride-sensitive sodium channels are regulated by urokinase, affecting sodium transport.

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    Area of Science:

    • Physiology
    • Molecular Biology
    • Biophysics

    Background:

    • The rabbit urinary bladder epithelium regulates transepithelial sodium transport.
    • Ion channel activity in the apical and basolateral membranes is crucial for this process.

    Purpose of the Study:

    • To review the properties and regulation of amiloride-sensitive Na+ channels in the apical membrane.
    • To investigate Cl- and K+ channels in the basolateral membrane.
    • To understand how these channels regulate transepithelial Na+ transport.

    Main Methods:

    • Patch clamp technique was used to study single ion channels.
    • Fluctuation analysis was employed to determine channel density and conductance.
    • Kinetic and selectivity properties of basolateral channels were analyzed.

    Main Results:

    • An average of one amiloride-sensitive Na+ channel exists per 40 micron2 of apical membrane.
    • Each Na+ channel conducts 0.7 pA of current under short-circuit conditions.
    • Urokinase hydrolyzes apical Na+ channels, leading to loss of amiloride sensitivity and instability.

    Conclusions:

    • Urokinase plays a regulatory role in apical Na+ channel function.
    • Basolateral Cl- and K+ channels contribute to the overall regulation of transepithelial Na+ transport.
    • Understanding these channel properties is key to comprehending urinary bladder physiology.

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