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Epithelial sodium channels: characterization by using the patch-clamp technique.

L G Palmer, G Frindt

    Federation Proceedings
    |November 1, 1986
    PubMed
    Summary
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    Researchers identified sodium-selective ion channels in rat kidney tubules. Aldosterone and pH regulate these channels, crucial for sodium reabsorption and blood pressure control.

    Area of Science:

    • Physiology
    • Molecular Biology
    • Nephrology

    Background:

    • The cortical collecting tubule plays a vital role in regulating sodium balance and blood pressure.
    • Ion channels in the apical membrane are critical for sodium transport in the kidney.
    • Aldosterone significantly influences renal sodium handling.

    Purpose of the Study:

    • To characterize the properties of individual sodium-selective ion channels in the rat cortical collecting tubule.
    • To investigate the regulation of these channels by physiological factors like aldosterone, pH, and calcium.

    Main Methods:

    • Patch-clamp electrophysiology was employed to record single-channel currents.
    • Experiments were conducted on cell-attached and inside-out patches from rat cortical collecting tubules.

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  • Ion channel activity was assessed under varying conditions of temperature, ion concentration, pH, and drug application.

    • Main Results:

    • A 5 pS Na-selective ion channel was identified, exhibiting spontaneous openings and closings.
    • Channel conductance increased to 9 pS at physiological temperature (37°C), with faster kinetics.
    • Amiloride blocked the channel, and its activity was enhanced by low-sodium diet-induced aldosterone and cytoplasmic alkalinization (pH 6.4 to 7.4).
    • High cytoplasmic calcium indirectly reduced channel activity.

    Conclusions:

    • The identified channel is likely involved in aldosterone-regulated sodium reabsorption in the kidney.
    • Channel activity is modulated by luminal amiloride, cytoplasmic pH, and indirectly by calcium.
    • These findings elucidate key regulatory mechanisms of renal sodium transport.