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Ion channels in urinary bladder.

S M Frings1, R D Purves, A D Macknight

  • 1Department of Physiology, University of Otago Medical School, Dunedin, New Zealand.

Renal Physiology and Biochemistry
|January 1, 1990
PubMed
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Urinary epithelia use ion channels for transport. Mammalian bladders replenish sodium channels degraded by urine enzymes, while amphibian bladders show potential chloride channel activity.

Area of Science:

  • Urology
  • Cell Biology
  • Physiology

Background:

  • Urinary epithelia form a barrier between urine and interstitial fluid.
  • Ion and water absorption from urine is crucial for fluid and electrolyte balance, especially in lower vertebrates.
  • Transepithelial ion transport relies on a balance of membrane transport pathways, including ion channels.

Purpose of the Study:

  • To investigate the types and functions of ion channels in urinary epithelia.
  • To understand the mechanisms of ion transport and cellular homeostasis in mammalian and amphibian bladders.
  • To explore the regulation and replenishment of ion channels in urinary epithelia.

Main Methods:

  • Identification of ion channels in apical and basolateral membranes of urinary epithelia.

Related Experiment Videos

  • Characterization of sodium channels in mammalian bladder apical membranes (e.g., amiloride-sensitive, low conductance).
  • Patch clamp studies to investigate ion channel activity, including chloride channels in mammalian and amphibian bladder basolateral membranes.

    • Main Results:

    • Mammalian bladder apical membranes possess amiloride-sensitive sodium channels (5-10 pS) that are degraded by urinary enzymes and replenished from cytoplasmic stores.
    • Higher conductance, less selective ion channels exist in both mammalian and amphibian bladders, though their physiological roles are unclear.
    • Mammalian bladder basolateral membranes exhibit significant chloride conductance (approx. 60 pS) via specific chloride channels, while amphibian bladders show evidence of basolateral chloride conductance.

    Conclusions:

    • Urinary epithelia utilize diverse ion channels for transepithelial transport and maintaining cellular homeostasis.
    • Mammalian bladders have mechanisms to regulate sodium channel integrity against urinary degradation.
    • Further research is needed to elucidate the physiological significance of various identified ion channels, particularly in amphibian bladders.