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Related Experiment Videos

Low levels of K(ATP) channel activation decrease excitability and contractility of urinary bladder.

G V Petkov1, T J Heppner, A D Bonev

  • 1Department of Pharmacology, The University of Vermont, College of Medicine, Burlington, Vermont 05405, USA.

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|April 11, 2001
PubMed
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Activation of ATP-sensitive potassium (K(ATP)) channels regulates smooth muscle function. Even minimal K(ATP) channel activation significantly inhibits urinary bladder smooth muscle action potentials and contractions.

Area of Science:

  • Physiology
  • Pharmacology
  • Urology

Background:

  • ATP-sensitive potassium (K(ATP)) channels influence smooth muscle function via membrane potential hyperpolarization.
  • Understanding the link between K(ATP) channel activation and tissue response is crucial.

Purpose of the Study:

  • To investigate the relationship between K(ATP) channel activation and urinary bladder smooth muscle (UBSM) function.
  • To examine the effects of synthetic K(ATP) channel activators, ZD-6169 and levcromakalim, on UBSM.

Main Methods:

  • Studied K(ATP) channel currents in isolated UBSM cells.
  • Examined action potentials and phasic contractions in isolated UBSM strips.
  • Utilized synthetic compounds ZD-6169 and levcromakalim to activate K(ATP) channels.

Related Experiment Videos

Main Results:

  • High concentrations of ZD-6169 and levcromakalim (micromolar range) were required for half-maximal activation of K(ATP) currents in single cells.
  • Significantly lower concentrations (nanomolar range) of these compounds inhibited action potentials and phasic contractions in UBSM strips.
  • Less than 1% K(ATP) channel activation sufficed to markedly inhibit UBSM action potentials and contractions.

Conclusions:

  • A small fraction of activated K(ATP) channels can profoundly impact UBSM electrical activity and contractility.
  • The study highlights a critical sensitivity of UBSM function to K(ATP) channel modulation.