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Updated: May 15, 2025

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Dual role of calcium-activated potassium channels of high conductance: facilitator or limiter of NO-induced arterial

Anastasia A Shvetsova1, Dina K Gaynullina1,2, Johannes Schmid3,4

  • 1Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia.

Frontiers in Physiology
|April 11, 2025
PubMed
Summary
This summary is machine-generated.

High-conductance calcium-activated potassium channels (BKCa) dual role in NO-induced vasodilation was investigated. These channels limit NO’s effect at low contractility but facilitate it at high contractility.

Keywords:
BK channelarterial smooth musclecoronary arteriesnitric oxidesaphenous arterytail arteryvasodilation

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Area of Science:

  • Vascular physiology
  • Ion channel function

Background:

  • High-conductance calcium-activated potassium channels (BKCa) regulate vascular smooth muscle membrane potential and tone.
  • BKCa channels are implicated in nitric oxide (NO)-mediated vasodilation, potentially acting as both facilitators and limiters.

Purpose of the Study:

  • To investigate the dual role of BKCa channels in facilitating and limiting NO-induced vasodilation across different vascular beds.
  • To test the hypothesis that BKCa channels simultaneously act as facilitators and limiters of NO-induced vasodilation.

Main Methods:

  • Wire myography was employed to assess contractile responses in rat tail, saphenous, and coronary arteries.
  • The effects of the NO-donor SNP and the BKCa channel blocker iberiotoxin on contractile responses were evaluated.

Main Results:

  • The NO-donor SNP reduced contractile responses at low agonist concentrations, an effect enhanced by iberiotoxin, indicating BKCa channels limit NO's anticontractile action.
  • At high agonist concentrations, SNP's anticontractile effect was diminished by iberiotoxin, suggesting BKCa channels facilitate NO's anticontractile action.
  • These findings were consistent across multiple arterial types.

Conclusions:

  • BKCa channels exhibit a dual role in NO-induced vasodilation, limiting NO's effect at lower contractility levels and facilitating it at higher levels.
  • The function of BKCa channels as facilitators or limiters of NO's effects is dependent on the vascular contractility level.