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Inhibition of BKCa negatively alters cardiovascular function

Nishi H Patel1, Justin Johannesen1, Kajol Shah2

  • 1Department of Internal Medicine, Drexel University College of Medicine, Philadelphia, Pennsylvania.

Physiological Reports
|June 23, 2018
PubMed

Insights

Large conductance calcium-activated potassium channels (BKCa) regulate heart rate and blood vessel function. Blocking these channels rapidly impacts cardiovascular function, suggesting their potential as therapeutic targets.

Area of Science:

  • Cardiovascular Physiology
  • Ion Channel Function
  • Pharmacology

Background:

  • Large conductance calcium and voltage-activated potassium channels (BKCa) are vital transmembrane proteins involved in cellular physiology.
  • BKCa channels influence heart rate, protect against ischemia-reperfusion injury, and regulate vascular tone via vasodilation.
  • While ex vivo studies highlight their role in blood vessels, the in vivo cardiovascular function of BKCa channels remains incompletely understood.

Purpose of the Study:

  • To investigate the rapid in vivo role of BKCa channels in regulating cardiovascular function.
  • To assess the impact of potent BKCa channel blockers on cardiac and vascular parameters.

Main Methods:

  • Utilized two established, rapid-acting BKCa channel blockers: paxilline and iberiotoxin.
  • Evaluated the in vivo effects of these blockers on cardiovascular parameters in a relevant model.

Main Results:

  • BKCa channels were found to be actively involved in regulating heart rate.
  • The function of both the left and right heart, as well as major blood vessels, was significantly influenced by BKCa channel activity.
  • The observed effects of the blockers on BKCa channels were completely reversible.

Conclusions:

  • BKCa channels play a significant in vivo role in regulating overall cardiovascular function.
  • The rapid and reversible effects observed suggest that BKCa channels represent promising targets for clinical applications aimed at modulating heart rate and cardiac contractility.

Keywords:
BKCa channelscardiac functionechocardiographypaxilline

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