Role of potassium channels in coronary vasodilation

Gregory M. Dick, Johnathan D. Tune

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

K+ channels in coronary arterial smooth muscle cells (CASMC) determine the resting membrane potential (Em) and serve as targets of endogenous and therapeutic vasodilators. Em in CASMC is in the voltage range for activation of L-type Ca2+ channels; therefore, when K+ channel activity changes, Ca2+ influx and arterial tone change. This is why both Ca2+ channel blockers and K+ channel openers have such profound effects on coronary blood flow; the former directly inhibits Ca2+ influx through L-type Ca2+ channels, while the latter indirectly inhibits Ca2+influx by hyperpolarizing Em and reducing Ca2+ channel activity. K+ channels in CASMC play important roles in vasodilation to endothelial, ischemic and metabolic stimuli. The purpose of this article is to review the types of K+ channels expressed in CASMC, discuss the regulation of their activity by physiological mechanisms and examine impairments related to cardiovascular disease.

Original languageEnglish (US)
Pages (from-to)10-22
Number of pages13
JournalExperimental Biology and Medicine
Volume235
Issue number1
DOIs
StatePublished - Jan 1 2010

Fingerprint

Potassium Channels
Vasodilation
Smooth Muscle Myocytes
Muscle
Vasodilator Agents
Membrane Potentials
Blood
Cardiovascular Diseases
Chemical activation
Cells
Membranes
Electric potential
Therapeutics

Keywords

  • ATP-dependent K channel
  • Coronary blood flow
  • Coronary vascular smooth muscle
  • Large conductance Ca- and voltage-activated k channel
  • Voltage-gated K channel

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Role of potassium channels in coronary vasodilation. / Dick, Gregory M.; Tune, Johnathan D.

In: Experimental Biology and Medicine, Vol. 235, No. 1, 01.01.2010, p. 10-22.

Research output: Contribution to journalShort survey

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