[Ca2+]i-induced augmentation of the inward rectifier potassium current (IK1) in canine and human ventricular myocardium View Full Text


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Article Info

DATE

2013-06-27

AUTHORS

Norbert Nagy, Károly Acsai, Anita Kormos, Zsuzsanna Sebők, Attila S. Farkas, Norbert Jost, Péter P. Nánási, Julius Gy. Papp, András Varró, András Tóth

ABSTRACT

The inward rectifier K+ current (IK1) plays an important role in terminal repolarization and stabilization of the resting potential in cardiac cells. Although IK1 was shown to be sensitive to changes in intracellular Ca2+ concentration ([Ca2+]i), the nature of this Ca2+ sensitivity—in spite of its deep influence on action potential morphology—is controversial. Therefore, we aimed to investigate the effects of a nonadrenergic rise in [Ca2+]i on the amplitude of IK1 in canine and human ventricular myocardium and its consequences on cardiac repolarization. IK1, defined as the current inhibited by 10 μM Ba2+, was significantly increased in isolated canine myocytes following a steady rise in [Ca2+]i. Enhanced IK1 was also observed when [Ca2+]i was not buffered by ethylene glycol tetraacetic acid, and [Ca2+]I transients were generated. This [Ca2+]i-dependent augmentation of IK1 was largely attenuated after inhibition of CaMKII by 1 μM KN-93. Elevation of [Ca2+]o in multicellular canine and human ventricular preparations resulted in shortening of action potentials and acceleration of terminal repolarization. High [Ca2+]o enhanced the action potential lengthening effect of the Ba2+-induced IK1 blockade and attenuated the prolongation of action potentials following a 0.3-μM dofetilide-induced IKr blockade. Blockade of IKs by 0.5 μM HMR-1556 had no significant effect on APD90 in either 2 mM or 4 mM [Ca2+]o. It is concluded that high [Ca2+]i leads to augmentation of the Ba2+-sensitive current in dogs and humans, regardless of the mechanism of the increase. This effect seems to be at least partially mediated by a CaMKII-dependent pathway and may provide an effective endogenous defense against cardiac arrhythmias induced by Ca2+ overload. More... »

PAGES

1621-1635

References to SciGraph publications

  • 1989-01-01. Intracellular Ca modulates K-inward rectification in cardiac myocytes in PFLÜGERS ARCHIV - EUROPEAN JOURNAL OF PHYSIOLOGY
  • 1990-06. Ca modulates outward current throughIK1 channels in THE JOURNAL OF MEMBRANE BIOLOGY
  • 1977-01. Cardiac Purkinje fibres in PFLÜGERS ARCHIV - EUROPEAN JOURNAL OF PHYSIOLOGY
  • 1993-03. Ionic currents and action potentials in rabbit, rat, and guinea pig ventricular myocytes in BASIC RESEARCH IN CARDIOLOGY
  • 2005-06-11. Asymmetrical distribution of ion channels in canine and human left-ventricular wall: epicardium versus midmyocardium in PFLÜGERS ARCHIV - EUROPEAN JOURNAL OF PHYSIOLOGY
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00424-013-1309-x

    DOI

    http://dx.doi.org/10.1007/s00424-013-1309-x

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1037487131

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/23807312


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    28 schema:description The inward rectifier K+ current (IK1) plays an important role in terminal repolarization and stabilization of the resting potential in cardiac cells. Although IK1 was shown to be sensitive to changes in intracellular Ca2+ concentration ([Ca2+]i), the nature of this Ca2+ sensitivity—in spite of its deep influence on action potential morphology—is controversial. Therefore, we aimed to investigate the effects of a nonadrenergic rise in [Ca2+]i on the amplitude of IK1 in canine and human ventricular myocardium and its consequences on cardiac repolarization. IK1, defined as the current inhibited by 10 μM Ba2+, was significantly increased in isolated canine myocytes following a steady rise in [Ca2+]i. Enhanced IK1 was also observed when [Ca2+]i was not buffered by ethylene glycol tetraacetic acid, and [Ca2+]I transients were generated. This [Ca2+]i-dependent augmentation of IK1 was largely attenuated after inhibition of CaMKII by 1 μM KN-93. Elevation of [Ca2+]o in multicellular canine and human ventricular preparations resulted in shortening of action potentials and acceleration of terminal repolarization. High [Ca2+]o enhanced the action potential lengthening effect of the Ba2+-induced IK1 blockade and attenuated the prolongation of action potentials following a 0.3-μM dofetilide-induced IKr blockade. Blockade of IKs by 0.5 μM HMR-1556 had no significant effect on APD90 in either 2 mM or 4 mM [Ca2+]o. It is concluded that high [Ca2+]i leads to augmentation of the Ba2+-sensitive current in dogs and humans, regardless of the mechanism of the increase. This effect seems to be at least partially mediated by a CaMKII-dependent pathway and may provide an effective endogenous defense against cardiac arrhythmias induced by Ca2+ overload.
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