Ca2+/calmodulin-dependent protein kinase ii-based regulation of voltage-gated na+ channel in cardiac disease

Olha M. Koval, Jedidiah S. Snyder, Roseanne M. Wolf, Ryan E. Pavlovicz, Patric Glynn, Jerry Curran, Nicholas D. Leymaster, Wen Dun, Patrick J. Wright, Natalia Cardona, Lan Qian, Colleen C. Mitchell, Penelope A. Boyden, Philip F. Binkley, Chenglong Li, Mark E. Anderson, Peter J. Mohler, Thomas J. Hund

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND-: Human gene variants affecting ion channel biophysical activity and/or membrane localization are linked to potentially fatal cardiac arrhythmias. However, the mechanism for many human arrhythmia variants remains undefined despite more than a decade of investigation. Posttranslational modulation of membrane proteins is essential for normal cardiac function. Importantly, aberrant myocyte signaling has been linked to defects in cardiac ion channel posttranslational modifications and disease. We recently identified a novel pathway for posttranslational regulation of the primary cardiac voltage-gated Na channel (Nav1.5) by Ca/calmodulin-dependent protein kinase II (CaMKII). However, a role for this pathway in cardiac disease has not been evaluated. METHODS AND RESULTS-: We evaluated the role of CaMKII-dependent phosphorylation in human genetic and acquired disease. We report an unexpected link between a short motif in the Nav1.5 DI-DII loop, recently shown to be critical for CaMKII-dependent phosphorylation, and Nav1.5 function in monogenic arrhythmia and common heart disease. Experiments in heterologous cells and primary ventricular cardiomyocytes demonstrate that the human arrhythmia susceptibility variants (A572D and Q573E) alter CaMKII-dependent regulation of Nav1.5, resulting in abnormal channel activity and cell excitability. In silico analysis reveals that these variants functionally mimic the phosphorylated channel, resulting in increased susceptibility to arrhythmia-triggering afterdepolarizations. Finally, we report that this same motif is aberrantly regulated in a large-animal model of acquired heart disease and in failing human myocardium. CONCLUSIONS-: We identify the mechanism for 2 human arrhythmia variants that affect Nav1.5 channel activity through direct effects on channel posttranslational modification. We propose that the CaMKII phosphorylation motif in the Nav1.5 DI-DII cytoplasmic loop is a critical nodal point for proarrhythmic changes to Nav1.5 in congenital and acquired cardiac disease.

Original languageEnglish (US)
Pages (from-to)2084-2094
Number of pages11
JournalCirculation
Volume126
Issue number17
DOIs
StatePublished - Oct 23 2012
Externally publishedYes

Keywords

  • arrhythmias, cardiac
  • calcium-calmodulin-dependent protein kinase II
  • heart failure
  • ion channels
  • long QT syndrome
  • myocardial infarction

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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