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J Am Coll Cardiol. 2018 Apr 3;71(13):1459-1470. doi: 10.1016/j.jacc.2018.01.060.

Role of Stress Kinase JNK in Binge Alcohol-Evoked Atrial Arrhythmia.

Author information

1
Department of Physiology and Biophysics, Rush University Medical Center, Chicago, Illinois; Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, Illinois.
2
Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, Illinois.
3
Department of Physiology and Biophysics, Rush University Medical Center, Chicago, Illinois.
4
Division of Cardiovascular Medicine, Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa.
5
Department of Biomedical Sciences, New York Institute of Technology, College of Osteopathic Medicine, Old Westbury, New York.
6
Department of Physiology and Biophysics, Rush University Medical Center, Chicago, Illinois; Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, Illinois. Electronic address: xun_ai@rush.edu.

Erratum in

Abstract

BACKGROUND:

Excessive binge alcohol drinking has acute cardiac arrhythmogenic effects, including promotion of atrial fibrillation (AF), which underlies "Holiday Heart Syndrome." The mechanism that couples binge alcohol abuse with AF susceptibility remains unclear. We previously reported stress-activated c-Jun N-terminal kinase (JNK) signaling contributes to AF development. This is interesting because JNK is implicated in alcohol-caused organ malfunction beyond the heart.

OBJECTIVES:

The purpose of this study was to detail how JNK promotes binge alcohol-evoked susceptibility to AF.

METHODS:

The authors found binge alcohol-exposure leads to activated JNK, specifically JNK2. Furthermore, binge alcohol induces AF (24- vs. 1.8-Hz burst pacing-induced episodes per attempt per animal), higher incidence of diastolic intracellular Ca2+ activity (Ca2+ waves, sarcoplasmic reticulum [SR] Ca2+ leakage), and membrane voltage (Vm) and systolic Ca2+ release spatiotemporal heterogeneity (ΔtVm-Ca). These changes were completely eliminated by JNK inhibition both in vivo and in vitro. calmodulin kinase II (CaMKII) is a proarrhythmic molecule known to drive SR Ca2+ mishandling.

RESULTS:

The authors report for the first time that binge alcohol activates JNK2, which subsequently phosphorylates the CaMKII protein, enhancing CaMKII-driven SR Ca2+ mishandling. CaMKII inhibition eliminates binge alcohol-evoked arrhythmic activities.

CONCLUSIONS:

Our studies demonstrate that binge alcohol exposure activates JNK2 in atria, which then drives CaMKII activation, prompting aberrant Ca2+ waves and, thus, enhanced susceptibility to atrial arrhythmia. Our results reveal a previously unrecognized form of alcohol-driven kinase-on-kinase proarrhythmic crosstalk. Atrial JNK2 function represents a potential novel therapeutic target to treat and/or prevent AF.

KEYWORDS:

AF vulnerability; JNK; arrhythmic calcium activity; binge alcohol drinking; kinase inhibition; proarrhythmic calmodulin kinase II; stress-response kinase

Comment in

PMID:
29598867
PMCID:
PMC5903584
DOI:
10.1016/j.jacc.2018.01.060
[Indexed for MEDLINE]
Free PMC Article

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