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Related Experiment Video

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Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
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KCNE2 modulates cardiac L-type Ca(2+) channel.

Wenjuan Liu1, Jianxin Deng2, Gang Wang1

  • 1Department of Pathophysiology, School of Medicine, Shenzhen University, Shenzhen 518060, China.

Journal of Molecular and Cellular Cardiology
|April 1, 2014
PubMed
Summary

KCNE2 protein regulates cardiac L-type calcium channels (ICa,L), impacting heart electrical stability. A mutation (R27C) in KCNE2 may contribute to atrial fibrillation by overly suppressing ICa,L.

Keywords:
Ca(v)1.2Familial atrial fibrillationKCNE2KCNE2 mutationL-type Ca(2+) current

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Electromechanical Assessment of Optogenetically Modulated Cardiomyocyte Activity
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Area of Science:

  • Cardiovascular Physiology
  • Molecular Cardiology
  • Ion Channel Regulation

Background:

  • KCNE2 is crucial for cardiac electrical stability, with mutations linked to arrhythmias like long-QT syndrome and atrial fibrillation.
  • KCNE2 is known to interact with various ion channels, but its role in regulating cardiac L-type calcium channels (LCCs) was unclear.

Purpose of the Study:

  • To investigate the role of KCNE2 in modulating cardiac L-type calcium channels (ICa,L).
  • To explore the pathophysiological relevance of KCNE2 regulation of ICa,L, particularly concerning familial atrial fibrillation.

Main Methods:

  • Overexpression and knockdown (RNA interference) of KCNE2 in rat cardiomyocytes and HEK 293 cells to assess effects on ICa,L.
  • Electrophysiological recordings to analyze voltage-dependence and inactivation kinetics of ICa,L.
  • Coimmunoprecipitation and colocalization assays to determine physical interaction between KCNE2 and Cav1.2 (the pore-forming subunit of LCCs).
  • Functional analysis of KCNE2 regulation on Cav1.2 with and without its N-terminal inhibitory module (NTI).

Main Results:

  • Overexpression of KCNE2 decreased ICa,L, while knockdown increased it, indicating KCNE2 suppresses LCC activity.
  • KCNE2 altered the voltage-dependence of activation and inactivation, and slowed recovery from inactivation of ICa,L.
  • KCNE2 physically interacted with Cav1.2, and this interaction/regulation was dependent on Cav1.2's NTI module.
  • A familial atrial fibrillation mutation, KCNE2 R27C, enhanced KCNE2's suppressive effect on ICa,L.

Conclusions:

  • KCNE2 modulates cardiac L-type calcium current (ICa,L) by regulating the NTI function of Cav1.2.
  • The KCNE2 R27C mutation may contribute to familial atrial fibrillation by excessively suppressing ICa,L.