Inhibition of CaMKII phosphorylation of RyR2 prevents inducible ventricular arrhythmias in mice with Duchenne muscular dystrophy.
Inhibition of CaMKII phosphorylation of RyR2 prevents inducible ventricular arrhythmias in mice with Duchenne muscular dystrophy.
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DOI:
10.1016/j.hrthm.2012.12.016
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发表时间:
2013-04
期刊:
影响因子:
5.5
通讯作者:
Wehrens, Xander H. T.
中科院分区:
文献类型:
--
作者:
Ather, Sameer;Wang, Wei;Wang, Qiongling;Li, Na;Anderson, Mark E.;Wehrens, Xander H. T.
关键词:
Ventricular tachycardia (VT) is the second most common cause of death in patients with Duchenne muscular dystrophy (DMD). Recent studies have implicated enhanced sarcoplasmic reticulum (SR) Ca2+ leak via ryanodine receptors (RyR2) as a cause of VT in the mdx mouse model of DMD. However, the signaling mechanisms underlying induction of SR Ca2+ leak and VT are poorly understood. To test whether enhanced CaMKII phosphorylation of RyR2 underlies SR Ca2+ leak and induction of VT in mdx mice. Programmed electrical stimulation (PES) was performed on anesthetized mice, and confocal imaging of calcium release events in isolated ventricular myocytes. PES revealed inducible VT in mdx mice, which was inhibited by CaMKII inhibition or mutation S2814A in RyR2. Myocytes from mdx mice exhibited more Ca2+ sparks and Ca2+ waves compared with wild type (WT) mice, in particular at faster pacing rates. Arrhythmogenic Ca2+ waves were inhibited by CaMKII but not PKA inhibition. Moreover, mutation S2814A but not S2808A in RyR2 suppressed spontaneous Ca2+ waves in myocytes from mdx mice. CaMKII blockade and genetic inhibition of RyR2-S2814 phosphorylation prevent VT induction in a mouse model of DMD. In ventricular myocytes from mdx mice, spontaneous Ca2+ sparks and Ca2+ waves can be suppressed by CaMKII inhibition or mutation S2814A in RyR2. Thus, inhibition of CaMKII-induced SR Ca2+ leak might be a new strategy to prevent arrhythmias in patients with DMD without heart failure.
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影响因子:
37.8
作者:
van Oort RJ;Garbino A;Wang W;Dixit SS;Landstrom AP;Gaur N;De Almeida AC;Skapura DG;Rudy Y;Burns AR;Ackerman MJ;Wehrens XH
通讯作者:
Wehrens XH
DOI:
10.1073/pnas.0908540107
发表时间:
2010-01-26
影响因子:
11.1
作者:
Fauconnier, Jeremy;Thireau, Jerome;Lacampagne, Alain
通讯作者:
Lacampagne, Alain
影响因子:
5.5
作者:
Sood, Subeena;Chelu, Mihail G.;Wehrens, Xander H. T.
通讯作者:
Wehrens, Xander H. T.
DOI:
10.3791/1730
发表时间:
2010-05-26
期刊:
Journal of visualized experiments : JoVE
影响因子:
--
作者:
Li, Na;Wehrens, Xander H T
通讯作者:
Wehrens, Xander H T
影响因子:
3.5
作者:
Wehling-Henricks, M;Jordan, MC;Tidball, JG
通讯作者:
Tidball, JG