在Ser571处的电压通酸化调节晚期电流,心律失常和活体心脏功能
Patric Glynn1, Hassan Musa1, Xiangqiong Wu1
1From Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus (P.G., H.M., X.W., S.D.U., S.L., L.Q., P.J.W., P.B.R., S.G., P.J.M., T.J.H.); Department of Biomedical Engineering, College of Engineering, The Ohio State University, Columbus (P.G., X.W., S.D.U., L.Q., T.J.H.); Departments of Physiology & Cell Biology (H.M., S.L., P.J.W., P.B.R., S.G., P.J.M.) and Internal Medicine (P.J.M., T.J.H.), The Ohio State University Wexner Medical Center, Columbus; and Division of Pharmacy Practice and Administration, College of Pharmacy, The Ohio State University, Columbus (P.B.R.).
这项研究表明,Nav1.5通道中的Ser571对晚期电流 (INa,L) 至关重要,并促进心律失常. 这一发现为CaMKII依赖的INA,L激活和潜在的治疗点提供了洞察力.
科学领域:
- 心血管生理学心血管生理学
- 分子心脏病学分子心脏病学
- 离子通道规则 离子通道规则
背景情况:
- 电压通道 (Nav) 对心脏电活动至关重要.
- 持续的晚期电流 (INa,L) 有助于心脏病.
- 2+) /卡尔莫杜林依赖激酶II (CaMKII) 激活INa,L,但其体内机制尚不清楚.
研究的目的:
- 为了研究Ser571在Nav1.5通道中的体内作用.
- 为了阐明CaMKII依赖的INa,L调节的分子机制.
主要方法:
- 产生了Scn5a敲进的老鼠模型,具有相仿 (S571E) 和废除 (S571A) 的Ser571突变.
- 进行电生理学研究以评估通道功能.
- 评估细胞和动物水平的心脏功能和心律失常易感性.
主要成果:
- 而Ser571是专门调节INa,L的,而不是其他与CaMKII相关的特性.
- 由于Ser571增加的INa,L促进了异常的再极化和Ca2+) 处理.
- 在压力过载引起的心律失常和不适应性重塑中,Ser571是必不可少的.
结论:
- 提供了通过Ser571.1.L对致病性INa,L的CaMKII激活的第一个体内证据.
- 证明了Nav1.5的Ser571依赖调节特别调节INa,L.
- 这些发现支持合理的药物设计,用于针对INa,L的治疗方法.
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