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Circulation:整合素β1D不足介导RyR2功能不全诱发右心室心肌病室性心动过速

2020-05-10 MedSci原创 MedSci原创

致心律失常性右室心肌病(ARVC)是一种遗传性心脏病,以脂肪浸润、危及生命的心律失常和心脏性猝死风险增加为特征。ARVC患者的治疗指南推荐通过减少心律失常症状来提高生活质量,防止心源性猝死。但ARVC

致心律失常性右室心肌病(ARVC)是一种遗传性心脏病,以脂肪浸润、危及生命的心律失常和心脏性猝死风险增加为特征。ARVC患者的治疗指南推荐通过减少心律失常症状来提高生活质量,防止心源性猝死。但ARVC相关性心律失常的机制尚不清楚。

通过蛋白质质谱分析,研究人员发现,在Ca2+处理蛋白质无改变的ARVC心脏中,整合素β1表达下调。

通过免疫印迹实验,研究人员发现ARVC患者左心室组织的整合素β1D不足、RyR2 Ser-2030高磷酸化,但在缺血性或肥厚性心肌病患者心脏组织中无此现象。采用脂质双膜片钳单通道记录,研究人员发现纯化的整合素β1D可通过减少RyR2开放概率、平均开放时间和增加平均关闭时间来稳定RyR2功能。此外, β1D敲除小鼠的心脏功能和形态正常,但会表现出以儿茶酚胺敏感的多型室性心动过速,与在β1D敲除心肌细胞中RyR2 ser - 2030磷酸化增加和Ca2+处理蛋白异常一致。

在机制上,研究人员发现桥粒蛋白(DSP)缺失,通过ERK1/2-纤连蛋白-泛素/溶酶体通路诱发ARVC整合素β1D缺乏。

本研究表明,整合素β1D不足代表了ARVC患者心室心律失常风险增高的一种新型潜在机制。

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