Circulation:基因疗法| 抑制NADPH氧化酶2可预防房颤发生

2020-10-03 星云 MedSci原创

心房颤动(房颤,AF)是成年人最常见的心律紊乱,也是卒中的主要原因。不幸的是,目前对AF的治疗因为没有针对房颤潜在的分子机制而是次优的。在犬房颤快速心房起搏模型中使用一种非常新颖的基因治疗方法,Yoo

心房颤动(房颤,AF)是成年人最常见的心律紊乱,也是卒中的主要原因。不幸的是,目前对AF的治疗因为没有针对房颤潜在的分子机制而是次优的。在犬房颤快速心房起搏模型中使用一种非常新颖的基因治疗方法,Yoo等证明了NADPH氧化酶2(NOX2)产生的氧化损伤导致一种结构性活性形式的乙酰胆碱依赖性钾电流(IKACh)上调,称为IKH;这不仅是导致房颤发生的重要机制,而且也是维持房颤发生的一个重要机制。

为了解氧化损伤促进和维持房颤发生的机制,研究人员在健康犬心房靶向注射了NOX2短发夹状RNA(随后电穿孔以促进基因传递),然后快速心房起搏。采用体内高密度电形图、心房肌细胞分离、全细胞膜片钳、心房肌细胞体外快速传代、荧光素化学发光法、免疫印迹、实时聚合酶链反应、免疫组织化学、Masson三色染色等方法。
(NOX2 shRNA处理可延长非持续性房颤时间)

结果显示,心房肌细胞氧化损伤的发生是一个频率依赖性的过程,犬心房肌细胞快速起搏是通过NOX2的诱导和线粒体活性氧的产生来诱导氧化损伤的。氧化损伤可能通过PKC(蛋白激酶Cε)的频率依赖性激活的机制来上调IKACh,进而促进AF的电重构。用NOX2短发夹状RNA治疗的狗出现非持续性AF的时间增加了5倍以上。此外,接受NOX2短发夹状RNA治疗的动物在长达12周的时间内没有出现持续性AF。AF预防的电生理机制是延长心房有效不应期,至少部分归因于IKACh的衰减。PKCε的膜转位减弱可能是这种有益的电生理重构的一个可能的分子机制。
(NOX2 shRNA处理明显减少了心房肌内的氧化损伤核)
 
综上所述,NOX2氧化损伤是房颤电重构发生和维持的基础,可以通过一种新的基于基因的方法成功地预防。这一方法的未来优化可能会导致一种新的、机制导向的房颤治疗方法。

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    2021-02-20 ms3000000788774334

    0

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    2020-10-05 pandamao2016
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    2020-10-03 心介

    房颤,临床上碰到很多哦

    0

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    2020-10-03 言西早

    心房颤动(房颤,AF)是成年人最常见的心律紊乱,也是卒中的主要原因。

    0

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