Circulation:Traf2通过抑制细胞程序性坏死在治疗心衰和心脏病理重塑中起到重要作用!

2017-06-03 MedSci MedSci原创

程序性细胞死亡,包括细胞凋亡、线粒体介导的细胞坏死和程序性坏死,在缺血性心脏损伤、病理性心脏重塑和心力衰竭的进展中起到关键作用。尽管细胞凋亡和线粒体介导的坏死信号传导已经比较明确,但人心脏程序性坏死的调节机制及其在心力衰竭发病机制中的意义尚远未阐明。

程序性细胞死亡,包括细胞凋亡、线粒体介导的细胞坏死和程序性坏死,在缺血性心脏损伤、病理性心脏重塑和心力衰竭的进展中起到关键作用。尽管细胞凋亡和线粒体介导的坏死信号传导已经比较明确,但人心脏程序性坏死的调节机制及其在心力衰竭发病机制中的意义尚远未阐明。

本研究旨在通过转基因小鼠模型探索TNF受体相关受体2(Traf2)在心脏程序性坏死及其在心力衰竭发病机制中的作用,并通过分子和细胞生物学实验阐明其在程序性坏死信号通路中的作用。

研究发现,心脏特异性敲除Traf2小鼠可以引发心脏细胞程序性坏死、病理性重塑和心衰。Traf2敲除小鼠血浆的TNFα水平显着升高,而TNFR1基因的下调显着消除了与Traf2敲除相关的病理性心脏重塑和功能障碍。 进一步研究发现,Traf2可以衔接蛋白TRADD作为上游调节因子,TAK1为下游靶标,严格调控RIP1-RIP3-MLKL神经递质信号转导。 重要的是,RIP3的基因敲除很大程度上弥补了Traf2敲除引发的心脏表型,验证了程序性坏死在调节病理重塑和心力衰竭中的关键作用。

Traf2可以通过抑制程序性坏死起到保护心脏功能的重要作用。这可为心脏的病理性重塑和心衰的治疗提供新的靶点。

原始出处:
Xiao.G et al.Cardioprotective Role of TRAF2 by Suppressing Apoptosis and Necroptosis. Circulation. 2017 June 1. Doi: https://doi.org/10.1161/CIRCULATIONAHA.116.026240

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    2017-06-27 bsmagic9140
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    2017-06-05 millore

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