Dengue activates mTORC2 signaling to counteract apoptosis and maximize viral replication.

Dengue activates mTORC2 signaling to counteract apoptosis and maximize viral replication.
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DOI:
10.3389/fcimb.2022.979996
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发表时间:
2022
影响因子:
5.7
通讯作者:
Aitchison, John D.
Aitchison, John D.
中科院分区:
医学2区
文献类型:
--
作者:
Carter, Christoph C.;Mast, Fred D.;Olivier, Jean Paul;Bourgeois, Natasha M.;Kaushansky, Alexis;Aitchison, John D.

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雷帕霉素的机制靶点(mTOR)在两种不同的复合物中发挥作用:mTORC 1和mTORC 2。mTORC 1与包括登革热在内的黄病毒的发病机制有关,它有助于建立前病毒自噬状态。mTORC 2的激活发生在感染某些病毒后,但其在病毒发病机制中的功能作用仍然知之甚少。在这项研究中,我们探讨了登革非结构蛋白5(NS 5)和宿主细胞mTOR蛋白在感染过程中的物理蛋白质-蛋白质相互作用的后果。使用shRNA差异靶向mTORC 1和mTORC 2复合物,我们表明mTORC 2是最佳登革热复制所需的。此外,我们发现mTORC 2在病毒复制过程中被激活,并且mTORC 2抵消病毒诱导的细胞凋亡,促进受感染细胞的存活。这项工作揭示了一种新的机制,通过这种机制,登革黄病毒可以促进细胞存活,以最大限度地提高病毒复制。
The mechanistic target of rapamycin (mTOR) functions in two distinct complexes: mTORC1, and mTORC2. mTORC1 has been implicated in the pathogenesis of flaviviruses including dengue, where it contributes to the establishment of a pro-viral autophagic state. Activation of mTORC2 occurs upon infection with some viruses, but its functional role in viral pathogenesis remains poorly understood. In this study, we explore the consequences of a physical protein-protein interaction between dengue non-structural protein 5 (NS5) and host cell mTOR proteins during infection. Using shRNA to differentially target mTORC1 and mTORC2 complexes, we show that mTORC2 is required for optimal dengue replication. Furthermore, we show that mTORC2 is activated during viral replication, and that mTORC2 counteracts virus-induced apoptosis, promoting the survival of infected cells. This work reveals a novel mechanism by which the dengue flavivirus can promote cell survival to maximize viral replication.
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