Rv3033, as an Emerging Anti-apoptosis Factor, Facilitates Mycobacteria Survival via Inhibiting Macrophage Intrinsic Apoptosis.

Rv3033, as an Emerging Anti-apoptosis Factor, Facilitates Mycobacteria Survival via Inhibiting Macrophage Intrinsic Apoptosis.
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Rv3033 作为一种新兴的抗凋亡因子,通过抑制巨噬细胞内在凋亡促进分枝杆菌存活

DOI:
10.3389/fimmu.2018.02136
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发表时间:
2018
影响因子:
7.3
通讯作者:
Xiong S
Xiong S
中科院分区:
医学2区
文献类型:
--
作者:
Zhang W;Lu Q;Dong Y;Yue Y;Xiong S

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细胞凋亡抑制是分枝杆菌促进其在巨噬细胞中存活的关键策略,但其潜在机制尚未完全明确。在本研究中,我们发现Rv3033(一种分枝杆菌分泌的毒力因子)在杆菌于巨噬细胞内的存活中起重要作用。在巨噬细胞中强制过表达Rv3033能够有效抵抗分枝杆菌诱导的早期和晚期细胞凋亡,同时细胞内细菌负荷明显增加。通过探究潜在机制,我们发现Rv3033在分枝杆菌感染的巨噬细胞中有效抑制内源性(半胱天冬酶 - 9介导的)凋亡途径,但不抑制外源性(半胱天冬酶 - 8介导的)凋亡途径。并且这种抑制依赖于对线粒体细胞色素c释放和内质网(ER)应激PERK分支激活的协同阻断。我们的研究揭示了分枝杆菌毒力因子Rv3033作为一种抗凋亡蛋白的新功能,这可能为结核病(TB)治疗提供一个新靶点。
Apoptosis inhibition is a critical strategy of mycobacteria facilitating its survival in macrophages, but the underlying mechanism is not completely understood. In this study, we found that Rv3033, a secreted virulence factor of mycobacteria, played an important role in bacillary survival within macrophages. Forced over-expressed of Rv3033 in macrophages could efficiently resist mycobacteria-induced early and late apoptosis, accompanied with the obvious increased cellular bacterial burden. By exploring the underlying mechanism, we found that Rv3033 efficiently repressed the intrinsic (caspase-9 meditated), but not the extrinsic (caspase-8 mediated) apoptotic pathway in mycobacteria-infected macrophages. And this repression relied on the orchestrating blockade of both mitochondrial cytochrome c release and endoplasmic reticulum (ER) stress PERK branch activation. Our study uncovered a novel function of mycobacterial virulence factor Rv3033 as an anti-apoptotic protein, which may provide a new target for tuberculosis (TB) treatment.
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