Murine coronavirus-induced apoptosis in 17Cl-1 cells involves a mitochondria-mediated pathway and its downstream caspase-8 activation and bid cleavage.

Murine coronavirus-induced apoptosis in 17Cl-1 cells involves a mitochondria-mediated pathway and its downstream caspase-8 activation and bid cleavage.
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DOI:
10.1006/viro.2002.1626
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发表时间:
2002-10-25
期刊:
影响因子:
3.7
通讯作者:
Makino S
Makino S
中科院分区:
医学3区
文献类型:
--
作者:
Chen CJ;Makino S

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小鼠肝炎病毒 (MHV) 感染小鼠 17Cl-1 细胞会导致细胞凋亡。 Pancaspase 抑制剂 Z-VAD-FMK 对 MHV 诱导的细胞凋亡的抑制促进了感染后期病毒的产生,表明细胞凋亡可能是限制病毒后代产生的宿主反应。 Caspase-9 的激活和 Bcl-2 过表达延迟细胞凋亡表明线粒体介导的细胞凋亡途径的激活。对细胞色素 c、procaspase-9 和 Apaf-1 的亚细胞分布的分析表明,线粒体附近存在异常的凋亡体形成,这可能是细胞类型特异性事件。 Fas (APO-1/CD95) 量的增加、caspase-8 激活、caspase-8 介导的 Bid 裂解以及随后截短的 Bid 易位至线粒体,所有这些都与 Fas 介导的途径相关,也发生在 MHV 感染的 17Cl-1 细胞中,而死亡诱导信号复合物的形成,直接表明 Fas 介导的途径无法检测到。 Caspase-8 和 Bid 激活似乎位于线粒体下游,因为 Bcl-2 过表达抑制了这两个事件,表明受感染的 17Cl-1 细胞可能激活了受体介导的“II 型”信号通路,其中初级和低水平的受体介导通路激活导致线粒体介导通路的激活。我们所有的数据表明,线粒体介导的途径在 MHV 感染的 17Cl-1 细胞的细胞凋亡中发挥着主要的调节作用。
Mouse hepatitis virus (MHV) infection in murine 17Cl-1 cells results in apoptotic cell death. Inhibition of MHV-induced apoptosis by the pancaspase inhibitor Z-VAD-FMK promoted virus production late in infection, indicating that apoptosis could be a host response to limit the production of viral progeny. Activation of the mitochondria-mediated apoptotic pathway was indicated by the activation of caspase-9 and delay of apoptosis by Bcl-2 overexpression. Analyses of the subcellular distribution of cytochrome c, procaspase-9, and Apaf-1 suggested an aberrant apoptosome formation in the vicinity of the mitochondria, which could be a cell type-specific event. An increase in the amount of Fas (APO-1/CD95), caspase-8 activation, caspase-8-mediated Bid cleavage, and subsequent translocation of truncated Bid to mitochondria, all of which relate to the Fas-mediated pathway, also occurred in MHV-infected 17Cl-1 cells, whereas the formation of the death-inducing signaling complex, a direct indication of the activation of Fas-mediated pathway, was undetectable. Caspase-8 and Bid activation appeared to be downstream of mitochondria, because Bcl-2 overexpression suppressed both events, suggesting that infected 17Cl-1 cells might have activated a receptor-mediated “type II” signaling pathway, in which primary and low levels of receptor-mediated pathway activation lead to the activation of the mitochondria-mediated pathway. All our data indicate that a mitochondria-mediated pathway played a major regulatory role in apoptosis in MHV-infected 17Cl-1 cells.
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