Apoptotic caspases prevent the induction of type I interferons by mitochondrial DNA.

Apoptotic caspases prevent the induction of type I interferons by mitochondrial DNA.
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DOI:
10.1016/j.cell.2014.11.037
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发表时间:
2014-12-18
期刊:
影响因子:
64.5
通讯作者:
Flavell RA
Flavell RA
中科院分区:
生物学1区
文献类型:
--
作者:
Rongvaux A;Jackson R;Harman CC;Li T;West AP;de Zoete MR;Wu Y;Yordy B;Lakhani SA;Kuan CY;Taniguchi T;Shadel GS;Chen ZJ;Iwasaki A;Flavell RA

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The mechanism by which cells undergo death determines whether dying cells trigger inflammatory responses or remain immunologically silent. Mitochondria play a central role in the induction of cell death, as well as in immune signaling pathways. Here, we identify of a mechanism by which mitochondria and downstream pro-apoptotic caspases regulate the activation of antiviral immunity. In the absence of active caspases, mitochondrial outer membrane permeabilization by Bax and Bak results in the expression of type I interferons (IFNs). This induction is mediated by mitochondrial DNA-dependent activation of the cGAS/STING pathway and results in the establishment of a potent state of viral resistance. Our results show that mitochondria have the capacity to simultaneously expose a cell-intrinsic inducer of the IFN response, and to inactivate this response in a caspase-dependent manner. This mechanism provides a dual control, which determines whether mitochondria initiate an immunologically silent or a pro-inflammatory type of cell death.
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