Salmonella-induced caspase-2 activation in macrophages: a novel mechanism in pathogen-mediated apoptosis.

Salmonella-induced caspase-2 activation in macrophages: a novel mechanism in pathogen-mediated apoptosis.
复制标题

DOI:
10.1084/jem.192.7.1035
复制
发表时间:
2000-10-02
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Baccarini M
Baccarini M
中科院分区:
其他
文献类型:
--
作者:
Jesenberger V;Procyk KJ;Yuan J;Reipert S;Baccarini M

文献摘要

参考文献

被引文献

相似文献

沙门氏菌在体内外诱导吞噬细胞凋亡。这些细菌使用专门的III型分泌系统输出毒力因子SipB,其通过靶向半胱天冬酶-1直接激活宿主的凋亡机制。Caspase-1不参与大多数凋亡过程,但在细胞因子成熟中起主要作用。我们发现,caspase-1缺陷型巨噬细胞在感染侵袭性细菌后4-6小时内发生凋亡。这个过程需要SipB,这意味着这种蛋白质可以通过调节与caspase-1不同的组分来启动凋亡机制。侵袭性鼠伤寒沙门氏菌同时靶向caspase-2和caspase-1,但独立于caspase-1。除了caspase-2,caspase-1非依赖性途径涉及caspase-3,-6和-8的活化和细胞色素c从线粒体的释放,其中没有发生在caspase-1依赖性细胞凋亡。通过使用caspase-2敲除巨噬细胞和化学抑制,我们建立了caspase-2在caspase-1依赖性和非依赖性细胞凋亡中的作用。特别地,在快速沙门氏菌诱导的细胞凋亡期间半胱天冬酶-1的活化部分依赖于半胱天冬酶-2。沙门氏菌诱导半胱天冬酶-1-非依赖性巨噬细胞凋亡的能力可能在这种蛋白酶的激活被阻止或与诱导凋亡脱钩的情况下发挥作用。
The enterobacterial pathogen Salmonella induces phagocyte apoptosis in vitro and in vivo. These bacteria use a specialized type III secretion system to export a virulence factor, SipB, which directly activates the host's apoptotic machinery by targeting caspase-1. Caspase-1 is not involved in most apoptotic processes but plays a major role in cytokine maturation. We show that caspase-1–deficient macrophages undergo apoptosis within 4–6 h of infection with invasive bacteria. This process requires SipB, implying that this protein can initiate the apoptotic machinery by regulating components distinct from caspase-1. Invasive Salmonella typhimurium targets caspase-2 simultaneously with, but independently of, caspase-1. Besides caspase-2, the caspase-1–independent pathway involves the activation of caspase-3, -6, and -8 and the release of cytochrome c from mitochondria, none of which occurs during caspase-1–dependent apoptosis. By using caspase-2 knockout macrophages and chemical inhibition, we establish a role for caspase-2 in both caspase-1–dependent and –independent apoptosis. Particularly, activation of caspase-1 during fast Salmonella-induced apoptosis partially relies on caspase-2. The ability of Salmonella to induce caspase-1–independent macrophage apoptosis may play a role in situations in which activation of this protease is either prevented or uncoupled from the induction of apoptosis.
DOI: 10.1074/jbc.274.25.17484
发表时间: 1999-06-18
影响因子: 4.8
作者:
Bossy-Wetzel, E;Green, DR
通讯作者: Green, DR
DOI: 10.1016/s0960-9822(99)80178-x
发表时间: 1999-04-22
期刊: CURRENT BIOLOGY
影响因子: 9.2
作者:
Brumell, JH;Steele-Mortimer, O;Finlay, BB
通讯作者: Finlay, BB
DOI: 10.1074/jbc.272.20.13134
发表时间: 1997-05-16
影响因子: 4.8
作者:
Harvey, NL;Butt, AJ;Kumar, S
通讯作者: Kumar, S
DOI: 10.1038/sj.cdd.4400251
发表时间: 1997-07-01
影响因子: 12.4
作者:
Kumar, S;Kinoshita, M;Noda, M
通讯作者: Noda, M
DOI: 10.1073/pnas.96.5.2396
发表时间: 1999-03-02
影响因子: 11.1
作者:
Hersh, D;Monack, DM;Zychlinsky, A
通讯作者: Zychlinsky, A