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.
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DOI:
10.1084/jem.192.7.1035
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发表时间:
2000-10-02
期刊:
影响因子:
--
通讯作者:
Baccarini M
中科院分区:
文献类型:
--
作者:
Jesenberger V;Procyk KJ;Yuan J;Reipert S;Baccarini M
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.
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DOI:
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发表时间:
1999-03-02
影响因子:
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通讯作者:
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