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2015 ; 18
(3
): 320-32
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Canonical Inflammasomes Drive IFN-? to Prime Caspase-11 in Defense against a
Cytosol-Invasive Bacterium
#MMPMID26320999
Aachoui Y
; Kajiwara Y
; Leaf IA
; Mao D
; Ting JP
; Coers J
; Aderem A
; Buxbaum JD
; Miao EA
Cell Host Microbe
2015[Sep]; 18
(3
): 320-32
PMID26320999
show ga
The inflammatory caspases 1 and 11 are activated in response to different
agonists and act independently to induce pyroptosis. In the context of
IL-1?/IL-18 secretion, however, in vitro studies indicate that caspase-11 acts
upstream of NLRP3 and caspase-1. By contrast, studying infection in vivo by the
cytosol-invasive bacterium Burkholderia thailandensis, we find that caspase-1
activity is required upstream of caspase-11 to control infection.
Caspase-1-activated IL-18 induces IFN-? to prime caspase-11 and rapidly clear B.
thailandensis infection. In the absence of IL-18, bacterial burdens persist,
eventually triggering other signals that induce IFN-?. Whereas IFN-? was
essential, endogenous type I interferons were insufficient to prime caspase-11.
Although mice transgenic for caspase-4, the human ortholog of caspase-11, cleared
B. thailandensis in vivo, they did not strictly require IFN-? priming. Thus,
caspase-1 provides priming signals upstream of caspase-11 but not caspase-4
during murine defense against a cytosol-invasive bacterium.