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2015 ; 43
(5
): 923-32
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Caspase-11 Requires the Pannexin-1 Channel and the Purinergic P2X7 Pore to
Mediate Pyroptosis and Endotoxic Shock
#MMPMID26572062
Yang D
; He Y
; Muñoz-Planillo R
; Liu Q
; Núñez G
Immunity
2015[Nov]; 43
(5
): 923-32
PMID26572062
show ga
The noncanonical inflammasome induced by intracellular lipopolysaccharide (LPS)
leads to caspase-11-dependent pyroptosis, which is critical for induction of
endotoxic shock in mice. However, the signaling pathway downstream of caspase-11
is unknown. We found that cytosolic LPS stimulation induced caspase-11-dependent
cleavage of the pannexin-1 channel followed up by ATP release, which in turn
activated the purinergic P2X7 receptor to mediate cytotoxicity. In the absence of
P2X7 or pannexin-1, pyroptosis induced by cytosolic LPS was abrogated. Cleavage
of pannexin-1 required the catalytic activity of caspase-11 and was essential for
ATP release and P2X7-mediated pyroptosis. Priming the caspase-11 pathway in vivo
with LPS or Toll-like receptor-3 (TLR3) agonist resulted in high mortality
in wild-type mice after secondary LPS challenge, but not in Casp11(-/-),
Panx1(-/-), or P2x7(-/-) mice. These results reveal a critical role for
pannexin-1 and P2X7 downstream of caspase-11 for pyroptosis and susceptibility to
sepsis induced by the noncanonical inflammasome.