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2016 ; 213
(6
): 877-85
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NLRP3 recruitment by NLRC4 during Salmonella infection
#MMPMID27139490
Qu Y
; Misaghi S
; Newton K
; Maltzman A
; Izrael-Tomasevic A
; Arnott D
; Dixit VM
J Exp Med
2016[May]; 213
(6
): 877-85
PMID27139490
show ga
NLRC4 and NLRP3, of the NOD-like receptor (NLR) family of intracellular proteins,
are expressed in innate immune cells and are thought to nucleate distinct
inflammasome complexes that promote caspase-1 activation, secretion of the
proinflammatory cytokines IL-1? and IL-18, and a form of cell death termed
pyroptosis. We show that NLRP3 associates with NLRC4 in macrophages infected with
Salmonella typhimurium or transfected with flagellin. The significance of the
interaction between the NLRC4 NACHT domain and NLRP3 was revealed when
Nlrc4(S533A/S533A) bone marrow-derived macrophages (BMDMs) expressing
phosphorylation site mutant NLRC4 S533A had only a mild defect in caspase-1
activation when compared with NLRC4-deficient BMDMs. NLRC4 S533A activated
caspase-1 by recruiting NLRP3 and its adaptor protein ASC. Thus,
Nlrc4(S533A/S533A) Nlrp3(-/-) BMDMs more closely resembled Nlrc4(-/-) BMDMs in
their response to S. typhimurium or flagellin. The interplay between NLRP3 and
NLRC4 reveals an unexpected overlap between what had been considered distinct
inflammasome scaffolds.