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2017 ; 171
(5
): 1110-1124.e18
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The DNA Inflammasome in Human Myeloid Cells Is Initiated by a STING-Cell Death
Program Upstream of NLRP3
#MMPMID29033128
Gaidt MM
; Ebert TS
; Chauhan D
; Ramshorn K
; Pinci F
; Zuber S
; O'Duill F
; Schmid-Burgk JL
; Hoss F
; Buhmann R
; Wittmann G
; Latz E
; Subklewe M
; Hornung V
Cell
2017[Nov]; 171
(5
): 1110-1124.e18
PMID29033128
show ga
Detection of cytosolic DNA constitutes a central event in the context of numerous
infectious and sterile inflammatory conditions. Recent studies have uncovered a
bipartite mode of cytosolic DNA recognition, in which the cGAS-STING axis
triggers antiviral immunity, whereas AIM2 triggers inflammasome activation. Here,
we show that AIM2 is dispensable for DNA-mediated inflammasome activation in
human myeloid cells. Instead, detection of cytosolic DNA by the cGAS-STING axis
induces a cell death program initiating potassium efflux upstream of NLRP3.
Forward genetics identified regulators of lysosomal trafficking to modulate this
cell death program, and subsequent studies revealed that activated STING traffics
to the lysosome, where it triggers membrane permeabilization and thus lysosomal
cell death (LCD). Importantly, the cGAS-STING-NLRP3 pathway constitutes the
default inflammasome response during viral and bacterial infections in human
myeloid cells. We conclude that targeting the cGAS-STING-LCD-NLRP3 pathway will
ameliorate pathology in inflammatory conditions that are associated with
cytosolic DNA sensing.