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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2017 ; 292
(29
): 12077-12087
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The intracellular chloride channel proteins CLIC1 and CLIC4 induce IL-1?
transcription and activate the NLRP3 inflammasome
#MMPMID28576828
Domingo-Fernández R
; Coll RC
; Kearney J
; Breit S
; O'Neill LAJ
J Biol Chem
2017[Jul]; 292
(29
): 12077-12087
PMID28576828
show ga
The NLRP3 inflammasome is a multiprotein complex that regulates the activation of
caspase-1 leading to the maturation of the proinflammatory cytokines IL-1? and
IL-18 and promoting pyroptosis. Classically, the NLRP3 inflammasome in murine
macrophages is activated by the recognition of pathogen-associated molecular
patterns and by many structurally unrelated factors. Understanding the precise
mechanism of NLRP3 activation by such a wide array of stimuli remains elusive,
but several signaling events, including cytosolic efflux and influx of select
ions, have been suggested. Accordingly, several studies have indicated a role of
anion channels in NLRP3 inflammasome assembly, but their direct involvement has
not been shown. Here, we report that the chloride intracellular channel proteins
CLIC1 and CLIC4 participate in the regulation of the NLRP3 inflammasome. Confocal
microscopy and cell fractionation experiments revealed that upon LPS stimulation
of macrophages, CLIC1 and CLIC4 translocated into the nucleus and cellular
membrane. In LPS/ATP-stimulated bone marrow-derived macrophages (BMDMs), CLIC1 or
CLIC4 siRNA transfection impaired transcription of IL-1?, ASC speck formation,
and secretion of mature IL-1?. Collectively, our results demonstrate that CLIC1
and CLIC4 participate both in the priming signal for IL-1? and in NLRP3
activation.