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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
2014 ; 289
(28
): 19571-84
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Mitochondrial NLRP3 protein induces reactive oxygen species to promote Smad
protein signaling and fibrosis independent from the inflammasome
#MMPMID24841199
Bracey NA
; Gershkovich B
; Chun J
; Vilaysane A
; Meijndert HC
; Wright JR Jr
; Fedak PW
; Beck PL
; Muruve DA
; Duff HJ
J Biol Chem
2014[Jul]; 289
(28
): 19571-84
PMID24841199
show ga
Nucleotide-binding domain and leucine-rich repeat containing PYD-3 (NLRP3) is a
pattern recognition receptor that is implicated in the pathogenesis of
inflammation and chronic diseases. Although much is known regarding the NLRP3
inflammasome that regulates proinflammatory cytokine production in innate immune
cells, the role of NLRP3 in non-professional immune cells is unclear. Here we
report that NLRP3 is expressed in cardiac fibroblasts and increased during TGF?
stimulation. NLRP3-deficient cardiac fibroblasts displayed impaired
differentiation and R-Smad activation in response to TGF?. Only the central
nucleotide binding domain of NLRP3 was required to augment R-Smad signaling
because the N-terminal Pyrin or C-terminal leucine-rich repeat domains were
dispensable. Interestingly, NLRP3 regulation of myofibroblast differentiation
proceeded independently from the inflammasome, IL-1?/IL-18, or caspase 1.
Instead, mitochondrially localized NLRP3 potentiated reactive oxygen species to
augment R-Smad activation. In vivo, NLRP3-deficient mice were protected against
angiotensin II-induced cardiac fibrosis with preserved cardiac architecture and
reduced collagen 1. Together, these results support a distinct role for NLRP3 in
non-professional immune cells independent from the inflammasome to regulate
differential aspects of wound healing and chronic disease.