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2015 ; 2015
(ä): 909827
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Constitutive Activation of the Nlrc4 Inflammasome Prevents Hepatic Fibrosis and
Promotes Hepatic Regeneration after Partial Hepatectomy
#MMPMID26635450
DeSantis DA
; Ko CW
; Wang L
; Lee P
; Croniger CM
Mediators Inflamm
2015[]; 2015
(ä): 909827
PMID26635450
show ga
TThe molecular mechanisms responsible for the development of hepatic fibrosis are
not fully understood. The Nlrc4 inflammasome detects cytosolic presence of
bacterial components, activating inflammatory cytokines to facilitate clearance
of pathogens and infected cells. We hypothesized that low-grade constitutive
activation of the Nlrc4 inflammasome may lead to induced hepatocyte proliferation
and prevent the development of hepatic fibrosis. The gene of Nlrc4 contains two
single nucleotide polymorphisms (SNPs), one located within the Nlrc4 promoter and
one contained within exon 5. These SNPs regulate Nlrc4 gene transcription and
activation as measured through gene reporter assays and IL-1? secretion. The
17C-6 mice have increased IL-1? in plasma after chronic carbon tetrachloride
(CCl4) administration compared to B6 mice. After two-thirds partial hepatectomy
(2/3PH) 17C-6 mice have earlier restoration of liver mass with greater cyclin D1
protein and BrdU incorporation compared to B6 mice at several time points. These
data reveal mild constitutive activation of the Nlrc4 inflammasome as the results
of two SNPs, which leads to the stimulation of hepatocyte proliferation. The
increased liver regeneration induces rapid liver mass recovery after hepatectomy
and may prevent the development of hepatotoxin-induced liver fibrosis.