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2016 ; 13
(5
): 3835-41
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Inhibition of the translocation and extracellular release of high-mobility group
box 1 alleviates liver damage in fibrotic mice in response to
D-galactosamine/lipopolysaccharide challenge
#MMPMID27035642
Bai L
; Kong M
; Zheng Q
; Zhang X
; Liu X
; Zu K
; Chen Y
; Zheng S
; Li J
; Ren F
; Lou J
; Liu S
; Duan Z
Mol Med Rep
2016[May]; 13
(5
): 3835-41
PMID27035642
show ga
Acute liver injury in the setting of fibrosis is an area of interest in
investigations, and remains to be fully elucidated. Previous studies have
suggested the beneficial effects of liver fibrosis induced by thioacetamide and
partial bile duct ligation against Fas?mediated acute liver injury. The
activation of AKT and extracellular signal-regulated kinase signaling is
considered to be crucial in this hepatoprotection. To demonstrate the protection
of CCl4?induced liver fibrosis against lethal challenge, the present study
compared the reactivity to lethal doses of D?galactosamine
(D-GalN)/lipopolysaccharide (LPS) between fibrotic mice and control mice groups.
The extent of hepatic damage was assessed by survival rate and histopathological
analysis. The molecular basis of the fibrosis?based hepatoprotection was
examined, with a particular focus on the translocation and release of
high?mobility group box (HMGB)1 and the inflammatory response triggered by HMGB1.
Hepatoprotection induced by fibrosis was demonstrated by improved survival rates
(100%, vs. 20%) and improved preservation of liver architecture in fibrotic mice
subjected to D?GalN/LPS, compared with control mice treated in the same way.
D?GalN/LPS evoked the translocation and release of HMGB1, detected by
immunohistochemistry, in the control mice, which was significantly inhibited in
the fibrotic mice. The gene expression levels of HMGB1?associated proinflammatory
cytokines, including interleukin (IL)?1?, IL?6, tumor necrosis factor?? and
IL?12p40, were markedly inhibited in the fibrotic mice when exposed to
D?GalN/LPS. These findings confirmed that CCl4?based fibrosis induced
hepatoprotection, and provided evidence that fibrosis inhibited the translocation
and release of HMGB1, and the proinflammatory response triggered by HMGB1. This
alleviated liver damage following exposure to D?GalN/LPS challenge.