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2015 ; 6
(5
): e1751
Nephropedia Template TP
gab.com Text
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English Wikipedia
Gankyrin drives malignant transformation of chronic liver damage-mediated
fibrosis via the Rac1/JNK pathway
#MMPMID25950481
Zhao X
; Fu J
; Xu A
; Yu L
; Zhu J
; Dai R
; Su B
; Luo T
; Li N
; Qin W
; Wang B
; Jiang J
; Li S
; Chen Y
; Wang H
Cell Death Dis
2015[May]; 6
(5
): e1751
PMID25950481
show ga
Hepatocarcinogenesis is a complex process involving chronic liver injury,
inflammation, unregulated wound healing, subsequent fibrosis and carcinogenesis.
To decipher the molecular mechanism underlying transition from chronic liver
injury to dysplasia, we investigated the oncogenic role of gankyrin (PSMD10 or
p28GANK) during malignant transformation in a transgenic mouse model. Here, we
find that gankyrin increased in patients with cirrhosis. In addition to more
severe liver fibrosis and tumorigenesis after DEN plus CCl4 treatment,
hepatocyte-specific gankyrin-overexpressing mice (gankyrinhep) exhibited
malignant transformation from liver fibrosis to tumors even under single CCl4
administration, whereas wild-type mice merely experienced fibrosis. Consistently,
enhanced hepatic injury, severe inflammation and strengthened compensatory
proliferation occurred in gankyrinhep) mice during CCl4 performance. This
correlated with augmented expressions of cell cycle-related genes and abnormal
activation of Rac1/c-jun N-terminal kinase (JNK). Pharmacological inhibition of
the Rac1/JNK pathway attenuated hepatic fibrosis and prevented CCl4-induced
carcinogenesis in gankyrinhep mice. Together, these findings suggest that
gankyrin promotes liver fibrosis/cirrhosis progression into hepatocarcinoma
relying on a persistent liver injury and inflammatory microenvironment. Blockade
of Rac1/JNK activation impeded gankyrin-mediated hepatocytic malignant
transformation, indicating the combined inhibition of gankyrin and Rac1/JNK as a
potential prevention mechanism for cirrhosis transition.