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2017 ; 8
(11
): 18191-18205
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gab.com Text
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English Wikipedia
Branched-chain amino acids prevent hepatic fibrosis and development of
hepatocellular carcinoma in a non-alcoholic steatohepatitis mouse model
#MMPMID28212548
Takegoshi K
; Honda M
; Okada H
; Takabatake R
; Matsuzawa-Nagata N
; Campbell JS
; Nishikawa M
; Shimakami T
; Shirasaki T
; Sakai Y
; Yamashita T
; Takamura T
; Tanaka T
; Kaneko S
Oncotarget
2017[Mar]; 8
(11
): 18191-18205
PMID28212548
show ga
Oral supplementation with branched-chain amino acids (BCAA; leucine, isoleucine,
and valine) in patients with liver cirrhosis potentially suppresses the incidence
of hepatocellular carcinoma (HCC) and improves event-free survival. However, the
detailed mechanisms of BCAA action have not been fully elucidated. BCAA were
administered to atherogenic and high-fat (Ath+HF) diet-induced nonalcoholic
steatohepatitis (NASH) model mice. Liver histology, tumor incidence, and gene
expression profiles were evaluated. Ath+HF diet mice developed hepatic tumors at
a high frequency at 68 weeks. BCAA supplementation significantly improved hepatic
steatosis, inflammation, fibrosis, and tumors in Ath+HF mice at 68 weeks.
GeneChip analysis demonstrated the significant resolution of pro-fibrotic gene
expression by BCAA supplementation. The anti-fibrotic effect of BCAA was
confirmed further using platelet-derived growth factor C transgenic mice, which
develop hepatic fibrosis and tumors. In vitro, BCAA restored the transforming
growth factor (TGF)-?1-stimulated expression of pro-fibrotic genes in hepatic
stellate cells (HSC). In hepatocytes, BCAA restored TGF-?1-induced apoptosis,
lipogenesis, and Wnt/?-Catenin signaling, and inhibited the transformation of
WB-F344 rat liver epithelial stem-like cells. BCAA repressed the promoter
activity of TGF?1R1 by inhibiting the expression of the transcription factor NFY
and histone acetyltransferase p300. Interestingly, the inhibitory effect of BCAA
on TGF-?1 signaling was mTORC1 activity-dependent, suggesting the presence of
negative feedback regulation from mTORC1 to TGF-?1 signaling. Thus, BCAA induce
an anti-fibrotic effect in HSC, prevent apoptosis in hepatocytes, and decrease
the incidence of HCC; therefore, BCAA supplementation would be beneficial for
patients with advanced liver fibrosis with a high risk of HCC.
|Amino Acids, Branched-Chain/*pharmacology
[MESH]
|Animals
[MESH]
|Carcinoma, Hepatocellular/pathology/*prevention & control
[MESH]
|Disease Models, Animal
[MESH]
|Genetic Diseases, Inborn/pathology/*prevention & control
[MESH]
|Humans
[MESH]
|Liver Cirrhosis/pathology/*prevention & control
[MESH]
|Liver Neoplasms/*etiology/pathology
[MESH]
|Male
[MESH]
|Mice
[MESH]
|Mice, Inbred C57BL
[MESH]
|Non-alcoholic Fatty Liver Disease/pathology/*prevention & control
[MESH]