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Histone Deacetylase HDAC8 Promotes Insulin Resistance and β-Catenin Activation in NAFLD-Associated Hepatocellular Carcinoma.
- Source :
-
Cancer research [Cancer Res] 2015 Nov 15; Vol. 75 (22), pp. 4803-16. Date of Electronic Publication: 2015 Sep 17. - Publication Year :
- 2015
-
Abstract
- The growing epidemic of obesity, which causes nonalcoholic fatty liver disease (NAFLD) and the more severe phenotype nonalcoholic steatohepatitis (NASH), has paralleled the increasing incidence of hepatocellular carcinoma (HCC). Accumulating evidence demonstrates that overnutrition and metabolic pathways can trigger modifications of DNA and histones via deregulation of chromatin modifiers, resulting in aberrant transcriptional activity. However, the epigenetic regulation of HCC development in NAFLD remains obscure. Here, we uncover key epigenetic regulators using both dietary and genetic obesity-promoted HCC models through quantitative expression profiling and characterize the oncogenic activities of histone deacetylase HDAC8 in NAFLD-associated hepatocarcinogenesis. HDAC8 is directly upregulated by the lipogenic transcription factor SREBP-1 where they are coexpressed in dietary obesity models of NASH and HCC. Lentiviral-mediated HDAC8 attenuation in vivo reversed insulin resistance and reduced NAFLD-associated tumorigenicity. HDAC8 modulation by genetic and pharmacologic approaches inhibited p53/p21-mediated apoptosis and G2-M phase cell-cycle arrest and stimulated β-catenin-dependent cell proliferation. Mechanistically, HDAC8 physically interacted with the chromatin modifier EZH2 to concordantly repress Wnt antagonists via histone H4 deacetylation and H3 lysine 27 trimethylation. In human NAFLD-associated HCC, levels of SREBP-1, HDAC8, EZH2, H4 deacetylation, H3K27me3, and active β-catenin were all correlated positively in tumors compared with nontumor tissues. Overall, our findings show how HDAC8 drives NAFLD-associated hepatocarcinogenesis, offering a novel epigenetic target to prevent or treat HCC in obese patients.<br /> (©2015 American Association for Cancer Research.)
- Subjects :
- Animals
Blotting, Western
Carcinogenesis metabolism
Carcinoma, Hepatocellular etiology
Cell Line
Chromatin Immunoprecipitation
Disease Models, Animal
Flow Cytometry
Humans
Immunohistochemistry
Insulin Resistance physiology
Liver Neoplasms etiology
Mice
Mice, Inbred C57BL
Reverse Transcriptase Polymerase Chain Reaction
Transcriptome
Up-Regulation
beta Catenin metabolism
Carcinoma, Hepatocellular enzymology
Histone Deacetylases biosynthesis
Liver Neoplasms enzymology
Non-alcoholic Fatty Liver Disease complications
Obesity complications
Repressor Proteins biosynthesis
Subjects
Details
- Language :
- English
- ISSN :
- 1538-7445
- Volume :
- 75
- Issue :
- 22
- Database :
- MEDLINE
- Journal :
- Cancer research
- Publication Type :
- Academic Journal
- Accession number :
- 26383163
- Full Text :
- https://doi.org/10.1158/0008-5472.CAN-14-3786