Mechanistic and biological significance of DNA methyltransferase 1 upregulated by growth factors in human hepatocellular carcinoma

Dysregulation of growth factor signaling plays a pivotal role in controlling the malignancy phenotype and progression of hepatocellular carcinoma (HCC). However, the precise oncogenic mechanisms underlying transcription regulation of certain tumor suppressor genes (TSGs) by growth factors are poorly...

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Veröffentlicht in:International journal of oncology 2015-02, Vol.46 (2), p.782-790
Hauptverfasser: FANG, QIN-LIANG, YIN, YI-RUI, XIE, CHENG-RONG, ZHANG, SHENG, ZHAO, WEN-XIU, PAN, CHAO, WANG, XIAO-MIN, YIN, ZHEN-YU
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container_title International journal of oncology
container_volume 46
creator FANG, QIN-LIANG
YIN, YI-RUI
XIE, CHENG-RONG
ZHANG, SHENG
ZHAO, WEN-XIU
PAN, CHAO
WANG, XIAO-MIN
YIN, ZHEN-YU
description Dysregulation of growth factor signaling plays a pivotal role in controlling the malignancy phenotype and progression of hepatocellular carcinoma (HCC). However, the precise oncogenic mechanisms underlying transcription regulation of certain tumor suppressor genes (TSGs) by growth factors are poorly understood. In the present study, we report a novel insulin-like growth factor 1 (IGF1) pathway that mediates de novo DNA methylation and TSG (such as DLC1 and CHD5) silencing by upregulation of the DNA methyltransferase 1 (DNMT1) via an AKT/β-transducin repeat-containing protein (βTrCP)-mediated ubiquitin-proteasome pathway in HCC. Analysis of DNA methylation in CpG islands of target genes revealed high co-localization of DNMT1 and DNMT3B on the promoters of TSGs associated with enhanced CpG hypermethylation. Our results point to a novel epigenetic mechanism for growth factor-mediated repression of TSG transcription that involves DNA methylation.
doi_str_mv 10.3892/ijo.2014.2776
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source Spandidos Publications Journals; MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Animals
Apoptosis
Cancer therapies
Carcinoma, Hepatocellular - drug therapy
Carcinoma, Hepatocellular - genetics
Carcinoma, Hepatocellular - pathology
Cell cycle
Cell growth
CpG Islands
Deoxyribonucleic acid
Development and progression
DNA
DNA (Cytosine-5-)-Methyltransferase 1
DNA (Cytosine-5-)-Methyltransferases - biosynthesis
DNA (Cytosine-5-)-Methyltransferases - genetics
DNA methylation
DNA Methylation - drug effects
DNA methyltransferase 1
DNA Methyltransferase 3B
Epigenesis, Genetic - drug effects
Epigenetics
Experiments
Gene Expression Regulation, Neoplastic - drug effects
Gene Targeting
Genes
Genetic aspects
Genomes
Growth factors
Hep G2 Cells
hepatocellular carcinoma
Hepatoma
Humans
Insulin-like growth factor 1
Intercellular Signaling Peptides and Proteins - administration & dosage
Kinases
Liver cancer
Liver Neoplasms - drug therapy
Liver Neoplasms - genetics
Liver Neoplasms - pathology
Lung cancer
Medical prognosis
Methyltransferases
Mice
Neoplasm Proteins - biosynthesis
Phosphorylation
Physiological aspects
Promoter Regions, Genetic
Proteins
Tumorigenesis
Xenograft Model Antitumor Assays
title Mechanistic and biological significance of DNA methyltransferase 1 upregulated by growth factors in human hepatocellular carcinoma
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