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CHD1L promotes lineage reversion of hepatocellular carcinoma through opening chromatin for key developmental transcription factors
Author(s) -
Liu Ming,
Chen Leilei,
Ma NingFang,
Chow Raymond Kwok Kei,
Li Yan,
Song Yangyang,
Chan Tim Hon Man,
Fang Shuo,
Yang Xiaodong,
Xi Shaoyan,
Jiang Lingxi,
Li Yun,
Zeng TingTing,
Li Yan,
Yuan YunFei,
Guan XinYuan
Publication year - 2016
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.28437
Subject(s) - chromatin , biology , hccs , chromatin immunoprecipitation , cancer research , transcription factor , cellular differentiation , microbiology and biotechnology , genetics , hepatocellular carcinoma , promoter , gene expression , gene
High‐grade tumors with poor differentiation usually show phenotypic resemblance to their developmental ancestral cells. Cancer cells that gain lineage precursor cell properties usually hijack developmental signaling pathways to promote tumor malignant progression. However, the molecular mechanisms underlying this process remain unclear. In this study, the chromatin remodeler chromodomain‐helicase‐DNA‐binding‐protein 1‐like (CHD1L) was found closely associated with liver development and hepatocellular carcinoma (HCC) tumor differentiation. Expression of CHD1L decreased during hepatocyte maturation and increased progressively from well‐differentiated HCCs to poorly differentiated HCCs. Chromatin immunoprecipitation followed by high‐throughput deep sequencing found that CHD1L could bind to the genomic sequences of genes related to development. Bioinformatics‐aided network analysis indicated that CHD1L‐binding targets might form networks associated with developmental transcription factor activation and histone modification. Overexpression of CHD1L conferred ancestral precursor‐like properties of HCC cells both in vitro and in vivo . Inhibition of CHD1L reversed tumor differentiation and sensitized HCC cells to sorafenib treatment. Mechanism studies revealed that overexpression of CHD1L could maintain an active “open chromatin” configuration at promoter regions of estrogen‐related receptor‐beta and transcription factor 4, both of which are important regulators of HCC self‐renewal and differentiation. In addition, we found a significant correlation of CHD1L with developmental transcriptional factors and lineage differentiation markers in clinical HCC patients. Conclusion: Genomic amplification of chromatin remodeler CHD1L might drive dedifferentiation of HCC toward an ancestral lineage through opening chromatin for key developmental transcriptional factors; further inhibition of CHD1L might “downgrade” poorly differentiated HCCs and provide novel therapeutic strategies. (H epatology 2016;63:1544‐1559)