Oncotarget

Research Papers:

Y-box binding protein-1 promotes hepatocellular carcinoma-initiating cell progression and tumorigenesis via Wnt/β-catenin pathway

Hsiao-Mei Chao, Hong-Xuan Huang, Po-Hsiang Chang, Kuo-Chang Tseng, Atsushi Miyajima and Edward Chern _

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Oncotarget. 2017; 8:2604-2616. https://doi.org/10.18632/oncotarget.13733

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Abstract

Hsiao-Mei Chao1,2, Hong-Xuan Huang1, Po-Hsiang Chang1, Kuo-Chang Tseng1, Atsushi Miyajima3, Edward Chern1

1niChe Laboratory for Stem Cell and Regenerative Medicine, Department of Biochemical Science and Technology, National Taiwan University, Taipei, Taiwan

2Department of Pathology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan

3Institute of Molecular and Cellular Biosciences, The University of Tokyo, Tokyo, Japan

Correspondence to:

Edward Chern, email: [email protected]

Keywords: Y-box binding protein 1, tumor-initiating cell, HCC, Wnt, stemness

Received: June 13, 2016     Accepted: November 22, 2016     Published: December 01, 2016

ABSTRACT

Y-box binding protein-1 (YB-1) is a pleiotropic molecule that binds DNA to regulate genes on a transcriptional level in the nucleus and binds RNA to modulate gene translation in the cytoplasm. In our previous studies, YB-1 was also characterized as a fetal hepatic protein that regulates the maturation of hepatocytes and is upregulated during liver regeneration. Moreover, YB-1 has been shown to be expressed in human hepatocellular carcinoma (HCC). However, the role of YB-1 in HCC remains unclear. Here, we aimed to characterize the role of YB-1 in HCC. Based on the results of loss-of-function in HCC and gain-of-function in mice liver using hydrodynamic gene delivery, YB-1 promoted hepatic cells proliferation in vitro and in vivo. YB-1 was also involved in HCC cell proliferation, migration, and drug-resistance. The results of extreme limiting dilution sphere forming analysis and cancer initiating cell marker analysis were also shown that YB-1 maintained HCC initiating cells population. YB-1 also induced the epithelial-mesenchymal transition and stemness-related gene expression. Knockdown of YB-1 suppressed the expression of Wnt ligands and β-catenin, impaired Wnt/β-catenin signaling pathway and reduced the numbers of HCC initiating cells. Moreover, YB-1 displayed nuclear localization particularly in the HCC initiating cells, the EpCAM+ cells or sphere cells. Our findings suggested that YB-1 was a key factor in HCC tumorigenesis and maintained the HCC initiating cell population.


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