The Notch pathway promotes the cancer stem cell characteristics of CD90+ cells in hepatocellular carcinoma
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Jing Luo1,2, Peng Wang1, Ronghua Wang1, Jinlin Wang1, Man Liu1, Si Xiong1, Yawen Li1, Bin Cheng1
1Department of Gastroenterology and Hepatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, P.R. China
2Department of Emergency, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, P.R. China
Bin Cheng, e-mail: firstname.lastname@example.org
Keywords: Notch pathway, HCC, CD90, cancer stem cells
Received: June 02, 2015 Accepted: December 07, 2015 Published: December 19, 2015
CD90 has been identified as a marker for liver cancer stem cells (CSCs) that are responsible for tumorigenic activity, but it is not known how CD90+ cells contribute to tumor initiation and progression. Our data demonstrated that high expression of CD90 in Hepatocellular Carcinoma (HCC) tissues correlated with venous filtration in HCC patients. CD90+ cells isolated from HCC cell lines exhibited increased tumorigenicity, chemoresistance, tumor invasion and metastasis. Notch pathway was activated in CD90+ cells and we found that inhibition of Notch pathway in CD90+ CSCs decreased tumorigenicity, cell invasion, migration and expression of stem cell related genes. Activation of Notch pathway in CD90- cells induced self-renewal, invasion and migration. Furthermore, we observed that cancer stem cell features were facilitated by stimulating G1-S transition in the cell cycle phase and inhibiting apoptosis mediated by Notch pathway. Our findings suggested CD90 could be used as a potential biomarker for HCC CSCs, and that cancer stem cell activity was elevated through up activated Notch pathway in CD90+ CSCs.
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