Journal
CANCER LETTERS
Volume 322, Issue 1, Pages 70-77Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2012.02.010
Keywords
Cancer stem-like cell; Bladder cancer; Cisplatin resistance; Epithelial-mesenchymal transition
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Funding
- National Nature Science Foundation of China (NSFC) [30973385]
- National Basic Research Program of China (973 Program) [2010CB529402]
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A variety of cancer stem-like cells (CSCs) have been shown to be responsible for cancer tumorigenicity, relapse and metastasis. Despite several reports demonstrating the presence of CSCs in human bladder cancer, their identities are still under debate, and few studies have examined their roles in cisplatin resistance and related tumor progression. In this study, a subpopulation of CSCs was enriched following cisplatin selection from the bladder cell line T24. The cisplatin-resistant T24 cells displayed a greater self-renewal capacity as demonstrated by higher levels of sphere formation and stem cell marker expression, contained a larger proportion of side population cells and exhibited higher tumorigenicity. They also possessed epithelial-mesenchymal transition characteristics. Furthermore, a strong correlation between the levels of Bmi1 and Nanog expression and the degree of malignancy of urothelial cell carcinomas tissues was observed. We provide the first direct evidence that CSC-like cells exist in the population of cisplatin-resistant bladder cancer cells and may play a role in the progression and drug resistance of bladder cancer. (C) 2012 Elsevier Ireland Ltd. All rights reserved.
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