A modified method by differential adhesion for enrichment of bladder cancer stem cells

Vol. 42 (4): 817-824, July – August, 2016

doi: 10.1590/S1677-5538.IBJU.2015.0409


ORIGINAL ARTICLE

Yong-tong Zhu 1,2, Shi-yu Pang 2, Yang Luo 2, Wei Chen 2, Ji-ming Bao 2, Wan-long Tan 2

1 Department of Obstetrics and Gynecology, Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China; 2 Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, China

ABSTRACT

Purpose: In a previous study the vaccine was effective against bladder cancer in a mouse model. However, a small portion of tumors regrew because the vaccine could not eliminate bladder cancer stem cells (CSCs). In this study, we showed a modified method for the isolation of bladder CSCs using a combination of differential adhesion method and serum-free culture medium (SFM) method.
Materials and Methods: Trypsin-resistant cells and trypsin-sensitive cells were isolated from MB49, EJ and 5637 cells by a combination of differential adhesion method and SFM method. The CSCs characterizations of trypsin-resistant cells were verified by the flow cytometry, the western blotting, the quantitative polymerase chain reaction, the resistance to chemotherapy assay, the transwell assay, and the tumor xenograft formation assay.
Results: Trypsin-resistant cells were isolated and identified in CSCs characters, with high expression of CSCs markers, higher resistance to chemotherapy, greater migration in vitro, and stronger tumorigenicity in vivo.
Conclusion: Trypsin-resistant cells displayed specific CSCs properties. Our study showed trypsin-resistant cells were isolated successfully with a modified method using a combination of differential adhesion method and SFM method.

Keywords: Urinary Bladder Neoplasms; Neoplastic Stem Cells; Trypsin

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