A preliminary study of the role of extracellular -5′- nucleotidase in breast cancer stem cells and epithelial-mesenchymal transition
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- 作者：Jiangang Yu ; Xiaohong Liao ; Luying Li…
- 关键词：Breast cancer ; CD73 ; Tumor stem cell ; Epithelial ; mesenchymal transition
- 刊名：In Vitro Cellular & Developmental Biology - Animal
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：53
- 期：2
- 页码：132-140
- 全文大小：
- 刊物主题：Cell Biology; Developmental Biology; Stem Cells; Cell Culture; Animal Genetics and Genomics;
- 出版者：Springer US
- ISSN：1543-706X
- 卷排序：53
文摘
Tumor stem cell theory may well explain a variety of malignant behaviors of tumors. Cells undergoing epithelial-mesenchymal transition (EMT) share many characteristics with tumor stem cells. Our previous studies showed that extracellular -5'- nucleotidase (CD73), one of the important surface markers of mesenchymal stem cells, may promote growth and metastasis of breast cancer cells both in vivo and in vitro. In this study, we assessed breast cancer stem cell (BCSC) markers [acetaldehyde dehydrogenase (ALDH)+ and CD44+CD24−] in various breast cancer cell lines with flow cytometry after overexpression (by lentivirus infection) or suppression (by siRNA interference) of CD73. We measured CD73 expression in breast cancer mammospheres with real-time PCR and western blots. Finally, we examined the expression of CD73 and EMT markers in different breast cancer cell lines, as well as in mammary cells (MCF10A) that underwent EMT induced by transforming growth factor beta (TGF-β). We found that CD73 positively correlated with ALDH+ or CD44+CD24− subsets of breast cancer cells. CD73 was expressed more in breast cancer mammospheres than in adherent cells. CD73 and mesenchymal marker expression was higher in breast cancer cells with more malignant features, while CD73 was lower in low malignant breast cancer cells with higher epithelial markers. Furthermore, CD73 expression increased during the process of TGF-β-induced EMT. Our results indicate that CD73 may play an important role in BCSCs.