International Journal of Medical Sciences

25 October 2014

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Int J Med Sci 2013; 10(4):399-407. doi:10.7150/ijms.5407

Research Paper

Hypoxia Enhances Stemness of Cancer Stem Cells in Glioblastoma: An In Vitro Study

Pengcheng Li1, Chun Zhou1, Lunshan Xu1✉, Hualiang Xiao2✉

1. Department of Neurosurgery, Research Institute of Field Surgery, Daping Hospital, Third Military Medical University, Chongqing, 400042, China.
2. Department of Pathology, Research Institute of Field Surgery, Daping Hospital, Third Military Medical University.

Abstract

Objective: To investigate the relationship between hypoxia and in vitro “stemness” of cancer stem cells (CSCs). Methods: U87 cells, U251 cells and primary glioma cells (n=3) experienced hypoxia. Transmission electron microscopy was done to detect the ultrastructure of these cancer cells; MTT assay to detect the cell growth; flow cytometry to detect cell cycle and CD133 expression; Transwell chamber assay was carried out to detect the cell migration; colony-forming assay to detect the colony-forming efficiency; real-time quantitative PCR and Western blot were carried out to detect the mRNA and protein expression of markers of stem cells and their differentiation, respectively. Results: Hypoxia maintained the undifferentiated state of primary glioma cells, slowed down the growth of glioma cells which were in a relatively quiescent stage, increased the colony forming efficiency and migration of glioma cells, and elevated the expression of markers of stem cells, but the expression of markers for stem cell differentiation was reduced after hypoxia treatment. Conclusion: Hypoxia may induce the "dedifferentiation" of differentiated glioma cells which then acquire the stemness.

Keywords: Cancer stem cell, Stemness, Hypoxia, Gioblastoma, Invasiveness.

How to cite this article:
Li P, Zhou C, Xu L, Xiao H. Hypoxia Enhances Stemness of Cancer Stem Cells in Glioblastoma: An In Vitro Study. Int J Med Sci 2013; 10(4):399-407. doi:10.7150/ijms.5407. Available from http://www.medsci.org/v10p0399.htm