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Cancer stem cells are reportedly associated with drug resistance in glioma, but there are conflicting findings on the effects of cancer stem cells on drug resistance. The aim of the present study was to identify the underlying mechanisms of drug resistance in rat C6 glioma cells, through the use of Transwell invasion assays, flow cytometric and western blot analyses as well as immunohistochemical staining. The results revealed that acquisition of drug resistance by C6 cells enhanced migration ability in vivo and in vitro. Notably, drug resistance did not depend on the cancer stem cells of C6 cells, but on the increase of a side population phenotype. Blockade of the ABC transporter could increase sensitivity to temozolomide and temozolomide‑induced apoptosis in C6 cells. Collectively, these data indicated that drug resistance of C6 cells was mediated by the side population phenotype rather than by cancer stem cells.
Pubmed ID: 31578583
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