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DEVELOPMENTAL BIOLOGY
Persistence of a small subpopulation of cancer stem-like cells in the C6 glioma cell line

¶
*Department of Cell Fate Modulation, Institute of Molecular Embryology and Genetics, Kumamoto University, 2-2-1 Honjo, Kumamoto 860-0811, Japan;
Centre for Brain Repair, University of Cambridge, E. D. Adrian Building, Forvie Site, Robinson Way, Cambridge CB2 2PY, United Kingdom; and ¶Department of Orthopaedic Surgery, Kagoshima Graduate School of Medicine and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan
Communicated by Martin C. Raff, University College London, London, United Kingdom, November 20, 2003 (received for review September 1, 2003)
Both stem cells and cancer cells are thought to be capable of unlimited proliferation. Paradoxically, however, some cancers seem to contain stem-like cells (cancer stem cells). To help resolve this paradox, we investigated whether established malignant cell lines, which have been maintained for years in culture, contain a subpopulation of stem cells. In this article, we show that many cancer cell lines contain a small side population (SP), which, in many normal tissues, is thought to contain the stem cells of the tissue. We demonstrate that in the absence of serum the combination of basic fibroblast growth factor and platelet-derived growth factor maintains SP cells in the C6 glioma cell line. Moreover, we show that C6 SP cells, but not non-SP cells, can generate both SP and non-SP cells in culture and are largely responsible for the in vivo malignancy of this cell line. Finally, we provide evidence that C6 SP cells can produce both neurons and glial cells in vitro and in vivo. We propose that many cancer cell lines contain a minor subpopulation of stem cells that is enriched in an SP, can be maintained indefinitely in culture, and is crucial for their malignancy.
T.K. and T.S. contributed equally to this work.
To whom correspondence should be sent at the
address. E-mail: tk294{at}cam.ac.uk.
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