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Sci Rep. 2015 Jan 27;5:7979. doi: 10.1038/srep07979.

The evidence of glioblastoma heterogeneity.

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Department of Neurosurgery, Gifu University School of Medicine, Gifu City, Gifu, Japan.
Department of Tumor Pathology, Gifu University School of Medicine, Gifu City, Gifu, Japan.
Department of Tissue and Organ Regeneration, Gifu University School of Medicine, Gifu City, Gifu, Japan.
Department of Neurological Surgery, University of Virginia, Charlottesville, VA, USA.


Cancers are composed of heterogeneous combinations of cells that exhibit distinct phenotypic characteristics and proliferative potentials. Because most cancers have a clonal origin, cancer stem cells (CSCs) must generate phenotypically diverse progenies including mature CSCs that can self-renew indefinitely and differentiated cancer cells that possess limited proliferative potential. However, no convincing evidence exists to suggest that only single CSCs are representative of patients' tumors. To investigate the CSCs' diversity, we established 4 subclones from a glioblastoma patient. These subclones were subsequently propagated and analyzed. The morphology, the self-renewal and proliferative capacities of the subclones differed. Fluorescence-activated cell sorting and cDNA-microarray analyses revealed that each subclone was composed of distinct populations of cells. Moreover, the sensitivities of the subclones to an inhibitor of epidermal growth factor receptor were dissimilar. In a mouse model featuring xenografts of the subclones, the progression and invasion of tumors and animal survival were also different. Here, we present clear evidence that a brain tumor contains heterogeneous subclones that exhibit dissimilar morphologies and self-renewal and proliferative capacities. Our results suggest that single cell-derived subclones from a patient can produce phenotypically heterogeneous self-renewing progenies in both in vitro and in vivo settings.

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