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Tumors of the same histologic type often comprise clinically and molecularly distinct subgroups; however, the etiology of these subgroups is unknown. Here, we report that histologically identical, but genetically distinct, ependymomas exhibit patterns of gene expression that recapitulate those of radial glia cells in the corresponding region of the central nervous system. Cancer stem cells isolated from ependymomas displayed a radial glia phenotype and formed tumors when orthotopically transplanted in mice. These findings identify restricted populations of radial glia cells as candidate stem cells of the different subgroups of ependymoma, and they support a general hypothesis that subgroups of the same histologic tumor type are generated by different populations of progenitor cells in the tissues of origin.
Choroid plexus carcinomas (CPCs) are poorly understood and frequently lethal brain tumors with few treatment options. Using a mouse model of the disease and a large cohort of human CPCs, we performed a cross-species, genome-wide search for oncogenes within syntenic regions of chromosome gain. TAF12, NFYC, and RAD54L co-located on human chromosome 1p32-35.3 and mouse chromosome 4qD1-D3 were identified as oncogenes that are gained in tumors in both species and required for disease initiation and progression. TAF12 and NFYC are transcription factors that regulate the epigenome, whereas RAD54L plays a central role in DNA repair. Our data identify a group of concurrently gained oncogenes that cooperate in the formation of CPC and reveal potential avenues for therapy.
Cancers are believed to arise from cancer stem cells (CSCs), but it is not known if these cells remain dependent upon the niche microenvironments that regulate normal stem cells. We show that endothelial cells interact closely with self-renewing brain tumor cells and secrete factors that maintain these cells in a stem cell-like state. Increasing the number of endothelial cells or blood vessels in orthotopic brain tumor xenografts expanded the fraction of self-renewing cells and accelerated the initiation and growth of tumors. Conversely, depletion of blood vessels from xenografts ablated self-renewing cells from tumors and arrested tumor growth. We propose that brain CSCs are maintained within vascular niches that are important targets for therapeutic approaches.
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