Clinical relevance of tumor cells with stem-like properties in pediatric brain tumors |
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Authors: | Thirant Cécile Bessette Barbara Varlet Pascale Puget Stéphanie Cadusseau Josette Tavares Silvina Dos Reis Studler Jeanne-Marie Silvestre David Carlos Susini Aurélie Villa Chiara Miquel Catherine Bogeas Alexandra Surena Anne-Laure Dias-Morais Amélia Léonard Nadine Pflumio Françoise Bièche Ivan Boussin François D Sainte-Rose Christian Grill Jacques Daumas-Duport Catherine Chneiweiss Hervé Junier Marie-Pierre |
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Institution: | Inserm, UMR894, Team Glial Plasticity, University Paris Descartes, Paris, France. |
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Abstract: | BackgroundPrimitive brain tumors are the leading cause of cancer-related death in children. Tumor cells with stem-like properties (TSCs), thought to account for tumorigenesis and therapeutic resistance, have been isolated from high-grade gliomas in adults. Whether TSCs are a common component of pediatric brain tumors and are of clinical relevance remains to be determined.Methodology/Principal FindingsTumor cells with self-renewal properties were isolated with cell biology techniques from a majority of 55 pediatric brain tumors samples, regardless of their histopathologies and grades of malignancy (57% of embryonal tumors, 57% of low-grade gliomas and neuro-glial tumors, 70% of ependymomas, 91% of high-grade gliomas). Most high-grade glioma-derived oncospheres (10/12) sustained long-term self-renewal akin to neural stem cells (>7 self-renewals), whereas cells with limited renewing abilities akin to neural progenitors dominated in all other tumors. Regardless of tumor entities, the young age group was associated with self-renewal properties akin to neural stem cells (P?=?0.05, chi-square test). Survival analysis of the cohort showed an association between isolation of cells with long-term self-renewal abilities and a higher patient mortality rate (P?=?0.013, log-rank test). Sampling of low- and high-grade glioma cultures showed that self-renewing cells forming oncospheres shared a molecular profile comprising embryonic and neural stem cell markers. Further characterization performed on subsets of high-grade gliomas and one low-grade glioma culture showed combination of this profile with mesenchymal markers, the radio-chemoresistance of the cells and the formation of aggressive tumors after intracerebral grafting.Conclusions/SignificanceIn brain tumors affecting adult patients, TSCs have been isolated only from high-grade gliomas. In contrast, our data show that tumor cells with stem cell-like or progenitor-like properties can be isolated from a wide range of histological sub-types and grades of pediatric brain tumors. They suggest that cellular mechanisms fueling tumor development differ between adult and pediatric brain tumors. |
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