Abstract
Invasion into surrounding normal brain and resistance to genotoxic therapies are the main devastating aspects of glioblastoma (GBM). These biological features may be associated with the stem cell phenotype, which can be induced through a dedifferentiation process known as epithelial-mesenchymal transition (EMT). We show here that tumor cells around pseudopalisading necrotic areas in human GBM tissues highly express the most important EMT inducer, transforming growth factor (TGF-β), concurrently with the EMT-related transcriptional factor, TWIST. In addition, the stem cell markers CD133 and alkaline phosphatase (ALPL) were also highly expressed around necrotic foci in GBM tissues. The high expression of TGF-β around necrotic regions was significantly correlated with shorter progression-free survival and overall survival in patients with GBM. High expression of stem cell markers, ALPL, CD133, and CD44 was also correlated with poor outcomes. These results collectively support the hypothesis that tissue hypoxia induces the stem cell phenotype through TGF-β-related EMT and contributes to the poor outcome of GBM patients.
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Iwadate, Y., Matsutani, T., Hirono, S. et al. Transforming growth factor-β and stem cell markers are highly expressed around necrotic areas in glioblastoma. J Neurooncol 129, 101–107 (2016). https://doi.org/10.1007/s11060-016-2145-6
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DOI: https://doi.org/10.1007/s11060-016-2145-6