Glioblastoma multiforme (GBM) is the most common and lethal type of tumor of the central nervous system.. The glioblastoma stem-like cells (GSCs) represent the most undifferentiated and aggressive state of GBM malignant cells, being postulated to be responsible for reinitiating the tumorigenic process after the standard current therapy. In addition, the complex GBM intra-tumor heterogeneity highlights the contribution of different cell types such as neural stem cells and their derivatives in the genesis of this tumor. The RECK canonical protein suppresses cellular invasion, angiogenesis, and metastasis, but its mechanism of action is not yet fully understood. In order to contribute to better understanding of the complex RECK expression pattern, alternative spliced RECK transcripts were recently isolated and described by our group, who showed that the balance between the variants has an informative potential for GBM prognosis. Interestingly, the functional study of one of them, namely, RECK-B, suggests it has a pro-oncogenic activity. Furthermore, Reck depletion leads to precocious neuro-differentiation in mice brain during embryonic development, through the modulation of the Nocht pathway. Reck expression is higher in the dentate gyrus of adult murine brain, giving rise to the hypothesis about Reck's role in maintenance of NSCs in the undifferentiated state or their commitment to different differentiation pathways. Through meta-analysis, our preliminary data show that RECK expression, without distinction among its variants, is unexpectedly higher in CD133-positive tumor cells. In this context, we propose to evaluate the influence of canonical RECK and RECK-B in NSCs and its derivatives as well as in GSCs behavior and in the GBM tumorigenic process.
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