Abstract
Notch signaling has been demonstrated to have a central role in cancer stem-like cells (CSLCs) in glioblastoma multiforme (GBM). We have recently demonstrated the inhibitory effect of arsenic trioxide (ATO) on CSLCs in glioblastoma cell lines. In this study we used neurosphere recovery assay that measured neurosphere formation at three time points to assess the capacity of the culture to repopulate after ATO treatment. Our results provided strong evidence that ATO depleted CSLCs in GBM, and inhibited neurosphere recovery and secondary neurosphere formation. ATO inhibited the phosphorylation and activation of AKT and STAT3 through Notch signaling blockade. These data show that the ATO is a promising new approach to decrease glioblastoma proliferation and recurrence by downregulation of Notch pathway.
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