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Inhibition of Notch signaling alters the phenotype of orthotopic tumors formed from glioblastoma multiforme neurosphere cells but does not hamper intracranial tumor growth regardless of endogene Notch pathway signature

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  1. Level of Notch activation determines the effect on growth and stem cell-like features in glioblastoma multiforme neurosphere cultures

    Research output: Contribution to journalJournal articleResearchpeer-review

  2. Small molecule kinase inhibitors block the ZAK-dependent inflammatory effects of doxorubicin

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  3. Biomarkers in tissue from patients with upper gastrointestinal cancers treated with erlotinib and bevacizumab

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  1. Proteomics-Based Comparative Mapping of the Secretomes of Human Brown and White Adipocytes Reveals EPDR1 as a Novel Batokine

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  2. Near-infrared fluorescence imaging improves the nodal yield in neck dissection in oral cavity cancer - A randomized study

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  3. Cell-free DNA in newly diagnosed patients with glioblastoma - a clinical prospective feasibility study

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BACKGROUND: Brain cancer stem-like cells (bCSC) are cancer cells with neural stem cell (NSC)-like properties found in the devastating brain tumor glioblastoma multiforme (GBM). bCSC are proposed a central role in tumor initiation, progression, treatment resistance and relapse and as such present a promising target in GBM research. The Notch signaling pathway is often deregulated in GBM and we have previously characterized GBM-derived bCSC cultures based on their expression of the Notch-1 receptor and found that it could be used as predictive marker for the effect of Notch inhibition. The aim of the present project was therefore to further elucidate the significance of Notch pathway activity for the tumorigenic properties of GBM-derived bCSC.

METHODS: Human-derived GBM xenograft cells previously established as NSC-like neurosphere cultures were used. Notch inhibition was accomplished by exposing the cells to the gamma-secretase inhibitor DAPT prior to gene expression analysis and intracranial injection into immunocompromised mice.

RESULTS: By analyzing the expression of several Notch pathway components, we found that the cultures indeed displayed different Notch pathway signatures. However, when DAPT-treated neurosphere cells were injected into the brain of immunocompromised mice, no increase in survival was obtained regardless of Notch pathway signature and Notch inhibition. We did however observe a decrease in the expression of the stem cell marker Nestin, an increase in the proliferative marker Ki-67 and an increased number of abnormal vessels in tumors formed from DAPT-treated, high Notch-1 expressing cultures, when compared with the control.

CONCLUSION: Based on the presented results we propose that Notch inhibition partly induces differentiation of bCSC, and selects for a cell type that more strongly induces angiogenesis if the treatment is not sustained. However, this more differentiated cell type might prove to be more sensitive to conventional therapies.

Original languageEnglish
JournalCancer Biology & Therapy
Volume15
Issue number7
Pages (from-to)862-77
Number of pages16
ISSN1538-4047
DOIs
Publication statusPublished - Jul 2014

ID: 44846905