SUV39H1 Maintains Cancer Stem Cells in Glioblastoma [RNA-seq]
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PROVIDER: PRJNA1139792 | ENA |
REPOSITORIES: ENA
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Project description:SUV39H1 Maintains Cancer Stem Cells in Glioblastoma [ATAC-seq]
| PRJNA1139791 | ENA
Project description:Glioblastoma (GBM) is the deadliest brain cancer, driven in part by GBM stem cells (GSCs) that contribute to therapeutic resistance and tumor recurrence. Effective targeting and elimination of GSCs hold promise for preventing GBM recurrence and achieving potential cures. In this study, we explored the role of the epigenetic regulator SUV39H1 in GSC maintenance and GBM progression. We observed that SUV39H1 is upregulated in GBM samples compared to normal brain tissues. Single-cell RNA-seq data indicated that SUV39H1 is preferentially expressed in GSCs relative to non-stem GBM cells, possibly due to super-enhancer-mediated transcriptional activation. Knockdown of SUV39H1 in patient-derived GSCs impaired their proliferation and stemness. RNA-seq analysis revealed that SUV39H1 regulates G2/M cell cycle progression, stem cell maintenance, and cell death pathways in GSCs. Integrated ATAC-seq (assay for transposase-accessible chromatin followed by sequencing) and RNA-seq analyses demonstrated that targeting SUV39H1 altered chromatin accessibility in key genes associated with these pathways. Treatment with chaetocin, a SUV39H1 inhibitor, mimicked the effects of SUV39H1 knockdown in GSCs and sensitized them to the GBM chemotherapy drug temozolomide (TMZ). In vivo studies using an intracranial patient-derived xenograft model showed that targeting SUV39H1 inhibited GSC-driven tumor formation in mice. Our findings identify SUV39H1 as a critical regulator of GSC maintenance and suggest that targeting SUV39H1 could disrupt GSCs and enhance the efficacy of existing chemotherapy, offering a promising strategy for improving GBM treatment outcomes.
2024-11-06 | GSE273012 | GEO
Project description:Glioblastoma (GBM) is the deadliest brain cancer, driven in part by GBM stem cells (GSCs) that contribute to therapeutic resistance and tumor recurrence. Effective targeting and elimination of GSCs hold promise for preventing GBM recurrence and achieving potential cures. In this study, we explored the role of the epigenetic regulator SUV39H1 in GSC maintenance and GBM progression. We observed that SUV39H1 is upregulated in GBM samples compared to normal brain tissues. Single-cell RNA-seq data indicated that SUV39H1 is preferentially expressed in GSCs relative to non-stem GBM cells, possibly due to super-enhancer-mediated transcriptional activation. Knockdown of SUV39H1 in patient-derived GSCs impaired their proliferation and stemness. RNA-seq analysis revealed that SUV39H1 regulates G2/M cell cycle progression, stem cell maintenance, and cell death pathways in GSCs. Integrated ATAC-seq (assay for transposase-accessible chromatin followed by sequencing) and RNA-seq analyses demonstrated that targeting SUV39H1 altered chromatin accessibility in key genes associated with these pathways. Treatment with chaetocin, a SUV39H1 inhibitor, mimicked the effects of SUV39H1 knockdown in GSCs and sensitized them to the GBM chemotherapy drug temozolomide (TMZ). In vivo studies using an intracranial patient-derived xenograft model showed that targeting SUV39H1 inhibited GSC-driven tumor formation in mice. Our findings identify SUV39H1 as a critical regulator of GSC maintenance and suggest that targeting SUV39H1 could disrupt GSCs and enhance the efficacy of existing chemotherapy, offering a promising strategy for improving GBM treatment outcomes.
2024-11-06 | GSE273013 | GEO
Project description:Glioblastoma is one of the most malignant brain tumors with poor prognosis and their development and progression are known to be driven by glioblastoma stem cells. Although glioblastoma stem cells lose their cancer stemness properties during cultivation in serum-containing medium, little is known about the molecular mechanisms regulating signaling alteration in relation to reduction of stemness. In order to elucidate the global phosphorylation-related signaling events, we performed a SILAC-based quantitative phosphoproteome analysis of serum-induced dynamics in glioblastoma stem cells established from the tumor tissues of the patient. Among a total of 2,876 phosphorylation sites on 1,584 proteins identified in our analysis, 732 phosphorylation sites on 419 proteins were regulated through the alteration of stem cell characteristics.
2016-01-13 | PXD002614 | Pride
Project description:The paper describes a model of glioblastoma.
Created by COPASI 4.25 (Build 207)
This model is described in the article:
Modeling the Treatment of Glioblastoma Multiforme and Cancer Stem Cells with Ordinary Differential Equations
Kristen Abernathy and Jeremy Burke BMC
Computational and Mathematical Methods in Medicine Volume 2016, Article ID 1239861, 11 pages
Abstract:
Despite improvements in cancer therapy and treatments, tumor recurrence is a common event in cancer patients. One explanation of recurrence is that cancer therapy focuses on treatment of tumor cells and does not eradicate cancer stem cells (CSCs). CSCs are postulated to behave similar to normal stem cells in that their role is to maintain homeostasis. That is, when the population of tumor cells is reduced or depleted by treatment, CSCs will repopulate the tumor, causing recurrence. In this paper, we study the application of the CSC Hypothesis to the treatment of glioblastoma multiforme by immunotherapy. We extend the work of Kogan et al. (2008) to incorporate the dynamics of CSCs, prove the existence of a recurrence state, and provide an analysis of possible cancerous states and their dependence on treatment levels.
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2024-09-02 | BIOMD0000000757 | BioModels
Project description:Here we performed a ChIP-seq experiment for Zeb1 trancription factor on a sample of adherent cultures of human neural stem cells (Cb192 cell line) and of a human glioblastoma cancer stem-like cell line (NCH421k). The result is the generation of the genome-wide maps for Zeb1 binding to chromatin in human neural stem cells and glioblastoma stem-like cells.
2018-04-24 | E-MTAB-5541 | biostudies-arrayexpress
Project description:Glioblastoma stem cells (GSCs) are pivotal in the recurrence and drug resistance of Glioblastoma multiforme (GBM). However, precision therapeutic and diagnostic markers for GSCs have not been fully established. Here, using bioinformatics and experimental analysis, we identified P4HB, a protein disulfide isomerase, as a serum marker that maintains stemness in GSCs through the Wnt/β-catenin signaling pathway. Transcriptional silencing of P4HB induces apoptosis and diminishes stem cell-like characteristics in GSCs. Treatments with the chemical CCF624 or the FDA-approved securinine significantly prolonged the survival in patient-derived xenograft mouse models, underscoring P4HB's potential as a therapeutic target and presenting an expedited path to clinical application through drug repurposing. Additionally, elevated P4HB levels in patient serum were found to correlate with disease progression, underscoring its utility as a biomarker and its promise for precision medicine.
2024-10-11 | GSE271707 | GEO
Project description:Overexpression of the Polycomb group protein Enhancer of Zeste Homolog 2 (EZH2) occurs in diverse malignancies, including prostate cancer, breast cancer, and glioblastoma multiforme (GBM) (1). Based on its ability to modulate transcription of key genes implicated in cell cycle control, DNA repair and cell differentiation, EZH2 is believed to play a crucial role in tissue-specific stem cell maintenance and tumor development. Here we show that targeted pharmacologic disruption of EZH2 by the S-adenosylhomocysteine hydrolase inhibitor 3-Deazaneplanocin A (DZNep), or its specific down-regulation by shRNA, strongly impairs GBM cancer stem cell self-renewal in vitro and tumor-initiating capacity in vivo. Using genome-wide expression analysis of DZNep-treated GBM cancer stem cells, we found the expression of c-myc, recently reported to be essential for GBM cancer stem cells, to be strongly repressed upon EZH2 depletion. Specific shRNA-mediated down-regulation of EZH2 in combination with chromatin immunoprecipitation (ChIP) experiments revealed that c-myc is a direct target of EZH2 in GBM cancer stem cells. Taken together, our observations provide evidence that direct transcriptional regulation of c-myc by EZH2 may constitute a novel mechanism underlying GBM cancer stem cell maintenance and suggest that EZH2 may be a valuable new therapeutic target for GBM management. Experiment Overall Design: Three samples of cancer stem-cell enriched gliospheres from primary glioblastoma multiforme cell cultures were treated with DZNep. Untreated gliospheres from the same cultures were used as controls.
2009-12-14 | E-GEOD-18150 | biostudies-arrayexpress
Project description:Glioblastoma (GBM) is the most common and aggressive primary brain tumor with limited therapeutic options, possibly because of the highly tumorigenic subpopulations of stem cell-like cells. Mechanisms that sustain cancer stem cells are crucial to tumor progression. The polycomb group protein BMI1 (BMI1 proto-oncogene, polycomb ring finger) maintains cancer hallmarks including the glioblastoma stem-like cell (GSC) state. Ubiquitin-specific protease 22 (USP22) is highly expressed in and required for the maintenance of cancer stem cells (CSCs). Previously, we observed that forced expressed microRNA-218 in glioblastoma cells led to suppressed BMI1 expression. However, the pathways engaged by USP22 or driving BMI1 accumulation in GSCs remained elusive. Here, we found USP22 to be a novel deubiquitylase of BMI1. USP22 directly deubiquitylates and stabilizes BMI1. USP22 protein levels are elevated in tumor neurosphere. USP22 depletion induces BMI1 destabilization, and results in the inhibition of GSCs self-renewal by regulating a broad range of genes involved in glioma stemness and progression. Xenograft analyses using U87MG cells showed that both USP22 and BMI1 depletion attenuated tumor growth. Clinically, the expression levels of USP22 and BMI1 were positively correlated with those common targets like POSTN, HEY2, or PDGFRA and inversely correlated with ATF3 in human glioblastoma specimens. Taken together, our data reveals that USP22 functions as a novel deubiquitylase of BMI1 and inhibits self-renewal of GSCs by stabilizing BMI1. These findings also indicate that the USP22-BMI1 axis has a critical role in glioma tumorigenesis and that targeting the axis may provide a new therapeutic approach for human glioblastoma.
2017-01-01 | GSE89239 | GEO
Project description:Glioblastoma (GBM) is thought to be driven by a sub-population of cancer stem cells (CSCs) that self-renew and recapitulate tumor heterogeneity, yet remain poorly understood. Here we present a comparative epigenomic analysis of GBM CSCs that reveals widespread activation of genes normally held in check by Polycomb repressors. These activated targets include a large set of developmental transcription factors (TFs) whose coordinated activation is unique to the CSCs. We demonstrate that a critical factor in the set, ASCL1, activates Wnt signaling by repressing the negative regulator DKK1. We show that ASCL1 is essential for maintenance and in vivo tumorigenicity of GBM CSCs. Genomewide binding profiles for ASCL1 and the Wnt effector LEF1 provide mechanistic insight and suggest widespread interactions between the TF module and the signaling pathway. Our findings demonstrate regulatory connections between ASCL1, Wnt signaling and collaborating TFs that are essential for the maintenance and tumorigenicity of GBM CSCs. Epigenomic profiling of glioblastoma stem cells
2013-05-28 | E-GEOD-46015 | biostudies-arrayexpress