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Inhibition of lysine-specific demethylase 1 inhibition in glioblastoma

ABSTRACT: Inhibition of lysine-specific demethylase 1 inhibition in glioblastoma

PROVIDER: PRJNA929532 | ENA |

REPOSITORIES: ENA

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Novel Pharmacologic Inhibition of Lysine-specific Demethylase 1 as a Potential Therapeutic for Glioblastoma [ChIP-seq]

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Project description:Lysine-specific demethylase 1 (LSD1/KDM1A) is a pivotal epigenetic enzyme that contributes to several malignancies including malignant glioma. LSD1 is a flavin adenine dinucleotide dependent histone demethylase that specifically targets histone H3 lysine (K) 4 mono- (me1) and di-methylation (me2) and H3K9me1/2 for demethylation. Herein we report the development of an LSD inhibitor, S2172, which efficiently penetrates the blood-brain barrier. S2172 effectively suppresses LSD1 enzymatic activity, resulting in the depletion of cell growth both in vitro in glioma stem cells (GSCs) (mean half-maximal inhibitory concentration (IC50) of 13.8 μM) and in vivo in a GSC orthotopic xenograft mouse model. Treatment with S2172 robustly reduced the expression of the stemness-related genes MYC and Nestin in GSC cells. Consistent with this, chromatin immunoprecipitation-sequencing revealed a significant S2172-dependent alteration in H3K4me2/H3K4me3 status. Furthermore, we identified 284 newly acquired H3K4me2 peak regions after S2172 treatment, which were encompassed within super-enhancer regions. The altered H3K4me2/H3K4me3 status induced by S2172 treatment affected the expression of genes related to tumorigenesis. Our data suggest that targeting LSD1 with S2172 could provide a promising treatment option for glioblastomas, particularly due to targeting of GSC populations.

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Novel Pharmacologic Inhibition of Lysine-specific Demethylase 1 as a Potential Therapeutic for Glioblastoma [ChIP-seq]

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Inhibition of lysine-specific demethylase 1 inhibition in glioblastoma

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Glioblastoma initiating cells are sensitive to histone demethylase inhibition due to epigenetic deregulation

Project description:Tumor-initiating cells are a subpopulation of cells that have self-renewal capacity to regenerate a tumor. Here, we identify stem cell-like chromatin features in human glioblastoma initiating cells (GICs) and link them to a loss of the repressive histone H3 lysine 9 trimethylation (H3K9me3) mark. Increasing H3K9me3 levels by histone demethylase inhibition led to cell death in GICs but not in their differentiated counterparts. The induction of apoptosis was accompanied by a loss of the activating H3 lysine 9 acetylation (H3K9ac) modification and accumulation of DNA damage and downregulation of DDR genes. Upon knockdown of histone demethylases KDM4C and KDM7A both differentiation and DNA damage was induced. Thus, the H3K9me3-H3K9ac equilibrium is crucial for GIC viability and represents a chromatin feature that can be exploited to specifically target this tumor subpopulation.

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