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Breast cancer cell lines treated with EZH2 inhibitor compounds

ABSTRACT: Loss of H3K27me3 repressive chromatin histone marks, maintained by the histone methyltransferase (HKMT) EZH2, may lead to reversal of epigenetic silencing in tumor cells and have therapeutic potential. Using a cell-based assay, we have identified three compounds from a HKMT inhibitor chemical library which re-express H3K27me3 mediated, silenced genes. Chromatin immunoprecipitation verified a decrease in silencing marks (H3K27me3, H3K9me3) and importantly an increase in active marks (H3K4me2/3, H3K27ac) at the promoter of re-expressed genes. Compound treated breast tumor cells induced enrichment for genome-wide changes in expression of known target genes for EZH2 and induced cell growth inhibition: with most sensitive breast tumor cell lines having low EZH2 protein expression, while a normal epithelial breast line was least sensitive.

ORGANISM(S): Homo sapiens

PROVIDER: GSE36131 | GEO | 2013/08/27

SECONDARY ACCESSION(S): PRJNA152943

REPOSITORIES: GEO

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Breast cancer cell lines treated with EZH2 inhibitor compounds

Project description:Loss of H3K27me3 repressive chromatin histone marks, maintained by the histone methyltransferase (HKMT) EZH2, may lead to reversal of epigenetic silencing in tumor cells and have therapeutic potential. Using a cell-based assay, we have identified three compounds from a HKMT inhibitor chemical library which re-express H3K27me3 mediated, silenced genes. Chromatin immunoprecipitation verified a decrease in silencing marks (H3K27me3, H3K9me3) and importantly an increase in active marks (H3K4me2/3, H3K27ac) at the promoter of re-expressed genes. Compound treated breast tumor cells induced enrichment for genome-wide changes in expression of known target genes for EZH2 and induced cell growth inhibition: with most sensitive breast tumor cell lines having low EZH2 protein expression, while a normal epithelial breast line was least sensitive. Agilent SurePrint G3 Human 8x60k two-colour microarrays were used to profile gene expression changes induced by treatment with drug compounds in MDA MB-231 cells, both at 24h and 48h. 4 replicates were used for each drug, time combination. A separate untreated control sample was used for comparison with each replicate.

2013-08-27 | E-GEOD-36131 | biostudies-arrayexpress

Affinify Purification of EZH2 and phosphodeficient EZH2 identifies phosphorylation dependent interactions of EZH2

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2018-07-03 | PXD010073 | Pride

Sox4 is a master regulator of epithelial-mesenchymal transition (EMT) by controlling Ezh2 expression and epigenetic reprogramming

Project description:Gene expression profiling has uncovered the transcription factor Sox4 with up-regulated activity during TGFÎ²-induced EMT in normal and cancerous breast epithelial cells. Sox4 is indispensable for EMT and cell survival in vitro and for primary tumor growth and metastasis in vivo. Among several EMT-relevant genes, Sox4 directly regulates the expression of Ezh2, encoding the Polycomb group histone methyltransferase that trimethylates histone 3 lysine 27 (H3K27me3) for gene repression. Ablation of Ezh2 expression prevents EMT, while forced expression of Ezh2 restores EMT in Sox4-deficient cells. Ezh2-mediated H3K27me3 marks associate with key EMT genes, representing an epigenetic EMT signature that predicts patient survival. Our results identify Sox4 as a master regulator of EMT by governing the expression of the epigenetic modifier Ezh2. Our Dataset comprises of 12 ChIP-seq samples using chromatin from NMuMG cells which was immunoprecipitated using H3K27me3-specific antibody during TGFÎ²-induced EMT (2ng/ml) at 6 different stages (day 0, 1, 4, 7, 10, 20).

2013-06-20 | E-GEOD-45579 | biostudies-arrayexpress

Sox4 is a master regulator of epithelial-mesenchymal transition (EMT) by controlling Ezh2 expression and epigenetic reprogramming

Project description:Gene expression profiling has uncovered the transcription factor Sox4 with up-regulated activity during TGFβ-induced EMT in normal and cancerous breast epithelial cells. Sox4 is indispensable for EMT and cell survival in vitro and for primary tumor growth and metastasis in vivo. Among several EMT-relevant genes, Sox4 directly regulates the expression of Ezh2, encoding the Polycomb group histone methyltransferase that trimethylates histone 3 lysine 27 (H3K27me3) for gene repression. Ablation of Ezh2 expression prevents EMT, while forced expression of Ezh2 restores EMT in Sox4-deficient cells. Ezh2-mediated H3K27me3 marks associate with key EMT genes, representing an epigenetic EMT signature that predicts patient survival. Our results identify Sox4 as a master regulator of EMT by governing the expression of the epigenetic modifier Ezh2.

2013-06-20 | GSE45579 | GEO

Genome-wide maps of chromatin modifications in wild-type or mutant HAP1 cells

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Epigenetic Maintenance of Stemness and Malignancy in Peripheral Neuroectodermal Tumors by EZH2

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EZH2-mediated H3K27 trimethylation mediates neurodegeneration in ataxia-telangiectasia

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Epigenetic Maintenance of Stemness and Malignancy in Peripheral Neuroectodermal Tumors by EZH2

2009-06-02 | GSE15890 | GEO

Effects of Brca1 knock-down on Ezh2 targeting

Project description:The Polycomb repressive complex 2 (PRC2) is important for the maintenance of stem cell pluripotency and suppression of cell differentiation by promoting histone H3 lysine 27 trimethylation (H3K27me3) and silencing expression of genes regulating differentiation. Here we show decreased expression of BRCA1 promotes EZH2 re-targeting genome wide and enhances H3K27me3 levels at PRC2 target loci in mouse ES cells.

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