IRF4 ChIP-on-chip for Myeloma Cell Lines
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE9367 | GEO | 2008/07/07
SECONDARY ACCESSION(S): PRJNA103071
REPOSITORIES: GEO
Similar Datasets
Project description:To identify IRF4 transcription factor binding on chromatin at 5' regulatory regions of genes in myeloma cell line models. Keywords: binding site identification design Formaldehyde cross-linked, sonicated chromatin is prepared from cell lines Kms12 (test) and Ly19 (control). Chromatin immunoprecipated with anti-IRF4 antibody is labeled with Cy5 and co-hybridized on Agilent Human Promoter Set arrays with chromatin immunoprecipated with normal sera labeled with Cy3 . Two biological replicates were performed for the Kms12 and Ly19 experiments.
2010-05-25 | E-GEOD-9367 | biostudies-arrayexpress
Project description:The goal of this gene expression study was to identify genes whose expression depends on the transription factor IRF4 by knocking down it's expression using shRNA in two IRF4+ myeloma cell lines. Keywords: time series design
2008-07-07 | GSE9067 | GEO
Project description:The goal of this gene expression study was to identify genes whose expression depends on the transription factor IRF4 by knocking down it's expression using shRNA in two IRF4+ myeloma cell lines. Keywords: time series design Two myeloma lines were analyzed over a time course of IRF4-targeted shRNA induction. There are 3 time courses: two using KMS12 (biological replicates) and one with SKMM1. Within each time course there are technical replicates.
2010-05-26 | E-GEOD-9067 | biostudies-arrayexpress
Project description:Using RNA interference to identify IRF4 target genes. Keywords: time series design Gene expression was analyzed using Lymphochip cDNA spotted arrays. Myeloma cell lines were infected with control (shluc, Cy3) or shIRF4 (Cy5) constructs, and changes in gene expression were monitored over time after induction of the shRNA with doxycyclin.
2008-07-07 | E-GEOD-8958 | biostudies-arrayexpress
Project description:Using RNA interference to identify IRF4 target genes. Keywords: time series design
2008-07-07 | GSE8958 | GEO
Project description:Pharmacological inhibition of chromatin co-regulatory factors represents a clinically validated strategy to modulate oncogenic signaling through selective attenuation of gene expression. Here, we demonstrate that CBP/EP300 bromodomain inhibition preferentially abrogates the viability of multiple myeloma cell lines. Phenotypic effects are preceded by the direct transcriptional suppression of the lymphocyte-specific transcription factor IRF4 and the subsequent down-regulation of the IRF4 transcriptional program. Ectopic expression of IRF4 antagonizes the phenotypic effects of CBP/EP300 bromodomain inhibition and prevents the suppression of the IRF4 target c-MYC. These findings suggest that CBP/EP300 bromodomain inhibition represents a viable therapeutic strategy for targeting multiple myeloma and other lymphoid malignancies dependent on the IRF4 network. A total of 13 ChIP-seq samples were sequenced. Samples were treated with control (DMSO) or test compound (2.5 uM SGC-CBP30 or 0.25uM CPI267203) for 6 hours. Signal from input samples was included to subtract background signal from each ChIP-seq sample. Antibodies used were against p300, H3K18ac, H3K27ac, or BRD4.
2016-01-05 | E-GEOD-71909 | biostudies-arrayexpress
Project description:The transcription factor Interferon Regulatory Factor 4 (IRF4) is essential for the survival of the plasma cell malignancy multiple myeloma (MM), although the mechanism by which this is achieved remains unknown. Here we have explored the genetic basis for IRF4 addiction through CRISPR-Cas9 genetic ablation of IRF4 across several MM cells lines. We report that IRF4 loss uniformly resulted in the upregulation of two related pro-apoptotic proteins belonging to the BH3-only subgroup of the BCL2 family: BCL2 modifying factor (BMF) and BCL2 interacting mediator of cell death (BIM). Direct IRF4 binding was identified in the proximal promoter region of both genes. Remarkably, genetic ablation of BMF alone or in combination with BIM largely prevented the cell death that follows IRF4 inactivation, establishing that IRF4 maintains MM survival through the direct transcriptional repression of BMF and BIM.
2022-12-22 | GSE148984 | GEO
Project description:Pharmacological inhibition of chromatin co-regulatory factors represents a clinically validated strategy to modulate oncogenic signaling through selective attenuation of gene expression. Here, we demonstrate that CBP/EP300 bromodomain inhibition preferentially abrogates the viability of multiple myeloma cell lines. Phenotypic effects are preceded by the direct transcriptional suppression of the lymphocyte-specific transcription factor IRF4 and the subsequent down-regulation of the IRF4 transcriptional program. Ectopic expression of IRF4 antagonizes the phenotypic effects of CBP/EP300 bromodomain inhibition and prevents the suppression of the IRF4 target c-MYC. These findings suggest that CBP/EP300 bromodomain inhibition represents a viable therapeutic strategy for targeting multiple myeloma and other lymphoid malignancies dependent on the IRF4 network.
2016-01-05 | GSE71909 | GEO
Project description:Multiple myeloma (MM) is an incurable malignancy of plasma cells that exploits transcriptional networks driven by IRF4. To discover unique molecular vulnerabilities in MM centered on IRF4, we employ a multi-omics approach integrating functional genomics screening, spatial proteomics, and global chromatin mapping. We find that ARID1A, a member of the SWI/SNF chromatin remodeling complex, is both required for IRF4 expression and functionally associated with IRF4 protein on chromatin. Deletion of Arid1a in activated murine B cells thwarts subsequent plasma cell differentiation by disrupting IRF4-dependent transcriptional networks, therefore defining ARID1A as a novel plasma cell vulnerability. Targeting ARID1A-dependent SWI/SNF activity via SMARCA2/4 inhibition induces a rapid loss of IRF4-target gene expression and quenches global amplification of oncogenic gene expression driven by MYC, resulting in profound toxicity to MM cells. Notably, MM patients with aggressive disease have markers of SWI/SNF activity, and SMARCA2/4 inhibitors retain their activity in immunomodulatory drug (IMiD)-resistant MM cells. To fully harness the potential of these drugs, we use combinatorial drug screens to uncover profound synergistic toxicity between SMARCA2/4 and MEK inhibitors. Thus, targeting SWI/SNF activity potently represses an IRF4-MYC feed forward loop and provides a feasible path to effectively treat this incurable disease.
2024-01-11 | MSV000093842 | MassIVE
Project description:Multiple myeloma (MM) cells are addicted to MYC and its direct transactivation target IRF4 for proliferation and survival. MYC and IRF4 are still considered “undruggable” as the majority of small molecule inhibitors suffers from low potency, suboptimal pharmacokinetic properties and undesirable off-target effects. Indirect inhibition of MYC/IRF4 emerges as a therapeutic vulnerability in MM. Here, we uncover an unappreciated tumor suppressive role of C-terminal Binding Protein 2 (CTBP2) in MM via strong inhibition of the MYC-IRF4 axis. In contrast to epithelial cancers, CTBP2 is frequently downregulated in MM, in association with shortened survival, hyperproliferative features and adverse clinical outcomes. Restoration of CTBP2 exhibited potent anti-tumor effects against MM in vitro and in vivo, with marked repression of MYC-IRF4 network genes. Mechanistically, CTBP2 impeded transcription of MYC and IRF4 by histone H3 lysine 27 deacetylation (H3K27ac), and indirectly via activation of MYC repressor IFIT3. In addition, activation of interferon gene signature by CTBP2 suggested its concomitant immunomodulatory role in MM. Epigenetic studies revealed contribution of polycomb-mediated silencing and DNA methylation to CTBP2 inactivation in MM. Notably, inhibitors of Enhance of zeste homolog 2 (EZH2), histone deacetylase (HDACs) and DNA methyltransferase (DNMTs) currently under evaluation in clinical trials were effective in restoring CTBP2 expression in MM. Our findings indicated that loss of CTBP2 plays an essential role in myelomagenesis and decipher an additional mechanistic link on MYC-IRF4 dysregulation in MM. We envision that identification of novel critical regulators would facilitate the development of selective and effective approaches for treating this MYC/IRF4-addicted malignancy.
2024-03-10 | GSE255266 | GEO