MiRNA expression profiling of Human Myeloma Cell Lines Pre- and Post- 5'azacytidine Treatment
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
SUBMITTER: Chong-Lei Bi
PROVIDER: E-GEOD-53850 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:We performed genome-wide miRNA expression profiling (MEP) of a panel of four human Myeloma cell lines treated with 5'azacytidine compared to control (DMSO treatment), with the objective of unmasking miRNAs silenced by DNA hypermethylation.
2015-08-31 | GSE53850 | GEO
Project description:Methylation of DNA in combination with histone modifications establishes an epigenetic code that ensures the proper control of gene expression. Although DNA methyltransferases have been shown to interact with histone methyltransferases such as EZH2 (which methylates histone H3 on lysine 27) and G9a (which methylates histone H3 on lysine 9), the relationship between DNA methylation and repressive histone marks has not been fully studied. In cancer cells, promoters of genes are often aberrantly methylated. Accordingly, 5-azacytidine (a DNA demethylating drug) is used for treating patients with myelodysplastic syndrome. However, no genome-scale studies of the effects of this drug have been reported. In this work, we report the effects of 5-azacytidine on global gene expression and analyze ~24,000 human promoters using ChIP-chip to determine how 5-azacytidine treatment effects H3K27me3 and H3K9me3 levels. We found that (1) 5-azacytidine treatment results in large changes in gene regulation with distinct functional categories of genes showing increased (e.g. C2H2 zinc finger transcription factors) and decreased (e.g. genes involved in regulation of mitochondria and oxidoreductase activity) levels; (2) most genes that show altered expression are not regulated by promoters that display DNA methylation prior to the treatment; (3) certain gene classes switch their repression mark upon treatment with 5-azacytidine (from H3K27me3 to H3K9me3 and vice versa); and (4) most changes in gene expression are not due to relief of repression mediated by DNA or histone methylation. 5 ChIP-chip arrays. 6 gene expression samples: 3 treatments with 2 biological replicates per treatment.
2010-04-09 | E-GEOD-20598 | biostudies-arrayexpress
Project description:Purpose: We applied RNA sequencing technology for high-throughput analysis of transcriptional changes within human MM cell lines JJN3 and U266 due to individual and combination drug treatment. Methods: JJN3 and U266 cells were treated with pan-HDACi panbobinostat, DNMTi 5-Azacytidine, panobinostat+5-Azacytidine or NMP for 4h or 24h in triplicate and transcriptional changes assessed by RNAseq using Illumina HiSeq platform. Specifically, JJN3 cells were treated with 10nM panobinostat, 2.5µM 5-Azacytidine, panobinostat+5-Azacytidine (at given doses), or 10mM NMP. U266 cells were treated with 10nM panobinostat, 10µM 5-Azacytidine, panobinostat+5-Azacytidine (at given doses), or 10mM NMP. Results: We report unique and overlapping transcriptional signatures that lead to the induction of apoptosis in human MM cell lines in a cell-specific manner due to individual or combination treatments. Conclusions: A detailed analysis of differential transcriptional events in human MM cell lines due to HDACi, DNMTi, HDACi+DNMTi and NMP appear to define the molecular events leading to apoptosis and drug mechanism of action. We tested triplicate experiments at 4h and 24hr time points in JJN3 and U266 cell lines against vehicle control treated cells.
2014-04-09 | E-GEOD-56623 | biostudies-arrayexpress
Project description:The whole exome sequencing experiment is part of the study: “Analysis of 5-azacytidine resistance models reveals a set of targetable pathways”. In the study we generated myelodysplastic syndrome/acute myeloid leukemia (MDS/AML) OCI-M2 cell lines as well as patient-derived bone marrow cell lines that are resistant to hypomethylating therapy by 5-azacytidine (AZA). By integrated analysis of expression and mutation data obtained from these samples we have identified multiple signaling pathways whose modulation by specific small molecule inhibitors significantly block proliferation of AZA-resistant cell lines without increasing their sensitivity to AZA. The understanding of the molecular mechanisms which characterize the AZA-R phenotype can be used for broadening therapeutic options at progressing states during AZA therapy.
2022-05-02 | E-MTAB-11172 | biostudies-arrayexpress
Project description:MCF7 cells at 80% confluency were treated with 5 micromolar azacytidine with gene expression profiling determined at 0, 1, 2, 3, 4, 6 and 12 hours of exposure to compound. Keywords: time course Approximately 5,000,000 million cells were plated into 10 cm plates from a common pool. Cells were grown in DMEM supplemented with 10% foetal calf serum until 80% confluency was attained. Cells were then exposed to 5 micromolar azacytidine prepared as a 10 millimolar stock in DMSO. Each time point was represented by three biological replicates. Total RNA was extracted from the cells using the trizol method and RNA samples were validated for integrity throughout the isolation and extraction procedure. All gene expression profiles showed similar distributions with similar raw median intensities.
2008-01-11 | E-GEOD-10145 | biostudies-arrayexpress
Project description:This data is a subset of the miRQC study, submitted for publication in summer of 2013. The purpose of the study was to compare various aspects of miRNA profiling platform performance (reproducibility, sensitivity, accuracy, etc) using a standardized set of samples. The data included in this submission is a subset of the study data generated on the Agilent miRNA profiling system. The array used was designed to measure all of the human and human viral miRNAs in miRBase 16.0 and the is annotated based on miRBase 18. Analysis for the miRQC study was based only on the human sequences present in miRBase 18 (8 sequences were deleted between 16.0 and 18.0) miRNA profiling on a standardized set of 20 samples.
2014-06-10 | E-GEOD-49453 | biostudies-arrayexpress
Project description:Mesenchymal progenitor cells can be differentiated in vitro into myotubes that exhibit many characteristic features of primary mammalian skeletal muscle fibers. However, in general, they do not show the functional excitation-contraction coupling or the striated sarcomere arrangement typical of mature myofibers. Epigenetic modifications have been shown to play a key role in regulating the progressional changes in transcription necessary for muscle differentiation. In this study, we demonstrate that treatment of murine C2C12 mesenchymal progenitor cells with 10 µM of the DNA methylation inhibitor 5-azacytidine (5AC) promotes myogenesis, resulting in myotubes with enhanced maturity as compared to untreated myotubes. Specifically, 5AC treatment resulted in the upregulation of muscle genes at the myoblast stage while at later stages nearly 50 % of the 5AC-treated myotubes displayed a mature, well-defined sarcomere organization as well as spontaneous contractions that coincided with action potentials and intracellular calcium transients. Both the percentage of striated myotubes and their contractile activity could be inhibited by 20 nM TTX, 10 µM ryanodine and 100 µM nifedipine, suggesting that action potential-induced calcium transients are responsible for these characteristics. Our data suggest that genomic demethylation induced by 5AC overcomes an epigenetic barrier that prevents untreated C2C12 myotubes from reaching full maturity. C2C12 cells were plated at 1500 cells/cm2 (day -1), cultured for 1 day in DMEM 10%NCS, then treated (d0) with or without 10uM 5-azacytidine (5AC) for an additional 3 days. RNA was extracted on day 3 and hybridized to GeneChip Mouse Genome 430 2.0 array (Affymetrix).
2012-01-01 | E-GEOD-30192 | biostudies-arrayexpress
Project description:To understand the roles of molecules in functional differentiation among adult human tissues, we performed a systematic survey of mRNA, protein, and protein phosphorylation as well as miRNA expression, in three tissues: cerebellum, prefrontal cortex and liver. We found that tissues were clearly distinct from one another at all levels. Furthermore, our results showed that miRNA differently expressed between tissues have significant, but modest effect on expression of mRNA and somewhat stronger effect on expression of proteins among the tissues. Notably, miRNA preferentially targeted gene regulators, transcription factors and kinases, in all three tissues studied. Following this path, we found that miRNA effect was further amplified through expression changes of target transcription factors and kinases, leading to further changes in their targets’ expression and phosphorylation levels. Importantly, miRNA regulation leads to reduced, rather than increased gene expression variation among individuals between two brain regions. These observations uncover the complexity of miRNA regulatory interactions and are compatible with suggested role of miRNA in gene expression canalization. Adult human post-mortem tissue samples: cerebellum, prefrontal cortex and liver, were collected. Each tissue contains three individuals totalling 9 samples in this datasets. RNA extracted from these dissected tissue was hybridized to Agilent Human miRNA Microarray.
2013-01-04 | E-GEOD-19505 | biostudies-arrayexpress
Project description:DNA topoisomerase I (Top1) is required for transcription as it relaxes positive and negative supercoils by forming transient Top1 cleavage complexes (Top1cc) up- and down-stream of transcription complexes. However, Top1cc can also be trapped by endogenous DNA lesions and by camptothecin (CPT) and its anticancer derivatives, which results in transcription blocks. Here, we undertook a genome-wide analysis of the effects of CPT on gene expression at exon resolution. We tested the impact of Top1 inhibition on miRNA expression at the genome-wide level in human colon carcinoma HCT116. The miRNA of cells treated with camptothecin (CPT) for were measured at several timepoints with Agilent Human miRNA Microarray V3 (8x15K).
2013-04-17 | E-GEOD-37357 | biostudies-arrayexpress
Project description:This data is a subset of the miRQC study, submitted for publication in summer of 2013. The purpose of the study was to compare various aspects of miRNA profiling platform performance (reproducibility, sensitivity, accuracy, etc) using a standardized set of samples. The data included in this submission is a subset of the study data generated on the Agilent miRNA profiling system. The array used was designed to measure all of the human and human viral miRNAs in miRBase 16.0 and the is annotated based on miRBase 18. Analysis for the miRQC study was based only on the human sequences present in miRBase 18 (8 sequences were deleted between 16.0 and 18.0)
2014-06-10 | GSE49453 | GEO