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Effect of decitabine, carboplatin and their combination on gene expression in the YB5 colon cancer cell line.

ABSTRACT: YB5 cell line is a clonal derivative of the SW48 colon cancer cell line that contains a single copy of a green fluorescent protein (GFP) reporter silenced by CpG methylation at its CMV promoter. We treated the YB5 cells with decitabine (5-aza-2’-deoxycytidine), carboplatin and the combination of decitabine plus carboplatin and analyzed the effects of the drugs on gene expression.

ORGANISM(S): Homo sapiens

PROVIDER: GSE66279 | GEO | 2015/09/08

SECONDARY ACCESSION(S): PRJNA276312

REPOSITORIES: GEO

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Effect of decitabine, carboplatin and their combination on gene expression in the YB5 colon cancer cell line.

Project description:YB5 cell line is a clonal derivative of the SW48 colon cancer cell line that contains a single copy of a green fluorescent protein (GFP) reporter silenced by CpG methylation at its CMV promoter. We treated the YB5 cells with decitabine (5-aza-2’-deoxycytidine), carboplatin and the combination of decitabine plus carboplatin and analyzed the effects of the drugs on gene expression. YB5 cells in the early log phase of growth were seeded at 3.5 million in 20 ml of culture medium in 10 cm diameter tissue culture plates at day 0. The cells were treated with 20 microliters of decitabine (final concentration 25 nM), carboplatin (final concentration 20 uM) or both at days 1, 2, 3 and 4. Control cells were treated with 20 microliters of diluent (DMSO). The cells were harvested at day 6. Total RNA was extracted by TRIZOL, labeled with Cy5 (control cells) or Cy3 (treated cells) and hybridized on Agilent Whole Genome Array (G4112F). Raw data from the Agilent scanner were loess normalized using Bioconductor packages limma and agilp.

2015-09-08 | E-GEOD-66279 | biostudies-arrayexpress

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SUM159 BrCa Decitabine Gene Expression

Project description:Dysregulation of DNA methylation is an established feature of breast cancers. DNA demethylating therapies like decitabine are proposed for the treatment of triple-negative breast cancers (TNBCs) and indicators of response need to be identified. For this purpose, we characterized the effects of decitabine in a panel of 10 breast cancer cell lines and observed a range of sensitivity to decitabine that was not subtype-specific. Knockdown of potential key effectors demonstrated the requirement of deoxycytidine kinase (DCK) for decitabine response in breast cancer cells. In treatment-naive breast tumors, DCK was higher in TNBCs, and DCK levels were sustained or increased post chemotherapy treatment. This suggests that limited DCK levels will not be a barrier to response in TNBC patients treated with decitabine as a second line treatment or in a clinical trial. Methylome analysis revealed that genome-wide, region-specific, tumor suppressor gene-specific methylation, and decitabine-induced demethylation did not predict response to decitabine. Gene set enrichment analysis (GSEA) of transcriptome data demonstrated that decitabine induced genes within apoptosis, cell cycle, stress, and immune pathways in decitabine treated cells. Induced genes included those characterized by the viral mimicry response; however knockdown of key effectors of the pathway did not affect decitabine sensitivity suggesting that breast cancer growth suppression by decitabine is independent of viral mimicry. Finally, taxol-resistant breast cancer cells expressing high levels of multidrug resistance transporter ABCB1 remained sensitive to decitabine, suggesting that the drug could be used as second-line treatment for chemoresistant patients. We used microarrays to determine genome-wide expression changes induced by DNA de-methylating agent decitabine in breast cancer cell lines

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Project description:Treatment of cancer cells with anti-cancer drugs often fails to achieve complete remission. Yet, such drug treatments may induce alteration in the tumor’s gene expression patterns, including those of Cancer/Testis Antigens (CTA). The degradation products of such antigens can be presented as HLA peptides on the surface of the tumor cells and be developed into anti-cancer immunotherapeutics. For example, the DNA methyl transferase inhibitor, 5-aza-2'-deoxycytidine (Decitabine) has limited anti-tumor efficacy, yet it induces the expression of many genes, including CTAs that are normally silenced in the healthy adult tissues. In this study, the presentation of many new HLA peptides derived from CTAs and induced by Decitabine was demonstrated in three human Glioblastoma cell lines. Such presentation of CTA-derived HLA peptides can be exploited for development of new treatment modalities, combining drug treatment with anti-CTA targeted immunotherapy. The Decitabine-induced HLA peptidomes include many CTAs that are not normally detected in healthy tissues or in cancer cells, unless treated with the drug. In addition, the study included large-scale analyses of the simultaneous effects of Decitabine on the transcriptomes, proteomes and HLA peptidomes of the human Glioblastoma cells. It demonstrates the poor correlations between these three levels of gene expression, both in their total levels and in their response to the drug.

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