Similar Datasets
Project description:The effect of decitabine (DAC) treatment on glioma cells
| PRJNA642730 | ENA
Project description:The goals of this study are to compare transcriptome of tumor cells with p53-R282W treated by DAC
2024-04-30 | GSE173643 | GEO
Project description:Reversal of gene promoter DNA hypermethylation and associated abnormal gene silencing is an attractive approach to cancer therapy. The DNA methylation inhibitor, decitabine (5-aza-2'-deoxycitidine), is proving efficacious for hematological neoplasms especially at lower, less toxic, doses. Experimentally, high doses induce rapid DNA damage and cytotoxicity, but these may not explain the prolonged time to response seen in patients. Transient exposure of leukemic and solid tumor cells to clinically-relevant nanomolar doses, without causing immediate cytotoxicity or apoptosis, produces sustained reduced tumorigenicity, and for leukemia cells, diminished long-term self-renewal. These effects appear triggered by cellular reprogramming and include sustained decreases in promoter DNA methylation with associated gene re-expression, and anti-tumor changes in multiple key cellular regulatory pathways, most of which are high priority targets for pharmacologic anti-cancer strategies. Thus, low dose decitabine regimens appear to have broad applicability for cancer management. [Gene expression profiling] Leukemia cell lines Kasumi-1 and KG1A are treated with 10nM DAC during 72 hours and gene expression was assayed at day 3, 7 and 14 after the start of the treatment. Appropriate mock treated samples were used as control in each case. In addition, Kasumi-1 cells were also treated with a higher dose of DAC (500nM), 100nM ARA-C and 300 nM TSA, again controlled against mock treated Kasumi-1 cells, to separate dose and agent dependent effects. MCF7 was studied as an example of a solid tumor cell line. Therefore MCF7 cells were treated with 100nM DAC and results were assayed at day 1, day 3 and day 10. [Methylation profiling] The effects of the demethylating agent DAC were studied in the leukemia cell line Kasumi-1 over a 28 day time course. Intermediate time points were studied at days 3, 7, 14 and 21. These results were verfied in KG1A and KG1 leukemia cell lines, at one selected time point. The effects on one primary sample were also studied. Four normal leukemia samples (PL1, 2, 4 and 5) were used as general controls. The effect of DAC was compared to ARA-C, TSA. Both mock treated and day 3 DAC treated Kasumi-1 cells were repeated. These results were verified at one selected time point for the DAC treated MCF7 breast cancer cell line.
2012-03-21 | E-GEOD-20945 | biostudies-arrayexpress
Project description:Comparison of the miRNAs profile of 8 WHO grade II gliomas and 24 higher grade tumors (2 WHO grade III and 22 glioblastomas) in order to identify the molecular determinants of progression.
2014-03-15 | E-MTAB-1840 | biostudies-arrayexpress
Project description:Genome wide DNA methylation profiling of AML patient samples treated with PBS or DAC. The Illumina Infinium 450 Human DNA methylation was used to examine the methylation profile of 8 patient samples and 2 cell lines. Genome wide DNA methylation profiling of AML xenografts treated with either PBS control or with decitacine (DAC) alone, cytarabine (Ara-C) alone, DAC and Ara-C together (D+A), DAC followed by Ara-C (D/A) or with Ara-C followed by DAC (A/D).
2013-03-06 | GSE44830 | GEO
Project description:In order to further study the mechanism of decitabine (DAC) on MDS cell lines, 1uM DAC was used to treat SKM-1 and MDS-L cell lines, and the molecular pathway changes regulated by DAC were explored. Genes whose expression changes more than 2.0 times after drug treatment are defined as regulated genes. Taking the intersection change of the two cell lines, it was found that compared with the control, 541 genes were up-regulated in the intersection of gene changes treated with DAC, and 762 genes were down-regulated. Gene expression profile analysis shows that DAC can significantly affect various cell biological processes, including antiviral response, immune response, inflammatory response and cell apoptosis.
2021-01-26 | GSE164744 | GEO
Project description:Our study had shown that DAC treatment enhanced immunogenecity of EL4 cells. To explore the mechanisms of DAC-induced tumor immunity, we carried out cDNA microarray analyses to compare the differential expression of genes between DAC and PBS treated EL4 cells.
2013-02-15 | GSE38473 | GEO
Project description:Genome wide DNA methylation profiling of AML patient samples treated with PBS or DAC. The Illumina Infinium 450 Human DNA methylation was used to examine the methylation profile of 8 patient samples and 2 cell lines. Genome wide DNA methylation profiling of AML xenografts treated with either PBS control or with decitacine (DAC) alone, cytarabine (Ara-C) alone, DAC and Ara-C together (D+A), DAC followed by Ara-C (D/A) or with Ara-C followed by DAC (A/D). DNA was extracted from patient bone marrow samples and xenograft bone marrow samples using Qiagen Allprep kit. Bisulphite converted DNA from all samples were hybridised to the Illumina Infinium 450 Human Methylation arrays and for each analysis the drug treated sample was compared to the corresponding PBS control sample.
2013-03-06 | E-GEOD-44830 | biostudies-arrayexpress
Project description:Our study had shown that DAC treatment enhanced immunogenecity of EL4 cells. To explore the mechanisms of DAC-induced tumor immunity, we carried out cDNA microarray analyses to compare the differential expression of genes between DAC and PBS treated EL4 cells. Two-condition experiment, PBS treated EL4 vs. Decitabine treated EL4 cells. Biological replicates: 3 PBS treated, 3 Decitabine treated, independently treatment and harvested. One replicate per array.
2013-02-15 | E-GEOD-38473 | biostudies-arrayexpress
Project description:Decitabine (DAC) is used clinically for myelodysplastic syndromes (MDS) and acute myeloid leukemia (AML). Our genome-wide CRISPR-dCas9 activation screen using MDS-derived AML cells shows that mitotic regulation plays a pivotal role in DAC resistance. DAC strongly induces abnormal mitosis (abscission failure or tripolar mitosis) in human myeloid tumors at clinical concentrations, especially in those with TP53 mutations and antecedent hematological disorders. This DAC-induced mitotic disruption and apoptosis are significantly attenuated in DNMT1-depleted cells. In contrast, the overexpression of Dnmt1, but not the catalytically inactive mutant, enhances DAC-induced mitotic defects in myeloid tumors. We also demonstrate that DAC-induced mitotic disruption is enhanced by pharmacological inhibition of the ATR-CLSPN-CHK1 pathway. These data challenge the current assumption that DAC inhibits leukemogenesis through DNMT1 inhibition and subsequent DNA hypomethylation, while highlighting the potent activity of DAC to perturb mitosis through aberrant DNMT1-DNA covalent bonds.
2023-08-14 | GSE240570 | GEO