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NDRG1 siRNA and overexpression in breast cell lines

ABSTRACT: N-myc downstream-regulated gene 1 (*NDRG1*) is induced by cellular stress such as hypoxia and DNA damage, and in humans, germ line mutations cause Charcot-Marie-Tooth disease. However, the roles of NDRG1 in the cell are not fully understood. Previously, NDRG1 was shown to mediate doxorubicin resistance under hypoxia, suggesting a role for NDRG1 in cell survival under these conditions. We found decreased apoptosis in doxorubicin-treated cells expressing NDRG1 shRNAs under normoxia, demonstrating a requirement for NDRG1 in apoptosis in breast epithelial cells under normal oxygen pressure. We further compared expression profiles in human breast epithelial cells ectopically over-expressing NDRG1 with cells expressing NDRG1 shRNAs in order to identify biological pathways where NDRG1 is involved. The results suggest that NDRG1 may have roles connected to vesicle transport. The previously reported roles of NDRG1 in apoptosis, myelin sheet maintenance, enhanced exocytosis in mast cells and in cellular responses to hypoxia, heavy metals, and androgen may all converge by NDRG1 having a role linked to vesicle transport. SUM102 and ME16C2 stably transduced with siRNA against NDRG1 compared with empty vector control ZR-75-1 stably transduced with NDRG1 overexpression construct compared with empty vector control Two condition design

ORGANISM(S): Homo sapiens

SUBMITTER: Elisabet Gjernes

PROVIDER: E-GEOD-33437 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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MCF-7 and ZR-75-1 cell lines hypoxia

Project description:N-myc downstream-regulated gene 1 (*NDRG1*) is induced by cellular stress such as hypoxia and DNA damage, and in humans, germ line mutations cause Charcot-Marie-Tooth disease. However, the roles of NDRG1 in the cell are not fully understood. Previously, NDRG1 was shown to mediate doxorubicin resistance under hypoxia, suggesting a role for NDRG1 in cell survival under these conditions. We found decreased apoptosis in doxorubicin-treated cells expressing NDRG1 shRNAs under normoxia, demonstrating a requirement for NDRG1 in apoptosis in breast epithelial cells under normal oxygen pressure. We further compared expression profiles in human breast epithelial cells ectopically over-expressing NDRG1 with cells expressing NDRG1 shRNAs in order to identify biological pathways where NDRG1 is involved. The results suggest that NDRG1 may have roles connected to vesicle transport. The previously reported roles of NDRG1 in apoptosis, myelin sheet maintenance, enhanced exocytosis in mast cells and in cellular responses to hypoxia, heavy metals, and androgen may all converge by NDRG1 having a role linked to vesicle transport. Two condition design, MCF-7 and ZR-75-1 cell lines grown in hypoxia compared to cells grown at normoxia.

2011-11-04 | E-GEOD-33438 | biostudies-arrayexpress

MCF-7 and ZR-75-1 cell lines hypoxia

2011-11-04 | GSE33438 | GEO

NDRG1 siRNA and overexpression in breast cell lines

2011-11-04 | GSE33437 | GEO

Global gene expression analysis reveals a link between NDRG1 and vesicle transport.

Project description:This SuperSeries is composed of the following subset Series: GSE33437: NDRG1 siRNA and overexpression in breast cell lines GSE33438: MCF-7 and ZR-75-1 cell lines hypoxia Refer to individual Series

2011-11-04 | E-GEOD-33439 | biostudies-arrayexpress

ACLY and ACC1 Regulate Hypoxia-Induced Apoptosis by Modulating ETV4 via Î±-ketoglutarate

Project description:In order to propagate a solid tumor, cancer cells must adapt to and survive under various tumor microenvironment (TME) stresses, such as hypoxia or lactic acidosis. To systematically identify genes that modulate cancer cell survival under stresses, we performed genome-wide shRNA screens under hypoxia or lactic acidosis. We discovered that genetic depletion of acetyl-CoA carboxylase (ACACA or ACC1) or ATP citrate lyase (ACLY) protected cancer cells from hypoxia-induced apoptosis. Additionally, loss of ACLY or ACC1 reduced levels and activities of the oncogenic transcription factor ETV4. Silencing ETV4 also protected cells from hypoxia-induced apoptosis and led to remarkably similar transcriptional responses as with silenced ACLY or ACC1, including an anti-apoptotic program. Metabolomic analysis found that while Î±-ketoglutarate levels decrease under hypoxia in control cells, Î±-ketoglutarate is paradoxically increased by hypoxia when ACC1 or ACLY are depleted. Supplementation with Î±-ketoglutarate rescued the hypoxia-induced apoptosis and recapitulated the decreased expression and activity of ETV4 via an epigenetic mechanism. Therefore, ACC1 and ACLY regulate the levels of ETV4 under hypoxia via increased Î±-ketoglutarate. These results reveal that ACC1/ACLY- Î±-ketoglutarate-ETV4 is a novel means by which metabolic states regulate transcriptional output for life vs. death decisions under hypoxia. Since many lipogenic inhibitors are under investigation as cancer therapeutics, our findings suggest that the use of these inhibitors will need to be carefully considered with respect to oncogenic drivers, tumor hypoxia, progression and dormancy. More broadly, our screen provides a framework for studying additional tumor cell stress-adaption mechanisms in the future. DESIGN: H1975 lung cancer cells transduced with a scramble shRNA hairpin or two different shRNAs against ACLY, ACC1, or ETV4 under hypoxia.

2015-12-10 | E-GEOD-61286 | biostudies-arrayexpress

Transcription profiling of human SK-MEL-2 melanoma cell line transfected with E2F-1 and doxorubicin or transfected with a LacZ control plus doxorubicin to investigate the molecular mechanisms of a combination of E2F-1 gene therapy and chemotherapy.

Project description:SK-MEL-2 cells treated with Ad-E2F-1 (MOI 2), Ad-E2F-1 (MOI 2)plus doxorubicin 0.1uM, or Ad-LacZ (MOI 2) plus doxorubicin 0.1uM. The combination of E2F-1 gene therapy and chemotherapy produces a synergistic effect on melanoma cell apoptosis. However, the molecular mechanisms have not been fully elucidated. The purpose of this study was to identify novel genes or pathways that may play key roles in apoptosis when E2F-1 gene therapy is combined with doxorubicin chemotherapy. MATERIALS AND METHODS: SK-MEL-2 melanoma cells were infected with Ad-E2F-1 alone, Ad-E2F-1 plus doxorubicin, or Ad-LacZ plus doxorubicin. After 16 hours of treatment, the total RNA was extracted from these cells and subjected to microarray analysis. Quantitative real-time PCR was performed to confirm the microarray data. RESULTS: Our results showed that the combination treatment of Ad-E2F-1 and doxorubicin affected the expression of cytokines, transcription factors, as well as genes involved in signal transduction, cell cycle regulation and apoptosis. CONCLUSION: Our findings have identified, for the first time, novel molecular targets and pathways that led to apoptosis in melanoma cells when Ad-E2F-1 was combined with doxorubicin. The molecular information provided here will enhance further mechanistic studies.

2007-10-27 | E-GEOD-2715 | biostudies-arrayexpress

MicroRNA-769-3p down-regulated NDRG1 and enhanced apoptosis in MCF-7 during reoxygenation.

Project description:In this study, breast cancer MCF-7 cells were cultured under 0.5% oxygen for 24 h followed by 24 h of reoxygenation. Cells was harvested at 0, 1, 12, and 24 h during reoxygenation, and examined the miRNA profile by Nanostring nCounter. Forty-three miRNAs had dramatic changes as compared with 0 h upon reoxygenation, with 63% (n=27) of the miRNAs up-regulated upon reoxygenation. Among these miRNAs, miR-769-3p, which was down-regulated in MCF-7 upon reoxygenation, was chosen for further investigation. The hypothesis was that the down-regulation of NDRG1 upon reoxygenation was regulated by miRNAs. To examine wether miRNAs regulate NDRG1 under 0.5% O2 concentrations, the miRNA expression profiles of MCF-7 cells under reoxygenation were examined. Cells were harvested at 0 (hypoxia control), 1, 12, and 24 h upon reoxygenation. Each profile was done in triplicate. The genomic profile of miRNAs was measured using NanoString nCounterÂ® miRNA Expression Assays.

2016-10-23 | E-GEOD-51689 | biostudies-arrayexpress

expression data from NDRG1 depleted SKBR3 cells

Project description:SKBR3 cells expressing NDRG1 shRNA1 or vector control were harvested by trypsinization and total RNA was extracted. Silencing NDRG1 reduces cell proliferation rates, causing lipid metabolism dysfunction including increased fatty acid incorporation into neutral lipids and lipid droplets. global changes in transcriptome due to NDRG1 silencing were observed

2018-06-21 | GSE112841 | GEO

Effect of NDRG1 deletion and hypoxia in mouse placenta

2013-04-26 | GSE46381 | GEO

Effect of NDRG1 deletion and hypoxia in mouse placenta

Project description:We sought to identify changes in placental gene expression that may contribute to the phenotype of NDRG1-deficient embryos, and to define the contribution of hypoxia and fetal sex to these changes. We therefore used high-density oligonucleotide microarrays to interrogate differences in placental gene expression, stratified by fetal sex, Ndrg1 status (WT vs KO) and oxygenation (21% vs 12%). C57Bl6/J mice heterozygous for NDRG1-null allele were bred and separated next day (E0.5), and give ad libitum access to standard chow and water with 12h light:dark cycle. Pregnant dams were sacrificed at E15.5 by cervical dislocation following isoflurane anesthesia. Following sacrifice, embryos and placentas were collected, NDRG1 genotype and sex were determined by PCR of fetal tissue, and RNA was extracted from placental tissue following removal of membranes.

2013-04-26 | E-GEOD-46381 | biostudies-arrayexpress

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