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Transcription profiling by array of human hormone-responsive MCF-7 cells versus estrogen-deprived breast cancer cells

ABSTRACT: Estrogen deprivation using aromatase inhibitors is currently the standard of care for patients with estrogen-receptor (ER)-positive breast cancer. Unfortunately, prolonged estrogen deprivation leads to drug resistance (i.e. hormone-independent growth). We therefore used DNA microarray analysis to study the gene expression profiles of wild-type MCF-7 cells (which are sensitive to antihormone therapy) and long-term estrogen deprived MCF-7:5C and MCF-7:2A breast cancer cells (which are resistance to estrogen-deprivation; aromatase inhibitor resistant). Transcriptional profiling of wild-type MCF-7 cells and estrogen deprived MCF-7:5C and MCF-7:2A cells was performed using Affymetrix Human Genome U133 Plus 2.0 Array. Experiment Overall Design: We wanted to study the gene expression profiles of the different cell lines in their growth media without any drug treatment. Therefore, MCF-7, MCF-7:5C, and MCF-7:2A cells were grown in estrogen-free media (phenol red-free RPMI medium supplemented with 10% 4X dextran-coated charcoal-treated fetal bovine serum) until they were 70-80% confluent then RNA was extracted, labeled, and hybridized to the Affymetrix Human Genome U133 Plus 2.0 Arrays.

ORGANISM(S): Homo sapiens

SUBMITTER: Lewis-Wambi Dr Joan

PROVIDER: S-ECPF-GEOD-10879 | biostudies-other |

REPOSITORIES: biostudies-other

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Transcription profiling by array of human hormone-responsive MCF-7 cells versus estrogen-deprived breast cancer cells

Project description:Estrogen deprivation using aromatase inhibitors is currently the standard of care for patients with estrogen-receptor (ER)-positive breast cancer. Unfortunately, prolonged estrogen deprivation leads to drug resistance (i.e. hormone-independent growth). We therefore used DNA microarray analysis to study the gene expression profiles of wild-type MCF-7 cells (which are sensitive to antihormone therapy) and long-term estrogen deprived MCF-7:5C and MCF-7:2A breast cancer cells (which are resistance to estrogen-deprivation; aromatase inhibitor resistant). Transcriptional profiling of wild-type MCF-7 cells and estrogen deprived MCF-7:5C and MCF-7:2A cells was performed using Affymetrix Human Genome U133 Plus 2.0 Array. Experiment Overall Design: We wanted to study the gene expression profiles of the different cell lines in their growth media without any drug treatment. Therefore, MCF-7, MCF-7:5C, and MCF-7:2A cells were grown in estrogen-free media (phenol red-free RPMI medium supplemented with 10% 4X dextran-coated charcoal-treated fetal bovine serum) until they were 70-80% confluent then RNA was extracted, labeled, and hybridized to the Affymetrix Human Genome U133 Plus 2.0 Arrays.

2008-04-05 | E-GEOD-10879 | biostudies-arrayexpress

Expression data of hormone-responsive MCF-7 cells versus estrogen-deprived MCF-7:5C and MCF-7:2A breast cancer cells

2008-03-19 | GSE10879 | GEO

Transcription profiling by array of human MCF cells treated with estrogen

Project description:The estrogen receptor is the master transcriptional regulator of breast cancer phenotype and the archetype of a molecular therapeutic target. We mapped all estrogen receptor and RNA polymerase II binding sites on a genome-wide scale, identifying the authentic cis binding sites and target genes, in breast cancer cells. Combining this unique resource with gene expression data demonstrates distinct temporal mechanisms of estrogen-mediated gene regulation,particularly in the case of estrogen-suppressed genes. Furthermore, this resource has allowed the identification of cis-regulatory sites in previously unexplored regions of the genome and the cooperating transcription factors underlying estrogen signaling in breast cancer. Experiment Overall Design: This Series currently contains the gene expression data accompaning Carroll JS et al. Nature Genetics 38,1289-1297(2006). MCF7 cells were stimulated with 100 nM estrogen for 0, 3, 6, or 12h. All experiments were performed in triplicate.

| S-ECPF-GEOD-11324 | biostudies-other

Transcription profiling by array of human MCF-7 breast cancer cells

Project description:Estrogen-responsive genes were identified by transcript profiling of estrogen-treated MCF-7 breast cancer cells. The gene expression profile generated after estrogen treatment was compared with that following inducible expression of c-Myc or c-Zip (a deletion mutant of c-Myc that lacks the N-terminal transactivation domains) in clonal MCF-7 cell lines. Experiment Overall Design: RNA was collected in three independent experiments, each including parental MCF-7 cells treated with 17b-estradiol (E2) or ethanol (EtOH), zinc-treated p-delta-MT-c-Myc cells, zinc-treated p-delta-MT-c-Zip cells and zinc-treated empty vector (p-delta-MT) cells. Cells were arrested for 48 h with 10 nM ICI 182780 and then treated for 6 h with either 100 nM E2 or ethanol vehicle, or 75 mM zinc for the stably transfected cell lines.

| S-ECPF-GEOD-11791 | biostudies-other

Transcription profiling by array of human MCF-7 TET Off breast cancer cells (MCF-7 wt) to investigate unliganded Estrogen Receptor Beta on miRNome downstream target regulation

Project description:MCF-7 TET Off cells (MCF-7 wt) were used to produce stable clones expressing ER-beta tagged with TAP-tag at the C-term (C-TAP-ER-beta). All cells were grown in Dulbecco's modified Eagle's medium (DMEM), starved by using DMEM w/o phenol red and 5% Dextran Coated Charcoal stripped serum (DCC-FBS) for 5 days. Cells were transfected wiyh hsa-miR-30a-5p Mimics and with tha negative control Scramble both at concentration of 5 and 10 nM. Biological replicate were lysed and RNA extracted were pooled 24 hrs after transfectiions. For mRNA expression profiling, 500 ng total RNA were reverse transcribed and used for synthesis of cDNA and biotinylated cRNA. Finally cRNA were hybridized for 19 hours on Illumina HumanHT-12 v4.0 BeadChips and after scanning, data analysis was performed.

| S-ECPF-MTAB-1493 | biostudies-other

c-Src Modulates Estrogen-Induced Stress and Apoptosis in Estrogen-Deprived Breast Cancer Cells [MCF-7:5C]

Project description:The emergence of anti-estrogen resistance in breast cancer is an important clinical phenomenon affecting long-term survival in this disease. Identifying factors that convey cell survival in this setting may guide improvements in treatment. Estrogen (E2) can induce apoptosis in breast cancer cells that have been selected for survival after E2 deprivation for long periods (MCF-7:5C cells), but the mechanisms underlying E2-induced stress in this setting have not been elucidated. Here, we report that the c-Src kinase functions as a key adapter protein for the estrogen receptor (ER, ESR1) in its activation of stress responses induced by E2 in MCF-7:5C cells. E2 elevated phosphorylation of c-Src, which was blocked by 4-hydroxytamoxifen (4-OHT), suggesting that E2 activated c-Src through the ER. We found that E2 activated the sensors of the unfolded protein response (UPR), IRE1α (ERN1) and PERK kinase (EIF2AK3), the latter of which phosphorylates eukaryotic translation initiation factor-2α (eIF2α). E2 also dramatically increased reactive oxygen species production and upregulated expression of heme oxygenase HO-1 (HMOX1), an indicator of oxidative stress, along with the central energy sensor kinase AMPK (PRKAA2). Pharmacologic or RNA interference-mediated inhibition of c-Src abolished the phosphorylation of eIF2α and AMPK, blocked E2-induced ROS production, and inhibited E2-induced apoptosis. Together, our results establish that c-Src kinase mediates stresses generated by E2 in long-term E2-deprived cells that trigger apoptosis. This work offers a mechanistic rationale for a new approach in the treatment of endocrine-resistant breast cancer. MCF-7:5C cells were treated with vehicle (0.1% EtOH) as control, E2 (10-9mol/L), 4-OHT (10-6mol/L), E2 (10-9mol/L) plus 4-OHT (10-6mol/L), PP2 (5x10-6mol/L), and E2 (10-9mol/L) plus PP2 (5x10-6mol/L) respectively for 72 hours.

| S-ECPF-GEOD-59535 | biostudies-other

Transcription profiling of human MCF-7 Breast Cancer Cells reveals crosstalk between Estrogen and TNFalpha

Project description:Study was carried out to examine how E2 and TNFa together influence gene expression in breast cancer cells compared to either factor alone. Experiment Overall Design: MCF-7 cells were treated with 10 nM E2, 10 ng/ml TNFa, or both for 2h. Experiment was carried out in triplicate.

| S-ECPF-GEOD-11467 | biostudies-other

Transcription profiling by array of MCF-7 and MDA-MB-213 cells treated with docetaxel

Project description:Two breast cancer cell lines, MCF-7 and MDA-MB-213, were treated progressively with docetaxel.

| S-ECPF-MEXP-3982 | biostudies-other

Transcription profiling by array of human breast cancer MCF-7 cells treated with 17-AAG

Project description:17-AAG treatment of MCF-7 Microarray Files containing additional statistical analysis and data for meta-probesets are available on the FTP site for the experiment, in E-MTAB-339.additional.zip

| S-ECPF-MTAB-339 | biostudies-other

Transcription profiling by array of membrane-bound and cytosolic polysomes from Homo sapiens MCF-7 cells

Project description:RNA from MCF-7 cells was fractionated by sucrose density gradient centrifugation to separate RNA associated with membrane-bound polysomes from RNA associated with free polysomes. These two populations were hybridized in triplicate to U133A microarrays.

| S-ECPF-GEOD-1400 | biostudies-other

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