Fluvastatin-induced differential global gene expression in human metastatic MDA-MB-231 breast cancer cells
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
SUBMITTER: Srigiridhar Kotamraju
PROVIDER: E-GEOD-59007 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:The current study analyzed the altered expression profiles of genes that are responsible for fluvastatin-induced breast cancer cell death in MCF-7 cells (ER+ve luminal breast cancer cells). Some of these altered gene expressions were further inter connceted to various pathways which may eventually be recognised as drug targets/ biomarkers in statin-sensitve breast cancer patients. To understand the differential gene expression profile in fluvastatin treated (24 h) malignant breast cancer cells with untreated malignant breast cancer cells.
2014-09-01 | E-GEOD-59006 | biostudies-arrayexpress
Project description:The current study analyzed the altered expression profiles of genes that are responsible for fluvastatin-induced breast cancer cell death in MCF-7 cells (ER+ve luminal breast cancer cells). Some of these altered gene expressions were further inter connceted to various pathways which may eventually be recognised as drug targets/ biomarkers in statin-sensitve breast cancer patients.
2014-09-01 | GSE59006 | GEO
Project description:The current study analyzed the altered expression profiles of genes that are responsible for fluvastatin-induced breast cancer cell death in MDA-MB-231 cells (ER-ve basal breast cancer cells). Some of these altered gene expressions were further inter connceted to various pathways which may eventually be recognised as drug targets/ biomarkers in statin-sensitve breast cancer patients.
2014-09-01 | GSE59007 | GEO
Project description:Background: Cholesterol pathway inhibition by statins prevents breast cancer development in mouse models of breast cancer but their efficacy is not very high (about 50%) . Therefore, the goal of this study is to investigate if the fluvastatin mediated upregulation in the steroid biosynthesis pathway genes limit the efficacy of statin chemoprevention. Methods: A published gene signature of statin resistance was validated in cell line-based models of inherent and acquired resistance during breast cancer. These signatures were next validated in a mouse model of hormone receptor negative breast cancer. Results: We found more than 70% of a published multi-gene fluvastatin resistance signature to be significantly upregulated in an inherently resistant cell line relative to fluvastatin sensitive cell line. We found this inherent statin resistance gene signature to be also shared with the signature of acquired resistance to fluvastatin (13 / 23 total genes). These 13 inherent resistance genes and 10 additional genes mapped to 2 of the top 3 deregulated pathways that are steroid-, and terpenoid backbone- biosynthesis pathway. Next, we tested if one or multiple genes of statin resistance signature, could predict efficacy of statin chemoprevention in the SV40 C3TAg transgenic mouse model. We found upregulation of a large number (19/24) of genes in the tumor bearing mammary glands, suggesting that upregulation of these pathways drives resistance to statin chemoprevention. A subset of 13-genes from this panel was significantly associated with response to statin treatment, as was the expression level of HMGCR alone in a mouse model of breast cancer. Lastly, we studied if a 10-day period of fluvastatin treatment to SV40C3 TAg mice, can also trigger the upregulation of these genes and provide an early signal of statin resistance. These experiments showed that a 10-day period is insufficient to cause a feedback upregulation in steroid biosynthesis pathway genes and thus cannot be used as an early biomarker to detect resistance to fluvastatin. Conclusions: High basal or restorative upregulation in the steroid biosynthesis pathway gene expression after fluvastatin treatment appears to be strongly associated with resistance to statin chemoprevention for breast cancer and may serve as a biomarker to identify patients that are most likely to respond to statins or develop resistance.
2022-03-01 | GSE174673 | GEO
Project description:Both EZH2 and NF-?B contribute to aggressive breast cancer, yet whether the two oncogenic factors have functional cross-talk in breast cancer is largely unknown. Here, we uncover an unexpected role of EZH2 in conferring the constitutive activation of NF-?B target gene expression in ER-negative basal-like breast cancer cells. This function of EZH2 is independent of its histone methyltransferase activity but requires the physical interaction with RelA/RelB to promote the expression of NF-?B targets. Intriguingly, EZH2 acts oppositely in repressing NF-?B targets in ER-positive luminal-like breast cancer cells by interacting with ER and directing repressive histone methylation. Thus, EZH2 function as a double-facet molecule in breast cancers, functioning either as a transcriptional activator or repressor of NF-?B targets, in a cell context-dependent manner. These findings reveals an additional mechanism by which EZH2 promotes breast cancer progression and also underscore the need for developing context-specific strategy for therapeutic targeting of EZH2 in breast cancers. 12 samples were analyzed including three replicates of siNC CTRL and siEZH2 CTRL.
2011-08-14 | E-GEOD-30670 | biostudies-arrayexpress
Project description:Oct4, a key transcription factor for maintaining the pluripotency and self-renewal of stem cells has been reported previously. It also plays an important role in tumor proliferation and apoptosis, but the role of Oct4 been in tumor metastasis is still not very clear. Here, we found that ectopic expression of Oct4 in breast cancer cells can inhibit their migration and invasion. Detailed examinations revealed that Oct4 up-regulates expression of E-cadherin, indicative of its inhibitory role in epithelial-mesenchymal transition (EMT). RNA-sequence assay showed that Oct4 down-regulates expression of Rnd1. As an atypical Rho protein, Rnd1 can affect cytoskeleton rearrangement and regulate cadherin-based cell-cell adhesion by antagonizing the typical Rho protein, RhoA. Ectopic expression of Rnd1 in MDA-MB-231 cells changes cell morphology which influences cell adhesion and increases migration. It is reported that EMT is accompanied by cytoskeleton remodeling, we hypothesized that Rnd1 may play a role in regulating EMT. Over-expression of Rnd1 can partly rescue the inhibitory effects induced by Oct4, not only migration and invasion, but also in E-cadherin level and cellular morphology. Furthermore, silencing of Rnd1 can up-regulate the expression of E-cadherin in MDA-MB-231 cells. These results present evidence that ectopic expression of Oct4 increases E-cadherin and inhibits metastasis, effects which may be related to Rnd1 associated cell-cell adhesion in breast cancer cells. Examination of mRNA profiles in MDA-MB-231 cells with OCT4 overexpressing
2014-01-25 | E-GEOD-54392 | biostudies-arrayexpress
Project description:This experiment aims at investigating the effect of AT2 overexpression and/or activation in breast cancer. Human breast cancer cells MDA-MB-231 were transfected with lentiviral construct containing flagged human AT2 receptor sequence (or empty vector) and were subcutaneously injected into immuno-deficient mice (2. 10e6 cells). When the tumors reached 5 mm3 volume, mice were treated daily with compound C21 (0.3 mg/kg) or vehicle for 43 days. Total RNA was extracted from tumors and submitted to DNA array analysis.
2020-11-07 | E-MTAB-8532 | biostudies-arrayexpress
Project description:Clinical data of patients suffering from COVID-19 have indicated that statin therapy, used to treat hypercholesterolemia, is associated with a better clinical outcome. We therefore investigated the effect of statins on SARS-CoV-2 infection in human lung cells and found that fluvastatin inhibited coronavirus infection, while other tested statins did not. Fluvastatin inhibited high and low pathogenic coronaviruses in vitro and ex vivo in a dose-dependent manner. Proteomic analyses of infected versus uninfected lung epithelial cells treated with fluvastatin, simvastatin, or rosuvastatin revealed that all tested statins modulated the cholesterol synthesis pathways without compromising the innate antiviral immune response. Strikingly, fluvastatin treatment uniquely affected the proteome of SARS CoV 2 infected cells, specifically downregulating proteins that modulate protein translation and viral replication. These results suggest that statin therapy poses no additional risk to individuals exposed to SARS-CoV-2 and that fluvastatin may have a moderate beneficial effect on SARS CoV-2 infection by modulating protein translation.
2021-12-07 | PXD023422 | Pride
Project description:To further investigate the molecular mechanisms by which EVs mediated the abnormal localization of tight junction proteins and adherence junction protein, we performed miRNA microarray analysis of extracellular vesicles isolated from breast cancer cells. miRNA expression in extracellular vesicles was collected from MDA-MB-231-D3H1, MDA-MB-231-D3H2LN, BMD2a and BMD2b breast cancer cell lines.
2015-04-02 | E-GEOD-63445 | biostudies-arrayexpress
Project description:Adipose tissue is a metabolic and endocrine organ that secretes numerous bioactive molecules called adipocytokines. Among these, adiponectin has been argued to have a crucial role in obesity-associated breast cancer. The key molecule of adiponectin signaling is AMP-activated protein kinase (AMPK), mainly activated by Liver Kinase B1 (LKB1). Here, we demonstrated how the ERalfa/LKB1 interaction may negatively interfere with the capability of LKB1 to phosphorylate AMPK and then inhibit its downstream signaling TSC2/mTOR/p70S6k. In MCF-7 cells upon adiponectin AMPK signaling was not working, keeping its downstream protein Acetyl-CoA Carboxylase (ACC) still active. In contrast, in MDA-MB-231 cells the phosphorylation of AMPK and ACC was enhanced with consequent inhibition of both lipogenesis and cell growth. Thus, upon adiponectin, ERalfa signaling switched the energy balance of breast cancer cells towards a lipogenic phenotype. In other words, adiponectin in all the concentrations tested played an inhibitory role on ERalpha-negative breast cancer cell growth and progression either in vitro or in vivo. In contrast, low adiponectin levels, similar to those circulating in obese patients, worked on ERalfa-positive cells as a growth factor, stimulating their growth and progression. The latter effect seems to be blunted in vivo only in the presence of high adiponectin concentration. Based on the present results, it can be concluded that if we prospectively address adiponectin as a pharmacological tool, a separate therapeutic treatment should be carefully assessed in ERalfa-positive and negative breast-cancer patients.
2020-02-27 | E-MTAB-6120 | biostudies-arrayexpress