Project description:Dicer, RNase III endonuclease, is an essential enzyme in miRNA biogenesis that regulates target gene expression, and it has been reported that aberrant expressions of Dicer associate with the clinical outcomes of patients in various cancers. To explore the miRNA differencial expression regulated by Dicer in MDA-MB-231/E1A cells, the microarray profiling analysis was employed to conduct differentially expressed miRNAs in stable MDA-MB-231/vector, MDA-MB-231/E1A, and MDA-MB-231/E1A/shDicer cells.
Project description:Identification of genes that are involved in self-seeding by comparing gene expression profiles between parental MDA-MB-231 cells and seeder cells (MDA-231-S1a and S1b) 2 replicates from each sample (parental MDA-MB-231, MDA-MB-231 S1a and MDA-MB-231 S1b) were analyzed
Project description:Dicer, RNase III endonuclease, is an essential enzyme in miRNA biogenesis that regulates target gene expression, and it has been reported that aberrant expressions of Dicer associate with the clinical outcomes of patients in various cancers. To explore the miRNA differencial expression regulated by Dicer in MDA-MB-231/E1A cells, the microarray profiling analysis was employed to conduct differentially expressed miRNAs in stable MDA-MB-231/vector, MDA-MB-231/E1A, and MDA-MB-231/E1A/shDicer cells. The four groups including vector control, E1A-expressing and Dicer knockdown in E1A-expressing MDA-MB-231 cells were harvested and RNA were isolated. Two independent experiments were performed for each group.
Project description:RNA was isolated from ectopically sFRP1-expressing MDA-MB-231 cells and control MDA-MB-231 cells and as well from tumor lysates arising from these cells as nude mouse xenograft. Gene expression profiles for these samples were investigated using Affymetrix arrays.
Project description:The transcriptional profile of MDA-MB-231 cells silenced for CYTOR (LINC00152, long intergenic non-protein coding RNA 152) was compared to LNA-control-treated MDA-MB-231 cells to identify potential CYTOR targets.
Project description:Small-molecule Smac mimetics target inhibitor of apoptosis (IAP) proteins to induce TNFα-dependent apoptosis in cancer cells and several Smac mimetics have been advanced into clinical development as a new class of anticancer drugs. However, preclinical studies have shown that only a small subset of cancer cell lines are sensitive to Smac mimetics used as single agents and these cell lines are at risk of developing drug resistance to Smac mimetics. Thus, it is important to understand the molecular mechanisms underlying intrinsic and acquired resistance of cancer cells to Smac mimetics in order to develop effective therapeutic strategies to overcome or prevent Smac mimetic resistance. We established Smac mimetic resistant sublines derived from MDA-MB-231 breast cancer cells, which exhibit exquisite sensitivity to the Smac mimetic SM-164, and used microarrays to detail the global programme of gene expression underlying SM-164 resistance in MDA-MB-231 cells and identified differentially expressed genes in SM-164-resistant and -sensitive MDA-MB-231 cells. SCID mice with MDA-MB-231 xenograft tumors were treated with 5 mg/kg of SM-164 intravenously for 5 days/week for 2 weeks. SM-164-regressed MDA-MB-231 tumors regrew after treatment ended. Tumor cells from these regrown MDA-MB-231 tumors were isolated and total RNAs were prepared for microarray analysis.
Project description:Progression to stage IV disease remains the main cause of breast cancer-related deaths. Increasing knowledge of the hematogenous phase of metastasis is key for exploiting the entire window of opportunity to interfere with early dissemination and to achieve a more effective disease control. On the hypothesis that the distinguishing molecular features of circulating tumor cells (CTCs) reveal useful information on metastasis biology and disease outcome, we compared the transcriptomes of CTCs and solid primary/secondary lesions of the MDA-MB-231 xenograft model and provided evidence that blood-borne dissemination is regulated by numerous genes. Our new CTC-specific signature improved CTC detection and outcome prognostication in early-stage breast cancer patients compared to conventional CTC markers, and shed light on the metastatic process by highlighting the role of two genes.
Project description:Progression to stage IV disease remains the main cause of breast cancer-related deaths. Increasing knowledge of the hematogenous phase of metastasis is key for exploiting the entire window of opportunity to interfere with early dissemination and to achieve a more effective disease control. On the hypothesis that the distinguishing molecular features of circulating tumor cells (CTCs) reveal useful information on metastasis biology and disease outcome, we compared the transcriptomes of CTCs and solid primary/secondary lesions of the MDA-MB-231 xenograft model and provided evidence that blood-borne dissemination is regulated by numerous genes. Our new CTC-specific signature improved CTC detection and outcome prognostication in early-stage breast cancer patients compared to conventional CTC markers, and shed light on the metastatic process by highlighting the role of two genes.
Project description:Breast cancer line MDA-MB-231 was cultured in complete culture medium containing high glucose DMEM (4.5 g/L) supplemented with 10% fetal bovine serum, 2 mM L-glutamine and 1% antibiotic-antimycotic solution ( Gibco) in an MCO-18AC incubator (Sanyo, Japan) at 37ºC and 5% CO2 concentration in the air. Cell reseeding was carried out every 2-3 days according to the standard protocol. The protocol for obtaining the MDA-MB-231 cell line with stable knockdown of IGFBP6 was described previously (Nikulin et al., 2021).
Project description:Identification of genes that are involved in self-seeding by comparing gene expression profiles between parental MDA-MB-231 cells and seeder cells (MDA-231-S1a and S1b)