MicroRNA expression profile in human Triple-Negative Breast Cancer stem cells
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE97765 | GEO | 2020/04/13
REPOSITORIES: GEO
Similar Datasets
Project description:Triple-negative breast cancer (TNBC) is the most aggressive form of breast cancer due to lack of effective targeted therapies. Here, we report that the expression of miR-4417 is suppressed during the progression of TNBC cells from non-malignant to the malignant stage. miR-4417 is localized to chromosome 1p36, a region with high loss of heterozygosity in multiple cancers, and its biogenesis is DICER-dependent. Low expression of miR-4417 is significantly associated with worse prognosis in TNBC patients, while overexpression of miR-4417 is sufficient to inhibit migration and tumorigenecity of TNBC cells in vitro. Overall, our findings suggest that miR-4417 exerts a tumor suppressive effect and thereby could serve as a prognostic biomarker and therapeutic tool against TNBC. We used microarrays to profile the global miRNA changes during EMT to identify putative tumor suppressors and prognostic biomarkers for TNBC.
2019-10-15 | GSE121657 | GEO
Project description:BACKGROUND: Triple-negative breast cancer (TNBC) is insensitive to the most effective therapies for other breast cancers, including endocrine and Her2-directed therapies, thus the lack of specific treatments prompted us to search for new TNBC-associated molecules to be used as targets for cancer therapy. As patients with TNBC usually experience a quicker relapse and metastatic progression compared to other breast cancer subtypes, we hypothesized that cancer stem cells (CSC) could play a central role in TNBC. We thus directed our focus on genes differentially expressed between CSC and differentiated cancer cells of TNBC cell lines. RESULTS: We established tumorsphere cultures from mouse and human mammary cancer cell lines to enrich the CSC population. RNA-Seq was used to identify differences in gene expression between tumorspheres and their monolayer counterparts. Seventy-four transcripts were found up-regulated in the tumorspheres, while forty-two genes were down-regulated. Enrichment analysis of biological processes showed an up-regulation in genes involved in regulation of apoptosis in tumorspheres, and a down-regulation in genes involved in lipid metabolism and cell cycle regulation. By focusing on up-regulated genes coding for cell membrane-associated proteins, we selected Teneurin-4 (TENM4) as a candidate for further studies. Meta-analysis of publicly available datasets revealed that TENM4 mRNA is up-regulated in both lobular and ductal invasive carcinoma specimens compared to normal breast, and that high expression of TENM4 in TNBC patients shows a trend of correlation with a shorter relapse-free survival. 4T1 tumorspheres treated with a siRNA specific to TENM4 showed a decrease in TENM4 mRNA and protein levels, which was reflected by a significant impairment of tumorsphere-forming ability. TENM4 silencing also led to a decrease in Focal Adhesion Kinase (FAK) phosphorylation, which has been previously linked to CSC biology, thus strengthening the possible link between TENM4 and a CSC-like phenotype. CONCLUSIONS: Overall, our results indicate that the stem-like status of TNBC cells is accompanied by altered regulation of apoptosis, cell cycle and lipid metabolism pathways. Furthermore, we identified TENM4 as a potential novel player in CSC biology, and its potential role as a novel target to improve the outcome of TNBC patients in the future.
2018-01-30 | GSE109798 | GEO
Project description:Triple negative breast cancer is an aggressive phenotypic breast cancer characterized by ER negative, PR negative and Her2 negative immunohistochemistry status. We embarked on a study to explore the transcriptome of Kenyan TNBC patients and identify potential biomarkers specific to Kenyan population. The transcriptome sequencing of tumors from Kenyan TNBC patients and comparisons with African American and Caucasian TNBC transcriptomes revealed several interesting targets and dysregulated pathways.
2021-04-28 | GSE142258 | GEO
Project description:Triple negative breast cancer (TNBC) includes basal and non-basal subclasses. To further stratify TNBC we determined microRNA (miRNA) and mRNA expression profiles, linked specific miRNA signatures to patient survival and used miRNA/mRNA anti-correlations to identify TNBC subclasses associated with expression of canonical signal pathways RNA was isolated from formalin-fixed paraffin-embedded tissue cores of 165 primary tumors, 59 adjacent normal and 54 lymph node metastatic samples and expression of 664 miRNAs and 230 cancer-associated mRNAs was assessed for each sample using the nanoString nCounter platform. Kaplan-Meier distant-disease free and overall survival curves were compared using the log-rank test. Cox proportional hazard regression and risk score analysis were used to identify miRNAs for classification of patients with significantly different prognoses.
2013-04-19 | E-GEOD-41970 | biostudies-arrayexpress
Project description:Triple negative breast cancer (TNBC) is characterized by high proliferation, poor differentiation and a poor prognosis due to high rates of recurrence. Despite lower overall incidence African American (AA) patients suffer from higher breast cancer mortality in part due to the higher proportion of TNBC cases among AA patients compared to European Americans (EA). It was recently shown that the clinical heterogeneity of TNBC is reflected by distinct transcriptional programs with distinct drug response profiles in preclinical models. In this study, we used gene expression profiling and immunohistochemistry to eluicidate potential differences between TNBC tumors of EA and AA patients on a molecular level. WG-DASL experiment of 90 FFPE samples of ER, PR and HER2 (triple) negative breast cancer samples diagnosed between 1987 and 2007. Invasive disease was identified on H&E sections by the study pathologist and one to three 1.5 mm cores were punched from the top down in the designated tumor areas of each FFPE block. The cores were deparaffinized with xylene at 50°C for 3 minutes. RNA was extracted using the RecoverAll Total Nucleic Acid Isolation kit (Applied Biosystems) following the manufacturer's protocol. The isolated RNA was hybridized to Whole-Genome DASL (HumanRef8 V 3.0, Illumina) at the Yale Center for Genome Analysis. 90 primary tumor RNA samples from 90 patients were adequate for analysis and passed Quality control.
2013-08-15 | E-GEOD-46581 | biostudies-arrayexpress
Project description:Triple negative breast cancer (TNBC) includes basal and non-basal subclasses. To further stratify TNBC we determined microRNA (miRNA) and mRNA expression profiles, linked specific miRNA signatures to patient survival and used miRNA/mRNA anti-correlations to identify TNBC subclasses associated with expression of canonical signal pathways
2013-04-19 | GSE41970 | GEO
Project description:Triple negative breast cancer (TNBC) represents a challenging tumor type due to their poor prognosis and limited treatment options. It is well recognize that clinical and molecular heterogeneity of TNBC is driven in part by post-transcriptional regulators such as miRNAs. To stratify TNBCs, we profiled 1050 miRNAs in 132 adjuvant TNBC tumors and 40 tumors from other immunophenotypes using an Affymetrix microarray platform. A NMF clustering analysis allowed us to identify 4 TNBC subtypes featuring unique miRNA expression patterns, disease free and overall survival rates and particular gene ontology enrichments (performed with GSEA algorithm). Our agglomerative approach was cross-validated by using two other clustering algorithms (k-means and consensus clustering). TNBC miRNAs subgroups were also correlated with the Lehmann intrinsic subtypes, finding a significant enrichment of immmnomodulartory and basal 1 subtypes in our high risk miRNA subgroups. 3 cell line models (MDA MB 468, MDA MB 231 and HS578T) were classified according to our miRNA signature, recapitulating two different miRNA subgroups. The TNBC tumors were compared against other phenotypes identifying differentially expressed miRNAs that together with the altered miRNAs within the subgroups allowed us to define interesting miRNAs for further functional analysis.
2018-08-16 | GSE86281 | GEO
Project description:Triple negative breast cancer (TNBC) represents a challenging tumor type due to their poor prognosis and limited treatment options. It is well recognize that clinical and molecular heterogeneity of TNBC is driven in part by post-transcriptional regulators such as miRNAs. To stratify TNBCs, we profiled 1050 miRNAs in 132 adjuvant TNBC tumors and 40 tumors from other immunophenotypes using an Affymetrix microarray platform. A NMF clustering analysis allowed us to identify 4 TNBC subtypes featuring unique miRNA expression patterns, disease free and overall survival rates and particular gene ontology enrichments (performed with GSEA algorithm). Our agglomerative approach was cross-validated by using two other clustering algorithms (k-means and consensus clustering). TNBC miRNAs subgroups were also correlated with the Lehmann intrinsic subtypes, finding a significant enrichment of immmnomodulartory and basal 1 subtypes in our high risk miRNA subgroups. 3 cell line models (MDA MB 468, MDA MB 231 and HS578T) were classified according to our miRNA signature, recapitulating two different miRNA subgroups. The TNBC tumors were compared against other phenotypes identifying differentially expressed miRNAs that together with the altered miRNAs within the subgroups allowed us to define interesting miRNAs for further functional analysis.
2018-08-16 | GSE86277 | GEO
Project description:The response to specific treatments relies on precise biomarkers, thereby avoiding undesirable toxicities and diminishing the cost. Due to the lack of treatment options in triple-negative breast cancer, it is crucial to search biomarkers with reasonable specificity and sensibility to recognize clusters of patients who could benefit from the cutting-edge oncologist treatments available nowadays. Microarrays were used to detail the global gene expression program to stratified TNBC patients according to TNBCtype software developed by Vanderbilt University and then identified lncRNAs expressed differentially through the TNBC subtypes.
2021-06-04 | GSE176128 | GEO
Project description:Triple negative breast cancer (TNBC) is characterized by high proliferation, poor differentiation and a poor prognosis due to high rates of recurrence. Despite lower overall incidence African American (AA) patients suffer from higher breast cancer mortality in part due to the higher proportion of TNBC cases among AA patients compared to European Americans (EA). It was recently shown that the clinical heterogeneity of TNBC is reflected by distinct transcriptional programs with distinct drug response profiles in preclinical models. In this study, we used gene expression profiling and immunohistochemistry to eluicidate potential differences between TNBC tumors of EA and AA patients on a molecular level.
2013-08-15 | GSE46581 | GEO