Expression array
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
SUBMITTER:
PROVIDER: E-MTAB-2209 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
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. Experiment Overall Design: MDA-MB-231 human breast cancer cells were stably transfected with human sFRP1 encoding vector or empty vector as control. After the selection with antibiotics, three clones of MDA-MB-231/sFRP1 and three clones of MDA-MB-231/control were selected. These six clones were cultured individually in DMEM 10% FCS with 1mg/ml G-418. When cells reached 70-80% confluence, RNA was isolated from the cells. In parallel, the three clones of MDA-MB-231/sFRP1 and the three clones of MDA-MB-231/control were pooled respectively. One million of cells from each pool were suspended in 100ul PBS and injected to fat pads of female balb/c nude mice (6 mice were injected with MDA-MB-231/sFRP1 and 5 mice were injected with MDA-MB-231/control) to do a xenograft experiment. A few - several weeks after, mice were sacrificed when tumor reached a certain size, tumors were taken and RNA was isolated using trizol reagent.
2009-05-11 | E-GEOD-13806 | biostudies-arrayexpress
Project description:Microarray data to accompany Gauger et al. (2009) Cancer Cell International paper A treated X untreated design was used whereby immortalized human mammary epithelial cell lines (TERT cells) were modified to stably express an siRNA that knocked down SFRP1 expression. These "treated" cells were labeled with Cy5 and four replicate harvests were hybridized to Agilent 4by44k whole genome microarrays, along with a Cy3 labeled untreated control. The untreated control consisted of 4 pooled harvests of the parent cell line in normal growth conditions at 60-80% confluence.
2010-05-08 | E-GEOD-15948 | biostudies-arrayexpress
Project description:Transcription profiling by array of human breast cancer cell lines BT20 and SKBR3 comparing mock clones to SFRP1 expressing clones to determine those molecules, genes and biochemical pathways modulated after forced SFRP1 re-expression
2015-06-22 | E-MTAB-2209 | ExpressionAtlas
Project description:The ets transcription factor ELF5 specifies the differentiation of mammary progenitor cells to establish the milk-secreting lineage. ER- and poor prognosis basal breast cancers arise from this progenitor cell and these cancers express high levels of Elf5. Knockdown of ELF5 expression in basal breast cancer cell lines, or forced expression in luminal breast cancer cell lines, resulted in reduced cell proliferation. Transcript profiling and chromatin immunoprecipitation revealed that the transcriptional activity of ELF5 specified the gene expression patterns that distinguish basal from luminal breast cancer, including suppression of FOXA1, GATA3 and ER, key estrogen-action genes. Tamoxifen treatment of luminal MCF7 cells upregulated Elf5 expression and cells that acquired resistance to Tamoxifen became dependent on ELF5 for proliferation. ELF5 is a regulator of breast cancer cell proliferation, transcriptionally specifies the basal molecular subtype and is utilised by ER+ breast cancer cells to escape proliferative arrest caused by Tamoxifen. ChIP-Seq using an antibody to ELF5, in T47D breast carcinoma cell lines
2012-12-27 | E-GEOD-31216 | biostudies-arrayexpress
Project description:The ets transcription factor ELF5 specifies the differentiation of mammary progenitor cells to establish the milk-secreting lineage. ER- and poor prognosis basal breast cancers arise from this progenitor cell and these cancers express high levels of Elf5. Knockdown of ELF5 expression in basal breast cancer cell lines, or forced expression in luminal breast cancer cell lines, resulted in reduced cell proliferation. Transcript profiling and chromatin immunoprecipitation revealed that the transcriptional activity of ELF5 specified the gene expression patterns that distinguish basal from luminal breast cancer, including suppression of FOXA1, GATA3 and ER, key estrogen-action genes. Tamoxifen treatment of luminal MCF7 cells upregulated Elf5 expression and cells that acquired resistance to Tamoxifen became dependent on ELF5 for proliferation. ELF5 is a regulator of breast cancer cell proliferation, transcriptionally specifies the basal molecular subtype and is utilised by ER+ breast cancer cells to escape proliferative arrest caused by Tamoxifen. Elf5 was knocked down via siRNA in basal HCC1937 cell lines, in triplicate. Elf5 was induced in luminal T47D and MCF7 cell lines via a doxycycline inducible expression vector, in duplicate.
2012-12-27 | E-GEOD-30405 | biostudies-arrayexpress
Project description:Sfrp1 is a Wnt inhibitor that is down regulated in various human cancers such as acute myeloid leukaemia, hepatocellular carcinoma, pancreatic, ovarian and breast cancer etc. Our study has shown that the loss of Sfrp1 in mouse skin leads to early tumor initiation with induced skin chemical carcinogenesis. Further, CSCs isolated from the Sfrp1-/- tumors showed increased in vivo tumorigenic potential with enhanced tumor propagating cell (TPC) frequency when injected into NOD/SCID mice. Hence, in order to understand the molecular mechanism involved in CSC regulation in the absence of sfrp1, we have performed microarray analysis on CSCs isolated from mice skin SCC. The data showed upregulation of genes involved in the regulation of tumor aggressiveness, metastasis and stemness in Sfrp1-/- CSCs as compared to WT CSCs. Our study has provided significant contribution to the existing knowledge of Sfrp1 by showing the uncharted role of Sfrp1 in tumor initiation and CSC regulation.
2020-01-30 | GSE141176 | GEO
Project description:The 17beta-hydroxy steroid dehydrogenase family is involved in the fine tuning of conversion of different substances such as steroids, retenoids and fatty acids. The expression of HSD17B14 has been correlated to better prognosis in breast cancer. The function of HSD17B14 is still not known, but it may convert estradiol to estrone. We transfected breast cancer cell lines with a HSD17B14-containing plasmid and compared with mock-transfected samples. The influence on global gene expression was examined with microarrays. The breast cancer cell lines SKBR3 and ZR75-1 were transfected with a HSD17B14-containing plasmid or a plasmid without insertion as control. This was performed in duplicates. The cells were harvested after 48 hours, and RNA was extracted and hybridized on Affymetrix microarrays.
2015-03-01 | E-GEOD-26998 | biostudies-arrayexpress
Project description:The Foxl2 transcription factor is required for ovarian function during follicular development. Our approach to begin to understand Foxl2 function is through the identification of Foxl2 regulated genes in the ovary. Transiently transfected KK1 mouse granulosa cells were used to identify genes that are potentially regulated by Foxl2. KK1 cells were transfected in three groups (mock, activated, and repressed) and twenty-four hours later RNA was isolated and submitted for Affymetrix microarray analysis. Experiment Overall Design: To increase the potential of Foxl2 to alter gene expression levels of putative target genes, two fusions were constructed consisting of Foxl2 fused to the activation domain of the Herpes simplex virus VP16 transcription factor (Foxl2-VP16) and Foxl2 fused to the repression domain of the murine MAD transcription factor (Foxl2-MAD). Levels of gene expression were compared between mock transfected cells and those that were transfected with Foxl2-VP16 and Foxl2-MAD, respectively.
2009-11-15 | E-GEOD-18891 | biostudies-arrayexpress
Project description:In order to identify patterns of gene expression that are associated with the putative tumor suppressor gene ITIH5 mediated suppression of breast cancer metastatic growth, we performed a transcriptomic micro-array analysis of the MDA-MB-231 wildtype, three independent highly aggressive MDA-MB-231-mock clones and four independent weak aggressive MDA-MB-231-ITIH5 clones. Related methylation profiling data are found under accession <a href='../E-MTAB-5081/'>E-MTAB-5081</a>.
2017-01-30 | E-MTAB-1813 | biostudies-arrayexpress
Project description:In the absence of adaptive immunity displayed by animals, plants respond locally to biotic challenge via inducible basal defense networks activated through recognition and response toconserved pathogen associated molecular patterns (PAMPs). In addition, immunity can be induced in tissues remote from infection sites via systemic acquired resistance (SAR), initiated following gene-for-gene recognition between plant resistance proteins and microbial effectors.The nature of the mobile signal and remotely activated networks responsible for establishing SAR remain unclear. Here we show that despite the absence of PAMP contact, systemically responding leaves rapidly activate a SAR transcriptional signature with strong similarity to local basal defense. Jasmonates have previously been implicated in systemic signalling in response to wounding and plant herbivory but not SAR. We present several lines of evidence that suggest jasmonates may also be central to SAR. Jasmonic acid (JA) rapidly accumulates in phloem exudates of leaves challenged with an avirulent strain of Pseudomonas syringae. In systemically responding leaves transcripts associated with jasmonate biosynthesis are upregulated and JA increases transiently. SAR can be mimicked by foliar JA application and is abrogated in mutants impaired in jasmonate synthesis or response. We conclude that, jasmonate signalling appears to mediate long-distance information transmission. Moreover, the systemic transcriptional response shares extraordinary overlap with local herbivory and wounding responses, indicating that jasmonates may be central to an evolutionarily conserved signalling network, which decodes multiple abiotic and biotic stress signals. Experimenter name: William Truman; Experimenter phone: +44 (0)1392 263789; Experimenter fax: +44 (0)1392 263434; Experimenter address: School of Biosciences; Experimenter address: Geoffrey Pope Building; Experimenter address: Stocker Road; Experimenter address: Exeter; Experimenter address: Devon; Experimenter zip/postal_code: EX4 4QD; Experimenter country: UK Experiment Overall Design: 9 samples were used in this experiment
2008-06-15 | E-GEOD-6831 | biostudies-arrayexpress