ABSTRACT: We performed whole genome microarrays on selected cell lines in order to identify transcriptionally regulated target genes of selected miRNAs.
Project description:IGR39 cells, seeded at a density of 6x104 cells/well in 12-well culture plates, were transfected with 5 nM of miR-211 mimic or negative control (NCM) as described in the main text. Samples for total RNA extraction were collected 48h after transfection. RNA quality was assessed using RNA 6000 NanoChips with the Agilent 2100 Bioanalyzer (Agilent, Paolo Alto, USA). Gene expression profiling experiments using GeneChipM-. Human Gene 2.0 ST arrays and miRNA profiling using GeneChipM-. miRNA arrays (Affymetrix, Santa Clara, CA, USA) were performed on two independent samples at the CRP-SantM-i Microarray Unit (Luxembourg) as described before (Reinsbach et al., 2012) and according to standard protocols. Standard pipeline from the PartekM-. Genomics SuiteTM (Partek GS) software was used for analysis of data files. Lists of genes were generated by pair-wise comparison of expression data sets (negative control vs. mimic treated samples at 48h).
Project description:We used the autophagy microarray to profile the transcriptome of well-characterized TNF sensitive MCF-7 cell line and corresponding TNF-resistant 1001 clone.
Project description:HIV-1 and HIV-2 are two etiological agents of Acquired Immune Deficiency Syndrome (AIDS). Several differences exist between these two retroviruses in terms of geographical distribution, replication, transmission and progression to AIDS. The molecular reasons explaining these features are largely unknown. One reason could rely on host factors able to differently counteract HIV replication. Among these factors, cellular microRNAs (miRNAs) have recently emerged as playing crucial roles. One aspect of the complex interplay between HIV and host miRNAs is the ability of HIV-1 to modulate host miRNAs and thereby to create favorable conditions for its replication. Here, we sought to compare the miRNA modulations elicited by HIV-1 and HIV-2 using an unbiased experimental strategy based on miRNA arrays. Surprisingly, we observed that these two unrelated HIVs similarly modulated the host miRNA repertoire, when utilizing CD4 and CXCR4 for entry. However, these modulations were different from the changes triggered by HIV-1 using CD4 and CCR5. In accordance with the mode of action of miRNAs, our observations were confirmed at the mRNA level. We concluded that co-receptor utilization (CXCR4 or CCR5), as opposed to genomic organization and phylogeny, is a key event determining the modulations of the host miRNA repertoire.
Project description:We have found expression of miR-146a up-regulated in gastric cancer. To identify new targets of miR-146a we profiled the transcriptome after miR-146a over-expression in the human gastric cancer cell line SNU638. SNU638 cells were transfected in triplicates with 50 nM miR-146a or control (siGlo) using Lipofectamine 2000. Total RNA was harvested 24 h after transfection using Trizol reagent. There are a total of six arrays included in this experiment, including three biological replicates of mRNA expression after miR-146a over-expression and three controls in SNU638 cells.
Project description:Whole genome microarray comparisons (comparative genomic hybridizations) were used to associate genotypic biomarkers among 15 Bifidobacterium longum strains exhibiting various Human Milk Oligosaccharide utilization phenotypes and host associations.
Project description:Endothelial cells derived from freshly purified human islets were incubated with microvesicles collected by ultracentrifugation of supernatants of endothelial progenitor cells (EPCs) isolated from peripheral blood of healthy volunteers.
Project description:In order to elucidate the molecular mechanisms of action of Phenytoin, we examined by microarrays the effects of prolonged administration of Phenytoin on gene expression in hippocampus and frontal cortex of Sprague-Dawley rats chronically treated with Phenytoin.
Project description:HF-1, Granta-519, SUDHL4,Oci-Ly10 and Oci-Ly3 cell lines, representing different B cell lymphoma subtypes, were induced with rituximab (R) for three hours and analyzed for differentially expressed genes compared to untreated control.