Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA129153 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:This SuperSeries is composed of the following subset Series: GSE22790: Gene expression after treatment with anti-miR-191 or control GSE22793: miR expression after treatment with anti-miR-191 or control GSE22909: Influence of TCDD onto HCC cell line Refer to individual Series
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Project description:We have sequenced miRNA libraries from human embryonic, neural and foetal mesenchymal stem cells. We report that the majority of miRNA genes encode mature isomers that vary in size by one or more bases at the 3’ and/or 5’ end of the miRNA. Northern blotting for individual miRNAs showed that the proportions of isomiRs expressed by a single miRNA gene often differ between cell and tissue types. IsomiRs were readily co-immunoprecipitated with Argonaute proteins in vivo and were active in luciferase assays, indicating that they are functional. Bioinformatics analysis predicts substantial differences in targeting between miRNAs with minor 5’ differences and in support of this we report that a 5’ isomiR-9-1 gained the ability to inhibit the expression of DNMT3B and NCAM2 but lost the ability to inhibit CDH1 in vitro. This result was confirmed by the use of isomiR-specific sponges. Our analysis of the miRGator database indicates that a small percentage of human miRNA genes express isomiRs as the dominant transcript in certain cell types and analysis of miRBase shows that 5’ isomiRs have replaced canonical miRNAs many times during evolution. This strongly indicates that isomiRs are of functional importance and have contributed to the evolution of miRNA genes
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Project description:HepG2 cell lines were treated with TCDD, as an activator for the TF AhR/arnt since it is a known ligand for AhR. Hepatocellular carcinoma (HCC) is a fatal disease with currently very limited beneficial therapies. MicroRNAs (miRs), which are considered to be master regulators of gene expression, have significant influence on cellular pathways and phenotype, and are de-regulated in HCC, and hence are thought to be of great therapeutic potential as novel targets. We identified hsa-miR-191 as a potential target for HCC therapy. Inhibition of this miR causes decreased cell proliferation and induction of apoptosis in vitro as well as a significant reduction of tumor mass in vivo in an orthotopic liver xenograft model. This miR was also found to be up-regulated by a dioxin, a known liver carcinogen, and was found to be a key regulator of cancer related pathways. HCC cell lines treated with TCDD and control. Although this experiment was done with dual channel, chanels are not compared, irrelevant samples were on the reciprocal channel. Sample data tables represent relevant, single channel data.
2011-07-01 | E-GEOD-22909 | biostudies-arrayexpress