Unknown,Transcriptomics,Genomics,Proteomics

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Gene expression in E9.5 trunks comparing wt with Arid3b-null embryos

ABSTRACT: We have analysed and compared mRNA expression between wt embryos and embryos deficient for Arid3b in E9.5 trunks, with the aim of identifying differentially expressed genes that could give us a clue to the functions of Arid3b during development. Trunks were dissected from E9.5 embryos (including the body from the otic vesicle to somite 15 and forelimbs). Four wild-type and four mutant embryos were collected and pooled for each of the microarray triplicates.

ORGANISM(S): Mus musculus

SUBMITTER: Juan Jose Sanz-Ezquerro

PROVIDER: E-GEOD-62071 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Human mesenchymal stem cells (hMSC) have an extensive potential for clinical applications in cell therapy. However, very little is known of the specific molecular regulatory mechanisms that control the therapeutical properties of these cells. We aimed to identify microRNAs (miRNAs) that could be involved in controlling the transition between the self-renewing (undifferentiated) and the reparative (differentiated) phenotypes of hMSCs. MicroRNA microarrays were used to identify miRNAs that are upregulated in undifferentiated hMSCs. For that, we compared the miRNA expression profiles of undifferentiated bone marrow-derived hMSCs with the same primary cell lines after 9 days of in vitro adipogenic or osteogenic induction. We also compared the miRNA expression profiles of undifferentiated hMSCs with skin fibroblasts (a mesenchymal cell lineage with a more restricted differentiation potential). These experiments allowed us to identify miR-335 as the only miRNA downregulated upon MSC differentiation as well as in MSCs in comparison with skin fibroblasts. Gene expression microarrays were used to identify genes that are downregulated in hMSCs overexpressing miR-335. We compared the miRNA expression profiles of hMSCs transduced with a lentiviral vector encoding miR-335 with MSCs transduced with a control lentiviral vector. Our results suggest miR-335 downregulation could be one of the triggers for the initiation of MSCs activities involved in tissue repair and remodelling, including cell migration and differentiation. We compared the miRNA expression profiles of undifferentiated bone marrow-derived hMSCs with the same primary cell lines after 9 days of adipogenic or osteogenic induction, as well as with skin fibroblasts. A total of four independent samples were used for each condition. For the adipogenic/osteogenic vs. undifferentiated MSC comparison, the RNA samples were pooled (two independent samples/pool) before labeling. We also compared the miRNA expression profiles of hMSCs transduced with the lentiviral vector pLV-EmGFP-MIRN335 with MSCs transduced with the control vector pLV-EmGFP-Mock. For the gene expression microarrays, a total of three independent samples were used for each condition.

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Gene expression in E9.5 trunks comparing wt with Arid3b-null embryos

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