Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of mouse wildtype and Rb-/- fetal liver at e12.5

ABSTRACT: Rb null embryos exhibit defective fetal liver erythropoiesis. We used microarrays to compare Wt and Rb null fetal livers and to analyse gene expression differences which accompany and may underlie Rb null fetal liver degeneration, erythroid failure, and erythropoietic island dissolution. We used microarrays to compare Wt and Rb null fetal livers and analyse gene expression changes which accompany and may underlie fetal liver. Experiment Overall Design: Wild type and Rb null embryos were sacrificed at e12.5 and fetal livers were dissected for RNA extraction. Three embryos of each genotype were analysed.

ORGANISM(S): Mus musculus

SUBMITTER: Kay Macleod

PROVIDER: E-GEOD-6787 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Hypoxic stress underlies defects in erythroblast islands in the Rb-null mouse.

Spike Benjamin T BT Dibling Benjamin C BC Macleod Kay F KF

Blood 20070608 6

Definitive erythropoiesis occurs in islands composed of a central macrophage in contact with differentiating erythroblasts. Erythroid maturation including enucleation can also occur in the absence of macrophages both in vivo and in vitro. We reported previously that loss of Rb induces cell-autonomous defects in red cell maturation under stress conditions, while other reports have suggested that the failure of Rb-null erythroblasts to enucleate is due to defects in associated macrophages. Here we ...[more]

PMID: 17557897

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Project description:The liver is a major site for synthesis, storage and redistribution of carbohydrates, proteins and lipids. In addition, it is well-known that maternal obesity (MO) increases risk of offspring cardiovascular disease (CVD), diabetes and obesity. However, the mechanisms by which the MO intrauterine environment predisposes offspring to CVD and metabolic dysregulation are unknown. The goal of this study was to assess the impact of MO on primate fetal liver and identify underlying molecular mechanisms by which MO increases disease risk. The goal of this study was to identify candidate molecular mechanisms underlying MO in the near-term NHP fetal liver. This is the first study of NHP fetal MO livers using unbiased transcriptome analysis to quantify hepatic gene expression, identify dysregulated signaling pathways and potential miRNAs regulating the disrupted metabolic processes. Unbiased gene (arrays) and microRNA (miRNA; small RNA-Seq) abundances were quantified in near-term (0.9 Gestation (0.9G)) baboon fetal livers (control (CON) = 6; MO = 5) and subjected to pathway and network analyses (GeneSifter, Ingenuity® Pathway Analysis (IPA)) to identify a coordinated molecular response to MO. Lipid and glycogen content (CON = 16; MO = 16) were quantified by Computer Assisted Stereology Toolbox (CAST) in 0.9G livers.Pairwise comparisons showed 933 differentially expressed genes between CON and MO livers: 350 genes were upregulated and 583 were downregulated. Pathway analysis revealed upregulation of Wnt/β-catenin signaling and downregulation of tricarboxylic acid (TCA) cycle, proteasome, oxidative phosphorylation and glycolysis pathways in MO fetal livers compared with CON. Inversely expressed miRNAs that target genes in these pathways provide additional support for the importance of these pathways in fetal liver metabolic regulation. Consistent with the observed pathway changes in MO, we found hepatic lipid content was threefold greater in MO than CON fetal livers (p=0.02). Molecular genetic analyses of CON and MO fetal baboon livers revealed dysregulation of Wnt/β-catenin signaling, TCA cycle, proteasome, oxidative phosphorylation and glycolysis pathways in MO livers, all of which are central to fatty acid metabolism and lipid storage. The marked lipid accumulation in MO fetal livers supports our hypothesis that dysregulation of these pathways detrimentally impacts lipid management. Furthermore, our findings demonstrate the detrimental impact of MO on fetal liver development and suggest impaired hepatic function prior to birth.

Dataset Information

Transcription profiling of mouse wildtype and Rb-/- fetal liver at e12.5

Publications

Hypoxic stress underlies defects in erythroblast islands in the Rb-null mouse.

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