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RNAseq analysis of Angiotensin II perfused Apolipoprotein E deficient mice reconstituted with Wild Type or Netrin-1 deficient hematopoietic stem cells

ABSTRACT: RNAseq analysis of Angiotensin II perfused Apolipoprotein E deficient mice reconstituted with Wild Type or Netrin-1 deficient hematopoietic stem cells

PROVIDER: PRJNA484935 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7655450.fastq.gz	Fastqsanger.gz
	SRR7655460.fastq.gz	Fastqsanger.gz
	SRR7655451.fastq.gz	Fastqsanger.gz
	SRR7655461.fastq.gz	Fastqsanger.gz
	SRR7655452.fastq.gz	Fastqsanger.gz

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RNAseq analysis of Angiotensin II perfused Apolipoprotein E deficient mice reconstituted with Wild Type or Netrin-1 deficient hematopoietic stem cells

Project description:We report the transcriptomic analysis of RNA-seq of aortas isolated from WT ApoE-/- and Ntn1-/- ApoE-/- mice exposed to Ang II to uncover the mechanisms underlying the undefined role netrin-1 in AAA

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Microarray gene expression profiling of heart failure induced in apolipoprotein E-deficient mice by treatment with rosiglitazone

Project description:The anti-diabetic drug and agonist of the peroxisome proliferator-activated receptor gamma (Pparg), rosiglitazone, was recently withdrawn in many countries because the drug use was associated with an increased risk of heart failure. To investigate underlying pathomechanisms, we chose 6-month-old apolipoprotein E (apoE)-deficient mice, which are prone to atherosclerosis and insulin resistance, and thereby mimic the risk profile of patients with cardiovascular disease. After 8 weeks of rosiglitazone treatment (30 mg/kg/day), echocardiography and histology analyses demonstrated that rosiglitazone had induced heart failure with cardiac dilation. Concomitantly, cardiac lipid overload and lipid-induced cardiomyocyte death developed. The microarray gene expression study of heart tissue from rosiglitazone-treated apoE-deficient mice relative to untreated apoE-deficient mice and non-transgenic B6 mice identified cardiac Pparg-dependent lipid metabolism genes in rosiglitazone-treated mice, which seem to trigger a major heart failure promoting pathway. Microarray gene expression profiling was performed with heart tissue isolated from three study groups: (i) rosiglitazone-treated 8-month-old apolipoprotein (apoE)-deficient mice with symptoms of heart failure, (ii) untreated 8-month-old apoE-deficient mice, and (iii) age-matched, untreated, non-transgenic B6 control mice.

2011-03-18 | E-GEOD-28031 | biostudies-arrayexpress

A Floor Plate Extracellular Protein-Protein Interaction Screen Identifies Draxin as a Secreted Netrin-1 Antagonist

Project description:Floor plate-derived extracellular signaling molecules, including canonical axon guidance cues of the Netrin family, control neuronal circuit organization. Despite the importance of the floor plate as an essential signaling centre in the developing vertebrate central nervous system, no systematic approach to identify binding partners for floor plate-expressed cellsurface and secreted proteins has been carried out. Here, we used a high-throughput assay to discover extracellular protein-protein interactions, which likely take place in the zebrafish floor plate microenvironment. The assembled floor plate network contains 47 interactions including the hitherto not reported interaction between Netrin-1 and Draxin. We further characterized this interaction, narrowed down the binding interface, and demonstrated that Draxin competes with Netrin receptors for binding to Netrin-1. Our results suggest that Draxin functions as an extracellular Netrin signaling modulator in vertebrates. A reciprocal gradient of Draxin might shape or sharpen the active Netrin gradient, thereby critically modulating its effect.

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Project description:The generation of induced pluripotent stem (iPS) cells holds great promise in regenerative medicine. However, the relative flaws in the understanding of the molecular mechanisms promoting or limiting reprogramming still hinder the efficient generation of high quality iPS cells. Whereas modulation of the initial Oct4, Sox2, Klf4 and c-Myc (OSKM) cocktail with new transcription factors has been extensively documented, comparatively little is known about soluble molecules promoting the process, even if such recombinant factors could be highly valuable for therapeutic applications. In this study we developed a large-scale identification method to uncover novel programmed cell death (PCD)-related mechanisms limiting somatic cell reprogramming to pluripotency (SCRP). We identified Netrin-1 and its dependence receptor Dcc (Deleted in Colorectal Carcinoma), previously described for their respective survival/death functions both in normal and oncogenic contexts, as novel key SCRP modulators. We show that the early phase of SCRP is accompanied with a strong Netrin-1 deficiency, due to the improper epigenetic regulation of the Ntn1 promoter by OSKM. Mechanistically, we demonstrate that such Netrin-1 imbalance induces apoptosis mediated by the dependence receptor Dcc in a p53-independent manner. Correction of the Netrin-1/Dcc equilibrium by gain-of-ligand and loss-of-receptor experiments constrains apoptosis and improves reprogramming. As a consequence, we propose a novel iPS derivation protocol including a sequential treatment with recombinant Netrin1 that greatly facilitates the generation of mouse and human iPS cells. RNA-sequencing of mouse embryonic fibroblasts (passage 2 and passage 4), mouse pre-iPS cells (passage 5 and passage 25), 1 clone of control iPS (passage 5 and passage 25) and 2 independent clones of "Netrin-1 derived" iPS cells (passage 5 and passage 25). For this analysis, mouse iPS cell lines were grown in KSR+LIF media.

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