Expression of human aortic endothelial cells treated with or without oxidized phospholipids (II)
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE30169 | GEO | 2011/07/20
SECONDARY ACCESSION(S): PRJNA143911
REPOSITORIES: GEO
Similar Datasets
Project description:Oxidized phospoholipids are a pro-inflammatory component of minimally modified lipoproteins that get trapped in the subendothelial space of atherosclerotic plaques of large arteries. To model the response of endothelial cells in a pro-atherosclerotic enviroment we measured the expression in primary endothelial cells with and without treatment with oxidized phsopolipids from 96 genetically identical donors of anonymous origin.
2010-03-03 | GSE20060 | GEO
Project description:Oxidized phospoholipids are a pro-inflammatory component of minimally modified lipoproteins that get trapped in the subendothelial space of atherosclerotic plaques of large arteries. To model the response of endothelial cells in a pro-atherosclerotic enviroment we measured the expression in primary endothelial cells with and without treatment with oxidized phsopolipids from 96 genetically identical donors of anonymous origin. These samples are an extention of samples of similar origin deposited in GSE20060 Primary human aortic endothelial cells were collected from aortic heart explants of heart transplant donors and cultured in standard cell culture condiditions. At confluence, cells were treated with or without 40 ug/ml oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphatidylcholine (Ox-PAPC) for 4 hours in media 199 containing 1% fetal bovine serum. After 4 hours, the cells were collected for RNA extraction and quantification of transcripts via microarrays. Application of electronic probe mask (HT_U133Amsk.cdf) on raw data.
2011-07-19 | E-GEOD-30169 | biostudies-arrayexpress
Project description:Oxidized phospholipids (OxPL) are pro-inflammatory and pro-atherogenic, but their roles in non-alcoholic steatohepatitis (NASH) are unknown. Here, we show that OxPL accumulate in human and murine NASH. Using a transgenic mouse that expresses a functional single chain variable fragment of E06, a natural antibody that neutralizes OxPL, we demonstrate the casual role of OxPL in NASH. Targeting OxPL in hyperlipidemic Ldlr-/- mice decreased multiple aspects of NASH, including steatosis, inflammation, fibrosis, hepatocyte death and progression to hepatocellular carcinoma. Mechanistically, we found that OxPL promote ROS accumulation to induce mitochondrial dysfunction in hepatocytes. Neutralizing OxPL in AMLN diet-fed Ldlr-/- mice reduced oxidative stress, improved hepatic and adipose tissue mitochondrial function and fatty acid oxidation. Since neutralizing OxPL also protects against atherogenesis, targeting OxPL may be an effective therapeutic strategy for both NASH and atherosclerosis.
2019-11-04 | GSE138419 | GEO
Project description:Neutralization of Oxidized Phospholipids Restrains Nonalcoholic Steatohepatitis
| PRJNA575823 | ENA
Project description:The transition of the endothelium to a pro-inflammatory state is key to progression of chronic inflammatory diseases including rheumatoid arthritis, chronic bowel disease and atherosclerosis. In atherosclerosis it is hypothesized that low density lipoproteins (LDL) that become trapped in the intima of the blood vessels are oxidized to minimally modified LDL (mmLDL) and that these serve as an important contributing factors to endothelial dysfunction. Oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphatidylcholine (OX-PAPC), a model of the active phospholipid components of mmLDL affects the expression of hundreds of genes involved in inflammatory and other biological processes in human aortic endothelial cells (HAECs). We hypothesized that microRNAs (miRNAs) partially regulate this response. Using next generation sequencing, we identified miR-21-3p and miR-27a-5p to be induced 4-fold and 3-fold, respectively in response to OX-PAPC treatment compared to control treatment in HAECs. To identify the targets, we performed whole genome transcript profiling following transient over-expression of these two miRNAs followed by. In total, 1254 genes were down-regulated with 925 of them overlapping between the two miRNAs. Functional enrichment analysis using Gene Ontology predicted that the two miRNAs were involved in the regulation of NF-κB signaling. We characterized the Toll/interleukin-1 receptor (TIR) domain-containing adaptor protein TICAM2 as a direct target of miR-21-3p and miR-27a-5p. Furthermore, we showed that over-expression of miR-21-3p and miR-27a-5p lead to decreased p65 translocation to the nucleus and decreased the expression of known NF-κB downstream target genes confirming both miRNAs’ role in negatively regulating NF-κB signaling in endothelial cells. mRNA expression profiling of human aortic endothelial cells from two separate donors that were transfected with 1 nM microRNA mimics and negative control. The miRIDIAN mimics used were miR-21-3p (Catalog Number:C-301023-01-0005), miR-27a-5p (Catalog No: C-301028-01-0005), negative control (Catalog No: CN-001000-01-05)
2014-06-01 | E-GEOD-48006 | biostudies-arrayexpress
Project description:The transition of the endothelium to a pro-inflammatory state is key to progression of chronic inflammatory diseases including rheumatoid arthritis, chronic bowel disease and atherosclerosis. In atherosclerosis it is hypothesized that low density lipoproteins (LDL) that become trapped in the intima of the blood vessels are oxidized to minimally modified LDL (mmLDL) and that these serve as an important contributing factors to endothelial dysfunction. Oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphatidylcholine (OX-PAPC), a model of the active phospholipid components of mmLDL affects the expression of hundreds of genes involved in inflammatory and other biological processes in human aortic endothelial cells (HAECs). We hypothesized that microRNAs (miRNAs) partially regulate this response. Using next generation sequencing, we identified miR-21-3p and miR-27a-5p to be induced 4-fold and 3-fold, respectively in response to OX-PAPC treatment compared to control treatment in HAECs. To identify the targets, we performed whole genome transcript profiling following transient over-expression of these two miRNAs followed by. In total, 1254 genes were down-regulated with 925 of them overlapping between the two miRNAs. Functional enrichment analysis using Gene Ontology predicted that the two miRNAs were involved in the regulation of NF-κB signaling. We characterized the Toll/interleukin-1 receptor (TIR) domain-containing adaptor protein TICAM2 as a direct target of miR-21-3p and miR-27a-5p. Furthermore, we showed that over-expression of miR-21-3p and miR-27a-5p lead to decreased p65 translocation to the nucleus and decreased the expression of known NF-κB downstream target genes confirming both miRNAs’ role in negatively regulating NF-κB signaling in endothelial cells.
2014-06-01 | GSE48006 | GEO
Project description:Phosphoproteomic analysis of platelets activated by pro-thrombotic oxidized phospholipids and thrombin Alejandro Zimman, Bjoern Titz, Evangelia Komisopoulou, Sudipta Biswas, Thomas G. Graeber, and Eugene A. Podrez ABSTRACT Specific oxidized phospholipids (oxPCCD36) promote platelet hyper-reactivity and thrombosis in hyperlipidemia via the scavenger receptor CD36, however the signaling pathway(s) induced in platelets by oxPCCD36 are not well defined. We have now employed mass spectrometry-based tyrosine, serine, and threonine global phosphoproteomics for the unbiased analysis of platelet signaling pathways induced by oxPCCD36 as well as by the strong physiological agonist thrombin. oxPCCD36 and thrombin induced differential phosphorylation of 115 proteins (162 phosphorylation sites) and 181 proteins (334 phosphorylation sites) respectively. Most of the phosphoproteome changes induced by either agonist have never been reported in platelets; thus they provide a new resource to study platelet signaling. Bioinformatic analyses of protein phosphorylation dependent responses were used to categorize preferential motifs for (de)phosphorylation, predict pathways and kinase activity, and construct a phosphoproteome network regulating integrin activation. A putative signaling pathway involving Src-family kinases, SYK, and PLCy2 was identified in platelets activated by oxPCCD36. Subsequent ex vivo studies in human platelets demonstrated that this pathway is downstream of the scavenger receptor CD36 and is critical for platelet activation by oxPCCD36. Our results provide multiple novel insights into the mechanism of platelet activation and specifically in platelet regulation by oxPCCD36. Methods Human platelets isolated by gel filtration (2.7 x 108 / mL) were incubated in Tyrode's buffer with 50 uM KODA-PC or PLPC (as control) for 30 min at 37 degrees C. Platelets were then centrifuged at 3,700 g (10 min, 35 degrees C) and lysed in 8 M urea, 50 mM Tris-HCl (pH 7.4), 1 mM Na3VO4, and 1 mM NaF with sonication. Phosphoproteome changes induced by the agonists were assessed based on trypsin digestion of the protein lysate, phosphopeptide enrichment, mass spectrometry analysis, chromatography alignment, and label-free quantitation as described in the Supplemental Materials and Methods of the publication. The same protocol was applied when studying platelet activation by thrombin, where gel-filtered platelets were incubated in Tyrode's buffer with 0.05 U/mL thrombin or in buffer alone (Resting) for 3 min at 37 degrees C.
2013-12-02 | PXD000451 | Pride
Project description:Purpose: Endothelial cells respond to changes in subendothelial stiffness altering their proliferation, migration and barrier integrity but whether that is due to transcriptional reprogramming was largely unknown. Using RNA-Sequencing, we performed gene expression profiling for two endothelial cell types grown on soft or stiff matrices: primary human umbilical vein endothelial cells (HUVEC) and immortalized human microvascular endothelial cells (HMEC-1), to understand whether subendothelial stiffness-dependent changes in endothelial cell mechanics are due to transcriptional regulation. Methods and Results: By analyzing the differentially expressed genes between all samples we found that endothelial cell type rather that subendothelial stiffness is the primary determinant of the endothelial cell transcriptome. Both cell types respond to changes in their subendothelial stiffness by increasing the traction stresses they exert on stiffer as opposed to softer matrices, however it is apparently not the endothelial cell transcriptome that regulates this universal biomechanical response to subendothelial stiffness. Only a handful of genes were differentially expressed in each cell type in a stiffness-dependent manner, and none were shared between the two cell types examined. In contrast, thousands of genes were differentially regulated in HUVEC as compared to HMEC-1. HUVEC (but not HMEC-1) upregulate expression of TGF-2 on stiffer matrices, and also enhance their endogenous TGF-2 expression and their cell-matrix traction stresses in response to application of exogenous TGF-2. Conclusions: Altogether, these findings provide insights into the relationship between subendothelial stiffness, endothelial mechanics and variation of the transcriptome between distinct endothelial cell types, and reveal that subendothelial stiffness while critically impacting endothelial cell mechanics is minimally altering their transcriptome.
2019-07-31 | GSE135123 | GEO
Project description:Autoantibodies against nucleic acids and excessive type I Interferon (IFN) are hallmarks of human Systemic Lupus Erythematosus (SLE). We previously reported that SLE neutrophils, exposed to TLR7-agonist autoantibodies, release interferogenic DNA, which we now demonstrate to be of mitochondrial origin. We further show that healthy human neutrophils do not complete mitophagy upon induction of mitochondrial damage. Rather, they extrude mitochondrial components, including DNA (mtDNA), devoid of oxidized residues. When MtDNA undergoes oxidation, it is directly routed to lysosomes for degradation. This rerouting requires dissociation from the transcription factor TFAM, a dual high mobility group (HMG) protein involved in maintenance and compaction of the mitochondrial genome into nucleoids. Exposure of SLE neutrophils, or healthy IFNprimed neutrophils, to anti-RNP autoantibodies blocks TFAM phosphorylation, a necessary step for nucleoid dissociation. Consequently, oxidized nucleoids accumulate within mitochondria and are eventually extruded as potent interferogenic complexes. In support of the in vivo relevance of this phenomenon, mitochondrial retention of oxidized nucleoids is a feature of SLE blood neutrophils, and autoantibodies against oxidized mtDNA are present in a fraction of patients. This pathway represents a novel therapeutic target in human SLE. 4 samples, no replicates, 2 controls. 2 samples are Neutrophils cultured with and without CCCP (control). 2 samples are Monocytes cultured with and without CCCP (control).
2016-04-07 | E-GEOD-78243 | biostudies-arrayexpress
Project description:Oxidized 5mC modifications in fungi
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