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VEGF induction of HUVEC and CEP

ABSTRACT: Angiogenesis, the formation of new capillaries by sprouting from preexisting vessels, is mainly induced by VEGF-A. To identify genes which are induced by VEGF-A in endothelial cells and genes which are differently expressed or VEGF-A induced in HUVEC and CEP, HUVEC and CEP were starved and induced by VEGF-A165 for 30, 60 and 150min. RNA of induced and uninduced cells was isolated and subjected to microarray analysis using Affymetrix microarray.

ORGANISM(S): Homo sapiens

PROVIDER: GSE22695 | GEO | 2014/12/06

SECONDARY ACCESSION(S): PRJNA128305

REPOSITORIES: GEO

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VEGF induction of HUVEC

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Project description:Angiogenesis, the formation of new capillaries by sprouting from preexisting vessels, is mainly induced by VEGF-A. To identify genes which are induced by VEGF-A in endothelial cells, HUVEC were starved and induced by VEGF-A165 for 30, 60 and 150min. RNA of induced and uninduced cells was isolated and subjected to microarray analysis using Affymetrix microarray. Experiment Overall Design: Human umbilical vein endothelial cells were grown in complete EGM-2 medium in dense culture for four days without change of medium and before the stimulation in EGM-2 medium without growth factors over night. The cells were stimulated with 100ng/ml VEGF-A165 for 30, 60 and 150 min. RNA was isolated with Trizol according to the manufacturer's instructions.

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Project description:Rationale: Slit2 is a possible modulator of vascular endothelial growth factor (VEGF) - induced angiogenesis, but its effects have not been tested in large animal models. Objective: We studied the effect of Slit2 on therapeutic angiogenesis induced by VEGF receptor 2 (VEGFR2) ligands Vammin and VEGF-DΔNΔC in vivo in rabbit skeletal muscles. The Slit2 target genes were also studied by RNA sequencing (RNA-Seq) in endothelial cells. Methods and Results: Adenoviral intramuscular gene transfers were performed into rabbit hindlimbs. Confocal and multiphoton microscopy were used for blood vessel imaging. Signaling experiments and gene expression analyses were performed to study mechanisms of Slit2 action. Slit2 decreased VEGFR2-mediated vascular permeability. It also reduced VEGFR2-mediated increase in blood perfusion and capillary enlargement, whereas sprouting of the capillaries was increased. Slit2 gene transfer alone did not have any effects on vascular functions or morphology. VEGFR2 activation was not affected by Slit2, but eNOS phosphorylation was diminished. The transcriptome profiling showed Slit2 downregulating angiogenesis-related genes such as nuclear receptor subfamily 4 group A member 1 (NR4A1) and Stanniocalcin-1 (STC-1) as well as genes related to endothelial cell migration and vascular permeability. Conclusions: Combining Slit2 with VEGFs adjusts VEGFR2-mediated angiogenic effects into a more physiological direction. This possibly allows the use of higher VEGF vector doses to achieve a more widespread vector and VEGF distribution in the target tissues leading to a better therapeutic outcome while reducing excess vascular permeability. HUVEC mRNA profiles after adenoviral vector gene transfers in duplicate.

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Project description:VEGF induction of HUVEC and CEP

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