Project description:This study evaluated transcriptional effects of nanomaterials that have been proposed for use as platforms for drug delivery. We tested SiO2 that had been surface modified to have a positive zetapotential of different geometries as well PAMAM dendrimers with different surface charges. We tested these materials on human aortic endothelial cells (HAECs) since we were interested in determining if there was a toxicogenomic response in endothelial cells that may come into contact with drug delivery nanoplatforms. The most pronounced transcriptional response resulted from the SiO2 treatement - the most prevelant responses were cell cycle, lipid metabolism and pro-inflammatory responses - with fewer responses from the PAMAM dendrimers. The lipid metabolism responses may relate to teh positive surface character as this response was not observed in the G3.5-COOH dendrimers. Indeed, the G3.5-COOH dendrimers were non-toxic and did not demonstrate any consistent transcriptional response. Primary human aortic endothial cells (HAECs) were grown in 6 well plates (in 2 ml of medium) until they were >80% confluent by visual inspection. Daily media changes allowed continued growth for HAECs that demonstrate contact inhibition. The cells were then incubated with nanomaterials: surface modified SiO2 with worm and sphere goemetries (the spheres were 200 nm in diameter and the worm's cylindrical diameter 200 nm and the length was ~ 1000 nm); and PAMAM dendrimers with different surface charges (G3.5-COOH are negative and G4-NH2 are positive). RNA was collected after 4 and 24 hrs (one SiO2 worm sample was at 1.5 hrs due to space available on the 4-pack microarrays). Triplicate biological samples (indicated by the 'a', 'b', and 'c' designations in the sample names) were evaluated for gene expression changes by microarray analysis.
Project description:This study evaluated transcriptional effects of nanomaterials that have been proposed for use as platforms for drug delivery. We tested SiO2 that had been surface modified to have a positive zetapotential of different geometries as well PAMAM dendrimers with different surface charges. We tested these materials on human aortic endothelial cells (HAECs) since we were interested in determining if there was a toxicogenomic response in endothelial cells that may come into contact with drug delivery nanoplatforms. The most pronounced transcriptional response resulted from the SiO2 treatement - the most prevelant responses were cell cycle, lipid metabolism and pro-inflammatory responses - with fewer responses from the PAMAM dendrimers. The lipid metabolism responses may relate to teh positive surface character as this response was not observed in the G3.5-COOH dendrimers. Indeed, the G3.5-COOH dendrimers were non-toxic and did not demonstrate any consistent transcriptional response.
Project description:Analysis of gene expression in primary cultured human aortic endothelial cells (HAECs) and primary cultured human aortic smooth muscle cells (SMCs) with or without H2O2 or Collagen tripeptide (CTP)
Project description:Super-selective intra-ophthalmic artery chemotherapy (SSIOAC) is an organ-specific drug-delivery strategy to treat retinoblastoma, the most common primary ocular malignancy in children. Unfortunately, recent clinical reports associate adverse vascular toxicities with SSIOAC using melphalan, the most commonly used chemotherapeutic. To explore the reason for the unexpected vascular toxicities, we have developed in vitro studies with human retinal endothelial cells to test the effects of the chemotherapeutics and a non-human primate model to monitor the SSIOAC treatment in real-time and post-treatment. Melphalan and carboplatin (another chemotherapeutic used to treat retinoblastoma via SSIOAC) triggered migration, proliferation, and apoptosis when used to treat human retinal endothelial cells. Melphalan was associated with increased adhesion of leukocytes to human retinal endothelial cells, and tended to increase with increased cell expression of adhesion proteins (ICAM-1) and soluble chemotactic factors (IL-8). Histopathology post-SSIOAC indicated vessel wall sloughing, leukostasis, and vessel occlusion. We have established an in vitro human cell culture model and a non-human primate model to evaluate strategies designed to obviate vascular side effects, and optimize the efficacy of SSIAOC and the drug preparations used in SSIOAC. 4 non-treated (CNT) vs. 4 carboplatin-treated primary human retinal endothelial cells (RECs).
Project description:Super-selective intra-ophthalmic artery chemotherapy (SSIOAC) is an organ-specific drug-delivery strategy to treat retinoblastoma, the most common primary ocular malignancy in children. Unfortunately, recent clinical reports associate adverse vascular toxicities with SSIOAC using melphalan, the most commonly used chemotherapeutic. To explore the reason for the unexpected vascular toxicities, we have developed in vitro studies with human retinal endothelial cells to test the effects of the chemotherapeutics and a non-human primate model to monitor the SSIOAC treatment in real-time and post-treatment. Melphalan and carboplatin (another chemotherapeutic used to treat retinoblastoma via SSIOAC) triggered migration, proliferation, and apoptosis when used to treat human retinal endothelial cells. Melphalan was associated with increased adhesion of leukocytes to human retinal endothelial cells, and tended to increase with increased cell expression of adhesion proteins (ICAM-1) and soluble chemotactic factors (IL-8). Histopathology post-SSIOAC indicated vessel wall sloughing, leukostasis, and vessel occlusion. We have established an in vitro human cell culture model and a non-human primate model to evaluate strategies designed to obviate vascular side effects, and optimize the efficacy of SSIAOC and the drug preparations used in SSIOAC. 4 non-treated (MNT) vs. 4 melphalan-treated primary human retinal endothelial cells (RECs).
Project description:Regulation of coding and non-coding genes is studied from primary human aortic endothelial cells (HAECs), venous endothelial cells (HUVECs), aortic smooth muscle cells (HASMCs) and macrophages (CD14+) under pro-atherogenic stimuli (hypoxia, oxPAPC and hypoxia+oxPAPC) by integrating three different sequencing techniques: GRO-seq, miRNA-seq and RNA-seq.
Project description:Regulation of coding and non-coding genes is studied from primary human aortic endothelial cells (HAECs), venous endothelial cells (HUVECs), aortic smooth muscle cells (HASMCs) and macrophages (CD14+) under pro-atherogenic stimuli (hypoxia, oxPAPC and hypoxia+oxPAPC) by integrating three different sequencing techinques: GRO-seq, miRNA-seq and RNA-seq
Project description:EVs were isolated from primary human aortic endothelial cells (ECs) (+/- IL-1b activation), quantified, and analysed by miRNA transcriptomics and proteomics.