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LOCALIZATION OF VEGF AND VEGF-RECEPTORS USING GOLD-CONJUGATED DNA APTAMERS

使用金缀合 DNA 适体定位 VEGF 和 VEGF 受体

基本信息

批准号：
8170852
负责人：
Bruce Eaton
金额：
$ 4.98万
依托单位：
UNIVERSITY OF COLORADO
依托单位国家：
美国
项目类别：
财政年份：
2010
资助国家：
美国
起止时间：
2010-05-01 至 2011-04-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/8170852
关键词：
Affinity Binding Biological Phenomena Blood Vessels Cell surface Complex Computer Retrieval of Information on Scientific Projects Database DNA Dimerization Electron Microscopy Electrons Endothelial Cells Family Funding Glycoproteins Goals Gold Grant Growth Factor Receptors Hypoxia Image Institution Label Ligands Malignant neoplasm of lung Membrane Neuropilin-1 Oxygen Physiological Processes Protein Isoforms Proteins Receptor Protein-Tyrosine Kinases Research Research Personnel Resources Signal Transduction Source Techniques United States National Institutes of Health Vascular Endothelial Growth Factor Receptor Vascular Endothelial Growth Factor Receptor-1 Vascular Endothelial Growth Factor Receptor-2 Vascular Endothelial Growth Factors Vascular Permeabilities angiogenesis aptamer cancer cell nanoparticle particle receptor response tumor growth

项目摘要

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Vascular Endothelial Growth Factor (VEGF) is a secreted dimeric glycoprotein that regulates the formation of new blood vessels from existing vessels, a physiological process often referred to as angiogenesis. VEGF enhances vascular permeability through an intracellular signaling cascade that is initiated after ligand induced dimerization of two structurally related receptor tyrosine kinases (RTKs), VEGFR-1 and VEGFR-2. VEGFR-2 dependent signaling conveys a stronger angiogenic response and is observed to a greater degree during pathological tumor growth or when endothelial cells (ECs) are starved of oxygen under hypoxic conditions. 1 Signaling is enhanced by Neuropilin-1 (Nrp-1), which acts as a co-receptor at the cell surface when the activated VEGF/VEGFR complex assembles. The goal of this project is to image lung cancer cells which express different VEGF isoforms and VEGF receptors in complex with their known membrane binding partners using electron microscopy. A panel of pre-selected SomaLogic dsDNA aptamers will be conjugated to 2 nm, 5 nm or 10 nm gold particles in order to biofunctionalize the nanoparticle and provide a small electron dense tag that will enable us to locate the VEGFs/VEGFRs on the cell surface. We hope to show colocalization of known protein factors that are part of an active signaling complex in order to better understand the spatial display of this family of growth factors/receptors at the cell surface. If proven to be effective, this technique could be applied to a host of other biological phenomena. Because of the small size (50-70 bp) and high affinity (Kds ~1-10 nM) of the aptamers, we think this labeling approach will be better than immunolabeling, which often requires two labeling steps with primary and secondar! y antibodie

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