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VEGF-C/VEGFR3 Regulation of VE-Cadherin in Sinusoidal Angiogenesis and Lymphangiogenesis

VEGF-C/VEGFR3 对 VE-钙粘蛋白在正弦血管生成和淋巴管生成中的调节

基本信息

批准号：
10563110
负责人：
Derek C Sung
金额：
$ 3.41万
依托单位：
UNIVERSITY OF PENNSYLVANIA
依托单位国家：
美国
项目类别：
财政年份：
2021
资助国家：
美国
起止时间：
2021-07-01 至 2023-06-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10563110
关键词：
Ablation Binding Blood Blood Vessels Bone Marrow Cell Culture Techniques Cells Cre lox recombination system Data Defect Development Discontinuous Capillary Edema Electrical Resistance Embryo Embryonic Development Endocytosis Endothelial Cells Endothelium Erythroid Fetal Liver Fluid Balance Genetic Goals Growth Growth and Development function Hematopoiesis Histologic Human Immunofluorescence Immunologic In Vitro KDR gene Knockout Mice Ligands Liver Liver Regeneration Lymphangiogenesis Lymphatic Lymphatic Diseases Lymphatic Endothelial Cells Measures Mediating Membrane Modeling Molecular Mus Organ Pathway interactions Permeability Pharmacology Phenocopy Phenotype Phosphorylation Process Regulation Research Role Signal Transduction Signaling Molecule Skin Small Interfering RNA Stains Testing Tissues VEGFA gene Vascular Endothelial Growth Factor C Vascular Endothelial Growth Factor Receptor-3 Vascular Endothelial Growth Factors Western Blotting Work angiogenesis beta-arrestin blood vessel development cadherin 5 cell growth gain of function improved in vivo inhibitor insight lymphatic malformations lymphatic vasculature novel reconstitution regenerative therapy therapeutic target vascular bed

项目摘要

Research Summary The blood, lymphatic, and sinusoidal vasculatures are molecularly and functionally distinct vascular networks whose normal growth and development are essential to support embryogenesis. While there has been notable effort to understand mechanisms of blood vessel development, relatively little is known about the role of vascular endothelial growth factor (VEGF) receptor 3 (VEGFR3) and its main ligand VEGF-C in sinusoidal development. Despite decades of work on VEGFR2 and VEGFR3 signaling, insights into the field have been complicated by use of various genetic and pharmacologic models with divergent phenotypes. Furthermore, VEGF-C can weakly bind and activate VEGFR2 in addition to inducing VEGFR2-VEGFR3 heterodimers. As a result, the role of VEGF-C in vascular development remains incompletely understood. Therefore, our goal is to determine the role of VEGF-C/VEGFR3 in vascular development and identify novel signaling mechanisms through which it functions through a combination of in vivo mouse and in vitro cell culture studies. We and others have previously identified VEGF-C as an important regulator of fetal liver hematopoiesis. This was primarily attributed to defects in erythroid maturation, however the sinusoids are the only VEGFR3-positive cells in the fetal liver. Strikingly, endothelial deletion of VEGFR3 and vascular endothelial (VE-)cadherin gain- of-function mice both phenocopy VEGF-C knockout mice, suggesting that diminished fetal liver hematopoiesis is in fact due to sinusoidal defects. These mice also have decreased bone marrow (BM) sinusoids. BM defects due to endothelial loss of VEGFR3 are rescued by VE-cadherin haploinsufficiency, demonstrating that VEGFR3 negatively regulates VE-cadherin to promote sinusoidal growth. Whether this process depends on VEGF-C and the signaling mechanisms through which VEGFR3 regulates VE-cadherin remain unclear. Therefore, I hypothesize that VEGF-C activates VEGFR3 to directly and negatively regulate VE-cadherin during sinusoidal angiogenesis and lymphangiogenesis. Aim 1 will test whether haploinsufficiency of VE- cadherin can rescue fetal liver and lymphatic growth defects, as I have demonstrated to be true in the bone marrow sinusoids. Aim 2 will test whether VEGFR3 functions in a VEGF-C-dependent or independent manner in the skin, liver, and bone marrow during sinusoidal angiogenesis and lymphangiogenesis. Finally, Aim 3 will determine the mechanism by which VEGFR3 negatively regulates VE-cadherin through in vitro studies using human lymphatic endothelial cells. Together, these studies will bring novel insights into the mechanism by which VEGF-C/VEGFR3 may regulate VE-cadherin across various vascular beds in multiple organs, which could have important implications for liver regeneration, BM reconstitution, and lymphatic disorders.

研究总结