Oxidized-LDL, LOX-1 and angiogenesis

氧化 LDL、LOX-1 和血管生成

• 批准号: 8195621
• 负责人: JAWAHAR L MEHTA
• 金额: --
• 依托单位: CENTRAL ARKANSAS VETERANS HLTHCARE SYS
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8195621
• 关键词: Address; Antibodies; Apoptosis; Area; Arterial Fatty Streak; Arteries; Arts; Atherosclerosis; Binding; Biological Assay; Blood Vessels; Blood capillaries; CD36 gene; Cell Proliferation; Cells; Cessation of life; Cholesterol; Chronic; Coronary artery; Data; Development; Diabetes Mellitus; Diabetic Retinopathy; Dyslipidemias; Embryonic Development; Endothelial Cells; Event; Extracellular Matrix Degradation; Foam Cells; Functional disorder; Generations; Genes; Growth; Growth Factor; Human; Hydrogen Peroxide; Hypertension; Inflammatory; Ischemia; Knock-out; Knockout Mice; LDL Cholesterol Lipoproteins; LOX gene; Lead; Lectin; Lesion; Low-Density Lipoproteins; Malignant Neoplasms; Mediating; Microarray Analysis; Modeling; Molecular; Molecular Biology; Mus; Myocardial Infarction; Necrosis; Oxidation-Reduction; Oxidative Stress; Oxygen; Pathogenesis; Pathologic; Physiological; Physiological Processes; Play; Process; Reactive Oxygen Species; Research; Role; Signal Transduction; Signaling Molecule; Small Interfering RNA; Smoking; Superoxides; Testing; Tissues; Training; Tube; Up-Regulation; Vascular Endothelial Growth Factors; Work; Wound Healing; angiogenesis; atherogenesis; base; capillary; cardiovascular risk factor; cell injury; cell motility; design; experience; inhibitor/antagonist; low density lipoprotein inhibitor; macrophage; matrigel; member; migration; mouse model; neovasculature; novel; oxidized LDL receptors; oxidized low density lipoprotein; preconditioning; public health relevance; receptor; research study; response; scavenger receptor; uptake

Summary Angiogenesis, defined as formation of new blood vessels, is a physiological process necessary for embryonic development and wound repair. Angiogenesis is also an important component of various pathologic events such as tissue ischemia, cancer, diabetic retinopathy, and chronic inflammatory states including atherosclerosis. Among the key events leading to angiogenesis is generation of reactive oxygen species (ROS) such as superoxide anions and hydrogen peroxide which play a key role in physiological and pathophysiological states. LOX-1, a lectin-like ox-LDL receptor, is responsible for binding and uptake of ox-LDL in endothelial cells. It has been well documented that the activation of LOX-1 itself can stimulate the formation of ROS and initiate a cascade of redox-sensitive signaling events. We postulate that oxidized LDL (ox-LDL) at low concentrations activates LOX-1 in endothelial cells, induces low levels of ROS release and initiates the angiogenic response. Our specific aims in this proposal are: Aim # 1: To study the effect of oxidized LDL (ox-LDL) on angiogenesis- These studies will be done in human coronary artery endothelial cells, in an aortic ring model of angiogenesis, as well as in wild-type and LOX-1 knock out (KO) mice. Aim # 2: To define the mechanisms of ox-LDL-induced angiogenic response- These studies will involve a number of specific inhibitors, LOX-1 antibody, siRNA against LOX-1, and upregulation of LOX-1, and will involve state-of-art molecular biology approaches. Further, to define the mechanism of the effects of ox-LDL, microarray technology will be utilized to identify genes that are up-regulated and down-regulated during angiogenesis. The strengths of the proposal are: 1. The PI has strong background on angiogenesis and LOX-1 research. 2. The PI has LOX-1 KO mice in his possession. 3. Availability of well trained molecular biologist well-versed in most aspects of the research. 4. One of the PI's team members has extensive experience in microarray technology. Significance: Understanding of the basis of formation of neovasculature may provide novel information on the basis of atherogenesis, especially in the development of unstable lesions. Information gained from this study may also have relevance in the development of cancers which are dependent of neovasculature for their growth.

总结