Oxidant stress and diabetic endothelial dysfunction

氧化应激与糖尿病内皮功能障碍

• 批准号: 8064800
• 负责人: MING-HUI ZOU
• 金额: $ 36.63万
• 依托单位: UNIVERSITY OF OKLAHOMA HLTH SCIENCES CTR
• 依托单位国家: 美国
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2014-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8064800
• 关键词: 26S proteasome; 3-nitrotyrosine; 5' -AMP-activated protein kinase; AMP-activated protein kinase kinase; Abbreviations; Affect; Animals; Antioxidants; Aorta; Atherosclerosis; Binding; Blood Vessels; Cardiovascular Diseases; Cell Adhesion Molecules; Cell Nucleus; Cells; Chemicals; Chronic; Complex; Coupled; Data; Development; Diabetes Mellitus; Diabetic mouse; Dominant-Negative Mutation; Endothelial Cells; Endothelium; Free Radicals; Functional disorder; Genetic; Glucose; Goals; Human; Hydrogen Peroxide; Hyperglycemia; Hypertension; Inflammation; Injury; Ischemic Preconditioning; Knock-out; Knockout Mice; Lesion; Link; Low Density Lipoprotein Receptor; MG132; Mass Spectrum Analysis; Mediating; Metabolic stress; Metformin; Modification; Molecular; Mus; NG-Nitroarginine Methyl Ester; Nitric Oxide; Nonesterified Fatty Acids; Nuclear Translocation; Oxidants; Oxidases; Oxidation-Reduction; Oxidative Stress; Pathogenesis; Patients; Peptide Mapping; Peroxonitrite; Polyethylene Glycols; Production; Prostacyclin synthase; Prostaglandins; Proteasome Inhibition; Proteasome Inhibitor; Protein Kinase C; Proteins; Publishing; Reaction; Reactive Nitrogen Species; Reactive Oxygen Species; Recombinants; Resistance; Role; Small Interfering RNA; Streptozocin; Stress; Superoxide Dismutase; Superoxides; TNFRSF5 gene; Testing; Transactivation; Transgenic Mice; Tyrosine; UCP2 protein; Uric Acid; activity marker; arginine methyl ester; atherogenesis; clinically relevant; design; diabetic; human NOS3 protein; in vivo; insight; mouse model; multicatalytic endopeptidase complex; mutant; neutrophil cytosol factor 67K; nitration; novel; overexpression; oxidant stress; p65; polyethylene glycol-superoxide dismutase; prevent; promoter; public health relevance; research study; sensor; tempol

DESCRIPTION (provided by applicant): Our published data and the preliminary data presented in this application have demonstrated that hyperglycemia suppresses AMPK, which in turn perpetuates oxidative stress and vascular injury in diabetes. The central hypothesis of this application is that AMPK12 inhibition increases 26S activity, which increases I:B1 degradation, p65 nucleus localization, and consequent NF:B activation. Activated NF:B binds to the promoter of NAD(P)H oxidase subunits, including NOX4, gp91phox(NOX2), p67phox, p47phox, resulting in an increase in NAD(P)H oxidase activity and ROS, which causes endothelial cell dysfunction and accelerated atherosclerosis. Chronic proteasome inhibition of the 26S proteasome prevents endothelial dysfunction and atherogenesis by inhibiting proteasome-dependent NF:B-mediated activation of NAD(P)H oxidase. This hypothesis will be tested in three interrelated aims. These first two aims are designed to establish whether chronic hyperglycemia inhibition AMPK functions (Aim #1) and whether AMPK inhibition causes abnormal expression of adhesion molecules and oxidant stress in diabetes (Aim #2). Finally, we will test the contributions of RNS-mediated AMPK inhibition in the development of accelerated atherosclerosis in diabetes (Aim #3). Although the in vivo relationships among atherosclerosis, oxidant stress, and AMPK in diabetes are undoubtedly complex, the emerging role for AMPK in oxidant stress and atherosclerosis warrant further study. The studies proposed here represent the first set of definitive studies to determine the role of ONOO- and AMPK inhibition in the pathogenesis of diabetic vascular dysfunction and atherosclerosis. As such, they have the potential to explain the long recognized decrease in AMPK that occurs in animals and human patients with diabetes. We believe that the proposed studies will provide novel information as to how the metabolic stress associated with diabetes causes damage to the endothelium and how the endothelial cell attempts to protect itself against these stresses and whether ONOO- or AMPK are potential targets for therapy. PUBLIC HEALTH RELEVANCE: Recent studies from the applicant's group and others support the idea that oxidant stress is a common pathogenic mechanism for cardiovascular diseases including diabetes, hypertension, and atherosclerosis. But the mechanisms are poorly defined. Thus, this application is aimed to determine 1) how diabetes inhibits AMPK in endothelial cells; 2) To determine how AMPK inhibition results in excessive inflammation and oxidant stress; and 3) to determine the contribution of AMPK inhibition in diabetes-enhanced atherosclerosis in mouse models of atherosclerosis in vivo.

描述（由申请人提供）：我们公布的数据和本申请中提供的初步数据表明，高血糖抑制AMPK，而AMPK反过来又使糖尿病的氧化应激和血管损伤持续存在。该应用的中心假设是AMPK12抑制增加26S活性，从而增加I:B1降解、p65核定位以及随后的NF:B激活。活化的NF:B与NAD(P)H氧化酶亚基启动子结合，包括NOX4、gp91phox（NOX2）、p67phox、p47phox，导致NAD(P)H氧化酶活性和ROS升高，导致内皮细胞功能障碍，加速动脉粥样硬化。慢性蛋白酶体抑制26S蛋白酶体通过抑制蛋白酶体依赖的NF: b介导的NAD(P)H氧化酶的激活来预防内皮功能障碍和动脉粥样硬化。这一假设将在三个相互关联的目标中得到检验。前两个目的旨在确定慢性高血糖抑制AMPK是否起作用（Aim #1），以及AMPK抑制是否导致糖尿病中粘附分子的异常表达和氧化应激（Aim #2）。最后，我们将测试rns介导的AMPK抑制在糖尿病加速动脉粥样硬化发展中的作用（目的#3）。虽然糖尿病患者体内动脉粥样硬化、氧化应激和AMPK之间的关系无疑是复杂的，但AMPK在氧化应激和动脉粥样硬化中的新作用值得进一步研究。本文提出的研究是确定ONOO-和AMPK抑制在糖尿病血管功能障碍和动脉粥样硬化发病机制中的作用的第一组明确研究。因此，它们有可能解释长期以来在动物和人类糖尿病患者中发生的AMPK下降。我们相信，这些研究将为糖尿病相关的代谢应激如何导致内皮细胞损伤，内皮细胞如何试图保护自己免受这些应激，以及ONOO-或AMPK是否是潜在的治疗靶点提供新的信息。