Regulation of Endothelial Lipid Metabolism in the Setting of Diabetes and Critical Limb Ischemia to Prevent Surgical Complications

糖尿病和严重肢体缺血时调节内皮脂质代谢以预防手术并发症

• 批准号: 10586058
• 负责人: Mohamed A. Zayed
• 金额: $ 52.55万
• 依托单位: WASHINGTON UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10586058
• 关键词: Acceleration; Adoption; Adult; Affect; Agonist; Amputation; Arterial Intimas; Arterial Occlusive Diseases; Atherosclerosis; Biochemical; Biochemical Process; Blood Vessels; Cardiac; Cell physiology; Choline; Chronic Disease; Clinical; Clinical Data; Clinical Management; Clinical Trials; Complement; Data; Diabetes Mellitus; Diet; Diffuse Pattern; Disease; Disease Progression; Endothelial Cells; Endothelium; Enzymes; Ethanolamines; Event; FASN gene; Fatty Acids; Fatty-acid synthase; Fenofibrate; Financial Hardship; Functional disorder; Future; Genes; Health; Homeostasis; Individual; Insulin Resistance; Intervention; Intervention Studies; Investigation; Isolated limb perfusion; Knock-out; Knowledge; Lipid Synthesis Pathway; Lipids; Low-Density Lipoproteins; Lower Extremity; Mediating; Membrane; Metabolic; Molecular; Morbidity - disease rate; Mus; Operative Surgical Procedures; Organ; Outcome; PPAR alpha; Patients; Peripheral; Peripheral arterial disease; Persons; Pharmaceutical Preparations; Phospholipids; Phosphotransferases; Play; Post-Translational Protein Processing; Prevalence; Prevention strategy; Process; Protocols documentation; Reagent; Regulation; Research; Risk; Role; Serum; Signal Transduction; Smooth Muscle Myocytes; Surgical Management; Surgical complication; System; Techniques; Testing; Tissues; Triglycerides; United States; base; burden of illness; cell type; conditional knockout; cost; critical limb Ischemia; diabetes pathogenesis; double-blind placebo controlled trial; effective therapy; high risk; improved; individualized medicine; innovation; insight; lipid biosynthesis; lipid metabolism; mouse model; novel; pharmacologic; prevent; psychologic; revascularization surgery; targeted treatment; translational potential; treatment strategy

PROJECT ABSTRACT Background & Significance: Peripheral arterial disease (PAD) affects 12 million people in the US (1 in 27 individuals). Individuals with diabetes are nearly 10 times more likely to develop end-stage surgical complications such as critical limb ischemia (CLI) and major lower extremity amputation. This leads to significant health, psychological, and financial burdens on surgical patients with diabetes. Therefore, it is paramount to better understand this chronic disease process in order to develop more effective treatment strategies, and improve the health of these patients. Fenofibrate, a peroxisome proliferator activated receptor alpha (PPARα) agonist that lowers serum triglycerides, is the only medication to date shown to reduce peripheral amputation rates in patients with diabetes. However, it is unknown how Fenofibrate confers this benefit, and therefore it is seldom used in the clinical management of surgical patients with diabetes and CLI who are at risk of amputation. De novo lipogenesis is a multi-step lipid synthesis pathway that is known to contribute to the pathogenesis of diabetes in non-vascular organ tissue, and is regulated by fatty acid synthase (FAS) and choline/ethanolamine phosphotransferase-1 (CEPT1). Interplay between these enzymes can lead to activation of PPARα-mediated signaling. It is unknown whether Fenofibrate can impact de novo lipogenesis, endothelial cell (EC) lipid metabolism, and peripheral arterial atheroprogression in the setting of diabetes. Preliminary Data: We observed that Fenofibrate can indeed affect peripheral limb perfusion in the setting of altered de novo lipogenesis. We also observed that both CEPT1 and FAS are abundant in the peripheral arterial intima of patients with diabetes and CLI. Additionally, we recently discovered that serum circulating FAS (cFAS) is elevated in the serum of patients with advanced diabetes and CLI. Furthermore, cept1 knockout in the endothelium leads to significantly reduced atheroprogression and normalization of serum lipid profiles. Innovation: The main objective of this proposal is to determine whether de novo lipogenesis and Fenofibrate can affect peripheral atheroprogression in the setting of diabetes. This line of investigation will be highly innovative since it will address key knowledge gaps in the mechanisms that contribute to peripheral atheroprogression in diabetes, and may help tailor therapy for surgical patients afflicted by this condition. Specific Aims: We hypothesize that CEPT1 and cFAS are key players in EC lipid metabolism and have important roles in peripheral arterial atheroprogression in the setting of diabetes and CLI. Using a complement of biochemical techniques and already generated mouse lines, we will test this hypothesis in two aims: Aim 1 will determine whether CEPT1 and cFAS can affect peripheral arterial atheroprogression in the setting of diabetes, and Aim 2 will determine whether Fenofibrate affects endothelial de novo lipogenesis and peripheral atheroprogression.

项目摘要