项目名称: 去乙酰化酶SIRT1在血管内皮细胞氧化低密度脂蛋白代谢中的作用及机制研究
项目编号: No.81200894
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 神经系统疾病、精神疾病
项目作者: 张艳林
作者单位: 苏州大学
项目金额: 23万元
中文摘要: 血管内皮细胞(VEC)氧化脂质的异常聚集是动脉粥样硬化进程中的重要环节。LOX-1介导的细胞摄取增多及入胞后的降解障碍是氧化低密度脂蛋白(ox-LDL)在VEC聚集的主要机制。我们首次发现上调自噬能够促进ox-LDL降解。VEC SIRT1是一种关键的抗AS调节因子,最近研究表明SIRT1能下调巨噬细胞LOX-1表达,促进自噬。然SIRT1对VEC氧化脂质代谢的影响尚未阐明。因此本课题将在此基础上,运用荧光免疫、流式细胞术等方法,在细胞和整体动物水平检测:1.VEC ox-LDL含量;2. LOX-1介导的ox-LDL细胞结合、转运;3.自噬/溶酶体标志蛋白的表达及与Dil-ox-LDL的细胞共定位,研究SIRT1对ox-LDL在VEC聚集的影响,探讨该作用是否与其抑制LOX-1介导的入胞,促进ox-LDL入胞后的自噬性降解有关。这对全面评估SIRT1的血管保护作用及新药研发具有重要意义。
中文关键词: SIRT1;氧化低密度脂蛋白;自噬;植物血凝素样氧化低密度脂蛋白受体-1;血管内皮细胞
英文摘要: The accumulation of oxidized lipid in the vascular endothelial cell is one of the key events occurred in the development of atherosclerosis. Up to now, there still have no good method to prevent and reverse this pathological accumulation of oxidized lipid. Lectin-like oxidized low density lipoprotein ( ox-LDL ) receptor-1 (LOX-1) is a kind of ox-LDL receptor and is believed to be the main receptor for ox-LDL. The aggregation of ox-LDL in vaslular endothelial cell is associated with the increase of LOX-1-mediated uptake and decrease of degradation of oxidized LDL by endothelial cell.How to prevent this pathological process is important for the prevent and cure of atherosclerosis.Autophagy is a potential drug target for atherosclerosis plaque stabilization.We firstly found that the autophagy/lysosome pathway is involved in the degradation of ox-LDL, thus playing a protective role in the ox-LDL-induced injury of human umbilical vein endothelial cell.SIRT1 is a NAD+-dependent class Ⅲ histone deacetylase that mediates the effects of caloric restriction on lifespan and metabolic pathways in various organisms. SIRT1 activation is a promising therapeutic approach in atherosclerosis, which can regulate inflammatory processes,suppresses the expression of endothelial tissue factor and hence exerts anti-thrombotic propertie
英文关键词: SIRT1;ox-LDL;autophagy;LOX-1;Vascular endothelial cells