项目名称: RTN3对血管内皮细胞凋亡与粘附的双调控及其机制研究
项目编号: No.30800476
项目类型: 青年科学基金项目
立项/批准年度: 2009
项目学科: 轻工业、手工业
项目作者: 项荣
作者单位: 中南大学
项目金额: 20万元
中文摘要: 动脉粥样硬化(AS)发病和死亡率都很高。血管内皮细胞凋亡过度和内皮粘附性改变是AS的重要始动环节,其中的分子调控机制仍所知甚少。前期研究证实:RTN3(reticulon3)是内质网膜蛋白,网络调控多种细胞凋亡;它可定位于细胞质膜,影响粘附分子的表达;本研究中我们通过pull down和免疫共沉淀实验验证了RTN3与粘附分子CRELD1蛋白之间存在相互作用;与CRELD1结合后,RTN3的定位发生明显的改变,从内质网移位到细胞质膜上;RTN3与CRELD1的结合降低了RTN3通过内质网途径诱导凋亡的活性;炎性因子刺激使RTN3在内皮细胞表面的表达增加,而RTN3在内皮细胞中的稳定高表达会影响到内皮的粘附功能;RTN3 在内皮细胞中可以定位在细胞质膜;质膜RTN3表达增加,内皮粘附增强;动脉粥样硬化小鼠模型内皮RTN3的表达增加,腺病毒-SiRNA-RTN3对主动脉斑块大小的影响不明显,且RTN3对斑块的影响是可逆的,体内应存在代偿机制来弥补RTN3的缺失;人血清和血浆中含有RTN3,动脉粥样硬化病人的血清RTN3含量高于正常人,初步阐明了RTN3 调控 AS 相关的凋亡和粘附的机制。
中文关键词: 动脉粥样硬化(AS);RTN3;CRELD1;细胞凋亡;粘附
英文摘要: Statistics of atherosclerosis (AS) are in the high level in both morbility and mortality. The over apoptosis of vascular endothelial cells (VEC) and the varying adhesiveness of endothelial cells is regarded as critical processes at the very beginning of AS. The molecular mechanism of the process is still rarely known. The apoptosis and adhesiveness of endothelial cells is regarded as critical processes of AS. We found RTN3 could localize in cytomembrane influencing the adhesion molecules. RTN3 could interact with CRELD1 in vitro and in vivo. Their interaction increased the localization of RTN3 on the plasma membrane.Their interaction moderately reduced the apoptotic activity of ER RTN3. Under the stimulation of inflammatory factor, RTN3 increased on the cell membrane. Stably high expression of RTN3 in endothelium cell modulated the cell adhesion. RTN3 could be found in human blood.Contents of RTN3 in normal human plasma were lower than in atheromatosis patients.We are expecting to provide a new theoretical basis and intervention targets for early diagnosis and treatment.
英文关键词: Atherosclerosis;RTN3;CRELD1;apoptosis;cell adhesion