项目名称: 内皮细胞分泌含miR-221微囊泡介导系膜细胞损伤的机制研究
项目编号: No.81500564
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 医药、卫生
项目作者: 孙琦
作者单位: 南京医科大学
项目金额: 18万元
中文摘要: 糖尿病肾病是糖尿病的重要并发症之一。肾小球系膜区细胞外基质的积聚是糖尿病肾病最主要的病理特征,但高血糖导致基质积聚的机制尚未完全明确。系膜细胞的损伤与细胞外基质的积聚密切相关。研究发现,Ets-1/MMPs是系膜细胞调节细胞外基质降解的重要因素,miR-221能调控Ets-1表达。我们的预实验发现,高糖能刺激内皮细胞分泌富含miR-221的微囊泡。因此,本项目以STZ诱导的糖尿病肾病小鼠为研究模型,探讨高糖条件下,肾小球内皮细胞能否通过分泌富含miR-221的微囊泡进入系膜细胞,调节靶细胞内Ets-1/MMPs的表达,阻碍细胞外基质的降解,加重糖尿病肾病,并进一步探讨通过下调miR-221水平延缓糖尿病肾病进程的可能性。
中文关键词: 糖尿病肾病;微囊泡;微小RNA;肾小球内皮细胞;E26转录因子-1
英文摘要: Diabetic nephropathy (DN) is one of the major microvascular complications of diabetes mellitus, which is characterized by extracellular matrix (ECM) accumulation in glomeruli. However, the mechanism of hyperglycemia induced ECM remolding has not been fully elucidated. It has been proved that mesangial cell injury contributed to ECM expansion and Ets-1/MMPs played a key role in ECM degradation. miR-221 could inhibit Ets-1 expression. In the mean time, our previous data showed that, under a hyperglycemia condition, endothelial cells overexpressed miR-221 and secreted them into extracellular area via microvesicles. Therefore, the aim of this study is to investigate whether endothelial cells promotes ECM accumulation by secreting miR-221-containing microvesicles into mesangial cells, and the possibility of retarding DN progression by downregulating miR-221 expression.
英文关键词: Diabetic nephropathy;Microvesicle;microRNA;Renal glomerular endothelial cell;Ets-1