项目名称: 玻璃体腔内注射E4a改善大鼠糖尿病性视网膜病变机理研究
项目编号: No.81200695
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 医学二处
项目作者: 张瑜
作者单位: 复旦大学
项目金额: 23万元
中文摘要: 糖尿病性视网膜病变(糖网病,DR)是世界主要致盲眼病之一,缺少有效治疗方法。本课题组首次发现大鼠视网膜有胰升糖素样肽-1受体(GLP-1R)存在,并证实它参与DR的发生。但是,GLP-1R与DR发生发展的关系,国内外迄今尚无报道。前期研究中,我们发现大鼠玻璃体腔内注射Exendin-4类似物(E4a,GLP-1的类似物)能上调GLP-1R、有效地保护其视网膜细胞、改善视觉功能。近期实验表明E4a可下调血管内皮生长因子(VEGF)、改善血-视网膜屏障(BRB)功能。我们推测:E4a改善视功能的作用可能是通过其保护BRB实现的。目前,相关机理尚不清楚。本项目拟采用糖尿病大鼠模型研究E4a保护BRB、改善糖网病的分子机制,主要聚焦于E4a如何调控VEGF及其他BRB相关分子(如紧密连接蛋白、粘附分子等),力求能阐明E4a的作用机理,并为探索可能的新的药物干预靶点及研发新药物提供依据和指导。
中文关键词: 糖尿病性视网膜病变;GK大鼠;血-视网膜屏障;凋亡;GLP-1受体
英文摘要: Diabetic retinopathy (DR ) is the main cause of blindness which lack of effective intervention method. We first found the presence of Glucagon like peptide-1 receptor ( GLP-1R ) in the rat retina, confirmed that it participated in the course of DR. Our recent studies showed that, intraocular injection of exendin-4 analogues (E4a, GLP-1 analogues) can effectively protect the retinal cells and the function of blood retinal barrier (BRB), improve the visual function. We also observed upregulation of GLP-1R after E4a treatment. We hypothesized that: E4a improved the visual function may be realized through its protection of BRB. At present, the mechanism is not clear. The project will adopt diabetic rat model on studying the BRB protection of E4a and the molecule mechanisms. We will focus on how E4a regulate VEGF and other BRB related molecules (such as tight junction protein, adhesion molecules, etc.), to elucidate the mechanism of action of E4a, and to explore the possible new drug intervention targets and provide reference and guidance of research and development of new drugs.
英文关键词: Diabetic retinopathy;GK rats;blood retinal barrier;apoptosis;GLP-1 receptor