项目名称: 构建表达fat-1基因的AD动物模型及内源性DHA与AD的相关性探究
项目编号: No.31272389
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 生物科学
项目作者: 李文德
作者单位: 广东医学院
项目金额: 83万元
中文摘要: 为了解决DHA在体实验研究过程中饮食因素的干扰,本研究团队首次建立fat1 转基因小鼠(Nature,2004),使得动物内DHA显著升高,并发现该模型DG区神经元分化及海马锥体神经元树突棘发育较野生型小鼠均有显著的促进,水迷宫测试显示更出色的空间学习记忆能力(PNAS,2009),提示内源性DHA增多对中枢神经系统具有积极的意义。这些发现激发我们进一步研究DHA对阿尔茨海默病的保护作用。本项目拟利用该模型与含有人类AD患者突变的APPswe基因的小鼠和突变的tau蛋白基因的小鼠杂交,率先建立表达fat 1基因的AD小鼠模型。对该模型进行行为学指标、AD病理学指标、分子生物学指标的检测,与AD模型小鼠进行比较,直接评判内源性DHA增多对AD小鼠的作用,阐明内源性DHA增多对AD病理特征的作用机制,理解DHA在脑内的作用网络,为AD的防治提供崭新理论。
中文关键词: 阿尔茨海默病;二十二碳六烯酸;N-3不饱和脂肪酸;fat1 基因;动物模型
英文摘要: To exclude confounding variables associated with the diet in DHA research, our team had generated a fat 1 Tg mice, which increase brain DHA(Nature,2004). By using the model, we show that increased brain DHA significantly enhances hippocampal neurogenesis shown by an increased number of proliferating neurons and neuritogenesis, evidenced by increased density of dendritic spines of CA1 pyramidal neurons in the hippocampus. Concurrently, fat-1 mice exhibit a better spatial learning performance in the Morris water maze compared with control WT littermates(NAS,2009). These findings motivate us to further investigate the neuroprotective effects of DHA on AD. Here, we cross fat 1 Tg mice with tau P301L Tg-AD mice and APPswe Tg-AD mice to generate two genotypes: fat-1/APPswe-AD and fat-1/tau-AD, and investigate the impact of endogenous DHA on AD hallmark pathology and behavior in the newly developed animal model. Understand the mechanism of endogenous DHA on AD and its action network in the brain will help us to explore the potential utility of DHA in the treatment of neurodegenerative diseases.
英文关键词: Alzheimer disease;Docosahexaenoic acids;N-3 PUFAs;Fat-1 gene;Animal model