中文摘要
阿尔兹海默氏病(Alzheimer’s disease,AD)是一种进行性发展的致死性神经退行性疾病,其主要病理特征为最终大脑中充斥着杂乱的纤维化β淀粉蛋白寡聚体。AD的病因及发病机制尚未阐明。自噬可以选择性降解异常蛋白质聚集体,对AD等神经退行性疾病具有重要的调控作用。前期我们筛选出一种新型喹唑啉类化合物GTM-1,它可以迅速诱导自噬并保护神经细胞免受β淀粉蛋白寡聚体的毒性。我们还意外的发现GTM-1不直接作用与Akt和mTOR蛋白,这与雷帕霉素(最敏感的自噬诱导剂,通过抑制Akt/mTOR/p70S6K通路来诱导自噬)不同。那么,GTM-1诱导神经细胞自噬的直接作用蛋白是什么呢?本课题拟通过亲和色谱方法寻找并验证GTM-1调节神经细胞自噬的直接作用蛋白并进行功能和结构生物学验证。本课题的完成将有助于阐明GTM-1保护神经细胞、治疗AD的分子作用机制,拓展喹唑啉衍生物在AD中的应用价值。
英文摘要
Alzheimer disease (AD) is a neurodegenerative disease, which eventually leads to death, and its cause and progression are not well understood. The autophagy is a selective degradation pathway. Abnormal protein aggregates, unnecessary or dysfunctional cellular components and pathogens may be selectively infiltrated into autophagosome, and are transported to lysosome for degradation. Perhaps autophagy plays a protective role in the early stage of Alzheimer disease. GTM-1, a quinazoline compound, could protect mouses' nerve by regulating the autophagy of neurons. However, it holds a different target with rapamycin. The goal of this project is to identify the potential target(s) of GTM-1 and confirm the interaction between GTM-1 and its target(s). This research will help to understand the molecular mechnism of GTM-1 and allow a better study on quinazolines' applications to the treatment of AD.
结题摘要
阿尔兹海默氏病(Alzheimer’s disease,AD)是一种致死性的神经退行性疾病,其病因及发病机制尚未阐明,而小胶质细胞在AD发展过程起到非常重要的作用。前期我们筛选出一种新型喹唑啉类化合物GTM-1,可以迅速诱导自噬并保护神经细胞免受Aβ毒性;进一步实验发现,Aβ可以诱导小胶质细胞发生内质网应激并同时激活UPR信号通路,进而诱发慢性炎症反应;TUDCA可以缓解小胶质细胞内质网应激,明显抑制Aβ引起的炎性因子表达,减少神经细胞凋亡。本项目拟构建小鼠模型,联合细胞生物学方法研究Aβ激活UPR信号通路的主要作用机制。在此基础上,进一步探索新型喹唑啉类化合物GTM-1抑制UPR信号通路而减少神经细胞凋亡的分子机制,求证URP信号通路作为药物靶标的潜在可能,为阿尔兹海默病药物的研发提供物质基础和新思路。
