中文摘要：

目的筛选具有提高神经内肽酶(NEP)活性从而降低神经细胞β-淀粉样肽(Aβ)水平的药物,为临床治疗阿尔茨海默症(AD)提供实验依据。方法以脂质体LipofectamineTM2000介导瑞典突变型淀粉样肽前体蛋白(sweAPP)表达质粒pcDNA3.1-sweAPP转染神经母细胞瘤细胞SK-N-SH,G418筛选获得稳定表达细胞株作为AD模型细胞,采用蛋白印迹技术检测sweAPP表达情况,酶联免疫吸附试验(ELISA)检测细胞培养基中A4β0和A4β2含量变化,进而以MTT法检测各天然药物对SK-N-SH细胞增殖能力的影响,确定药物的有效浓度及最佳作用时间,以NEP肽酶实验检测药物对NEP酶活性影响,ELISA法检测药物对Aβ水平的影响。结果Western Blot结果显示,转染后SK-N-SH细胞高表达sweAPP蛋白;ELISA结果显示,转染后的SK-N-SH细胞分泌A4β0、A4β2明显升高,分别为转染前的7.26和3.27倍(P<0.05)。NEP肽酶实验检测结果显示,茶多酚、人参皂苷Rb1、Rg3能够明显提高NEP酶活性,分别为(117±2.8)%(、131±4.0)%和(121±1.6)%。ELI...

英文摘要：

Objective To obtain potential chemicals useful for chemotherapy of Alzheimer′s disease(AD) by screening naturally occurring compounds which could increase the Neprilysin(NEP) activity.Methods Neuroblastoma cells were cultured(SK-N-SH cells) and pcDNA3.1-sweAPP was transfected into the SK-N-SH cells with LipofectamineTM2000,and G418 was used for screening.The stably transfected cells were confirmed with Western blot and enzyme linked immunosobent assay(ELISA). MTT was used to identify the optimal drug concen...