Alzheimer's disease (AD),a degenerative neurological disorder,is the most common form of dementia among older people,whose symptoms include gradual memory loss,cognitive impairments and deterioration of language s...Alzheimer's disease (AD),a degenerative neurological disorder,is the most common form of dementia among older people,whose symptoms include gradual memory loss,cognitive impairments and deterioration of language skills.Amyloid precursor protein (APP) is cleaved by serials of secretases and generates Aβ,sAPPα/β and APP intracellular domain (AICD).Aβ forms amyloid plaques,together with neurofibrillary tangles (NFTs) which is comprised with hyperphosphorylated tau,are hallmarks ofAD.Aβ,especially in its oligomeric form,plays important roles in AD,causing cell death,calcium influx,loss of spines and repression of long-term potentiation (LTP)[1].However,recent studies indicate that in addition to Aβ,other fragments of APP after its cleavage,such as AICD,play essential roles in AD as well.In this article,the function of AICD and its underlying mechanisms will be reviewed.展开更多
目的:构建3种淀粉样前体蛋白(APP)胞外结构域突变体细胞株并进行功能的初步验证。方法:通过Touch down PCR的方法扩增E1结构域缺失的APP695片段以及E1和信号肽双缺失的片段,采用融合PCR的方法扩增E2结构域缺失的APP695片段,并将获得的...目的:构建3种淀粉样前体蛋白(APP)胞外结构域突变体细胞株并进行功能的初步验证。方法:通过Touch down PCR的方法扩增E1结构域缺失的APP695片段以及E1和信号肽双缺失的片段,采用融合PCR的方法扩增E2结构域缺失的APP695片段,并将获得的片段连接于pCMV-APP695载体中得到APP胞外结构域突变体质粒;质粒转染CHO细胞后,添加G418筛选表达APP胞外结构域突变体的单克隆细胞系;通过Western blot方法检测APP胞外结构域突变体的表达及胞外分泌水平,分析信号肽对该突变体分泌的影响。结果:成功获得了APP的E1结构域突变体、E1/信号肽双缺失突变体以及E2结构域突变体细胞株,且APP突变体可以正常表达和分泌,但是信号肽缺失后APP突变体可以表达、而不能分泌。结论:APP的E1和E2结构域对APP蛋白的胞外分泌无影响。展开更多
文摘Alzheimer's disease (AD),a degenerative neurological disorder,is the most common form of dementia among older people,whose symptoms include gradual memory loss,cognitive impairments and deterioration of language skills.Amyloid precursor protein (APP) is cleaved by serials of secretases and generates Aβ,sAPPα/β and APP intracellular domain (AICD).Aβ forms amyloid plaques,together with neurofibrillary tangles (NFTs) which is comprised with hyperphosphorylated tau,are hallmarks ofAD.Aβ,especially in its oligomeric form,plays important roles in AD,causing cell death,calcium influx,loss of spines and repression of long-term potentiation (LTP)[1].However,recent studies indicate that in addition to Aβ,other fragments of APP after its cleavage,such as AICD,play essential roles in AD as well.In this article,the function of AICD and its underlying mechanisms will be reviewed.
文摘目的:构建3种淀粉样前体蛋白(APP)胞外结构域突变体细胞株并进行功能的初步验证。方法:通过Touch down PCR的方法扩增E1结构域缺失的APP695片段以及E1和信号肽双缺失的片段,采用融合PCR的方法扩增E2结构域缺失的APP695片段,并将获得的片段连接于pCMV-APP695载体中得到APP胞外结构域突变体质粒;质粒转染CHO细胞后,添加G418筛选表达APP胞外结构域突变体的单克隆细胞系;通过Western blot方法检测APP胞外结构域突变体的表达及胞外分泌水平,分析信号肽对该突变体分泌的影响。结果:成功获得了APP的E1结构域突变体、E1/信号肽双缺失突变体以及E2结构域突变体细胞株,且APP突变体可以正常表达和分泌,但是信号肽缺失后APP突变体可以表达、而不能分泌。结论:APP的E1和E2结构域对APP蛋白的胞外分泌无影响。
