摘要目的 从蛋白质水平初步探讨晚发型阿尔茨海默病发病机制,寻找并鉴定与之有关的生物标志物.方法 选择经病理证实的8例晚发型阿尔茨海默病患者及5例正常老年人颞叶脑皮质为研究对象.分别进行双向凝胶电泳后采用基质辅助激光解析-电离-飞行时间质谱及电喷雾电离串联质谱法进行质谱分析,搜索数据库鉴定蛋白质.结果 分别获得两组脑组织双向凝胶电泳蛋白质组表达图谱,DJ-1蛋白在疾病组明显上调.结论 DJ-1蛋白可能成为具有临床诊断意义的晚发型阿尔茨海默病潜在标志物,从而帮助开发靶向目的 蛋白质的新型抗神经退化药物.

abstractsObjective To investigate the pathogenicity of late-onset Alzheimer disease from the viewpoint of comparative proteomic technology and to screen it from diseases with related protein markers.Methods Cerebral cortex tissue of temporal layer of 8 cases of late-onset Alzheimer disease and 5 cases of age-matched autopsied controls with normal brain was chosen for this study.Cerebral proteins were run through immobilized pH gradient (IPG) isoelectric focusing electrophoresis as the first dimension and then vertical SDS-PAGE electrophoresis as the second dimension.Differential proteins were identified with visionworks LS and then analyzed with matrix assisted laser desorption ionization time of flight mass spectrometry(MALDI-TOF-MS) and eleetrospray ionization mass spectrometry (ESI-MS).Finally,the protein was identified by searching in the data bank.Results Different 2-dimensional gel electrophoresis maps were obtained for the protein spots in the late-onset Alzheimer disease group and the control group gels.11 protein spots showed a significantly differential expression between the two groups of cerebral cortex samples.It was found that the expression of DJ-1 protein was increased in the late-onset Alzheimer disease group in comparison with the control group after searching in the database.Conclusion DJ-1 protein may be a potential marker related to Alzheimer disease pathogenicity.This finding would be helpful to develop new drugs which focus on this protein and prevent nearodegeneration.