应用非标记定量蛋白组学研究帕金森病差异表达蛋白

A study of differentially expressed proteins in Parkinson disease based on label-free quantitative proteomics

目的寻找帕金森病(PD)患者血清中差异表达的蛋白,探索PD生物学标志物。方法选择在北京医院临床确诊的PD患者24例,其中12例为仅有PD病史(P1组),另12例合并有高血压病、糖尿病基础疾病(P2组);筛选24例年龄、性别匹配的体检者(对照组C1和C2组),采集血清标本去除高丰度蛋白后,应用非标记定量蛋白组学技术检测各组血清中蛋白表达,采取双重对比将P1组与C1组、P2组与C2组比较,分别筛查出差异表达蛋白,再从中筛选出表达变化(上调或下调)一致的蛋白,确定为PD差异表达蛋白,并用生物信息学方法分析解释。结果各组对比后,共鉴定出4种差异表达的蛋白为PRG4、CFHR-3、ACTG1、HIST2H2BF,其中PD患者的血清中PRG4、CFHR-3表达上调,ACTG1、HIST2H2BF表达下调且存在一定的相互作用。结论应用非标记定量蛋白组学筛选出了帕金森差异表达的蛋白,可能对帕金森病的诊断具有一定的意义。

Objective To investigate the biomarkers for Parkinson disease(PD)by analyzing differentially expressed proteins in the serum of patients with PD.Methods A total of 24 patients with PD who were diagnosed in Beijing Hospital were enrolled,among whom 12 patients only had a medical history of PD(group P1)and the other 12 had underlying diseases such as hypertension and diabetes(group P2).A total of 24 individuals,matched for age and sex,who underwent physical examination were enrolled as control groups C1 and C2.Serum samples were collected,and after high-abundant proteins were removed,the label-free quantitative proteomics technique was used to measure the expression of proteins in serum.The double comparison method was used for comparison between groups P1 and C1 and between groups P2 and C2 to screen for differentially expressed proteins,and the proteins with a consistent changing trend(upregulation or downregulation)were identified as the differentially expressed proteins for PD,which were analyzed and interpreted by bioinformatics methods.Results Comparison between groups identified four differentially expressed proteins,i.e.PRG4,CFHR-3,ACTG1,and HIST2H2BF,among which PRG4 and CFHR-3 showed upregulated expression and ACTG1 and HIST2H2BF showed downregulated expression in the serum of PD patients,and a certain degree of interaction was observed.Conclusion Label-free quantitative proteomics can be used to identify the differentially expressed proteins in PD,which may have a certain value in the diagnosis of PD.