双向电泳-质谱法寻找类风湿关节炎疾病相关蛋白

Mass spectrometric proteome analyses of plasma obtained from patients suffering from rheumatoid arthritis

目的建立正常人及类风湿关节炎(rheumatoid arthritis,RA)患者血浆蛋白质的双向凝胶电泳图谱,并分析其差异表达的蛋白质,寻找RA疾病相关蛋白,以阐明RA的发病机制。方法采用固相pH梯度(immobilized pH gradi-ent,IPG)双向凝胶电泳(two-dimensional gel electrophoresis,2-DE)分离正常人及类风湿关节炎患者血浆总蛋白质,凝胶经银染显色后,PDQuest图像分析软件进行比较分析、识别差异表达的蛋白质,对差异蛋白质点用基质辅助激光解析电离飞行时间质谱进行鉴定。结果获得正常人及类风湿关节炎患者血浆蛋白双向凝胶电泳图谱,平均蛋白质点数分别为592和563,匹配率分别为89%和87%,通过比较分析,差异表达蛋白质点数为24,选取15个点进行质谱鉴定,成功鉴定7个蛋白质,其中6个蛋白质表达上调。结论两者间存在一些差异表达的蛋白质,为阐明RA的发病机制打下了坚实的基础。

Objective To find the different plasma-associated proteins of rheumatoid arthritis （RA） by using two-dimensional gel electrophoresis for understanding the pathogenesis of RA. Methods The total protein from either RA patients or normal ones was prepared by means of immobilized pH gradient based on two-dimensional gel electrophoresis. After silver staining, gel-image analysis was performed by using PDQuest. The differentially expressed proteins were identified by matrix-assisted laser desorption ionization-time-of-flight mass spectrometry （MALDI-TOF-MS）. Results 2-DE patterns of plasma from controls and RA patients were presented. The results showed that average number of protein spots was 592 and 563 respectively, and the corresponding average matching rate was 89% and 87% respectively. Gel-image analysis revealed that there were 24 differential protein spots. A total of 15 differential protein spots were successfully identified by MALDI-TOF-MS, of which 6 proteins were up-regulated as compared with control. Conclusion The differentially expressed proteins can be observed in plasma from RA and controls, which can be used to elucidate the pathogenesis of RA for further study.