应用蛋白质组学技术筛检肝癌血清差异蛋白质并分离鉴定阿朴脂蛋白AⅡ

Objective To screen differential proteins in serum from hepatocellular carcinoma (HCC) patients by Proteomic Technology and to purify and identify them. Methods Surface enhanced laser desorp-tion Ionization time of flight-mass spectrum (SELDI-TOF-MS) was employed to screen differential proteins in serum from 33 HCC patients and 33 control cases, and then to purify and identify them using isoelectric precipitation, Tricine sodium dodecyl sulphate ployacrylamide gel electrophoresis (Tricine-SDS-PAGE) and high performance liquid chromatography tandem Mass Spectrum (HPLC-MS). Result 65 protein peaks in the range of relative molecular weight from 2000 to 10 000 were found significant difference (P < 0.05) between the patient group and control group. Based on these differential protein peaks, diagnostic model for HCC detection was established and its sensitivity and specificity were 100% and 96.97 % respectively. Proteins with 8706.5 and 8579.2 relative molecular weights (the t value was 2.562 and 2.783 respectively, and P value was 0.013 and 0.015 respectively) out of the 65 differential proteins were purified and identified, and then recognized as Apolipoprotein A Ⅱ (Apo AⅡ). Conclusion Apo A II is probably a differential protein of HCC and maybe related to the pathogenesis of HCC.

The screening and identification of Apolipoprotein A-II from serum differential proteins in hepatocellular carcinoma patients