溃疡性结肠炎血清差异蛋白的筛选研究

目的 应用蛋白质组学寻找溃疡性结肠炎(UC)血清差异蛋白,初步探索UC可能的生物标志物.方法 收集UC患者30例和健康对照者30名的血清标本,双向凝胶电泳(2-DE)分离等量混合血清的蛋白质,运用图像分析软件进行比较和分析,识别差异表达蛋白质.应用基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF-MS)鉴定部分差异蛋白质点.结果 UC组和对照组之间年龄、体重指数、吸烟情况和饮酒量的差异均无统计学意义(P值均＞0.05).初步筛选出UC患者与健康对照者存在明显差异的39个蛋白点,选择其中9个点,经质谱分析发现触珠蛋白、热休克转录因子2、受体酪氨酸激酶、醛脱氢酶、载脂蛋白C-Ⅲ、中心粒旁物质1在UC患者中表达水平升高,角蛋白1、细丝蛋白A结合蛋白1、肌球蛋白3在UC患者中表达水平降低.结论 采用蛋白质组学2-DE和质谱技术,筛选并鉴定出与UC相关的9个血清蛋白质,为提供新的UC生物学行为研究分子标志物奠定基础.

The study on screening the differences of serum proteins in ulcerative colitis

Objective To search for the differences of serum proteins expression in ulcerative colitis (UC) by proteomics method and to preliminary explore the potential biological markers of ulcerative colitis. Method The serum of 30 ulcerative colitis patients and 30 healthy individuals were collected. The equal amounts of proteins in pooled serum were separated by two-dimensional gel electrophoresis (2-DE) and then compared and analyzed by image analysis software to recognize the differences of protein expression. Some spots of proteins with different expression were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS).Result There was no statistic significant in age, weight index, smoking and alcohol taking between UC group and control (P ＞ 0.05 respectively). Thirty-nine proteins with significant different expression between UC patients and healthy individuals were preliminary screened out. Nine of those spots were selected, after analyzed by MALDI-TOF-MS, it was found that the expression of haptoglobin, heat shock factor protein 2, receptor tyrosine kinase, aldehyde reductase,apolipoproteinC-Ⅲ, pericentriol material 1 increased in ulcerative colitis patients, keratinl, filamin A interacting protein 1 and tropomyosin 3 decreased. Conclusions With proteomics 2-DE and spectrometry methods, nine UC associated serum proteins were screened out and identified, which provide new molecular markers for the research of UC biological behavior.