医药学论文:肺腺癌患者血清生物标志物的筛选研究
【关键词】 肺腺癌;生物标志物;SELDI-TOF-MS;蛋白质组学
The screening study on lung adenocarcinoma serum biomarkers by SELDI-TOF-MS
【Abstract】 Objective To select relative specific biomarkers in serum from lung adenocarcinoma patients using surface-enhanced laser desorption and ionization time of flight mass spectrometry (SELDI-TOF-MS) protein chip technology.Methods Serum samples from 321 lung adenocarcinoma patients, 321 healthy volunteers with matched gender, age and history of smoking were analyzed using WCX2 potein chip to screening potentially biomarkers. Proteomic spectra were generated by mass spectrometry.Results Five highly expressed potential biomarkers were identified with the relative molecular weights of 4055Da, 4211Da, 4959Da, 5329Da and 7762Da. The sensitivity for diagnosing lung adenocarcinoma was 90.41%, 78.08%, 50.68%, 57.53%, 72.60%; and specificity was 97.06%, 93.44%, 71.15%, 76.36%, 94.92%, when the critical point was made 1.5. The sensitivity for diagnosing lung adenocarcinoma was 86.67%, and specificity was 83.33% by applied to this protein fingerprints pattern validation.Conclusion SELDI-TOF-MS protein chip technology is a quick, easy, convenient, and high-throughput analyzing method capable of selecting several relatively specific, potential biomarkers from the serum of lung adenocarcinoma patients and may have attractive clinic value.
【Key words】 lung adenocarcinoma; biomarkers; SELDI-TOF-MS; proteomics
肺癌是目前全球发病率最高的恶性肿瘤之一,对人类健康的危害日益严重。目前,肺癌早期诊断困难。80%肺癌患者就诊时已属晚期, 失去了手术根治的机会,放疗化疗效果不佳, 5年生存率不到15%;而早期肺癌手术后5年存活率达70%[1],但肺癌早期确诊率只有约15%,故肺癌总的预后不良,与肺癌缺乏有效的早期诊断手段有关。因此,寻找灵敏度、特异性高的早期诊断方法是目前临床亟待解决的问题之一。
蛋白质组学作为后基因组学时代的重要研究工具,在肿瘤研究中已广泛应用。表面增强激光解析离子化飞行时间质谱技术(surface-enhanced laser desorption Ionization time of flight mass spectrometry, SELDI-TOF-MS)是一种新兴的蛋白质组学研究技术。使用这种技术,组分复杂的生物样品(如细胞液或体液)中的各种蛋白质通过特定的表面基团吸附于蛋白质芯片上,用激光脉冲辐射使结合在芯片上的蛋白质解析形成荷电离子,这些不同质荷比的离子在真空电场中飞行的时间长短不同,据此绘制出质谱图,可以简便、快速地获得各种蛋白质的分子量、丰度等信息。本研究使用SELDI技术,检测已明确诊断肺腺癌的患者血清样本,绘制蛋白质质谱图,分别与正常人进行比照,筛选出肺腺癌显著高表达的潜在标志物5个,并建立决策树模型对样品进行筛选。寻找肺癌发生发展的生物标志物,从而为肺癌的早期诊断提供新的依据。
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