胸水细胞8-OH-dG、k-ras和p53基因的表达及其临床意义  

Expressions of 8-OH-dG, k-ras, and p53 Genes in Pleural Effusion Cells and Their Clinical Significances

作　　者：傅晓源 宾晓农[2] 谭敏 

机构地区：[1]广东省深圳市福永医院,广东深圳518101 [2]广州医学院化学致癌研究所,广东广州510182 [3]广州中医药大学第二附属医院病理科,广东广州510120

出　　处：《癌症》2005年第3期345-348,共4页Chinese Journal of Cancer

基　　金：广东省医学科学技术研究基金(No.B2002058);深圳市科学技术研究基金(No.200204161)~~

摘　　要：背景与目的:DNA的氧化损伤是外来致癌物导致癌变发生的重要机制之一。8-羟基脱氧鸟嘌呤(8-hydoxy-2deoxyguanosine,8-OH-dG)作为DNA氧化损伤的指标,在肺癌的发生、发展及预后扮演着重要角色。研究发现肺组织癌变的过程中8-OH-dG表达水平与k-ras、p53基因突变的关系密切,故作为肺癌标记物在良、恶性判别诊断中具有重要意义。本课题拟探讨胸水细胞8-OH-dG、k-ras和p53基因表达与肺癌的关系,并分析它们在肺癌的微创性良、恶性判别诊断中的价值。方法:用免疫细胞化学法测定53例肺癌患者、53例非肺癌患者的胸水细胞中8-OH-dG、k-ras和p53基因的蛋白表达情况。结果:肺癌组、非肺癌组胸水细胞8-OH-dG阳性率分别为75.5%(40/53)与15.1%(8/53),k-ras基因的蛋白表达阳性率分别为64.2%(34)与3.8%(2),p53基因的蛋白表达阳性率分别为69.8%(37/53)与18.9%(10/53),P值均<0.01,两组比较差异有高度显著性;53例肺癌患者胸水细胞8-OH-dG、k-ras和p53基因的蛋白表达分值均数分别为1.68±1.21、1.32±1.06与1.57±1.15,经等级相关分析8-OH-dG与k-ras基因的蛋白表达呈高度正相关(RS=0.643,P<0.01),8-OH-dG和p53基因的蛋白表达呈高度正相关(RS=0.827,P<0.01),k-ras和p53基因的蛋白表达呈高度正相关(RS=0.897,P<0.01)。结论:肺癌?BACKGROUND & OBJECTIVE: Oxidative DNA damage plays an important role in carcinogens-induced carcinogenesis. 8-hydoxy-2deoxy-guanosine (8-OH-dG), a biomarker of oxidative DNA damage, plays important roles in initiation, progression, and prognosis of lung cancer, and closely relates with mutations of k-ras and p53 genes in carcinogenesis of lung tissue. This study was to detect protein expressions of 8-OH-dG, k-ras, and p53 genes in lung cancer tissues, and to analyze their values in distinguished diagnosis of lung cancer. METHODS: Protein levels of 8-OH-dG, k-ras, and p53 in pleural effusion cells from 53 patients with lung cancer, and 53 patients with other benign lung diseases were detected by immunocytochemistry. RESULTS: Positive rates of 8-OH-dG, k-ras, and p53 protein in cancer group were significantly higher than those in benign disease group [75.5% (40/53) vs. 15.1% (8/53), P < 0.01; 64.2% (34/53) vs. 3.8% (2/53), P < 0.01; and 69.8% (37/53) vs. 18.9% (10/53), P < 0.01;respectively]. Protein levels of 8-OH-dG, k-ras, and p53 protein in cancer group were 1.68±1.21, 1.32±1.06, and 1.57±1.15,respectively. Rank correlation analysis showed that protein expression of 8-OH-dG positively correlated with those of k-ras (RS=0.643, P < 0.01), and p53 (RS=0.827, P < 0.01); protein expression of k-ras positively correlated with that of p53 (RS=0.897, P < 0.01). CONCLUSIONS: Protein expressions of 8-OH-dG, k-ras, and p53 are up-regulated in pleural effusion cells of lung cancer, and have mutual relations. They may be used as reference markers in diagnosing and screening for lung cancer.

关 键 词：K-RAS 胸水细胞 蛋白表达 P53基因 肺癌患者 诊断 阳性率 分值 结论 课题 

分 类 号：R734.2[医药卫生—肿瘤]