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.
出处
《癌症》
SCIE
CAS
CSCD
北大核心
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)~~
