非小细胞肺癌中MTAP蛋白及基因表达水平的检测

Detection of MTAP Protein and Gene Expression in Non-small Cell Lung Cancer

背景与目的 MTAP基因是一种肿瘤抑制基因,在多种肿瘤组织中存在表达异常现象。本研究旨在探讨MTAP在非小细胞肺癌(non-small cell lung cancer,NSCLC)组织、癌旁组织以及边缘肺组织中的表达水平及临床意义。方法应用免疫组织化学方法及IPP图像分析软件观察52例NSCLC患者组织中MTAP蛋白的表达,采用实时荧光定量PCR及2-ΔΔCt法定量分析MTAP mRNA的相对表达量。结果 MTAP在NSCLC组织中的蛋白表达分别明显低于癌旁组织和边缘肺组织(t分别为10.283、10.940,均P<0.001),MTAP蛋白的表达与肺癌患者性别、年龄、吸烟史以及肿瘤的病理类型无明显关系,但与肿瘤的分化程度有密切关系(t=2.310,P=0.025)。NSCLC组织中MTAP mRNA相对表达量明显低于癌旁组织(t=9.902,P<0.001)。结论肺癌组织中存在MTAP mRNA和蛋白表达水平下调,可能与NSCLC的发生和进展有关。

Background and objective The abnormal expression of MTAP, a tumor suppressor gene, is found in a variety of tumor tissues. The aim of this study is to detect the expression of MTAP mRNA protein and the clinical significance for the therapy of non-small cell lung cancer tissue （NSCLC）. Methods The expression of MTAP protein was detected by immunohistochemistry in 52 cases of NSCLC patients. The relative expression MTAP mRNA was detected by real-time quantitative PCR. Results The expression of MTAP protein in NSCLC tissue was significantly lower than that in paracarcinomous tissue and borderline lung tissue respectively （t=10.283, 10.940, P〈0.001）. There was no significant difference among gender, age, smoking history, histology except differentiation （t=2.310, P=0.025）. The MTAP mRNA relative expression in NSCLC tissue was significantly lower than that in paracarcinomous tissue （t=9.902, P〈0.001）. Conclusion Downregulation of MTAP protein and gene expression is correlated to the oncogenesis and progression of NSCLC.