肺癌组织中DNA修复基因ERCC1的表达与多环芳烃 -DNA加合物的关系

Expression of DNA repair gene ERCC1 and its relationship with PAH-DNA adducts in lung cancer tissues

目的 :探讨核苷酸切除修复基因ERCC1在肺癌中的表达及其与多环芳烃 (PAH) -DNA加合物的关系。方法 :用RT -PCR技术检测 15 0例肺癌、12 0例癌旁肺组织、4 0例肺良性病变和 4 0例正常肺组织中ERCC1基因mRNA的表达 ;用免疫法检测PAH -DNA加合物 ;分析有关暴露因素对修复基因ERCC1的表达和PAH -DNA加合物的影响 ,并探讨ERCC1与PAH -DNA加合物的关系。结果 :30 7% (4 6 / 15 0 )的肺癌组织和 2 5 % (1/ 4 0 )的正常肺组织存在ERCC1基因的表达低下 ;吸烟可抑制ERCC1基因的表达。肺组织中PAH -DNA加合物的水平与ERCC1基因表达呈显著负相关 ,Spearman相关系数为 - 0 6 4 8,P <0 0 1。结论 :ERCC1是参与修复DNA加合物等损伤的一个重要的核苷酸切除修复基因 。

AIM: To investigate the expression of nucleotide excision repair gene ERCC1 and its relationship with PAH (polycyclic aromatic hydrocarbons)-DNA adducts in lung cancer tissues. METHODS: ERCC1 mRNA expression and the PAH-induced DNA adducts were detected in 150 lung cancer tissues, 120 adjacent lung tissues without cancer cells, 40 benign lung lesions and 40 normal lung tissues. The effects of some exposure factors on the expression of ERCC1 gene and the connection between ERCC1 and PAH-DNA adduct was analyzed. RESULTS: Reduced expression levels of ERCC1 were observed in 46 of 150 (30.7%) lung cancer specimens and 1 of 40 (2.5%) normal lung tissues. Smoking may suppress the expression of ERCC1 gene. The level of PAH-DNA adduct was negatively correlated with the expression of ERCC1 gene, the Spearman coefficient was -0.648, P<0.01. CONCLUSION: ERCC1 is an important nucleotide excision repair gene and may participate in the repair of DNA damage, such as PAH-DNA adduct. Low expression of ERCC1 may play an important role in the development of human lung cancer. [