目的 检测非小细胞肺癌细胞系中KEAP1及NF-E2相关因子2(NRF2)相互作用结构域基因的突变情况.方法 以6个非小细胞肺癌细胞系为材料,检测KEAP1基因的第2至第6外显子及NRF2的DLG和ETGE基序编码序列的碱基序列突变情况,推测相应的氨基酸序列变异.同时检测供试细胞系的细胞内活性氧浓度,分析目标序列突变对肺癌细胞抗氧化系统的影响.结果 在KEAP1基因第4外显子区域发现4个所有癌细胞系共有的突变,部分细胞系的第3外显子区域还存在错义突变,所有NRF2-ETGE基序编码序列均存在多重遗传变异.活性氧检测发现供试细胞系活性氧浓度均高于肺胚细胞.结论 KEAP1和NRF2基因相互作用结构域的基因突变在供试细胞系内普遍存在,非小细胞肺癌细胞系对细胞内活性氧浓度失去调控能力是普遍现象.%Objective To detect the interaction domains' gene mutations of KEAP1 and NRF2 in non-small-cell lung cancer cell lines,and to analyze the significance of these mutations on the study of lung cancer cell lines.Methods Six non-small-cell lung cancer cell lines were used as the research materials.The 2nd to 6th exons of KEAP1 and the coding sequences of DLG and ETGE motif were amplified by PCR,and the products were used for gene sequencing analysis.Obtained gene sequences were analyzed using NCBI databases to get the base locations of gene mutations,as well as the subsequent amino acid sequence changes.Meanwhile,the relative intracellular reactive oxygen species (ROS) concentrations in the tested cell lines were detected and used in the analysis of abnormal NRF2 transcriptional activity in lung cancer cell.Results Four mutations were detected in the 4th exon of KEAP1 gene from all the 6 cancer cell lines,several other missense mutations were also investigated in the 3rd exon of KEAP1 from some cancer cell lines.Multiple genetic variations were found in all the NRF2-ETGE motif-encoding sequences of the 6 cancer cell lines.All 6 cancer cell lines were found to have higher ROS concentration than the lung germ cell line.Conclusion Lung cancer cells generally contain high levels of ROS as well as gene mutations in KEAP1 and NRF2 genes which lead to abnormal transcriptional activity of NRF2 in lung cancer cell lines.
展开▼
