PCR-SSCP技术检测矽肺合并肺癌癌组织p53基因突变的研究

用ＰＣＲ－ＳＳＣＰ分析法对３６例矽肺患者的石蜡包埋的原发性肺癌组织ｐ５３基因第５、７、８外显子进行了检测，检出突变１５例。突变在第５、７、８外显子上都有发生，但以第８外显子上发现的阳性突变最多。对肿瘤类型和ｐ５３基因突变的关系进行了分析，发现矽肺病例肺腺癌ｐ５３基因阳性突变率最高，为５３．９％，高于普通型肺癌（３３．０％）。进一步对其中１例样本进行核苷酸序列直接测定，结果显示第５外显子非突变热点区的第１４４位密码子核苷酸由ＣＡＧ突变为ＡＡＧ，氨基酸由谷氨酰胺突变为赖氨酸，以上结果与非职业肺癌明显不同，提示ｐ５３基因突变在矽肺病例肺癌发生中起着重要作用，可能与矽尘作业环境中含有的某些化学致癌物有关。

The Research on p53 Gene Mutation in

Using polymerase chain reaction single strand conformation polymorphism analysis(PCR SSCP), the authors mutations in exon 5,7 and 8 of the p53 gene in lung cancer tissue from 15 of 36 silicotic patients. Mutations existed in exon 5, exon 7 and exon 8, but occured more frequently in exon 8. The authors also found that p53 gene mutation rate in lung adenocarcinomas of silicotic patients was higher than that of those without silicosis. A single base substitution was found by DNA sequencing analysis in sample C 8. As a result, No.144 codon was mutated from CAG to AAG, so Gln was substituted by Lys. The authors' data suggest that p53 mutation may play an important role in the pathogenesis of lung cancer of silicotic patients.