癌变·畸变·突变 ›› 2002, Vol. 14 ›› Issue (3): 135-138.doi: 10.3969/j.issn.1004-616x.2002.03.001

• 论著 •    下一篇

α-粒子诱发 BEP2D 细胞恶性转化中DNA修复基因DNA-PK的表达和突变分析

杨  涛 , 隋建丽 ,耿  煜 ,杨素霞 ,周平坤 ,吴德昌   

  1. 1. 军事医学科学院放射医学研究所放射毒理研究室 ,北京 100850;  2. 海军医学研究所 ,上海 200433
  • 收稿日期:2002-01-04 修回日期:2002-02-05 出版日期:2002-07-30 发布日期:2002-07-30
  • 通讯作者: 周平坤

MUTATIONS AND EXPRESSION CHANGES OF DNA-PK GENES DETECTED IN THE MALIGNANT TRANSFORMED BEP2D CELLS INDUCED BY α-PARTICLES EXPOSURE

YANG Tao,SUI Jian-li.GENG Yu,YANG Su-xia,ZHOU Ping-kun,WU De-chang   

  1. 1. Department of Radiation Toxicology,eijing Institute of Radiation Medicine.Beijing 100850, China;2. Institute of Naval Medicine, Shanghai 200433
  • Received:2002-01-04 Revised:2002-02-05 Online:2002-07-30 Published:2002-07-30
  • Contact: ZHOU Ping-kun

摘要: 目的: 研究 2粒子诱发人支气管上皮细胞 BEP2D 恶性转化中 DNA 修复基因 DNA2PK的结构和表达变化。方法:用反应2单链构象多态性 PCR2SSCP 分析基因编码序列结构变化。结果:癌变细胞中DNA修复基因 Ku70 XRCC26 的编码碱基发生突变 ,第 1 148~1 153 位点由 AGGATC突变为 GAGTAC,致使编码的α氨基酸由 RI变为 EY;细胞恶性转化过程中 ,DNA修复基因DNA2PKcs XRCC27 的表达发生改变 ,在恶性转化早期即 2粒子照射后第 21 代就已被抑制 ,但发生癌变 第 35 代 后 ,部分细胞克隆的该基因表达又重新上调。结论:DNA修复基因 DNA2PKα 的结构和表达的变化 ,导致细胞DNA修复能力缺陷 ,基因组不稳定性增加 ,是 2粒子癌变的分子机制之一。

关键词: 人支气管上皮细胞BEP2D, α-粒子, 癌变, DNA 依赖蛋白激酶(DNA2PK), DNA 修复

Abstract: Purpose : To detect the mutations and expression changes of DNA-PK genes in the t ransformed human bronchial epithelial cells (BEP2D) induced by α-particles. Methods : Mutations were detected with PCRSSCP ; gene expression was analyzed using Northern blot hybridization. Results : Mutations in the encoding sequence of Ku70 (XRCC-6) gene were discovered in the malignant transformed cells. In the process of α-particle induced BEP2D transformation , the expression of DNA2PKcs gene was depressed at the early stage of t ransformation , and was up2regulated again in some of the malignant t ransformant s. Conclusion : The mutations and depressed expression of DNA repair genes lead to the deficiency of DNA DSBs repair capacity , which in turn might result in genomic instability. These events could play an important role in the malignant transformation of BEP2D cells induced byα-particles exposure.

Key words: human bronchial epithelial cell line BEP2D, α-particles, carcinogenesis, DNA2PK genes, DNA repair

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