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中国临床药理学与治疗学 ›› 2008, Vol. 13 ›› Issue (10): 1134-1138.

• 基础研究 • 上一篇    下一篇

靶向siRNA下调人结直肠癌 Colo320 细胞端粒长度与端粒酶逆转录酶基因表达的研究

黄浩1, 李秀2, 肖宏1, 傅雷1, 余兰才1, 林世和1, 易艳东1   

  1. 1武汉第一医院实验中心, 武汉 430022, 湖北;
    2华中科技大学同济医学院保健科, 武汉 430030, 湖北
  • 收稿日期:2008-06-17 修回日期:2008-09-19 出版日期:2008-10-26 发布日期:2020-10-19
  • 作者简介:黄浩, 男, 博士, 研究方向:病原生物学及肿瘤分子生物学研究。Tel:13971540605  E-mail:whhuanghao10@yahoo .com.cn
  • 基金资助:
    湖北省科技攻关项目(2006AA301B66-3)

siRNA targetgene c-myc downregulates human telomerase reverse tran-scriptase gene and telomere lengths in human colon cancer Colo320 cells

HUANG Hao1, LI Xiu2, XIAO Hong1, FU Lei1, YU Nan-cai1, LIN Shi-he1, YI Yan-dong1   

  1. 1Center of Experimental Medicine, Wuhan First Hospital,Wuhan 430022, Hubei, China;
    2Department of Health,Tongji Medical College, Huazhong University of Science and Technology, Wuhan430030, Hubei, China
  • Received:2008-06-17 Revised:2008-09-19 Online:2008-10-26 Published:2020-10-19

摘要: 目的: 探讨发夹状 shRNA 封阻原癌基因(c-myc) , 抑制癌细胞增殖 、生长的作用。方法: 针对c-myc 的构建发夹状 shRNA 的真核表达质粒, 并转染人结直肠癌 Colo320细胞。荧光定量 RT-PCR检测 c-myc 及细胞端粒酶逆转录酶的 mRNA 的表达,Western-blot 检测 c-myc、端粒酶逆转录酶(hu-man telomerase reverse transeriptase, hTERT) 蛋白表达水平 。Southern blot 检测端粒的长度, PCR-ELISE法检测端粒酶活性。3H-thymidine 实验分析DNA 合成和细胞增殖 。结果: 转染细胞增殖、生长皆受到抑制。同时c-myc 和 hTERT 的 mRNA 和蛋白表达显著下降, 端粒的长度明显缩短, 端粒酶活性降低 。结论: c-myc 的 shRNA 对人结直肠癌Colo320 细胞的生长增殖、端粒长度、端粒酶活性有特异性抑制作用, 并呈剂量依赖关系 。

关键词: c-myc, 小发夹结构 RNA, 增殖, 细胞端粒酶逆转录酶

Abstract: AIM: To study transfected shRNA of c-myc as therapeutic agents into target cell Colo320 which expressed more tolomerase activity to investigate the effect of inhibition on telomerase activity and te-lomere lengths and tumor cell growth. METHODS: A plasmid-based polymerase III promoter system was used to deliver and express short interfering RNA (siRNA) targeting c-myc in Colo320 cells.The c-myc and hu-man telomerase reverse transeriptase (hTERT) mRNA level was monitored by fluorescence real time reverse transcription-polymerase chain reaction, the protein level of c-myc, hTERT were examined by western blot analysis. Meanwhile, telomere lengths and telomerase activity were measured by Southern analysis of telomere restriction fragment (TRF) length and PCR-ELISE. We also assessed the effects of c-myc silencing on tu-mor growth by DNA synthesis (3H-thymidine).RESULTS: The data showed that expression of c-myc and hTERT decreased in shRNA-transfected cells, down-regμlation of c-myc and hTERT inhibited cell growth, reduced cell telomere lengths and telomerase activity . CONCLUSION: shRNA of c-myc had the ability to inhibit telomerase activity and telomere lengths and cell growth and was dose dependent .

Key words: c-myc, small hairpin RNA, prolifera-tion, human telomerase reverse transeriptase

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