癌变·畸变·突变

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Axin通过激活p53的表达抑制结肠癌细胞的生长

陆建荣,丁彩霞,袁  勇,张  娟,蔡  琳   

  1. 陕西省肿瘤医院病理科,陕西  西安  710061
  • 收稿日期:2014-03-06 修回日期:2014-06-05 出版日期:2014-09-30 发布日期:2014-09-30
  • 作者简介:陆建荣(1973- ),男,甘肃省张掖市人,博士,副主任医师,研究方向:肿瘤病理学。Tel: 13032960959;E-mail:lujr535 @126.com
  • 基金资助:

    陕西省自然科学基金项目(2011JM4005)

Axin inhibited the growth of colon cancer cells by activating p53

LU Jian-rong,DING Cai-xia,YUAN Yong,ZHANG Juan,CAI Lin   

  1. Department of Pathology, Shaanxi Cancer Hospital, Xi’an 710061, Shaanxi, China
  • Received:2014-03-06 Revised:2014-06-05 Online:2014-09-30 Published:2014-09-30

摘要:

目的: 观察过表达Axin对结肠癌SW480细胞生长的影响,并探讨其作用机制。方法:将pCMV5-HA-Axin质粒瞬时转染至结肠癌SW480细胞中,并设置转染空载体pCMV5-HA及未转染空白对照组,采用噻唑蓝(MTT)比色法及克隆形成实验检测细胞增殖状态的变化,流式细胞仪检测细胞周期变化;RT-PCR检测Axin及p53 mRNA的表达;Western blot检测Axin及P53蛋白的表达。结果:与转染空载体及空白对照组比较,过表达Axin显著抑制结肠癌SW480细胞的增殖。MTT实验显示转染Axin后细胞生长明显受到抑制,存活的瘤细胞明显减少(P<0.05);克隆形成实验结果显示瞬时转染Axin质粒组细胞集落形成能力明显下降(P<0.05);流式细胞仪分析检测结果显示转染Axin质粒后结肠癌SW480细胞周期G1前期比例升高,G1期明显被阻滞,S期比例下降(P均<0.05)。RT-PCR结果显示转染Axin的SW480细胞中p53 mRNA的表达较转染空载体组升高约1倍(P<0.05);同时,Western blot结果显示转染质粒Axin后结肠癌SW480细胞中P53的蛋白表达量明显增加,较转染空载体组几近升高1倍(P<0.05)。结论:过表达Axin抑制结肠癌SW480细胞增殖,其作用机制是通过激活癌基因p53的表达而发挥效应的。

关键词: 结肠癌, Axin, p53, 细胞增殖, 细胞周期

Abstract:

OBJECTIVE: To investigate the effect of Axin on the biological behavior of SW480 colon cancer cells and to elucidate its molecular mechanism. METHODS:SW480 colon cancer cells were transfered with pCMV5-HA-Axin and pCMV5-HA and blank control group was desigined. Cell proliferation was detected by MTT assay and colony formation assay,and the cell cycle was analyzed by flow-cytometry. At the same time,Real-time PCR and Western blot were used to assess the expressions of Axin and p53 oncogene in SW480 cells. RESULTS:Over-expression of Axin significantly inhibited the growth of SW480 colon cancer cells. MTT assay revealed over-expression of Axin inhibited the proliferation of SW480 cells(P<0.05). Transfection of Axin increased colon cancer SW480 cell cycle pre G1 ratio,inhibited G1 phase and decreased S ratio(P<0.05). p53 mRNA doubled in SW480 cells with transfered pCMV5-HA-Axin(P<0.05). P53 protein was also doubled in SW480 cells with transfered pCMV5-HA-Axin compared with empty vector groups(P<0.05). CONCLUSION:Over-expression of Axin could significantly inhibit the growth of colon cancer cells,and its mechanism might be related to the activation of the p53 oncogene.

Key words: colon cancer, Axin, p53, proliferation, cell cycle