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三氧化二砷对膀胱癌T24细胞Apaf-1基因表达的影响

孙军培1,刘久华2,*,顾 恒1,黄峻松1,张明聪2   

  1. ( 1. 中国人民解放军第123医院泌尿外科,安徽 蚌埠 233000;2. 蚌埠医学院附属连云港市第二人民医院东院区泌尿外科,江苏 连云港 222006 )
  • 收稿日期:2013-03-27 修回日期:2013-05-30 出版日期:2013-09-30 发布日期:2013-09-30
  • 通讯作者: 刘久华,E-mail:liujhdoctor@sina.com
  • 作者简介:孙军培 (1985- ),男,安徽省蚌埠市人,硕士,研究方向:泌尿系统肿瘤。E-mail:sjpjiand@163.com

Effect of arsenic trioxide on Apaf-1 gene expression in bladder cancer T24 cells

SUN Jun-pei1LIU Jiu-hua2,*,GU Heng1,HUANG Jun-song1,ZHANG Ming-cong2   

  1. (1. Department of Urology, The 123rd Central Hospital of People's Liberation Army of China, Bengbu 233000, Anhui; 2. Department of Urology, Eastern Hospital of Bengbu Medical College Affiliated Lianyungang City Second People's Hospital, Lianyungang 222006, Jiangsu, China)
  • Received:2013-03-27 Revised:2013-05-30 Online:2013-09-30 Published:2013-09-30
  • Contact: LIU Jiu-hua,E-mail:liujhdoctor@sina.com

摘要:

目的:观察三氧化二砷 (arsenic trioxide,As2O3)对人膀胱癌T24细胞增殖及凋亡蛋白酶活化因子-1 (apoptotic protease activating factor-1,Apaf-1)基因表达的影响。方法:取处于对数生长期的T24细胞,用0.25%胰酶消化成细胞密度为1×105/mL的单细胞悬液,再用含有不同浓度 (0、1、2、4、8 μmol/L)As2O3的培养基作为药物组,并设置空白对照组,置于培养箱中分别培养24、48和72 h后,用二甲基四氮唑蓝 (MTT)法检测As2O3对T24细胞的增殖抑制率;取T24细胞在不同浓度 (0、1、2、4、8 μmol/L)的As2O3培养液中培养72 h后用脱氧核糖核酸原位末端转移酶标记技术 (TUNEL)法检测细胞凋亡,用RT-PCR及Western blotting检测As2O3 对Apaf-1 mRNA和蛋白表达的影响。结果:与对照组相比,2、4、8 μmol/L As2O3剂量组能有效抑制T24细胞增殖,且具有剂量-反应关系 (24 h时r=-0.962,P=0.038;48 h时r =-0.959,P=0.041;72 h时r=-0.973,P=0.027)。As2O3于1~8 μmol/L作用72 h时细胞出现典型的凋亡变化,具有剂量-反应关系 (r=0.993,P =0.007);同时Apaf-1 mRNA和蛋白的表达均明显增强,且具有剂量-反应关系 (mRNA:r=0.986,P=0.014;蛋白:r=0.989,P=0.000)。结论:As2O3能够有效抑制膀胱癌T24细胞生长、增殖并诱导其凋亡,机制可能与其上调Apaf-1基因的表达有关。

关键词: 三氧化二砷, Apaf-1, 细胞凋亡, 膀胱肿瘤

Abstract:

OBJECTIVE: To observe the effects of arsenic trioxide (As2O3) on human bladder cancer T24 cell proliferation and apoptosis protease activating factor-1 (Apaf-1) gene expression. METHODST24 cells in the logarithmic growth phase,were digested with 0.25% trypsin into a cell density of 1×105/mL single cell suspension. Then cells were inculated with different concentrations (0,1,2,4,8 μmol/L) of As2O3,as well as blank control group for 24,48 and 72 h. Cell proliferation inhibition rate was evaluated by MTT. After cell treatment with As2O3 (0,1,2,4,8 μmol/L) for 72 h,deoxyribose situ terminal transferase labeling (TUNEL) method was used to measure apoptosis;RT-PCR and Western blotting to assess the impact of As2O3 on Apaf-1 mRNA and protein expression. RESULTS:Compared with the control group, the 2,4,8 μmol/L As2O3 dose groups could effectively inhibit the proliferation of T24 cells in a concentration-dependent manner (24 h,r =0.962,P=0.038;48 h,r =0.959,P=0.041;72 h,r =0.973,P=0.027). Cells treated with As2O3 at 1-8 μmol/L for 72 h, showed typical apoptotic changes in a concentration-dependent manner (r= 0.993,P=0.007); whilst Apaf-1 mRNA and protein expressions were also significantly increased in a concentration-dependent (mRNA,r =0.986,P=0.014;protein,r =0.989, P=0.000). CONCLUSION:As2O3 could effectively inhibit bladder cancer T24 cell growth,proliferation and induce apoptosis. The possible mechanism may be related to increased Apaf-1 gene expression.

Key words: arsenic trioxide, apoptotic protease activating factor-1, apoptosis, bladder tumor