Influence of p53 and p21Waf1 expression on G2/M phase arrest of colorectal carcinoma HCT116 cells to proteasome inhibitors

被引:0
|
作者
Kim, OH
Lim, JH
Woo, KJ
Kim, YH
Jin, IN
Han, ST
Park, JW
Kwon, TK
机构
[1] Keimyung Univ, Sch Med, Dept Immunol, Taegu 700712, South Korea
[2] Kyungpook Univ, Coll Nat Sci, Dept Microbiol, Taegu, South Korea
关键词
MG132; proteasome inhibitor; cell cycle; apoptosis; sodium butyrate;
D O I
暂无
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Ubiquitin-mediated protein degradation in vertebrates has been implicated in cell cycle control. In this report we explored the effects of proteasome inhibitors (MG132, lactacystin and ALLN) on cell cycle distribution. Colorectal carcinoma HCT116 cells were treated with proteasome inhibitor MG132. The results showed that MG132 inhibited cell proliferation in a dose-dependent manner. MG132 arrested HCT116 cells at G2/M phase, which was associated with drug-induced blockade of p53 degradation and/or induction of p53-related gene expression along with the accumulation of cyclin B, cyclin A and p21. MG132 treated HCT116 (wild-type) had a similar cell cycle distribution as the MG132 treated HCT116 (p53-/-) and HCT116 (p21-/-) cells, suggesting that p53 and p21 may not be essential for MG132-induced G2/M phase arrest. The release experiments from nocodazole-induced mitotic phase cells indicated that MG132 inhibits the proliferation of HCT116 cells via arrest in the G2 phase. In addition, when HCT116 cells were exposed to combination of sodium butyrate and MG132 enhanced cell growth inhibition and induction of apoptosis were observed.
引用
收藏
页码:935 / 941
页数:7
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