癌变·畸变·突变 ›› 2009, Vol. 21 ›› Issue (2): 123-126.doi: 10.3969/j.issn.1004-616x.2009.02.011

• 论著 • 上一篇    下一篇

氯化铈单独及与射线联合作用对K562细胞凋亡的影响及其机制研究

郝述霞,王春燕,吕慧敏   

  1. 中国疾病预防控制中心辐射防护与核安全医学所,北京 100088
  • 收稿日期:2008-06-18 修回日期:2008-09-10 出版日期:2009-03-30 发布日期:2009-03-30

Pilot Study of Apoptosis and Mechanism of K562 Cells Exposed to Cerium Chloride and Cerium Chloride Combined with Gamma Radiation

HAO Shu-xia,WANG Chun-yan,LU Hui-min   

  1. National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
  • Received:2008-06-18 Revised:2008-09-10 Online:2009-03-30 Published:2009-03-30

摘要: 背景与目的: 探讨氯化铈(CeCl3)单独及与60Co γ射线联合作用对K562细胞凋亡的影响及其可能机制。 材料与方法: 以K562细胞为研究对象,分为对照组、CeCl3组、60Co γ射线组及CeCl3与射线联合作用组,观察CeCl3单独及与射线联合作用对细胞凋亡的影响。采用流式细胞仪检测细胞凋亡和细胞周期的变化,应用Western blot检测凋亡相关蛋白Bcl-2、Bax的表达情况。 结果: 与对照组相比较,CeCl3单独作用26 h、γ射线及CeCl3与γ射线联合作用均可以显著诱导K562细胞凋亡(P<0.05),γ射线、CeCl3单独作用组及CeCl3与γ射线联合可引起K562细胞S期细胞比例较对照组明显减少(P<0.05或P<0.01);同时γ射线组及CeCl3与γ射线联合组的G2/M期细胞较对照组明显阻滞(P均<0.01);CeCl3组、γ射线组及CeCl3与γ射线联合组的Bcl-2/Bax比值较正常对照组降低。 结论: CeCl3单独及与γ射线联合作用可以诱导K562肿瘤细胞凋亡,其诱导凋亡机制主要是通过线粒体途径。联合组的凋亡可能还与细胞周期阻滞有关。

关键词: K562, 凋亡, Bcl-2/Bax, 细胞周期

Abstract: K562; 凋亡; Bcl-2/Bax; 细胞周期BACKGROUND AND AIM: To investigate the apoptotic effect and mechanism of K562 cells exposed to cerium chloride(CeCl3) and CeCl3 combined with gamma radiation. MATERIALS AND METHODS: Apoptosis and cell cycle of K562 cells were examined using flow cytometry and expressions of Bcl-2 and Bax were assessed with Western blot. RESULTS: Compared with control,CeCl3 exposure for 26 h ,gamma irradiation,and both combined could induce apoptosis of K562 cells(P<0.05).The cells in S phase were reduced in CeCl3 group(P<0.05), in irradiation and combined treatment group also(P<0.01). The cell cycle was blocked in G2/M phase in irradiation group and combined treatment group compared with control. The Bcl-2/Bax ratio in all 3 groups were lower than control. CONCLUSION: CeCl3 and CeCl3 combined with gamma radiation induced K562 cells apoptosis via mitochondrial-mediated apoptosis pathway. The apoptosis of the combined treatment group was perhaps related to the block of cell cycle in G2/M phase.

Key words: K562, apoptosis, Bcl-2/Bax, cell cycle