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锌对前列腺癌细胞PC-3M凋亡的影响

刘 瑾,张 灵,李晓萌,许 莉,汲 坤,赵雪俭,李 扬*   

  1. 吉林大学基础医学院病理生理学教研室 吉林大学前列腺疾病防治研究中心,吉林 长春130021
  • 收稿日期:2005-07-15 修回日期:1900-01-01 出版日期:2006-09-28 发布日期:2006-09-28
  • 通讯作者: 李 扬

Effects of zinc on apoptosis of prostate cancer cells

LIU Jin,ZHANG Ling,LI Xiao-meng,XU Li,JI Kun, ZHAO Xue-jian,LI Yang*   

  1. Department of Pathophysiology,School of Basic Medical Sciences, Preventionand Treatment Research Center for Prostate Diseases,Jilin University,Changchun 130021,China
  • Received:2005-07-15 Revised:1900-01-01 Online:2006-09-28 Published:2006-09-28
  • Contact: LI Yang

摘要: 目的:探讨锌对前列腺癌细胞PC-3M凋亡的影响。方法:分别选用不同浓度ZnSO4•7H2O(终浓度分别为6.25、15、25、50、100、150、200、250及300 μmol•L-1)作用于PC-3M细胞24 h,用MTT法筛选对PC-3M细胞增殖抑制的有效浓度,利用吖啶橙/溴化乙锭染色、DNA ladder及流式细胞术检测PC-3M细胞凋亡情况。结果:MTT显示,锌的浓度在250 μmol•L-1时, PC-3M细胞存活率显著低于对照组(P<0.01)。Zn2+浓度达250 μmol•L-1时,相差显微镜下细胞形态变化明显,细胞变长,并伸出较长的突起,细胞分裂相明显减少,细胞数量较对照组明显减少。吖啶橙/溴化乙锭染色显示,对照组细胞形态为规则的圆形,细胞膜光滑无皱缩和发泡,呈现均匀的绿色,偶可见橙色细胞(自然凋亡细胞);Zn2+(250 μmol•L-1)作用后,相差显微镜下可观察到较多早期凋亡细胞,细胞多为圆形,但细胞膜较对照组粗糙,细胞呈绿色,细胞核中有鲜绿色的斑点;也可观察到较多的晚期凋亡细胞,细胞形状不规则,细胞膜粗糙,有较多突起,被吖啶橙染成橙色,细胞中有鲜亮的橙色斑点。DNA ladder可见梯形条带出现;流式细胞术显示亚二倍体峰的出现,细胞凋亡率为13.3%。上述各项指标均显示PC-3M细胞的凋亡水平明显高于对照组(P<0.05)。结论:高Zn2+可以抑制前列腺癌细胞生长并诱导前列腺癌细胞凋亡。

关键词: PC-3M细胞, 细胞凋亡

Abstract: Objective To investigate the effects of zinc on apoptosis of prostate cancer cells(PC-3M). Methods The cell proliferation was determined by MTT assay treated with different concentrations of ZnSO4•7H2O(end concentrations were 6.25,15,25,50,100,150,200,250,and 300 μmol•L-1,respectively), the cell morphological changes after exposed to zinc for 24 h was observed under phase-contrast microscope, the apoptosis was detected by AO/EB assay, the cell cycle and apoptotic peak were detected by flow cytometry, DNA fragmentation was observed by agarose gel electrophoresis(AGE).Results PC-3M cells proliferation rate was obviously changedafter exposed to different levels of zinc for 24 h. Zinc(250 μmol•L-1) inhibited proliferation of PC-3M cells (P<0.01). Compared with control cells, the changes of morphological characteristics of PC-3M cells were found,including shrank and floated,decreased refraction in the cells exposed tozinc (250 μmol•L-1) for 24 h. The confocal microscopy showed the changes of cells through AO/EB staining.The cellular membrane was integrity but vacuolization of the cytoplasm,chromatin was flavo-green, nuclear condensed, nuclear side collection, caryolysis, nuclear fragmented. The flow cytometry showed the hypodip-loid peak in G0/G1 phase after exposed to zinc (250μmol•L-1)for 24 h. It had visible DNA fragmentation by AGE.Conclusion Zinc with high concentrationcan inhibit human prostate cancer cell growth and induce apoptosis of human prostate cancer cells.

Key words: PC-3M, apoptosis 

中图分类号: 

  • O614.241