摘要
为了探讨丙戊酸(valproic acid,VPA)对白血病HL-60细胞诱导凋亡的作用及其可能的机制,采用细胞毒性试验(CCK-8法)观察不同浓度VPA在不同作用时间对HL-60细胞增殖的影响,采用荧光显微镜检及流式细胞术检测细胞凋亡,并观察VPA作用后HL-60细胞端粒酶亚单位h-tert基因、凋亡相关蛋白表达和caspase-3活性的变化。结果表明:VPA呈剂量依赖性抑制HL-60细胞增殖(r=-0.87).,诱导细胞凋亡;同时,抗凋亡蛋白BCL-2表达明显下降,促凋亡蛋白BAX表达上调,caspase-3活性增强,h-tert mRNA表达逐渐下降,HL-60细胞的凋亡率与h-tert mRNA表达呈负相关。结论:VPA可抑制白血病HL-60细胞增殖,诱导细胞凋亡;VPA可能通过下调h-tert mRNA、BCL-2蛋白表达,上调BAX表达及增强caspase-3活性而发挥抗白血病作用。
This study was aimed to clarify whether valproic acid （VPA） induces apoptosis of leukemia HL-60 cell line and its possible mechanism. The effect of different concentrations and treatment time of VPA on HL-60 cell proliferation was assayed by cytotoxicity test （CCK-8 method） and fluorescence microscopy,and flow cytometry was used to detect cell apoptosis. The expressions of telomerase subunit h-tert mRNA and apoptosis-related protein as well as caspase-3 activity were detected by real time-quantitive PCR,Western blot and ELISA respectively. The results indicated that VPA inhibited proliferation of HL-60 cells and induced cell apoptosis in a dose dependent manner （r=-0.87）. The expressions of anti-apoptotic protein BCL-2 and h-tert mRNA were significantly decreased while the pro-apoptotic protein BAX and caspase-3 activity increased after treatment with VPA. The apoptosis rate of HL-60 cell was negatively correlated with expression of h-tert mRNA. It is concluded that VPA can inhibit leukemia HL-60 cell proliferation and induce apoptosis. The VPA displays anti-leukemia activity possibly through reducing h-tert mRNA and BCL-2 protein expression,increasing BAX expression and activity of caspase-3.
出处
《中国实验血液学杂志》
CAS
CSCD
2010年第6期1445-1450,共6页
Journal of Experimental Hematology
基金
广东省自然科学基金资助(编号9151008901000105)
广东省科技计划项目资助(编号2008B060600032)
