西洋参有效部位对K562细胞凋亡诱导的实验研究

目的利用人的白血病细胞K562对西洋参有效部位(Panaxquinquefolium’effectiveparts,PQEP)的抗癌作用机制进行研究。方法K562细胞进行常规培养后,利用四甲基偶氮唑盐(MTT)方法进行PQEP(6.25～400mg·L-1)的细胞毒性测试;利用倒置相差显微镜和荧光显微镜(DAPI染色)来观察细胞形态学改变;凝胶电泳法观察细胞凋亡;通过流式细胞仪分析DNA含量和细胞周期分布。结果PQEP对K562细胞有明显细胞毒性,呈时间和剂量依赖关系;PQEP能明显诱导细胞皱缩,膜膨胀和核染色质固缩和碎裂,形成大约为180～200bp或其多聚体组成的寡核苷酸片断;流式细胞仪观察显示PQEP剂量依赖性地提高凋亡细胞DNA含量,阻止细胞在G1期。结论PQEP能够诱导K562细胞发生凋亡。

Induction of apoptosis by Panax quinquefolium effective parts (PQEP) on K562 cells

Aim This research was performed to study the anticancer effects of Panax quinquefolium effective parts (PQEP) in human chronic myeloid leukemia (K562). Method After K562 cells were routinely cultured,MTT assay was performed for cytotoxicity test. Cytotoxicity of PQEP (6.25～400 mg·L -1) in K562 cells was increased in a dose-and time-dependent manner. To explore the mechanism of cytotoxicity, we used several measures of apoptosis to determine whether these processes were involved in PQEP-induced leukemic cell death.Results PQEP induced the cell shrinkage, cell membrane blebbing, chromosomes condensation and DNA fragment. In addition, the flow cytometric analysis revealed PQEP (10～400 mg·L -1) dose-dependently increased apoptotic cells with hypodiploid DNA contents. Conclusion These results indicate that PQEP can control leukemic K562 cells through apoptosis and may have a possibility of potential anticancer activities.