【摘要】 目的研究开口箭皂甙(STCB)体内外抗S-180肉瘤活性的强度及其作用机制。方法MTT法检测S-180细胞的增殖程度;制备昆明种小鼠S-180移植实体瘤模型,观察STCB的抑瘤作用;光镜和电镜下观察药物作用后S-180细胞形态及超微结构变化;以不同浓度STCB处理S-180细胞,经碘化丙啶染色后应用流式细胞术检测细胞周期及细胞凋亡情况。结果STCB体外明显抑制S-180细胞增殖,IC50为34.64μg/ml。经灌胃给药,STCB对荷S-180实体瘤小鼠表现出良好的抑瘤作用,低剂量(0.5g/kg体质量)时,抑瘤率已超过30%,高剂量(2g/kg体质量)时,抑制率达到54.86%。电镜观察和FCM检测证明肿瘤细胞凋亡率随STCB浓度增加而增加。STCB的浓度为10和30μg/ml时,S期细胞百分率上升,G2/M期细胞百分率下降;当STCB的浓度达到60μg/ml,G0/G1期细胞百分率下降,G2/M期细胞百分率上升;提示低浓度STCB阻止S-180细胞从S期进入G2期;高浓度时,STCB还干扰S-180细胞的有丝分裂。结论STCB在体内外对S-180肉瘤细胞均有抑制作用,其作用机制与诱导肿瘤细胞的凋亡和干扰细胞周期有关。更多还原

【Abstract】 Objective To study the antitumor effect of saponin extracted from Tupistra chinensis Baker (STCB) against mouse sarcoma S-180 cell proliferation in vitro and in vivo and explore the primary mechanism of this effect. Methods Cytotoxic effect of STCB on S-180 cells in vitro was evaluated by MTT colorimetry, and its effect against in vitro tumor growth was tested in Kunmin mice bearing S-180 implanted tumor. The morphological and ultrastructural changes of S-180 cells after saponin treatment in vitro were examined with light and transmission electron microscope. Flow cytometry was performed to examine the cell cycle and apoptosis of S180 cells treated with different concentrations of STCB with propidium iodide staining. Results STCB could markedly inhibit S-180 cell proliferation in vitro with 50% inhibitory concentration of 34.64 μg/ml. STCB given by intragastric administration also significantly inhibited the growth of S-180 solid tumor, and the inhibition rate exceeded 30% at the dose of 0.5 g/kg, reaching 54.86% at 2 g/kg. Electron microscopy and flow cytometry revealed increased S180 tumor cell apoptotic rate with the increment of saponin concentration, along with increased percentage of cells in S phase and decreased cells in G2/M phase in response to 10 or 30 μg/ml STCB treatment. At the concentration of 60 μg/ml, however, STCB resulted in an opposite effect on the cell cycles, presumably due to its interference with mitosis at high concentrations. Conclusions STCB inhibits the growth of S-180 cells both in vivo and in vitro possibly by inducing cell apoptosis and interfering with the cell cycle progression of the tumor cells.更多还原