羊栖菜多糖体外抗肿瘤作用及其作用机制的研究

目的 通过体外抗肿瘤实验观察羊栖菜多糖(SFPS)对6种不同组织肿瘤的抑制作用及其对肿瘤治疗的组织特异性，并揭示其作用机制。方法 采用MTT法和集落形成实验法观察SFPS体外抗肿瘤作用；采用流式细胞仪观察SFPS对肿瘤细胞周期及细胞凋亡的影响；采用Fluo-3／AM探针标记，激光共聚焦技术观测细胞内Ca^2 ]i。结果 SFPS对人胃癌细胞SGC-7901和人直肠癌COLO—205有较好的疗效。可阻滞SGC-7901人胃癌细胞由G0／G1期进入S期，升高细胞凋亡指数(APO)。可使SGC-7901细胞内Ca^2 ]i先升高后下降，给CaCl2后Ca^2 ]i又升高。结论 SFPS对人胃癌细胞和直肠癌细胞效果较好，这一作用是通过诱导肿瘤细胞凋亡达到的。SFPS诱导肿瘤细胞凋亡是通过升高肿瘤细胞内Ca^2 ]i达到的。Ca^2 ]i升高时Ca^2 来源于细胞内钙库释放。

Studies on antitumor activities of Sargassum fusiforme polysaccharide in vitro and its mechanism

Object To study the inhibitory effect of Sargassum fusiforme (Harv.) Setch. polysaccharide (SFPS) on six different kinds of tissue tumor by antitumor experiments in vitro, and to observe tissue speciality of tumor treatment and reveal antitumor effect mechanism. Methods MTT and colony forming methods were adopted to study the antitumor activity of SFPS in vitro. Influences of SFPS on cell cycle and apoptosis were observed. LCM was adopted to measure Ca 2+ ]i of the cells marked by Fluo 3/AM probe. Results SFPS had content antitumor activities to SGC 7901 and COLO 205. It prevented the transforming of SCG 7901 from G 0/G 1 period to S period. And it increased the apoptosis index (APO%). Applying SFPS, Ca 2+ ]i increased first and then decreased. Further, after giving CaCl 2, Ca 2+ ]i increased again. Conclusion By inducing the apoptosis of tumor cells, SFPS shows content antitumor activities to SGC 7901 and COLO 205. SFPS could increase the Ca 2+ ]i in SGC 7901. And the Ca 2+ are from cellular storage.