三七总甙对多种肿瘤细胞的生长均有抑制作用,但从三七茎叶、花梗、果梗提取到的达玛烷20(S)-原人参二醇型皂苷(20(S)-PPDS)对肺癌A549细胞的作用及机理尚不清楚.本研究采用噻唑蓝(MTF),Ho—echst33258染色,免疫组化以及Westernblot法研究20(S)-PPDS对肺癌A549细胞的作用.结果显示20(S)-PPDS对A549细胞的具有抑制作用,125,250,500μg·mL-1的20(S)-PPDS与A549细胞作用72h后,细胞抑制率依次为28.67%,41.97%,73.02%;20(S)-PPDS对A549细胞作用24,72h的Ic50分别为398.94,315.96μg·mL-1;20(s)-PPDS通过活化Caspase-3,上调Bax蛋白表达,下调Pro—Caspase-3、Bcl-2蛋白表达诱导A549细胞凋亡.这些研究结果表明20(S)-PPDS对A549细胞具有抑制细胞增殖和诱导细胞凋亡的作用.
Panax notogingseng saponins inhibits the growth of several cancer cell lines, but the inhibition of 20 ( S ) - protopanaxadiol saponins ( 20 (S) - PPDS) , an aqueous extraction group from stem, leaves, pedicel, and fruit stem of Pannax notoginseng, on the proliferation of lung adenocarcinoma cell line A549 and its possible mo- lecular mechanism is not clear. After treating A549 cells with 20 (S) - PPDS, we detected the effects of 20 (S) - PPDS on A549 cells by MTT assay,immunohistochemistry, Hoechst33258 staining, and Westem blot. The results showed that 20(S) -PPDS inhibited the growth of A549 cells. When treated with 125,250 and 500 μg mL-1 of 20 (S) - PPDS for 72 h, the inhibitory rates of A549 cells were 28.67%, 41.97%, 73.02% respectively. The 50% inhibition concentration of 20(S) - PPDS were 398.94 and 315.90 μg mL-1 at 24 and 72 h. 20(S) - PPDS induced cell apoptosis through activating Caspase - 3, up - regulating Bax, down - regulating Pro - Caspase - 3 and Bcl - 2 protein expression. Experimental results of this study suggested that 20 (S) - PPDS exerts anti- cancer activity through the growth inhibition and the apoptosis on A549 cells.