Objective: To investigate the effect and mechanism of Polyphyllin Ⅱ on the proliferation, invasion and chemosensitivity of glioma cells. Method: CCK-8 cell proliferation assays and Transwell assays were employed to determine the effect of Polyphyllin Ⅱ on the proliferation and invasion of glioma cells (T98G and LN18), respectively. The expression of E-cadherin, Snail and O6-methylguanine DNA methyltranferase (MGMT) were quantified by Western blot analysis. Results: Polyphyllin Ⅱ could inhibit the proliferation of glioma cells in a time- and does-dependent manner. The half maximal inhibitory concentration (IC(50)) of T98G at 24 h, 48 h and 72 h were (5.82±0.32), (3.57±0.07) and (1.48±0.35) µmol/L, respectively. The IC(50) of LN18 at 24 h, 48 h and 72 h were (6.83±0.11), (4.28±0.29), (2.66±0.22) µmol/L, respectively. After being treated with 2 µmol/L, 4 µmol/L and 6 µmol/L Polyphyllin Ⅱ for 24 h, the percentage of invasive cell area in the chamber area was lower than those in T98G and LN18 control groups (P<0.05). Western blot analysis showed that compared with glioma cells without Polyphyllin Ⅱ treatment, the expression of E-cadherin in T98G and LN18 was higher (F=85.56, P<0.05; F=60.80, P<0.05), but the expression of snail was lower (F=25.34, P<0.05; F=48.28, P<0.05). When temozolomide was used in combination with Polyphyllin Ⅱ at different concentrations, the coefficient of drug interaction (CDI) was less than 1. Western blot showed that MGMT expressions in T98G and LN18 were inhibited compared with glioma cells without Polyphyllin Ⅱ treatment (F=40.38, P<0.05; F=48.44, P<0.05). Conclusion: Polyphyllin Ⅱ can inhibit the proliferation and invasion of glioma cells, and improve its sensitivity to Temozolomide.
目的： 探究重楼皂苷Ⅱ对胶质瘤增殖，侵袭及耐药性的作用及机制。 方法： CCk-8法检测不同浓度重楼皂苷Ⅱ对胶质瘤细胞系T98G和LN18增殖的影响。Transwell小室实验检测不同浓度重楼皂苷Ⅱ对胶质瘤细胞系T98G和LN18侵袭能力的影响。Western印迹法检测E-cadherin、Snail和O6-甲基鸟嘌呤-DNA甲基转移酶（MGMT）表达。 结果： 重楼皂苷Ⅱ能抑制胶质瘤细胞系T98G和LN18的增殖，且随着浓度的增加和时间的延长抑制作用更强。T98G 24、48和72 h的IC(50)分别为（5.82±0.32）、（3.57±0.07）、（1.48±0.35）µmol/L。LN18 24、48和72 h的IC(50)分别为（6.83±0.11）、（4.28±0.29）、（2.66±0.22）µmol/L。T98G和LN18分别以2、4和6 µmol/L重楼皂苷Ⅱ处理24 h后，侵袭细胞面积占小室面积的百分比明显低于T98G和LN18以0 µmol/L重楼皂苷Ⅱ处理24 h后的百分比，差异具有统计学意义（P<0.05）。Western印迹实验检测发现与未经重楼皂苷Ⅱ处理的胶质瘤细胞相比，T98G与LN18中E-cadherin的表达较高（F=85.56，P<0.05；F=60.80，P<0.05），Snail的表达较低（F=25.34，P<0.05；F=48.28，P<0.05）。不同浓度替莫唑胺与重楼皂苷Ⅱ联合使用时，药物相互作用系数（CDI）均<1，Western印迹检测发现与未经重楼皂苷Ⅱ处理的胶质瘤细胞相比，T98G与LN18中MGMT的表达受抑制（F=40.38，P<0.05；F=48.44，P<0.05）。 结论： 重楼皂苷Ⅱ能抑制胶质瘤的增殖、侵袭并提高对替莫唑胺的敏感性。.
Keywords: Glioma; Invasion; Polyphyllin Ⅱ; Temozolomide.