澳洲茄碱诱导肺癌细胞株H446凋亡及其机制探讨

Solasonine-induced Apoptosis in Lung Cancer Cell Line H446 and Its Mechanism

背景与目的肺癌的发病率和病死率都急剧上升,小细胞肺癌首选化疗而不能手术,而中医药副作用小,有研究表明中药澳洲茄碱具有抗肿瘤活性作用。本研究旨在探讨澳洲茄碱对肺癌细胞株H446凋亡作用的影响。方法用CCK8试剂盒筛选药物作用的合适浓度和时间,以药物浓度为0μmol/L、3.4μmol/L、6.8μmol/L、13.6μmol/L分4组,作用于H446细胞24 h后,倒置显微镜观察细胞形态的变化,DAPI核染观察细胞核变化,流式细胞术检测药物对细胞凋亡的影响,Western blot检测凋亡相关蛋白BCL2、BAX、CASP3表达的变化。结果澳洲茄碱可降低H446细胞的存活率,抑制其增殖,具有剂量相关性,存活率可降低至16.77%(P<0.001),最高凋亡率为44.62%(P<0.001);H446有明显的细胞凋亡形态学变化;Western blot显示凋亡相关蛋白BAX、CASP3表达上调(P<0.05),凋亡抑制基因蛋白BCL2表达下调(P<0.05)。结论澳洲茄碱可抑制H446细胞的增殖,上调促凋亡相关蛋白表达,下调抑凋亡蛋白表达,从而促进细胞的凋亡。

Background and objective Incidence and mortality rates of lung cancer are rising sharply. Small cell lung cancer patients prefer chemotherapy than surgery because of the insignificant side effects of Chinese medicine. Studies have shown that solasonine possesses an anti-tumor property. The aim of this study is to investigate the effect of solasonine on the apoptosis of lung cancer cellline H446. Methods Appropriate concentration and time were selected with a CCK8 kit. The drug that was used in H446 cells was divided into four different concentrations： 0 μmaol/L, 3.4 μmol/L, 6.8 μmol/L and 13.6 μmol/L. The changes in forms and nucleus ofH446 cells that were stained with DAPI were observed under an inverted optical microscope. The effects on H446 cell apoptosis were detected by FCM. The changes in apoptosis-related proteins BCL2, BAX, and CASP3 were investigated using Western blot for 24 h. Results Solasonine reduced the survival ratio ofH446 ceils and inhibited the proliferation with a dose-related effect. The survival ratio of H446 ceils could be reduced to 16.77% （P〈0.001）, and the highest apoptosis ratio was 44.62% （P〈0.001）. Apoptosis was observed in H446 cells. Moreover, Western blot showed that the apoptosis-related proteins BAX and CASP3 were upregulated （P〈0.0S）. Conclusion The proliferation ofH446 cells can be inhibited by solasonine, and the expression of pro-apoptotic proteins is up-regulated, and the expression of anti-apoptotic proteins is down-regulated, thereby promoting the apoptosis of cells.