摘要
目的 探讨丹参酮ⅡA(TanⅡA)体外对人胃癌SGC7901细胞自噬的影响及机制.方法 不同浓度(0.5、1、2和4 mg/L) TanⅡA作用体外培养的胃癌SGC7901细胞24、48、72 h后,噻唑蓝(MTT)比色法检测细胞增殖活力的改变;TanⅡA(1、2和4mg/L)作用48 h,流式细胞术检测细胞自噬小体的含量;Western blot检测自噬相关蛋白Beclin-1和微管相关蛋白1轻链3(LC3)-Ⅱ的蛋白的表达水平及磷酸肌醇3激酶(PI3K)-蛋白激酶B(Akt)-雷帕霉素靶蛋白(mTOR)-p70S6激酶1(p70S6K1)的活性.结果 0.5 mg/L TanⅡA对胃癌SGC7901细胞没有明显的生长抑制作用,1、2和4 mg/L TanⅡA对胃癌SGC7901细胞则有明显的生长抑制作用,且抑制作用呈剂量和时间依赖性(P<0.05);流式细胞分析结果显示,1、2和4 mg/L TanⅡA组细胞内酸性自噬小体含量分别为(9.77±1.92)、(13.28 ±2.95)和(16.54±3.28)%,与对照组(4.16±0.64)%比较,差异有统计学意义(P<0.05);Westem blot结果显示,1、2和4 mg/L TanⅡA作用后胃癌SGC7901细胞中Beclin-1的相对表达量为0.62±0.12、0.71±0.11和0.85±0.13,与对照组(0.37±0.05)比较,差异有统计学意义(P<0.05);1、2和4 mg/L TanⅡA作用后胃癌SGC7901细胞中LC3-Ⅱ的相对表达量为0.48±0.06、0.65 ±0.11和0.86 ±0.14,与对照组(0.31±0.03)比较,差异有统计学意义(P<0.05);此外,1、2和4 mg/L TanⅡA作用后胃癌SGC7901细胞PI3K-Akt-mTOR-p70S6K1活性则下降(P<0.05).结论 TanⅡA可通过抑制PI3 K-Akt-mTOR-p70S6K1信号通路促进人胃癌SGC7901细胞自噬.
Objective To investigate the effects of Tanshinone Ⅱ A (Tan Ⅱ A) on the autophagy of gastric cancer cell SGC7901.Methods SGC7901 cells were cultured in vitro.After treatment with different concentrations (0.5,1,2,and 4 mg/L) of Tan Ⅱ A for different durations (24,48,and 72 h),methyl thiazol tetrazolium (MTT) assay was used to detect the cell proliferation.After treatment with different concentrations (1,2,and 4 mg/L) of Tan lⅡ A for 48 h,the content of acidic vesicular organelles (AVOs) was examined by using flow cytometry (FCM).The expression of autophagy-associated protein Beclin-1 and microtubule-associated protein 1 light chain 3 (LC3)-Ⅱ,as well as phosphatidylinositol 3 kinase (PI3K)-protein kinase B (Akt)-mammalian target of rapamycin (mTOR)-p70S6K1 signaling pathways were detected by using Western blotting.Results Tan Ⅱ A (0.5 mg/L) had no significant effect on proliferation of SGC7901 cells compared to dimethylsurfoxide (DMSO) group (P >0.05).Tan Ⅱ A showed a dose-and time-dependent growth inhibition when the concentration above 1 mg/L (P < 0.05).As compared with DMSO group [(4.16 ± 0.64)%],the content of AVOs was significantly increased in 1 mg/L Tan Ⅱ A group [(9.77 ± 1.92) %],2 mg/L Tan Ⅱ A group [(13.28 ± 2.95) %],and 4 mg/L Tan Ⅱ A group [(16.54 ± 3.28) %] (P < 0.05).The protein levels of Beclinl and LC3-Ⅱ were significantly higher in TanⅡAgroup [(0.62±0.12),(0.71±0.11),and (0.85 ±0.13) vs.(0.37±0.05) for Beclinl,P<0.05; (0.48±0.06),(0.65±0.11),and (0.86±0.14) vs.(0.31 ±0.03) for LC3-Ⅱ,P <0.05].In addition,Tan Ⅱ A decreased the phospho-Akt,phospho-mTOR,and phospho-p70S6K1 (P < 0.05).Conclusion Tan ⅡA induces the auophagy of human gastric cancer SGC7901 cells via blocking PI3K-Akt-mTOR-p70S6K1 in vitro.
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2013年第10期2098-2100,共3页
Chinese Journal of Experimental Surgery
关键词
丹参酮ⅡA
胃癌
自噬
磷酸肌醇3激酶
Tanshinone Ⅱ A
Gastric cancer
Autophagy
Phosphatidylinositol 3 kinase