Beclin-1基因沉默对蛇六谷提取物损伤胃癌SGC-7901细胞的影响

目的:探讨beclin-1基因沉默对蛇六谷提取物损伤人胃癌SGC-7901细胞的影响。方法:采用携带beclin-1-shRNA的慢病毒载体感染胃癌SGC-7901细胞,敲减beclin-1基因表达;蛇六谷提取物处理beclin-1基因敲减和未敲减的SGC-7901细胞,CCK-8法检测细胞活力,流式细胞术分析细胞凋亡率,Western blot检测beclin-1和LC3的蛋白表达水平。结果:Beclin-1-shRNA转染SGC-7901细胞抑制beclin-1的mRNA和蛋白表达,促进LC3蛋白表达,降低细胞活力,增加细胞凋亡率(P0.05);蛇六谷提取物上调SGC-7901细胞的beclin-1和LC3蛋白表达,但下调beclin-1基因敲减的SGC-7901细胞的LC3蛋白表达,并显著降低细胞活力和增加细胞凋亡率(P0.05)。结论:Beclin-1基因沉默阻断蛇六谷提取物对beclin-1相关信号通路的激活,增强蛇六谷提取物对胃癌SGC-7901细胞活力的损伤作用。

Effect of beclin-1 gene silencing on TuAKe-injured gastric cancer SGC-7901 cells

AIM: To observe the effect of beclin-1 silencing by the technique of RNA interference on the injury of human gastric cancer SGC-7901 cell by Sheliugu extract (the extract from tuber of Amorphophallus konjac, TuAKe). METHODS: To knock down the expression of beclin-1 gene, SGC-7901 cells were transfected with lentiviral vector carrying beclin-1-shRNA. The beclin-1 gene knock-down and non-knock-down SGC-7901 cells were treated with TuAKe. The cell viability was analyzed by CKK-8 assay. The percentages of apoptotic cells were detected by flow cytometry. The expression of beclin-1 and LC3 was detected by Western blot. RESULTS: The beclin-1 gene silencing decreased the protein expression of beclin-1 and increased the protein expression of LC3 in the SGC-7901 cells, leading to the decrease in cell viability and the increase in apoptotic rate (P<0.05). TuAKe increased the protein expression of beclin-1 and LC3 in the SGC-7901 cells, and decreased the protein expression of LC3 in the SGC-7901 cells with beclin-1 gene silencing, thus inhibiting the cell viability and increasing the apoptotic rate (P<0.05). CONCLUSION: Beclin-1 gene silencing inhibits the activation of beclin-1-related signaling pathway in gastric cancer SGC-7901 cells, and aggravates the injury of cell viability induced by TuAKe.