花椒毒素通过死亡受体途径诱导胃癌SGC-7901细胞凋亡

目的 研究伞形科药用植物花椒毒素对细胞增殖和凋亡的影响,并探究其对人胃癌SGC-7901细胞的体外作用机制。方法 用不同浓度的花椒毒素（10,20,60,80,100,120,140和160μg/ mL）处理SGC-7901,HepG-2,MCF-7和A549细胞48h,用MTT法测定细胞活力（IC 50）;用Hoechst 33258染色试剂盒和Annexin V-FITC凋亡检测试剂盒观察花椒毒素诱导的细胞凋亡;流式细胞术检测花椒毒素处理后人胃癌SGC-7901细胞凋亡相关蛋白Fas / FasL,Bid和DR5 / TRAIL; 通过Flouormetric Assay Kit测定花椒毒素对细胞中Caspase-8蛋白表达的影响。结果 花椒毒素明显抑制SGC-7901,HepG-2,MCF-7和A549细胞增殖,其抑制作用呈浓度依赖性;;流式细胞术结果显示,在一定浓度范围内,黄嘌呤毒素可以以浓度依赖性方式增加Fas / FasL和DR5 / TRAIL蛋白的表达水平。 细胞中Bid蛋白含量增加,且表现出浓度依赖性。结论 花椒毒素可通过Fas / FasL蛋白介导的死亡受体途径或DR5 / TRAIL介导的死亡受体途径在一定浓度范围内诱导SGC-7901细胞凋亡,并增加死亡受体蛋白的表达水平,激活Caspase-8,激活下游影响因子,诱导细胞凋亡,或激活Caspase-8切割蛋白Bid,然后进入线粒体途径,诱导细胞凋亡。

Xanthotoxin induces apoptosis in SGC-7901 cells through death receptor pathway

Objective

To investigate the effects of xanthotoxin from Apiaceae medicinal plants on cell proliferation and apoptosis, and explore its mechanism of action against human gastric carcinoma SGC-7901 cells in vitro.

Methods

SGC-7901, HepG-2, MCF-7, and A549 cells were treated with different concentrations of xanthotoxin (10, 20, 60, 80, 100, 120, 140, and 160?µg/mL) for 48?h, and the cell viability (IC₅₀) was determined by MTT assay; Xanthotoxin-induced apoptosis in cells was observed by using Hoechst 33258 Staining Kit and Annexin V-FITC Apoptosis Detection Kit; Flow cytometry was used to detect apoptosis related proteins of Fas/FasL, Bid, and DR5/TRAIL proteins in human gastric carcinoma SGC-7901 cells after being treated by xanthotoxin; The influence of xanthotoxin on Caspase-8 protein expression in the cells was determined by Flouormetric Assay Kit.

Results

Xanthotoxin obviously inhibited SGC-7901, HepG-2, MCF-7, and A549 cells proliferation, and its inhibition was in a concentration-dependent manner; flow cytometry results showed that in a certain concentration range, xanthotoxin can increase the expression levels of Fas/FasL and DR5/TRAIL proteins in a concentration-dependence manner. The content of Bid protein in cells was increased, and it showed concentration-dependence.

Conclusion

Xanthotoxin may induce SGC-7901 cells apoptosis in a certain concentration range through the Fas/FasL protein mediated death receptor pathway, or by DR5/TRAIL mediated death receptor pathway, and increase the expression level of death receptor protein, activation Caspase-8, activating downstream effect factor, inducing cell apoptosis, or activate Caspase-8 cutting activate protein Bid, and then enter the mitochondrial pathway, induction of apoptosis.