血根碱通过调控STUB1/GPX4诱导直肠癌细胞发生铁死亡

Sanguinarine induces ferroptosis of colorectal cancer cells by upregulating STUB1 and downregulating GPX4

目的探究血根碱(SAN)对结直肠癌细胞增殖及铁死亡的影响。方法SW620和HCT-116细胞体外培养,在SW620细胞加入浓度分别为0、0.5、1、1.5、2、2.5、3μmol/L的SAN,HCT-116细胞加入0、0.5、0.75、1、1.25、1.5、1.75、2μmol/L的SAN。采用CCK8法检测检测细胞活力,并计算出IC50;检测SAN对细胞的增殖抑制作用采用集落克隆实验;Transwell实验观测SAN对细胞侵袭迁移力的影响;ROS检测试剂盒通过流式细胞仪分析细胞ROS含量的变化;丙二醛(MDA)检测盒来检测脂质过氧化物的产生。氧化型谷胱甘肽/还原型谷胱甘肽定量试剂盒测定谷胱甘肽(GSH)水平。Western blotting法检测铁死亡相关蛋白(STUB1、GPX4)的表达。结果CCK8、集落克隆的结果显示,SAN可显著抑制SW620和HCT-116细胞增殖(P<0.05);Transwell实验结果显示,SAN可抑制SW620和HCT-116细胞侵袭迁移能力(P<0.05);流式细胞术检测显示:SAN显著促进SW620和HCT-116细胞内ROS的产生(P<0.05);MDA检测结果显示,SAN可使SW620和HCT-116细胞内MDA含量增加(P<0.05);GSH检测结果显示,SAN使SW620和HCT-116细胞内GSH下降(P<0.05);Western blotting结果显示,SAN可通过调控STUB1下游蛋白GPX4的下调(P<0.05)。结论SAN可通过调节STUB1/GPX4诱导结直肠癌细胞发生依赖性铁死亡,提供了新治疗结直肠癌的靶点以及实验依据。

Objective To investigate the effect of sanguinarine(SAN)on proliferation and ferroptosis of colorectal cancer cells.Methods SW620 and HCT-116 cells treated with different concentrations of SAN were examined for cell viability changes using CCK8 assay to determine the IC50 of SAN in the two cells.The inhibitory effects of SAN on proliferation,invasion and migration of the cells were evaluated using colony-forming assay and Transwell assays.ROS production in the treated cells was analyzed with flow cytometry,and lipid peroxide production was assessed by detecting malondialdehyde(MDA)level.Glutathione(GSH)levels in the cells were detected,and Western blotting was used to detect the expressions of ferroptosisrelated proteins STUB1 and GPX4.Results SAN significantly inhibited the proliferation,invasion and migration of SW620 and HCT-116 cells.SAN treatment significantly promoted ROS production,increased intracellular MDA level,and lowered GSH level in the two cells(P<0.05).Western blotting showed that SAN significantly upregulated the expression of STUB1 and downregulated the expression of its downstream protein GPX4(P<0.05).Conclusion SAN induces ferroptosis in colorectal cancer cells by regulating STUB1/GPX4,which may serve as a new therapeutic target for colorectal cancer.