芒柄花素诱导人乳腺癌MCF-7细胞凋亡及其氧化应激的机制
Mechanism of apoptosis and oxidative stress in MCF-7 cells induced by formononetin
作者:贾绍华,刘丽娜,颜廷华
Author:
收稿日期: 年卷(期)页码:2020,35(04):-385-391
期刊名称:华西药学杂志
Journal Name:WEST CHINA JOURNAL OF PHARMACEUTICAL SCIENCES
关键字:芒柄花素;人乳腺癌MCF-7细胞;增殖抑制;凋亡;氧化应激;活性氧;c-Jun氨基末端激酶;抗肿瘤;作用机制
Key words:
基金项目:
中文摘要
目的研究芒柄花素诱导人乳腺癌MCF-7细胞凋亡的作用及氧化应激机制。方法采用MTT法检测不同剂量的芒柄花素(8、16、32、64、128μmol·L-1)作用48 h后人乳腺癌MCF-7细胞的增殖抑制率; Annexin V/PI双染法流式细胞术检测MCF-7细胞的凋亡率; DCFH-DA荧光标记检测MCF-7细胞内活性氧(ROS)的水平; Rhodamine123探针染色分析芒柄花素及其联合NAC对MCF-7细胞线粒体膜电位(MMP)的影响; Western Blot法分析芒柄花素及其联合NAC对Bcl-2、Bax、caspase-3、JNK及P-JNK蛋白表达水平的影响;分光光度法测定MCF-7细胞内氧化应激相关的3种抗氧化酶:超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-PX)的活力。结果芒柄花素能显著抑制MCF-7细胞的增殖,且呈剂量依赖性,48 h的IC50值为79.1μmol·L-1;随着芒柄花素剂量的增加凋亡率、ROS水平升高,膜电位降低,与对照组比较,联合ROS抑制剂NAC可显著拮抗此作用;与对照组比较,芒柄花素能下调MCF-7细胞内Bcl-2蛋白表达水平,上调Bax、cleaved Caspase-3、P-JNK蛋白表达的水平,并呈剂量依赖性。SOD、CAT、GSH-PX活力随着芒柄花素剂量的增加而降低。结论芒柄花素可能通过降低MCF-7细胞抗氧化酶活力、升高ROS水平,发生氧化应激,激活JNK信号通路,增加Bax/Bcl-2表达的比例,致使线粒体损伤,线粒体膜电位下降,最终激活Caspase-3,引起细胞凋亡的发生。
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