南方医科大学学报

南方医科大学学报 ›› 2018, Vol. 38 ›› Issue (10): 1187-.doi: 10.12122/j.issn.1673-4254.2018.10.06

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白杨素通过调控MAPKs信号通路促进SMMC-7721细胞凋亡

韦小彤，彭文蕊，姜琦，李强，冯遵永，戚之琳，齐世美   

  • 出版日期:2018-10-20 发布日期:2018-10-20

Chrysin promotes SMMC-7721 cell apoptosis by regulating MAPKs signaling pathway

  • Online:2018-10-20 Published:2018-10-20

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摘要： 目的探究白杨素诱导肝癌细胞系SMMC-7721细胞凋亡的效应及分子机制。方法将SMMC-7721细胞分为空白对照 组，DMSO溶剂对照组和白杨素处理组（5，10，20，40，60，80，100，150，200 μg/mL），采用CCK-8法检测细胞的增殖抑制作用；将 SMMC-7721细胞分为空白对照组，DMSO溶剂对照组和白杨素处理组（5，10，20 μg/mL），在倒置显微镜下观察细胞形态学变 化；DAPI染色后，在荧光倒置显微镜下观察细胞核形态变化；Annexin V-FITC/PI双染法检测细胞凋亡率；将SMMC-7721细胞 分别用白杨素，P38特异性抑制剂SB203580（0，5，10 μmol/L）、ERK特异性抑制剂U0126（0，5，10 μmol/L）和JNK特异性抑制剂 SP600125（0，5，10 μmol/L）处理后，Western blotting技术检测凋亡相关蛋白PARP、caspase-3和凋亡相关信号通路和MAPKs的 磷酸化变化情况。结果白杨素显著抑制SMMC-7721细胞增殖，和对照组相比，DMSO组，5，10，20 μg/mL白杨素处理组细胞 抑制率分别为96%，76%，71.75%和64.29%，具有剂量依赖性。超过60 μg/mL细胞抑制率达到饱和。另外，白杨素促进细胞凋 亡，20 μg/mL 白杨素处理组细胞凋亡率为68.7%，比空白对照组增加了59.4%，PARP 和caspase-3 显著切割。白杨素激活 MAPKs信号通路，具有剂量和时间依赖性。分别用SB203580、U0126、SP600125预处理细胞，白杨素诱导的P38、ERK和JNK 的磷酸化和PARP切割被抑制。结论白杨素通过调控MAPKs信号分子的活化，抑制SMMC-7721细胞的增殖并且促进细胞凋 亡的发生。

Abstract: Objective To study the effect of chrysin in inducing apoptosis of human hepatic carcinoma cells and explore the possible mechanism. Methods Human hepatic carcinoma SMMC-7721 cells treated with DMSO or chrysin at different concentrations (5-200 μg/mL) were examined for changes in the cell proliferation using CCK-8 assay. The morphological changes of SMMC-7721 cells were observed in response to treatment with 5, 10, or 20 μg/mL chrysin, and the changes in the cell nuclei were observed using DAPI nuclear staining. Annexin Ⅴ-FITC/PI flow cytometry was used to determine the cell apoptosis rate. The changes in the apoptosis-related proteins (PARP and caspase-3) and MAPKs signal pathway were detected with Western blotting. Results Chrysin treatment obviously suppressed the proliferation of SMMC-7721 cells in a dose-dependent manner below the concentration of 60 μg/mL. Chrysin (20 μg/mL) also caused significantly increased cell apoptosis and significant cleavage of PARP and caspase-3. Chrysin significantly activated MAPKs signaling pathway in a timeand dose-dependent manner, with the peak activation level occurring at 15 min. Pretreatment of the cells with specific inhibitors of the MAPKs pathway obviously inhibited the effect of chrysin in inducing cell apoptosis. Conclusion Chrysin inhibits the proliferation and promotes apoptosis of SMMC-7721 cells by regulating the activation of MAPKs signaling.