[关键词]
[摘要]
目的 研究人参皂苷CK对人结肠癌SW480细胞增殖及凋亡的影响,并进一步探讨其作用机制。方法 采用CCK-8法检测细胞活力;通过流式细胞术检测细胞周期、细胞凋亡、活性氧(ROS)水平和线粒体膜电位(MMP)变化;Hoechst染色检测细胞凋亡;蛋白免疫印迹法检测细胞色素C(CytC)释放以及凋亡相关蛋白Bcl-2、Bax和cleaved Caspase-3等的表达。结果 人参皂苷CK对SW480细胞的增殖有显著抑制作用。人参皂苷CK诱导SW480细胞周期阻滞于G0/G1期,促进细胞发生早期凋亡。人参皂苷CK可以显著增加细胞内ROS水平,降低MMP水平;人参皂苷CK促进Bax和cleaved Caspase-3的表达,抑制Bcl-2的表达。此外,人参皂苷CK使SW480细胞内CytC大量释放。结论 人参皂苷CK对SW480细胞的增殖具有显著的抑制作用,其作用机制可能是通过促进线粒体超氧化物升高,导致胞内ROS水平显著增加和MMP显著下降,进而导致CytC释放,上调Bax的表达,下调Bcl-2的表达,最终导致细胞发生凋亡。
[Key word]
[Abstract]
Objective To study the effects of ginsenoside CK on proliferation and apoptosis of human colon cancer cell line SW480, and further explore the mechanism. Methods Cell viability was measured by CCK-8 assay. Cell cycle, apoptosis, reactive oxygen species (ROS) levels and changes in mitochondrial membrane potential were measured by flow cytometry. Hoechst staining further detected apoptosis. Western blotting was used to detect the release of cytochrome C and the expression of apoptosis-related proteins such as Bcl-2, Bax and cleaved Caspase-3. Results Ginsenoside CK had a significant inhibitory effect on the proliferation of human colon cancer cell line SW480. Ginsenoside CK induced SW480 cells arrest in G0/G1 phase, promoted early apoptotic cells, significantly increased intracellular ROS levels and reduced the MMP level. Ginsenoside CK promoted the expression of Bax and cleaved-Caspase-3 and inhibited the expression of Bcl-2. In addition, ginsenoside CK released a large amount of cytochrome C in SW480 cells. Conclusion Ginsenoside CK has a significant inhibitory effect on the proliferation of human colon cancer cell line SW480. The mechanism may be through the promotion of mitochondrial superoxide elevation, resulting in a significant increase in intracellular ROS levels and a significant decrease in MMP level, further leading to the release of cytochrome C, the up-regulated expression of Bax, the down-regulated expression of Bcl-2, and ultimately leading to apoptosis of cells.
[中图分类号]
R285.5
[基金项目]
国家自然科学基金资助项目(81803680);国家自然科学基金资助项目(81973712);吉林省科技发展计划项目(20170307031YY);吉林省科技发展计划项目(20180520050JH)