淫羊藿苷通过调节PI3K/AKT/mTOR通路对小鼠黑色素瘤B16细胞生物学行为及作用机制研究

Study on biological behavior and mechanism of icariin on mouse melanoma B16 cells by regulating PI3K/AKT/mTOR pathway

目的:研究淫羊藿苷对小鼠黑色素瘤B16细胞增殖、凋亡、迁移等生物学行为的影响及作用机制。方法:小鼠黑色素瘤B16细胞经过不同浓度淫羊藿苷(0、10、20、50μmol/L)处理后,培养24 h,检测细胞增殖、形态、凋亡、迁移能力情况,并采用Western blot法检测细胞磷脂酰肌醇-3-羟激酶/蛋白激酶B/哺乳动物雷帕霉素靶蛋白(PI3K/Ak/mTOR)通路相关蛋白的表达情况。结果:小鼠黑色素瘤B16细胞经过淫羊藿苷处理后,随着给药浓度的增加,抑制率、凋亡率均显著增加(P<0.05)。经Hoechst 33258染色发现空白对照组(0μmol/L)细胞染色均匀且颜色较淡,而含有淫羊藿苷细胞细胞则颜色较浓,且淫羊藿苷浓度越高,染色质凝集程度越明显。B16细胞划痕愈合率、Transwell膜底面的细胞计数随着淫羊藿苷浓度增加均显著降低(P<0.05)。蛋白检测结果显示随着给药浓度的增加,基质金属蛋白酶-9(matrix metalloproteinases-9,MMP-9)、基质金属蛋白酶-2(matrix metalloproteinases-9,MMP-2)、mTOR表达量显著降低,而PI3K/pPI3K、AKT/pAKT比值显著增加,组间比较差异显著(P<0.05)。结论:淫羊藿苷可有效抑制小鼠黑色素瘤B16细胞PI3K/AKT/mTOR通路相关蛋白表达,从而诱导肿瘤细胞凋亡,抑制细胞迁移功能,最终发挥抗肿瘤效果。

Objective:To study the effect and mechanism of icariin on the migration,proliferation and apoptosis of mouse melanoma B16 cells.Methods:Mouse melanoma B16 cells were treated with icariin at different concentrations(0,10,20,50μmol/L)for 24 hours.Cell proliferation,morphology,apoptosis and migration ability were detected,and the expression of PI3K/AKT/mTOR pathway related proteins was detected by Western blot assay.Results:After treatment with icariin,the inhibition rate and apoptosis rate of mouse melanoma B16 cells increased significantly with the increase of administration concentration(P<0.05).Hoechst 33258 staining showed that the cells in the blank control group(0μmol/L)were uniformly stained and the color was lighter,while the cells in the experimental group containing icariin were thicker in color.The higher the concentration of the icariin is,the more obvious the degree of chromatin aggregation.The scratch healing rate of B16 cells and the cell count on the bottom of Transwell membrane decreased significantly with the increase of icariin concentration(P<0.05).The results of protein detection showed that with the increase of administration concentration,the expression of MMP-9,MMP-2 and mTOR decreased significantly,while the ratio of PI3K/pPI3K and AKT/pAKT increased significantly,and there was significant difference between the groups(P<0.05).Conclusion:Icariin can effectively inhibit the expression of PI3K/AKT/mTOR pathway related proteins in mouse melanoma B16 cells,thus inducing apoptosis of tumor cells,inhibiting cell migration and finally exerting antitumor effect.