桑黄酮G通过调控PI3K/AKT/mTOR通路抑制胃癌细胞的生长、迁移和侵袭

Kuwanon G inhibits growth,migration and invasion of gastric cancer cells by regulating the PI3K/AKT/mTOR pathway

目的探讨桑黄酮G(KG)对胃癌细胞的增殖、凋亡、迁移和侵袭的作用和分子机制。方法通过CCK-8实验、细胞克隆形成实验、裸鼠背部成瘤和Ki-67免疫组织化学染色评估不同浓度KG对胃癌细胞增殖与生长的影响;应用Annexin V-FITC/PI细胞凋亡检测试剂盒、Western blotting分析凋亡相关蛋白表达和Tunel染色评估KG对胃癌细胞凋亡的影响;使用Transwell迁移和侵袭实验与Western blotting分析基质金属蛋白酶表达检测KG对胃癌细胞迁移和侵袭的作用;利用免疫印迹技术和rescue实验验证PI3K/AKT/mTOR通路在KG调控胃癌细胞的增殖、迁移和侵袭的作用。结果KG以浓度依赖性抑制胃癌细胞的增殖和减少细胞形成克隆数(P<0.05);KG上调凋亡细胞比例,促进cleaved caspase-3、Bcl2-Bax表达并下调Bcl2水平(P<0.05);KG干扰胃癌细胞的迁移和侵袭,并且抑制基质金属蛋白酶2(MMP2)和基质金属蛋白酶9(MMP9)的表达(P<0.05)。机制验证显示,KG抑制PI3K/AKT/mTOR通路的激活,且PI3K/AKT/mTOR通路的激活剂IGF-1逆转了KG对胃癌细胞增殖、迁移和侵袭的影响(P<0.05)。结论KG至少部分是通过抑制PI3K/AKT/mTOR通路的激活影响胃癌细胞的增殖、凋亡、迁移和侵袭。

Objective To investigate the effects of kuwanon G(KG)on proliferation,apoptosis,migration and invasion of gastric cancer cells and the molecular mechanisms.Methods The effects of KG on proliferation and growth of gastric cancer cells were assessed with CCK-8 assay and cell clone formation assay,by observing tumor formation on the back of nude mice and using immunohistochemical analysis of Ki-67.The effect of KG on cell apoptosis was analyzed using Annexin V-FITC/PI apoptosis detection kit,Western blotting and TUNEL staining.The effects of KG on cell migration and invasion were detected using Transwell migration and invasion assay and Western blotting for matrix metalloproteinase(MMP).The role of phosphatidylinositol 3-kinase(PI3K)/protein kinase B(AKT)/mammalian target of rapamycin(mTOR)pathway in KGmediated regulation of gastric cancer cell proliferation,migration,and invasion was verified by Western blotting and rescue assay.Results KG significantly inhibited proliferation and reduced clone formation ability of gastric cancer cells in a concentration-dependent manner(P<0.05).KG treatment also increased apoptosis,enhanced the expressions of cleaved caspase-3 and Bax,down-regulated Bcl-2,lowered migration and invasion capacities and inhibited the expression of MMP2 and MMP9 in gastric cancer cells(P<0.05).Mechanistic validation showed that KG inhibited the activation of the PI3K/AKT/mTOR pathway,and IGF-1,an activator of the PI3K/AKT/mTOR pathway,reversed the effects of KG on proliferation,migration and invasion of gastric cancer cells(P<0.05).Conclusion KG inhibits proliferation,migration and invasion and promotes apoptosis of gastric cancer cells at least in part by inhibiting the activation of the PI3K/AKT/mTOR pathway.