人参皂苷Rg3靶向Wnt/β-连环蛋白信号通路调控胃癌顺铂耐药性

目的 探讨人参皂苷Rg3联合顺铂(DDP)对DDP耐药细胞SGC-7901/DDP的抑制作用及其分子机制。方法 将SGC-7901/DDP细胞分为4组:对照组、人参皂苷Rg3(40 μg/ml)治疗组、DDP(1.40 μg/ml)治疗组及联合治疗组。采用MTT、EdU和平板克隆形成实验检测SGC-7901/DDP细胞增殖能力,流式细胞术和Hoechst 33342染色法检测SGC-7901/DDP细胞凋亡能力,Western blot检测凋亡相关标志物的表达,细胞划痕和Transwell实验检测SGC-7901/DDP细胞迁移能力,Western blot和免疫荧光染色检测上皮-间充质转化(EMT)和Wnt/β-连环蛋白(β-catenin)信号通路相关标志物的表达水平。结果 与人参皂苷Rg3治疗组和DDP治疗组比较,联合治疗组显著抑制SGC-7901/DDP细胞的增殖(t=8.062,P=0.001;t=7.090,P=0.002)、克隆形成(t=8.062,P=0.001;t=6.144,P=0.004)和迁移能力(t=7.424,P=0.002;t=4.317,P=0.013),同时促进细胞的凋亡能力(t=5.530,P=0.031;t=6.036,P=0.026)。与人参皂苷Rg3治疗组和DDP治疗组比较,联合治疗组显著抑制EMT相关蛋白波形蛋白(t=24.450,P<0.001;t=14.750,P<0.001)、Snail(t=29.640,P<0.001;t=70.700,P<0.001)、Slug(t=89.230,P<0.001;t=87.360,P<0.001)、基质金属蛋白酶(MMP)2(t=84.540,P<0.001;t=67.120,P<0.001)、MMP9(t=19.010,P<0.001;t=10.890,P<0.001)及Wnt/β-catenin信号通路相关蛋白Wnt(t=35.480,P<0.001;t=14.670,P<0.001)、β-catenin(t=155.800,P<0.001;t=118.100,P<0.001)、C-myc(t=20.870,P<0.001;t=3.334,P=0.029)、细胞周期蛋白D1(t=5.007,P=0.008;t=8.347,P=0.001)的表达,同时显著上调上皮细胞相关蛋白E钙黏蛋白(t=36.450,P<0.001;t=33.810,P<0.001)和ZO-1(t=37.060,P<0.001;t=37.030,P<0.001)的表达。结论 人参皂苷Rg3通过抑制Wnt/β-catenin信号通路活性,增强SGC-7901/DDP细胞对DDP的敏感性。

Ginsenoside Rg3 Regulates Cisplatin Resistance in Gastric Cancer by Wnt/β-catenin Signaling Pathway

Objective To investigate the inhibitory effect of ginsenoside Rg3 combined with cisplatin (DDP) on DDP-resistant cell line SGC-7901/DDP and their molecular mechanism.Methods SGC-7901/DDP cells were divided into four groups including a control group,a ginsenoside Rg3 (40 μg/ml) treatment group,a DDP (1.40 μg/ml) treatment group,and a drug combination treatment group.The proliferation ability of SGC-7901/DDP cells was detected by MTT,EdU,and colony formation assays.The apoptosis ability of SGC-7901/DDP cell was detected by flow cytometry and Hoechst 33342 staining.The protein levels of apoptosis-related markers were detected by Western blotting.The migration ability of SGC-7901/DDP cells was detected by wound healing and Transwell assays.The expression levels of proteins in epithelial-mesenchymal transformation (EMT) and Wnt/β-catenin signaling pathway were determined by Western blotting and immunofluorescence staining.Results Compared with the ginsenoside Rg3 or the DDP treatment groups,the drug combination treatment group inhibited the proliferation (t=8.062,P=0.001;t=7.090,P=0.002),colony formation (t=8.062,P=0.001;t=6.144,P=0.004),and migration (t=7.424,P=0.002;t=4.317,P=0.013),and promoted the apoptosis (t=5.530,P=0.031;t=6.036,P=0.026) of SGC-7901/DDP cells.Compared with the ginsenoside Rg3 and the DDP treatment groups,the drug combination treatment group down-regulated the expression levels of EMT-associated proteins including vimentin (t=24.450,P<0.001;t=14.750,P<0.001),Snail (t=29.640,P<0.001;t=70.700,P<0.001),Slug (t=89.230,P<0.001;t=87.360,P<0.001),matrix metalloproteinase (MMP) 2 (t=84.540,P<0.001;t=67.120,P<0.001),and MMP9 (t=19.010,P<0.001;t=10.890,P<0.001),as well as those of Wnt/β-catenin signaling pathway related proteins including Wnt (t=35.480,P<0.001;t=14.670,P<0.001),β-catenin (t=155.800,P<0.001;t=118.100,P<0.001),C-myc (t=20.870,P<0.001;t=3.334,P=0.029),and cyclin D1 (t=5.007,P=0.008;t=8.347,P=0.001).Meanwhile,it up-regulated the expression of epithelial cells including E-cadherin (t=36.450,P<0.001;t=33.810,P<0.001) and ZO-1 (t=37.060,P<0.001;t=37.030,P<0.001).Conclusion Ginsenoside Rg3 enhanced the sensitivity of SGC-7901/DDP cells to DDP by inhibiting the activity of Wnt/β-catenin signaling pathway.