Pterostilbene induces retinoblastoma WERI-Rb-1 cell apoptosis via autophagy induction

背景与目的:紫檀芪是一种天然抗氧化剂,其抗视网膜母细胞瘤的效果仍不明确.拟探讨紫檀芪对人视网膜母细胞瘤WERI-Rb-1细胞的细胞增殖、细胞凋亡及细胞自噬的作用,并初步阐明其作用机制.方法:采用细胞计数试剂盒(cell counting kit-8,CCK-8)法测定细胞的增殖活力,Annexin V/PI流式细胞术检测细胞凋亡,吖啶橙染色观察细胞内自噬囊泡的变化,蛋白[质]印迹法(Western blot)检测LC3B及P62蛋白的表达.结果:紫檀芪显著抑制WERI-Rb-1细胞的增殖活力(P<0.01),以25、50和100 μmol/L的药物浓度作用细胞24 h时,细胞增殖活力分别为(93.02±0.47)%、(55.10±2.04)%和(30.33±1.45)%;50μmol/L紫檀芪处理细胞12、24和48 h时,细胞增殖活力分别为(88.38±3.70)%、(53.37±1.17)%和(29.60±1.05)%.紫檀芪显著诱导细胞凋亡(P<0.01),对照组、24和48 h细胞的凋亡率分别为(4.08±0.79)%、(13.44±2.12)%和(23.49±2.01)%.紫檀芪能够激活WERI-Rb-1细胞发生细胞自噬,上调LC3蛋白的表达,下调P62蛋白的表达,增加细胞内自噬囊泡的数量(P<0.01).3-MA及Beclin1 siRNA抑制细胞自噬后能够部分逆转紫檀芪的抗肿瘤作用(P<0.01).3-MA抑制细胞自噬后,紫檀芪处理组的细胞凋亡率为(12.97±2.09)%,3-MA+紫檀芪组为(8.35±1.11)%.siRNA敲低Beclin1后,紫檀芪处理组和siRNA+紫檀芪组的细胞凋亡率分别为(13.80±2.19)%和(9.62±0.52)%.结论:紫檀芪可以显著抑制WERI-Rb-1细胞的细胞增殖并激活细胞自噬促进细胞凋亡.Background and purpose:Pterostilbene is a natural antioxidant, whose role in retinoblastoma remains unclear. The aim of this study is to probe the effects of pterostilbene on the proliferation, apoptosis and autophagy in retinoblastoma WERI-Rb-1 cell lines.Methods:Cell counting kit-8 (CCK-8) assays were used to analyze the effects of pterostilbene on the proliferation of WERI-Rb-1 cells. Apoptosis rate was determined by Annexin V/PI. Autophagic vacuoles were observed by acridine orange staining. LC3 and P62 protein expressions were determined using Western blot.Results:Pterostilbene significantly inhibited the proliferation of WERI-Rb-1 cells (P<0.01). The cell viability were (93.02±0.47)%, (55.10±2.04)% and (30.33±1.45)% after WERI-Rb-1 cells were treated with 25, 50 and 100 μmol/L pterostilbene for 24 h, and the cell viability were (88.38±3.70)%, (53.37±1.17)%, (29.60±1.05)% after WERI-Rb-1 cells were treated with 50 μmol/L pterostilbene for 12, 24 and 48 h. Pterostilbene induced cell apoptosis (P<0.01), the apoptosis rates of control group, 24 h treated group and 48 h treated group were (4.08±0.79)%, (13.44±2.12)% and (23.49±2.01)%. Pterostilbene induced autophagy of WERI-Rb-1 cells, increased LC3 expression, downregulated P62 expression and increased the number of autophagic vacuoles in WERI-Rb-1 cells (P<0.01). 3-MA and Beclin1 were able to rescue pterostilbene-induced cell death (P<0.01). After 3-MA was used to blunt autophagosome formation, the apoptosis rate markedly decreased in 3-MA+pterostilbene-treated cells compared with cells treated with pterostilbene alone [(12.97±2.09)%vs (8.35±1.11)%], and after siRNA was used to knockdown Beclin1, the apoptosis rate had the same change [(13.80±2.19)%vs (9.62±0.52)%].Conclusion:Pterostilbene can inhibit the proliferation of WERI-Rb-1 cells and induce cell apoptosis via autophagy activation.河北省医学科学研究重点课题中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)11900-9052