目的:研究抑制FA/BRCA途径中的范可尼贫血相关蛋白F(FANCF)基因在增加人肺腺癌CALU-1细胞株对顺铂敏感性中的作用。方法:设计靶向于FANCF基因的3条siRNAs(FANCF-siRNAs),用脂质体转染试剂将其分别转染于CALU-1肺癌细胞株,RT-PCR检测转染...目的:研究抑制FA/BRCA途径中的范可尼贫血相关蛋白F(FANCF)基因在增加人肺腺癌CALU-1细胞株对顺铂敏感性中的作用。方法:设计靶向于FANCF基因的3条siRNAs(FANCF-siRNAs),用脂质体转染试剂将其分别转染于CALU-1肺癌细胞株,RT-PCR检测转染后24 h FANCF mRNA的变化;筛选转染效率最高的siRNA片段。蛋白质印迹法检测经顺铂处理的CALU-1细胞株转染siRNA前后FANCF蛋白表达及FANCD2蛋白单泛素化水平;免疫荧光法测定胞核中FANCD2蛋白核聚小体的形成;CCK-8法测定转染siRNA前后的细胞增殖率变化。结果:与转染前比较,CALU-1肺癌细胞株转染FANCF-siRNA后FANCF蛋白表达明显下降,FANCD2蛋白单泛素化水平和核聚小体形成降低,细胞增殖率显著下降。结论:应用siRNA转染技术沉默FANCF基因可明显增加肺癌细胞对顺铂的敏感性,提示在肺癌靶向治疗策略中,FA/BRCA途径中的FANCF基因很可能是一个潜在的分子靶标。展开更多
Objective： To investigate the effects of xanthotoxin from Apiaceae medicinal plants on cell proliferation and apoptosis, and explore its mechanism of action against human gastric carcinoma SGC-7901 cells in vitro.Met...Objective： To investigate the effects of xanthotoxin from Apiaceae medicinal plants on cell proliferation and apoptosis, and explore its mechanism of action against human gastric carcinoma SGC-7901 cells in vitro.Methods： SGC-7901, HepG-2, MCF-7, and A549 cells were treated with different concentrations of xanthotoxin（10, 20, 60, 80, 100, 120, 140, and 160 μg/mL） for 48 h, and the cell viability（IC50） was determined by MTT assay; Xanthotoxin-induced apoptosis in cells was observed by using Hoechst 33258 Staining Kit and Annexin V-FITC Apoptosis Detection Kit; Flow cytometry was used to detect apoptosis related proteins of Fas/FasL, Bid, and DR5/TRAIL proteins in human gastric carcinoma SGC-7901 cells after being treated by xanthotoxin; The influence of xanthotoxin on Caspase-8 protein expression in the cells was determined by Flouormetric Assay Kit.Results： Xanthotoxin obviously inhibited SGC-7901, HepG-2, MCF-7, and A549 cells proliferation, and its inhibition was in a concentration-dependent manner; flow cytometry results showed that in a certain concentration range, xanthotoxin can increase the expression levels of Fas/FasL and DR5/TRAIL proteins in a concentration-dependence manner. The content of Bid protein in cells was increased, and it showed concentration-dependence.Conclusion： Xanthotoxin may induce SGC-7901 cells apoptosis in a certain concentration range through the Fas/FasL protein mediated death receptor pathway, or by DR5/TRAIL mediated death receptor pathway, and increase the expression level of death receptor protein, activation Caspase-8, activating downstream effect factor, inducing cell apoptosis, or activate Caspase-8 cutting activate protein Bid, and then enter the mitochondrial pathway, induction of apoptosis.展开更多
文摘目的:研究抑制FA/BRCA途径中的范可尼贫血相关蛋白F(FANCF)基因在增加人肺腺癌CALU-1细胞株对顺铂敏感性中的作用。方法:设计靶向于FANCF基因的3条siRNAs(FANCF-siRNAs),用脂质体转染试剂将其分别转染于CALU-1肺癌细胞株,RT-PCR检测转染后24 h FANCF mRNA的变化;筛选转染效率最高的siRNA片段。蛋白质印迹法检测经顺铂处理的CALU-1细胞株转染siRNA前后FANCF蛋白表达及FANCD2蛋白单泛素化水平;免疫荧光法测定胞核中FANCD2蛋白核聚小体的形成;CCK-8法测定转染siRNA前后的细胞增殖率变化。结果:与转染前比较,CALU-1肺癌细胞株转染FANCF-siRNA后FANCF蛋白表达明显下降,FANCD2蛋白单泛素化水平和核聚小体形成降低,细胞增殖率显著下降。结论:应用siRNA转染技术沉默FANCF基因可明显增加肺癌细胞对顺铂的敏感性,提示在肺癌靶向治疗策略中,FA/BRCA途径中的FANCF基因很可能是一个潜在的分子靶标。
基金supported by Harbin University of Commerce Research Funding(17x072)
文摘Objective： To investigate the effects of xanthotoxin from Apiaceae medicinal plants on cell proliferation and apoptosis, and explore its mechanism of action against human gastric carcinoma SGC-7901 cells in vitro.Methods： SGC-7901, HepG-2, MCF-7, and A549 cells were treated with different concentrations of xanthotoxin（10, 20, 60, 80, 100, 120, 140, and 160 μg/mL） for 48 h, and the cell viability（IC50） was determined by MTT assay; Xanthotoxin-induced apoptosis in cells was observed by using Hoechst 33258 Staining Kit and Annexin V-FITC Apoptosis Detection Kit; Flow cytometry was used to detect apoptosis related proteins of Fas/FasL, Bid, and DR5/TRAIL proteins in human gastric carcinoma SGC-7901 cells after being treated by xanthotoxin; The influence of xanthotoxin on Caspase-8 protein expression in the cells was determined by Flouormetric Assay Kit.Results： Xanthotoxin obviously inhibited SGC-7901, HepG-2, MCF-7, and A549 cells proliferation, and its inhibition was in a concentration-dependent manner; flow cytometry results showed that in a certain concentration range, xanthotoxin can increase the expression levels of Fas/FasL and DR5/TRAIL proteins in a concentration-dependence manner. The content of Bid protein in cells was increased, and it showed concentration-dependence.Conclusion： Xanthotoxin may induce SGC-7901 cells apoptosis in a certain concentration range through the Fas/FasL protein mediated death receptor pathway, or by DR5/TRAIL mediated death receptor pathway, and increase the expression level of death receptor protein, activation Caspase-8, activating downstream effect factor, inducing cell apoptosis, or activate Caspase-8 cutting activate protein Bid, and then enter the mitochondrial pathway, induction of apoptosis.
