目的:探讨三阴性乳腺癌顺铂(cisplatin,DDP)耐药细胞和敏感细胞中FA/BRCA通路关键基因FANCF的表达和功能,以及与DDP耐药的相关性。方法:DDP浓度递增法诱导建立乳腺癌细胞MDA-MB-231的DDP耐药细胞株MDA-MB-231/DDP;通过RNAi技术敲减MDA-M...目的:探讨三阴性乳腺癌顺铂(cisplatin,DDP)耐药细胞和敏感细胞中FA/BRCA通路关键基因FANCF的表达和功能,以及与DDP耐药的相关性。方法:DDP浓度递增法诱导建立乳腺癌细胞MDA-MB-231的DDP耐药细胞株MDA-MB-231/DDP;通过RNAi技术敲减MDA-MB-231敏感细胞和DDP耐药细胞中FANCF,并在m RNA和蛋白水平进行敲减效果验证。CCK-8法检测DDP耐药细胞株增殖活性,Western blotting法检测该细胞中FANCF蛋白表达,流式细胞仪检测MDA-MB-231细胞周期和凋亡情况,实时定量PCR(RT-q PCR)法检测FANCF m RNA的表达。结果:MDA-MB-231细胞DDP诱导3个月建立的MDA-MB-231/DDP细胞株耐药指数为13.5,其G0/G1期细胞增多、S期和G2/M期细胞减少。MDA-MB-231/DDP细胞中FANCF m RNA和蛋白表达水平显著升高(均P<0.01)。FANCF敲低后MDA-MB-231/DDP细胞凋亡增加,细胞对DDP的药物敏感性显著升高(均P<0.01)。结论:FANCF基因通过抗凋亡作用导致MDA-MB-231细胞对DDP的耐药性,FANCF是乳腺癌治疗的一个潜在靶点。展开更多
Objective: The aim of the study was to explore the effect of demethylating agent 5-Aza-2'-deoxycytidine (5-ADC) on expression of Fanconi anemia complementation group F (FANCF) gene and the proliferation of cervica...Objective: The aim of the study was to explore the effect of demethylating agent 5-Aza-2'-deoxycytidine (5-ADC) on expression of Fanconi anemia complementation group F (FANCF) gene and the proliferation of cervical cancer cells, to observe cell's sensitivity to chemotherapeutic drug taxol, and to explore the antitumor effect of 5-ADC as well as the new treatment of cervical cancer. Methods: Cervical cancer cell lines SiHa (FANCF gene full-methylated) and Hela (unmethylated) were treated with 5-ADC. We used the methylation-specific PCR (MSP), reverse transcription-polymerase chain reaction (RT-PCR) and Western blot to detect the FANCF methylation, mRNA and protein respectively. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was used to detect the proliferation of cells. The cytotoxicity of taxol was measured by flow cytometer. The nude mice bearing SiHa was used to observe the effect of 5-ADC in vivo. Results: Inhibition of DNA promoter methylation by 5-ADC reactivated the expression of FANCF mRNA and protein in SiHa cells, consistent with decreased growth speed and increased taxol resistance. These results were proven in experiments in vivo. Conclusion: The 5-ADC probably become a potential treatment drug through inhibiting the proliferation of cervical cancer cells in taxol-resistant patients.展开更多
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
文摘目的:探讨三阴性乳腺癌顺铂(cisplatin,DDP)耐药细胞和敏感细胞中FA/BRCA通路关键基因FANCF的表达和功能,以及与DDP耐药的相关性。方法:DDP浓度递增法诱导建立乳腺癌细胞MDA-MB-231的DDP耐药细胞株MDA-MB-231/DDP;通过RNAi技术敲减MDA-MB-231敏感细胞和DDP耐药细胞中FANCF,并在m RNA和蛋白水平进行敲减效果验证。CCK-8法检测DDP耐药细胞株增殖活性,Western blotting法检测该细胞中FANCF蛋白表达,流式细胞仪检测MDA-MB-231细胞周期和凋亡情况,实时定量PCR(RT-q PCR)法检测FANCF m RNA的表达。结果:MDA-MB-231细胞DDP诱导3个月建立的MDA-MB-231/DDP细胞株耐药指数为13.5,其G0/G1期细胞增多、S期和G2/M期细胞减少。MDA-MB-231/DDP细胞中FANCF m RNA和蛋白表达水平显著升高(均P<0.01)。FANCF敲低后MDA-MB-231/DDP细胞凋亡增加,细胞对DDP的药物敏感性显著升高(均P<0.01)。结论:FANCF基因通过抗凋亡作用导致MDA-MB-231细胞对DDP的耐药性,FANCF是乳腺癌治疗的一个潜在靶点。
基金Supported by the grant from the National Science Foundation of Chongqing (No. cstc2011jjA10081)
文摘Objective: The aim of the study was to explore the effect of demethylating agent 5-Aza-2'-deoxycytidine (5-ADC) on expression of Fanconi anemia complementation group F (FANCF) gene and the proliferation of cervical cancer cells, to observe cell's sensitivity to chemotherapeutic drug taxol, and to explore the antitumor effect of 5-ADC as well as the new treatment of cervical cancer. Methods: Cervical cancer cell lines SiHa (FANCF gene full-methylated) and Hela (unmethylated) were treated with 5-ADC. We used the methylation-specific PCR (MSP), reverse transcription-polymerase chain reaction (RT-PCR) and Western blot to detect the FANCF methylation, mRNA and protein respectively. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was used to detect the proliferation of cells. The cytotoxicity of taxol was measured by flow cytometer. The nude mice bearing SiHa was used to observe the effect of 5-ADC in vivo. Results: Inhibition of DNA promoter methylation by 5-ADC reactivated the expression of FANCF mRNA and protein in SiHa cells, consistent with decreased growth speed and increased taxol resistance. These results were proven in experiments in vivo. Conclusion: The 5-ADC probably become a potential treatment drug through inhibiting the proliferation of cervical cancer cells in taxol-resistant patients.
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。
