O6 -methylguanine- DNA- methyltransferase (MGMT ) plays a very important role in the cellular resis- tance to nitrosoureas drugs. Inhibition of MGMT might be a useful approach in tumor chemotherapy. In this study, the...O6 -methylguanine- DNA- methyltransferase (MGMT ) plays a very important role in the cellular resis- tance to nitrosoureas drugs. Inhibition of MGMT might be a useful approach in tumor chemotherapy. In this study, the depletion of MGMT activity by retroviral-mediated antisense RNA transfection were reported. Three retroviral vectors expressing MGMT antisense RNA were constructed and transfected into HeLa S3 cells. The difference of MGMT mRNA, MGMT activity as well as cellular resistance to ACNU before and after transfection were observed. It was found that antisense RNA targeting 5’region and whole length of MGMT mRNA could partially deplete MGMT activity and enhance killing effects of ACNU. However, 3’ region antisense RNA had no effect on MGMT modulation.展开更多
目的观察人胰腺癌Mia Pa Ca-2细胞总RNA电转染树突细胞(Dendritic Cell,DC)体外激发抗原特异性细胞毒T淋巴细胞(Cytotoxic T Lymphocyte,CTL)的能力。方法自6例胰腺癌患者外周血单核细胞中分离、培养DC。使用电穿孔法将Mia Pa Ca-2细胞...目的观察人胰腺癌Mia Pa Ca-2细胞总RNA电转染树突细胞(Dendritic Cell,DC)体外激发抗原特异性细胞毒T淋巴细胞(Cytotoxic T Lymphocyte,CTL)的能力。方法自6例胰腺癌患者外周血单核细胞中分离、培养DC。使用电穿孔法将Mia Pa Ca-2细胞总RNA体外转录和PCR扩增的MUC1m RNA转染DC,以未负载抗原的DC为对照。采用实时定量PCR技术检测各组DC中MUC1表达。四甲基偶氮唑盐(MTT)检测转染各组DC存活率变化;混合细胞培养法评价各组DC体外刺激自体T淋巴细胞增殖能力;ELISA法检测各组DC体外激发抗原特异性CTL细胞因子释放量。结果 Mia Pa Ca-2总RNA与MUC1 m RNA分别转染后48 h DC中目标抗原的相对表达量分别为37.24±3.17和34.53±2.02,两者比较无显著差异(P>0.05)。电转染后96 h Mia Pa Ca-2总RNA转染组DC存活率降至60.81%,低于MUC1 m RNA单转染时DC的存活率(80%左右)(P<0.05)。转染Mia Pa Ca-2总RNA DC刺激自体T细胞增殖指数为8 432±611.25,显著高于MUC1单独转染组3 664±305.17(P<0.05);且转染Mia Pa Ca-2总RNA DC激发特异性CTL分泌IL-2、IL-10、Granzyme B、IFN-γ水平亦显著高于MUC1 m RNA单独转染组(P<0.05)。结论胰腺癌肿瘤细胞总RNA转染的DC较单一胰腺癌相关抗原负载DC有更强的体外抗原特异性CTL激发能力。展开更多
目的比较人胰腺癌MiaPaCa-2细胞总RNA电转染树突细胞(Dendritic Cell,DC)与DCMiaPaCa-2融合细胞体外激发抗原特异性细胞毒T淋巴细胞(Cytotoxic T Lymphocyte,CTL)能力的差异。方法自6例胰腺癌患者外周血单核细胞中分离、培养DC。使用电...目的比较人胰腺癌MiaPaCa-2细胞总RNA电转染树突细胞(Dendritic Cell,DC)与DCMiaPaCa-2融合细胞体外激发抗原特异性细胞毒T淋巴细胞(Cytotoxic T Lymphocyte,CTL)能力的差异。方法自6例胰腺癌患者外周血单核细胞中分离、培养DC。使用电穿孔法将MiaPaCa-2细胞总RNA转染DC,使用细胞融合方法将胰腺癌MiaPaCa-2细胞抗原负载DC,以未负载抗原的DC为对照。使用流式细胞术(FCM)检测PE-MUC/FITC-CD86抗体双标细胞评估融合效率;四甲基偶氮唑盐(MTT)检测转染各组DC存活率;混合细胞培养法评价各组DC体外刺激自体T淋巴细胞增殖能力;ELISA法检测各组DC体外激发抗原特异性CTL因子释放量。结果采用PEG-DMSO诱导的DC与MiaPaCa-2的融合细胞同时表达DC表型和MUC1分子,CD86与MUC1双阳性表达率为(42.3±7.30)%;融合细胞组DC存活率呈时间依赖性下降,转染后96h的存活率降低至62.81%,而MiaPaCa-2总RNA转染组DC细胞存活率稳定在85%左右,两组间差异有统计学意义(P<0.05);转染MiaPaCa-2总RNA DC刺激自体T细胞增殖指数(DC:T=1:10)为8432±611.25,显著高于DC-MiaPaCa-2融合细胞(DC:T=1:10)5672±107.51(P<0.05);且MiaPaCa-2总RNA转染DC激发特异性CTL分泌IL-12p70、IL-10和IFN-γ细胞水平亦显著异于DC-MiaPaCa-2融合细胞(P<0.05)。结论胰腺癌细胞总RNA转染DC较胰腺癌-树突融合细胞有更强的体外抗原特异性CTL激发能力。展开更多
基金This project is supported by National Foundation of Natural sciences of China.
文摘O6 -methylguanine- DNA- methyltransferase (MGMT ) plays a very important role in the cellular resis- tance to nitrosoureas drugs. Inhibition of MGMT might be a useful approach in tumor chemotherapy. In this study, the depletion of MGMT activity by retroviral-mediated antisense RNA transfection were reported. Three retroviral vectors expressing MGMT antisense RNA were constructed and transfected into HeLa S3 cells. The difference of MGMT mRNA, MGMT activity as well as cellular resistance to ACNU before and after transfection were observed. It was found that antisense RNA targeting 5’region and whole length of MGMT mRNA could partially deplete MGMT activity and enhance killing effects of ACNU. However, 3’ region antisense RNA had no effect on MGMT modulation.
文摘目的观察人胰腺癌Mia Pa Ca-2细胞总RNA电转染树突细胞(Dendritic Cell,DC)体外激发抗原特异性细胞毒T淋巴细胞(Cytotoxic T Lymphocyte,CTL)的能力。方法自6例胰腺癌患者外周血单核细胞中分离、培养DC。使用电穿孔法将Mia Pa Ca-2细胞总RNA体外转录和PCR扩增的MUC1m RNA转染DC,以未负载抗原的DC为对照。采用实时定量PCR技术检测各组DC中MUC1表达。四甲基偶氮唑盐(MTT)检测转染各组DC存活率变化;混合细胞培养法评价各组DC体外刺激自体T淋巴细胞增殖能力;ELISA法检测各组DC体外激发抗原特异性CTL细胞因子释放量。结果 Mia Pa Ca-2总RNA与MUC1 m RNA分别转染后48 h DC中目标抗原的相对表达量分别为37.24±3.17和34.53±2.02,两者比较无显著差异(P>0.05)。电转染后96 h Mia Pa Ca-2总RNA转染组DC存活率降至60.81%,低于MUC1 m RNA单转染时DC的存活率(80%左右)(P<0.05)。转染Mia Pa Ca-2总RNA DC刺激自体T细胞增殖指数为8 432±611.25,显著高于MUC1单独转染组3 664±305.17(P<0.05);且转染Mia Pa Ca-2总RNA DC激发特异性CTL分泌IL-2、IL-10、Granzyme B、IFN-γ水平亦显著高于MUC1 m RNA单独转染组(P<0.05)。结论胰腺癌肿瘤细胞总RNA转染的DC较单一胰腺癌相关抗原负载DC有更强的体外抗原特异性CTL激发能力。
文摘目的比较人胰腺癌MiaPaCa-2细胞总RNA电转染树突细胞(Dendritic Cell,DC)与DCMiaPaCa-2融合细胞体外激发抗原特异性细胞毒T淋巴细胞(Cytotoxic T Lymphocyte,CTL)能力的差异。方法自6例胰腺癌患者外周血单核细胞中分离、培养DC。使用电穿孔法将MiaPaCa-2细胞总RNA转染DC,使用细胞融合方法将胰腺癌MiaPaCa-2细胞抗原负载DC,以未负载抗原的DC为对照。使用流式细胞术(FCM)检测PE-MUC/FITC-CD86抗体双标细胞评估融合效率;四甲基偶氮唑盐(MTT)检测转染各组DC存活率;混合细胞培养法评价各组DC体外刺激自体T淋巴细胞增殖能力;ELISA法检测各组DC体外激发抗原特异性CTL因子释放量。结果采用PEG-DMSO诱导的DC与MiaPaCa-2的融合细胞同时表达DC表型和MUC1分子,CD86与MUC1双阳性表达率为(42.3±7.30)%;融合细胞组DC存活率呈时间依赖性下降,转染后96h的存活率降低至62.81%,而MiaPaCa-2总RNA转染组DC细胞存活率稳定在85%左右,两组间差异有统计学意义(P<0.05);转染MiaPaCa-2总RNA DC刺激自体T细胞增殖指数(DC:T=1:10)为8432±611.25,显著高于DC-MiaPaCa-2融合细胞(DC:T=1:10)5672±107.51(P<0.05);且MiaPaCa-2总RNA转染DC激发特异性CTL分泌IL-12p70、IL-10和IFN-γ细胞水平亦显著异于DC-MiaPaCa-2融合细胞(P<0.05)。结论胰腺癌细胞总RNA转染DC较胰腺癌-树突融合细胞有更强的体外抗原特异性CTL激发能力。
