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| 1 | Lethiferous effects of a recombinant vector carrying thymidine kinase suicide gene on 2.2.15 cells via a self-modulating mechanism显示文摘AIM: To determine the lethiferous effects of a recombinant vector carrying thymidine kinase (TK) suicide gene on 2.2.15cells and the possible self-modulating mechanism.METHODS: A self-modulated expressive plasmid pcDNA3-SCITK was constructed by inserting the fragments carrying hepatitis B virus antisense-S (HBV-anti-S) gene, hepatitis C virus core (HCV-C) gene, internal ribosome entry site (IRES) element of HCV and TK gene into the eukaryotic vector pcDNA3, in which the expression of TK suicide gene was controlled by the HBV S gene transcription. 2.2.15cells that carry the full HBV genome and stably express series of HBV antigen were transfected with pcDNA3-SCITK or vector pcDNA3-SCI which was used as the mock plasmid. The HepG2 cells transfected with pcDNA3-SCITK were functioned as the negative control. All the transfected cells were incubated in DMEM medium supplemented with 10 μg/ml. Of ganciclovir (GCV). The HBsAg levels in the supernatant of cell culture were detected by ELISA on the 1st, 3rd and 6th day post-transfection. Meanwhile, the morphology of tranfected cells was recorded by the photograph and the survival cell ratio was assessed by the trypan blue exclusion test on the 6th day posttransfection.RESULTS: The structural accuracy of pcDNA3-SCITK was confirmed by restriction endonuclease digestion, PCR with specific primers and DNA sequencing. The HBsAg levels in the supernatant of transfected 2.2.15 cell culture were significantly decreased on the 6th day post-transfection as compared with that of the mock control (P<0.05). The lethiferous effect of pcDNA3-SCITK expression on 2.2.15cells was initially noted on the 3rd day after transfection and aggravated on the 6th day post transfection, in which the majority of transfected 2.2.15 cells were observed shrunken, round in shape and even dead. With assessment by the trypan blue exclusion test, the survival cell ratio on the 6th day post transfection was 95% in the negative control and only 11% in the experimental group.CONCLUSION: The results indicate that suicide gene expression of pcDNA3-SCITK can only respond to HBV-S gene transcription, which may be potentially useful in the treatment of HBV infection and its related liver malignancies. | Quan-ChengKan Zu-JiangYu Yan-ChangLei Lian-JieHao Dong-LiangYang | 2003 | World Journal of Gastroenterology2003，9，10： | 5 |
| 2 | 慢性乙型肝炎病毒清除自杀基因平衡制约载体系统的构建显示文摘目的:建立清除乙型肝炎病毒(HBV)自杀基因平衡制约载体系统,靶向清除HBV感染的肝细胞,抑制慢性乙型肝炎和肝硬化患者免疫再括动。方法:逆转录PCR(RT-PCR)扩增丙型肝炎病毒(HCV)基因组中核糖体插入位点(IRES),以pcDNA3载体为基础,构建双顺反子表达载体,同时在IRES位点的上游克隆HBV表面基因的部分反义序列和HCV全长核心基因,在IRES位点下游克隆胸腺苷激酶基因,PCR、酶切和测序鉴定。构建的清除乙型肝炎病毒(HBV)自杀基因平衡制约载体系统分别转染培养基含有更昔洛韦的HepG2细胞和2.2.15细胞。结果:构建的清除乙型肝炎病毒(HBV)自杀基因平衡制约载体系统可以选择性促使2.215细胞凋亡(实验组细胞凋亡率为15%,而对照组仅为6%);抑制2.2.15细胞在培养基中分泌乙型肝炎病毒表面抗原(HBsAg),统计学分析表明,HBsAg在培养基中检测滴度,在两组之间有显著性差异(P<0.05).结论:构建以HBV表面基因为靶基因,自杀基因为效应基因的自杀基因制约平衡系统,可能为下一步慢性乙型肝炎的基因治疗提供理想的基因治疗载体。 | 阚全程 余祖江 雷延昌 杨东亮 郝连杰 | 2003 | 世界华人消化杂志2003，11，10： | 1 |
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