摘要
目的:构建人粘蛋白(MUC4)启动子驱动下的单纯疱疹胸苷激酶基因(HSV-TK)重组腺病毒,研究其对SGC-7901胃癌细胞的靶向杀伤作用。方法:克隆MUC4启动子区625bp活性序列,构建重组荧光素酶报告基因载体pGL3-MUC4,检测其在SGC-7901胃癌细胞及NIH3T3成纤维细胞中的转录活性。以AdEasyTM腺病毒系统为载体,构建MUC4启动子驱动下的HSV-TK重组腺病毒rAdeno-MUC4-TK,感染SGC-7901及NIH3T3,经更昔洛韦(GCV)处理,MTT法检测细胞活力,TUNEL法检测细胞凋亡。结果:成功扩增出大小为625bp的MUC4启动子序列。pGL3-MUC4在SGC-7901细胞中具有强转录活性,转录活性高于强启动子SV40 6.6倍,而NIH3T3成纤维细胞系中几乎无转录活性。构建重组腺病毒rAdeno-MUC4-TK,MTT法和TUNEL检测结果显示,其与GCV联合能够诱导SGC-7901细胞凋亡,产生靶向细胞毒作用。结论:人MUC4启动子驱动下的HSV-TK重组腺病毒联合GCV对SGC-7901胃癌细胞具有靶向杀伤作用,MUC4启动子可以作为胃癌靶向基因治疗的工具。
OBJECTIVE: To construct the recombinant adenovirus carrying herpes simplex virus thymidine kinase (HSV-TK) driven by human mucin 4 (MUC4) promoter and analyze its selective cytotoxic effect in vitro on human gas tric cancer cell line SGC 7901 combined with ganciclovir (GCV). METHODS: The fragment of MUC4 promoter from hu man genome DNA and construct pGL3-MUC4 recombinant luciferase report vector were coloned and its transcriptional ac- tivities in SGC-7901 and NIH3T3 cell lines was analyzed. The recombinant adenovirus carrying HSV-TK driven by hu man MUC4 promoter (rAdeno-MUC4-TK) based on AdEasyTM adenoviral system was constructed and the selective cy- totoxie effect of the recombinant adenovirus on SGC-7901 cells combined with prodrug GCV was analyzed by MTT and TUNEL assays. RESULTS: Totally 625 bp MUC4 promoter fragment was coloned by PCR. pGI.3--MUC4 showed high tran- scriptional activitiy in SGC 7901 cell 6.6 time stronger than SV40 strong promoter but little in NIH3T3 fibroblast cell. rAdeno- MUC4-TK combined with C^V could evidently inhibit the proliferation of SGC-7901 cells and induce cell apoptosis, but showed low activity in NIH3T3 fibroblast cell. CONCLUSION: Adenoviral-mediated suicide gene therapy controlled by MUC4 promoter can induce specific cytotoxic effect on SCA2-7901 gastric cancer cells,suggesting MUC4 promoter can be serve as a useful tool for transcriptional targeting of gastric cancer gene therapy.
出处
《中华肿瘤防治杂志》
CAS
北大核心
2012年第1期10-14,共5页
Chinese Journal of Cancer Prevention and Treatment
基金
国家自然科学基金(81001180)
陕西省自然科学基金(2010JM4005)
关键词
粘蛋白
启动区/遗传学
转录
遗传
基因疗法
腺病毒
人
mucin
promoter regions/genetics
transcription, genetic
gene therapy
adenoviruses, human