hNET基因重组腺病毒载体构建和体外表达

目的以复制缺陷的腺病毒为载体,用细菌内同源重组法构建含有人的去甲肾上腺素转运子(human neurotransmitter transporter,hNET)基因的腺病毒载体。方法利用限制性内切酶KpnⅠ XbaⅠ从pCMV5质粒中切下目的基因hNET,亚克隆至经同样酶切的腺病毒穿梭质粒pAdtrack-CMV,形成重组穿梭质粒pAdtrack-CMV-hNET,PmeⅠ酶切线性化后,与pAdeasy-1在大肠杆菌BJ5183中进行同源重组,获得含目的基因的重组体质粒Ad-hNET,PacⅠ酶切后用脂质体Lipofectamine2000转染HEK293细胞,包装成重组体腺病毒。采用PCR技术和Western Blotting对重组体腺病毒进行鉴定,利用穿梭质粒pAdTrack-CMV中带有绿色荧光蛋白报告基因检测表达,经过扩增和纯化,测定病毒滴度。结果测序结果证明hNET序列的正确,PCR、PacⅠ酶切电泳和Western Blotting证实腺病毒重组质粒Ad-hNET构建成功。扩增纯化后测定重组病毒Ad-hNET的滴度为1.2×1010pfu/mL。结论成功构建了能表达hNET基因的重组腺病毒载体,为肿瘤的靶向治疗提供前期的研究工作。

Construction and Expression of Replication-deficient Recombinant Adenovirus Vector with hNET Gene by Adeasy-1 System

OBJECTIVE: To construct and identify the recombinant replication deficient adenovirus vector which codes for human Norepinephrine Transporter (hNET) gene by using the method of homogenous recombination in bacteria. METHODS: hNET gene was obtained from the recombinant plasmid pCMV5 via Kpn I + Xba I digestion, and subcloned into E1 deleted expression plasmid pAdtrack-CMV shuttle vector, forming transfer vector pAdtrack-CMV-hNET. Then it was linearized with Pme I followed by homologous recombination with bone plasmid pAdEasy-1 in BJ5183 cells to generate recombinant plasmid Ad-hNET. The DNA of identified Ad-hNET was digested with Pac I and transfected to HEK293 cells by liposome-mediated method to package recombinant adenovirus. The PCR technique was applied to detect the target gene and Western Blotting to verify the expression of hNET. The titre of the Ad-hNET was measured with the aid of green fluorescence protein (GFP) expression after multiplication and purification. RESULTS: By sequencing, it was confirmed that the product was the gene of hNET. PCR test, restriction endonuclease digestion and Western Blotting confirmed the successful construction of the recombinants Ad-hNET. The titre of purified recombinant adenovirus Ad-hNET was 1.2 X 10(10) pfu/mL. CONCLUSION: The recombinant adenovirus with the hNET gene was constructed successfully. It will be helpful for the further investigation of its potentiality to be applied in the tumors targeted therapeutic strategy.