[摘 要] 目的: 采用体外连接法构建和制备重组腺病毒Adeno-X-LacZ，为构建具有治疗价值的重组腺病毒载体奠定基础。 方法: PI-Sce Ⅰ/I-Ceu Ⅰ酶切pShuttle2-LacZ穿梭质粒，回收4.6 kb的LacZ基因表达盒，与经过相同酶切的Adeno-X病毒DNA连接，连接产物用SwaⅠ酶切，最终产物转化DH5α。重组质粒用PCR法和PI-Sce Ⅰ/I-Ceu Ⅰ酶切鉴定。pAdeno-X-LacZ用PacⅠ线性化后，用脂质体介导其转染至AD293细胞内包装扩增出重组腺病毒颗粒，采用CsCl密度梯度离心法纯化重组腺病毒Adeno-X-LacZ。采用X-gal染色观察Adeno-X-LacZ在AD293细胞内包装和HVSMC表达情况。 结果: PCR扩增可见312 bp特异性条带，PI-Sce Ⅰ/I-Ceu Ⅰ酶切重组质粒后释放出4.6 kb LacZ基因表达盒。X-gal染色证实了在AD293细胞内成功扩增包装出重组腺病毒Adeno-X-LacZ和LacZ基因在HVSMC中得到有效表达。 结论: 体外连接法是一种快速、简便、高效的构建重组腺病毒质粒的方法，本研究为构建具有治疗价值的重组腺病毒奠定了基础，Adeno-X-LacZ为研究腺病毒介导的基因转移提供了一良好的对照载体。

    [关键词] 体外连接;腺病毒;β-半乳糖苷酶;PI-SceⅠ;I-CeuⅠ

    A Rapid and Efficient Method for Constructing Recombinant Adenoviral Vector Expressing β-galactosidase by in Vitro Ligation WANG Jia-ning1, WANG Chuan-cheng2, GUO Ling-yun1, HUANG Yong-zhang1 (1Institute of Clinical Medicine, Renmin Hospital, Yunyang Medical College, Shiyan, Hubei 442000, China; 2Yunxi Renmin Hospital,Yunxi, Hubei 442600, China)

    Abstract: Objective To construct recombinant adenoviral vector expressing β-galactosidase by in vitro ligation and provide a basis for construction of recombinant adenovirus vector expressing therapeutic gene of interest.Methods pShuttle2-LacZ was digested with PI-Sce Ⅰ/I-Ceu Ⅰand 4.6 Kb fragment of LacZ gene expression cassette was recovered .This fragment was ligated to predigested Adeno-X viral DNA with PI-Sce Ⅰ/I-Ceu Ⅰ. The ligated product was digested with Swa Ⅰ.The resultant DNA was transformed into E. Coli. DH5α.The correct recombinant plasmid, pAdeno-X-LacZ ,was identified by PCR and PI-Sce Ⅰ/I-Ceu Ⅰdigestion. The Pac I-digested, linearized pAdeno-X-LacZ was transfected into AD293 cells by Lipofectamine. Recombinant adenovirus , Adeno-X-LacZ, was purified with CsCl density gradient ultracentrifugation. HVSMC was infected with Adeno-X-LacZ. X-gal staining was performed to monitor the expression of β-galactosidase gene. Results There was a specific band of 312bp when pAdeno-X-LacZ was amplified by PCR. PI-SceⅠ/I-CeuⅠdigestion of pAdeno-X-LacZ released 4.6Kb of LacZ gene fragment. X-gal staining confirmed Adeno-X-LacZ was packaged successfully within AD293 cells and the expression of β-galactosidase gene in HVSMC. Conclusion In vitro ligation is a simple, rapid and efficient method for constructing recombinant adenoviral vector. This study provides a basis for construction of recombinant adenoviral vector carrying therapeutic gene of interest, Adeno-X-LacZ is also a useful control vector for the research of gene transfer mediated by recombinant adenovirus. ......