为了将角质生长因子(KGF)基因通过腺病毒载体转染到间充质干细胞(MSC)中,增强MSC胸腺修复功能,利用DNA重组技术,将目的基因KGF克隆到含有报告基因EGFP的穿梭质粒中,然后再将构建的重组穿梭质粒转移至pAdxsi载体中,构建重组腺病毒载体质粒,继而在H293细胞中包装、扩增,并测定病毒滴度.转染至小鼠骨髓MSC中,为胸腺组织修复免疫功能恢复提供前期实验基础.结果表明:重组穿梭质粒pShuttle-GFP-mKGF重组穿梭质粒经酶切鉴定得到0.6kh和5.1 kb 2个条带；重组腺病毒载体质粒pAdxsi-mKGF病毒质拉经酶切鉴定得到阳性克隆；测定重组腺病毒Ad-EGFP-mKGF半数组织培养感染量的滴度为1.6×1010 pfu/ml.转染后10 hMSC开始表达荧光,6-8 d达高峰,转染率可达92.3％,28d仍有表达.结论:pAdxsi-mKGF病毒质粒构建成功并能高效、安全地转染MSC.%To construct the adenoviral vector with co-expressing keratinocyte growth factor (KGF) and enhanced green fluorescent protein (EGFP) for transfection into the mesenchymal stem cells (MSC), the targel gene KGF was cloned into the shuttle plasmid with the report gene EGFP, then the recombinant shuttle plasmid was transformed into DH5a bacteria to recombine with backbone vector pAdxsi. Next, the plasmid pAd-EGFP-mKGF was amplified in H293 cells and the viral titer was determined. The MSC were separated and enriched by using bone marrow adherent culture and identified in vitro to observe Ihe efficiency of transfection. The results indicated that the recombinant shuttle plasmid pShuttle-EGFP-mKGF digested with restriction endonucleases was confirmed by two products which length was about 0.6 kb and 5.1 kb, respectively; the recombinant plasmid pAdxsi-EGFP-mKGF digested with restriction endonucleases was confirmed by 7 products; recornbinant adenoviral vector Ad-EGFP-mKGF was amplified to titer of 1.6 × 1010pfu/ ml. At 10 h after Iransfecting MSC began to express fluorescence at 6 to 8 days later, the fluorescence reached to the peak with infection rate of 92.3% , at 28 days the expression of fluorescence was still observed. It is concluded that the recombinant adenoviral vector Ad-EGFP-mKGF is successfully constructed and can transfect MSC effectively and safely.
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