Ad-vcam-1-gfp重组腺病毒转染人脐血源基质细胞的实验研究

本研究探讨血管细胞黏附分子（vcam-1）修饰的人脐血源基质细胞（human umbilical cord blood derived strom cells，CBDSC）在造血调控中的作用。采用DNA重组技术，将目的基因vcam-1克隆至含有报告基因gfp的穿梭质粒；在BJ5183细胞中与pAdeasy—1质粒进行同源重组，产生重组腺病毒载体转染人脐血源基质细胞并进行鉴定。结果表明：vcam-1基因与pAdTrack—CMV载体成功连接，经NotⅠ／XhoⅠ双酶切后电泳可见2个大小约为9kb和2kb左右条带，经PCR法扩增后电泳可见1个600bp左右条带，证明pAdTrack—CMV—vcam-1重组质粒构建成功。pAdTrack—CMV—vcam-1质粒与pAdeasy—1质粒同源重组后，产物经PACⅠ酶切后电泳可观察到2个大小约为31kb、4kb左右条带，与预期结果相符。腺病毒载体转染人脐血源基质细胞后免疫化学、RT—PCR、荧光显微镜等方法均检测到目的基因vcam-1的表达。结论：构建ad—vcam-1-gfP重组腺病毒载体可成功转染人脐血源基质细胞并使其vcam-1表达增高。

Experimental Study of Human Umbilical Cord Blood Derived Stromal Cells Transfected with Recombinant Adenoviral Vector Co-expressing VCAM-1 and GFP

This study was aimed to investigate the effect of vcam-1 gene-modified human umbilical cord blood derived stromal cells (CBDSCs) on hematopoietic regulation so as to establish the experimental foundation for further study. The target gene vcam-1 was cloned into the shuttle plasmid with the report gene GFP. The recombinant shuttle plasmid was transformed into BJ5183 bacteria to recombine with backbone vector pAdeasy-l, and the recombinant adenoviral vector ad-vcam-1-gfp was confirmed after transfection with CBDSCs. The results indicated that two fragments of about 9 kb and 2 kb were obtained after digestion of recombinant plasmid pAdTrack-vcam-1 with NotIand XhoI, and single fragment of 600 bp was obtained after amplification with PCR; two fragments of about 31 kb and 4 kb were obtained after digestion of recombinant plasmid pad-vcam-1-gfp with PacI, which suggested a successful homologous recombination. The expression of vcam-1 gene in ad-vcam-1-gfp transfected CBDSCs could be detected by immunocytochemistry, RT-PCR and fluorescent microscopy. It is concluded that the recombinant adenoviral vector ad-vcam-1-gfp has been constructed successfully, and the expression of vcam-1 is up-regulated in CBDSCs transfected by gene ad-vcam-1-gfp.