整合素靶向性病毒载体对肿瘤细胞基因转导的促进作用

在进行基因导入研究及临床试验中，目前采用的载体通常包括了病毒及非病毒两大类。对于非病毒载体用于基因转染有许多报道。而腺病毒作为基因载体，因其具有的高效转导能力及对分裂或非分裂细胞均能转导等优点而被广泛应用于针对疾病的基因治疗中。对腺病毒进入细胞机制进行的深入研究结果发现，腺病毒与细胞结合的第一步是与细胞表面的柯萨奇腺病毒受体（coxsackie adenovirus receptor，CAR）结合，第二步是利用其在五角体基（pentonbase）中的RGD序列和细胞表面的整合素结合，

Gene expression of tumor cells both in vitro and in vivo enhanced by integrin-targeting adenovirus vector

Aim To construct an efficient recombinant viral vector for gene therapy.Methods(First-generation) adenovirus(Ad) vector was modified with the RGD peptide inserted into the fiber.Both in vitro and in vivo experiments of gene expression in different tumor cells with conventional and recombinant vectors were conducted.RT-PCR was used for detecting the expression of coxackievirus and adenovirus receptor and integrin at the surface of Meth-A cells.Results Fiber-mutant adenovirus vector showed a notably enhanced gene expression in A2058,B16BL6,OV-HM,and Meth-A tumor cells compared with that of conventional ones.In vivo study carried out using Meth-A tumor-bearing mice also demonstrated that the intra-tumoral injection of recombinant adenovirus induced strong gene expression in these CAR-deficient tumor cells. Conclusion The recombinant vector can be a promising one for effective cancer gene therapy.