HIV-1缺损慢病毒载体的高滴度制备及其介导的高效基因转移

近来,慢病毒载体引起了极大关注,己成为转基因操作中重要的工具。用编码病毒组份的三质粒系统共转染293T包装细胞系,建立了大量制备HIV-1缺损慢病毒载体的方法,病毒载体的度可达到1.1×107IU/mL,离心浓缩可将载体滴度提高100倍以上。HIV-1缺损慢病毒载体可以高效转导人淋巴瘤等多种来源的细胞,RT-PCR检测显示外源基因GFP稳定表达达18个月以上,长期传代观测未检出p24抗原蛋白或可复制病毒。

High-titer preparation of HIV-1-based defective lentivector and it mediated efficient gene transfer

Lentivectors have drawn considerable attention recently and become important delivery vehicles for gene transfer manipulation. By Transiently co-transfecting 293T packaging cells with three DNA plasmids system encoding lentivector constituents, a protocol for bulky preparation of human immunodeficiency virus type-1 (HIV-1)-based defective lentivector with high titer has been established. Transient co-transfection of 293T packaging cells resulted in production of high-titer vector (1.1×107IU/ml), which can be further concentrated over 100-fold through a single step centrifugation. The vector was capable of efficiently transducing a variety of cells from both primate and non-primate sources, including of human T-lymphoblastoid cell line. Long-term culture of vector transduced cells showed a stable expression of foreign gene over 18 months detected by RT-PCR. Assessment of potential generation of replication-competent virus revealed no detection of p24 antigen protein or infectious particles in vector-transduced cells.