腺相关病毒和慢病毒作为小干扰RNA转运载体的比较

目的 观察以腺相关病毒(adeno-associated virus,AAV)和慢病毒(Lenti virus)为载体、含有针对大鼠金属蛋白酶组织抑制因子(tissue inhibitor of metalloproteinase,TIMP)-1、具有较强抑制作用的小干扰RNA(small interfering RNA,siRNA)感染大鼠肝星状细胞系(hepatic stellate cell,HSC)-T6的感染效率和其对TIMP-1的表达抑制作用.方法 挑选针对大鼠TIMP-1基因具有较强抑制作用的siRNA序列,在体外构建为短发夹表达载体后,将其包装为重组AAV/siRNA-TIMP-1/GFP和Lenti/siRNA-TIMP-1/GFP,同时包装阴性对照AAV/GFP和Lenti/GFP,并以MOI=10感染大鼠肝星状细胞系HSC-T6,感染后72 h,通过流式细胞仪及荧光显微镜观察病毒的感染效率.在感染后7 d,应用Western bloting方法检测TIMP-1蛋白表达情况.结果 感染HSC-T6后细胞形态、增生速度未发生明显变化.通过流式细胞仪及荧光显微镜证实感染效率分别为:空载体AAV/GFP和Lenti/GFP组分别为72.7%和70.0%,AAV/siRNA.TIMP-1/GFP和Lenti/siRNA-TIMP-1/GFP感染组分别为64.58%和61.86%.与正常细胞相比,感染后7 d,siRNA感染组TIMP-1蛋白表达均下降约40.0%,但两组siRNA感染组下降幅度无统计学意义.结论 构建的重组AAV/siRNA-TIMP-1/GFP和Lenti/siRNA.TIMP-1/GFP均可有效感染大鼠HSC-T6,感染效率相近,且均可在短期内有效抑制大鼠肝星状细胞系HSC-T6 TIMP-1蛋白的表达.

Comparison between the adeno-associated virus and lentivirus as small interfering RNA carrying vector

Objective To construct recombinant adeno-associated virus and lentivirus carrying siRNA of TIMP-1 and to investigate the efficiency of infection and short-term inhibitory effect of TIMP-1 gene expres-sion on rat hepatic stellate cells. Methods One pair of siRNA which could effectively inhibit expression of the TIMP-1 gene in HSC-T6 was screened and cloned into AAV vector and lentiviral vector to construct the recombinant AAV/siRNA-TIMP-1/GFP and Lenti/siRNA-TIMP-1/GFP. AAV/GFP and Lenti/GFP as neg-ative control were also obtained. Experiments were assigned to five groups: AAV/siRNA-TIMP-1/GFP, AAV/GFP, Lenti/siRNA-TIMP-1/GFP, Lenti/GFP group and mock group. Rat HSC-T6 cells were infected by these recombinant viruses at a concentration of MOI by 10. To monitor the efficiency of infection, fluores-cence microscope and flow cytometer were used. After 7 d post-infection, Western blot was used to detect the TIMP-1 protein expression. Results HSC-T6 had no significant changes after infection. The efficiency of infection in AAV/GFP and Lenti/GFP group were 72.7% and 70.0%, AAV/siRNA-TIMP-1/GFP and Lenti/siRNA-TIMP-1/GFP group were 64.58% and 61.86%. The protein expression levels of TIMP-1 in HSC-T6 cells at 7 d post-infection by the recombinant AAV and Lentivirus were decreased 40.0% compared with those in mock control and normal HSC-T6 (P<0.05). Conclusion Recombinant AAV/siRNA-TIMP-1/GFP and Lenti/siRNA-TIMP-1/GFP could effectively infect HSC-T6 with similar efficiency and suppress the expression of TIMP-1 in rat HSC-T6 remarkably.