Expression of human clotting factor Ⅸ mediated by recom- binant lentiviral vector in cultured cells and hemophilia B mice

To explore the expression of human clotting factor Ⅸ (hFⅨ) cDNA in vitro and the feasibility of gene therapy for hemophilia B mice mediated by recombinant lentiviral vector, a recombinant hFⅨ lentiviral vector driven by ubiquitin-C promoter, FUXW, and by ABP liver specific promoter, FAXW, was constructed respectively. Recombinant lentivirus was harvested from 293T cells by calcium phosphate-mediated transient cotransfection of three plasmids (transgene vector, CMV腞8.2, VSV-G). hFⅨ expression was detected in supernatant of 293T, BHK and L-02 cells infected with FUXW virus, whereas higher expression of hFⅨ levels (630 ng/106 cells/48 h) was detected only in L-02 cells infected with FAXW virus. Serum hFⅨ antigen was detected in all hemophilia B mice treated with FAXW virus by tail vein injection, an efficiency level of hFⅨ was observed (45 ng/mL, approximately 1% of normal human levels), the expression lasted for more than 60 d. The results indicated that HIV-based lentiviral vectors offer a promising approach to the gene therapy of hemophilia B.

结肠灌注重组腺相关病毒2/人凝血因子Ⅸ基因载体治疗血友病B的安全性研究

目的分析结肠灌注重组腺相关病毒2/人凝血因子Ⅸ(rAAV2/CMV-hFⅨ)基因载体治疗血友病B小鼠的安全性。方法将rAAV2/CMV-hFⅨ(剂量为1×1013 v.g/kg)结肠灌注血友病B模型小鼠,分别检测抗重组腺相关病毒2(rAAV2)抗体和抗人凝血因子Ⅸ(hFⅨ)抗体,并通过组织病理学、免疫组化和PCR技术分析病毒和hFⅨ的组织分布。结果灌注后,在小鼠体内能够检测到抗rAAV2抗体和抗hFⅨ抗体;组织病理学、免疫组化和PCR技术分析结果显示灌注部位肠组织无明显病理改变,rAAV2以及hFⅨ基因仅仅在灌注的肠上皮。结论结肠灌注重组腺相关病毒基因治疗血友病B小鼠,在所观测时间内是安全的。