CMVpp65基因修饰的树突状细胞刺激自身T细胞活化

巨细胞病毒（CMV）感染易发生于慢性移植物抗宿主病（cGVHD）患者，其特异性免疫依赖于T细胞活性。本研究探讨CMVpp65基因修饰的树突状细胞（DC）对自身T细胞的活化作用。采用具有高效转染非分裂细胞的慢病毒系统将CMV全长pp65基因导入鼠源性DC；采用CpG—DNA诱导DC细胞成熟；采用流式细胞术及免疫荧光方法测定T淋巴细胞抗原及IFNγ表达。结果表明：慢病毒感染DC的感染复数（multiplicity of infection，MOI）为50，最佳感染效率可达30％-40％；表达pp65基因的成熟DC能刺激自身naiveT细胞表达CD69；表达PP65蛋白的成熟DC能够刺激自身CD4^＋或CD8^＋T细胞分泌IFNγ。结论：pp65基因修饰、CpG—DNA诱导成熟的DC能体外激活CMV特异性T淋巴细胞。

CMV pp65 Gene Modified Dendritic Cells Activate Autologous T Cells

Cytomegalovirus (CMV) infection is a dangerous complication in patients with chronic graft versus host disease (cGVHD). CMV-specific immunity depends on the activity of T cells. This study was aimed to investigate the effect of CMV pp65 gene modified dendritic cells (DCs) on activation of autologous T cells. Lentivirus system was utilized to introduce the CMV full-length pp65 gene into mouse DCs; CpG-DNA was used to induce mature DCs; flow cytometry and immunofluorescence were used to determine the expression of antigen and IFNgamma in T lymphocytes. The results showed that the DCs were infected with lentivirus at a multiplicity of infection (MOI) of 50 with optimal infectious efficiency of 30%-40%; mature DCs expressing pp65 gene could stimulate autologous naive T cells to express CD69 specifically; mature DCs expressing PP65 could stimulate autologous CD4+ or CD8+ T cells to produce IFNgamma. It is concluded that CMV pp65-modified and CpG-DNA-induced mature DCs can activate CMV-specific T lymphocytes in vitro.