小鼠MIP-1α真核表达质粒的构建及在HSV-Ⅱ核酸疫苗中的应用

目的：构建小鼠巨噬细胞炎性蛋白-1α（MIP-1α）的真核表达质粒,观察其作为分子佐剂对单纯疱疹病毒Ⅱ型（HSV-Ⅱ）DNA疫苗免疫效果的影响.方法：以LPS刺激RAW264.7细胞提取总RNA.采用RT-PCR扩增出MIP-1α基因的全部编码序列,利用克隆载体pUCm-T,将其亚克隆入pcDNA3中,构建出小鼠MIP-1α的真核表达质粒Pm;将其转染COS-7细胞,并用Boyden趋化小室法检测MIP-1α的生物学活性.然后用其与HSV-ⅡgD的DNA疫苗一起免疫BALB/c小鼠,检测免疫小鼠的特异性抗体、脾T细胞增殖反应及病毒攻击小鼠后对小鼠的保护率,观察MIP-1α对HSV-Ⅱ DNA疫苗免疫效果的影响.结果：成功构建了小鼠MIP-1α的重组真核表达质粒;免疫BALB/c小鼠发现,其作为分子佐剂可加强HSV-ⅡgDNA疫苗的免疫效果.结论：小鼠MIP-1α可作为HSV-Ⅱ gD DNA疫苗的分子佐剂,为研制新型有效的HSV-Ⅱ DNA疫苗提供一定的依据.

Construction of recombinant eukaryotic expression plasmid of murine chemokine MIP-1α and coimmunization with HSV-Ⅱ DNA vaccine

AIM: To construct the recombinant eukaryotic expression plasmid of murine macrophage inflammatory protein-1alpha (MIP-1alpha) and investigate the effect of MIP-1alpha as an adjuvant on immune response induced by herpes simplex virus type II glycoprotein D (HSV-II gD) DNA vaccine. METHODS: Using total RNA from RAW264.7 cells stimulated with LPS, the whole code sequence of murine MIP-1alpha was amplified by RT-PCR and inserted into pcDNA3 at Hind III/Xba I restriction sites. The recombinant eukaryotic expression plasmid Pm was transiently expressed in COS-7 cells and its specificity was demonstrated by RT-PCR and Boyden chemotaxis chamber assay. BALB/c mice were immunized with gD DNA vaccine and/or MIP-1alpha, and the effect of MIP-1alpha on gD DNA vaccine was evaluated by detecting anti-HSV-II antibody, antigen-specific lymphoproliferative responses, and examining survival rates after mice were challenged intravaginally with HSV-II. RESULTS: The recombinant eukaryotic expression plasmid of murine MIP-1alpha was constructed, and it was revealed that immune responses of HSV-II gD DNA vaccine were enhanced by coimmunization with MIP-1alpha. CONCLUSION: The murine MIP-1alpha can be used as an adjuvant of HSV-II gD DNA vaccine.