基孔肯雅病毒样颗粒的制备及免疫原性研究

摘要

目的 评价基孔肯雅病毒(CHIKV)病毒样颗粒(VLPs)免疫原性.方法 通过构建CHIKV结构蛋白编码基因C-E3-E2-6K-E1昆虫细胞表达载体,然后与杆状病毒线性DNA共转染SF9昆虫细胞制备重组杆状病毒,感染悬浮培养的SF9细胞制备VLPs.IFA、SDS-PAGE和Western-Blot法对表达产物进行鉴定分析,用纯化VLPs免疫BALB/c小鼠,评价免疫原性.结果 CHIKV结构蛋白装配形成病毒样球形颗粒,免疫小鼠可诱导CHIKV特异性抗体,能够有效中和CHIKV感染Vero细胞.结论 CHIKV VLPs能够通过杆状病毒系统在昆虫细胞中有效分泌表达,并具有较强免疫原性,为基于CHIKV VLPs的免疫学检测试剂乃至疫苗的研制奠定了基础.%Objective To prepare the virus-like particles (VLPs) of Chikungunya virus (CHIKV) and evaluate the immunogenicity.Method CHIKV structural protein C-E3-E2-6K-E1 encoding gene were amplified by fusion PCR,and cloned into an insect cell expression vector.The recombinant Baculovirus were recovered by co-transfection of the expression plasmid with baculovirus linear DNA into SF9 insect cells,and CHIKV VLPs were prepared from suspension culture SF9 cells.Structural proteins expression were analyzed using IFA,SDS-PAGE and Western-Blot,and morphological analysis via electron microscopy.Result Which showed that CHIKV structural proteins were secreted into the cell culture supernatant and assembled into virus-like spherical particles.BALB /c mice were immunized with the VLPs,high levels of CHIKV specific antibodies were detected in the sera,and CHIKV infection of Vero cells could be effectively neutralized.Couclusion The results showed that CHIKV VLPs can be efficiently produced by the baculovirus expression system in insect cells,and specific IgG and neutralization antibodies could be induced in mice after VLPs immunization.This research laid the foundation for the development of CHIKV VLPs based on immunological detection reagents and even vaccines.