Sepulveda P, Hontebeyrie M, Liegeard P, Mascilli A, Norris K A
Department of Immunology, Pasteur Institute, Paris 15, France.
Infect Immun. 2000 Sep;68(9):4986-91. doi: 10.1128/IAI.68.9.4986-4991.2000.
A complement regulatory protein (CRP) of Trypanosoma cruzi was evaluated as a vaccine candidate in a murine model of experimental T. cruzi infection. Recombinant CRP derived from an Escherichia coli expression system and a plasmid encoding the full-length crp structural gene under the control of a eukaryotic promoter were used to immunize BALB/c mice. Immunization with both protein and DNA vaccines resulted in a Th1-type T-cell response, comparable antibody titers, and similar immunoglobulin G isotype profiles. Only mice immunized with the crp DNA plasmid produced antibodies capable of lysing the parasites in the presence of complement and were protected against a lethal challenge with T. cruzi trypomastigotes. These results demonstrate the superiority of DNA immunization over protein immunization with the recombinant CRP. The work also supports the further investigation of CRP as a component of a multigene, anti-T. cruzi DNA vaccine.
在克氏锥虫实验性感染的小鼠模型中,对克氏锥虫的一种补体调节蛋白(CRP)作为候选疫苗进行了评估。源自大肠杆菌表达系统的重组CRP以及在真核启动子控制下编码全长crp结构基因的质粒被用于免疫BALB/c小鼠。蛋白质疫苗和DNA疫苗免疫均导致Th1型T细胞反应、相当的抗体滴度和相似的免疫球蛋白G同种型谱。只有用crp DNA质粒免疫的小鼠产生了在补体存在下能够裂解寄生虫的抗体,并受到了克氏锥虫锥鞭毛体致死攻击的保护。这些结果证明了DNA免疫相对于重组CRP蛋白质免疫的优越性。这项工作还支持进一步研究将CRP作为多基因抗克氏锥虫DNA疫苗的一个组成部分。