Special Pathogens Program, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba R3E 3R2, Canada.
Sci Transl Med. 2012 Oct 31;4(158):158ra146. doi: 10.1126/scitranslmed.3004582.
Ebola virus causes severe hemorrhagic fever in susceptible hosts. Currently, no licensed vaccines or treatments are available; however, several experimental vaccines have been successful in protecting rodents and nonhuman primates (NHPs) from the lethal Zaire ebolavirus (ZEBOV) infection. The objective of this study was to evaluate immune responses correlating with survival in these animals after lethal challenge with ZEBOV. Knockout mice with impaired ability to generate normal T and/or B cell responses were vaccinated and challenged with ZEBOV. Vaccine-induced protection in mice was mainly mediated by B cells and CD4(+) T cells. Vaccinated, outbred guinea pigs and NHPs demonstrated the highest correlation between survival and levels of total immunoglobulin G (IgG) specific to the ZEBOV glycoprotein (ZGP). These results highlight the relevance of total ZGP-specific IgG levels as a meaningful correlate of protection against ZEBOV exposure.
埃博拉病毒可导致易感宿主发生严重的出血热。目前，尚无获得许可的疫苗或治疗方法可用；然而，一些实验性疫苗已成功地保护啮齿动物和非人灵长类动物（NHPs）免受致命的扎伊尔埃博拉病毒（ZEBOV）感染。本研究的目的是评估在这些动物中与在致命的 ZEBOV 攻击后的存活相关的免疫反应。用无法产生正常 T 和/或 B 细胞反应的能力受损的基因敲除小鼠进行疫苗接种和 ZEBOV 攻击。疫苗诱导的小鼠保护主要由 B 细胞和 CD4(+)T 细胞介导。接种疫苗的、杂交的豚鼠和 NHPs 显示出存活与针对 ZEBOV 糖蛋白（ZGP）的总免疫球蛋白 G（IgG）特异性之间的最高相关性。这些结果突出了总 ZGP 特异性 IgG 水平作为针对 ZEBOV 暴露的保护的有意义的相关性。
