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Engineering a Virus-Like Particle as an Antigenic Platform for a Pfs47-Targeted Malaria Transmission-Blocking Vaccine.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-11-14 , DOI: 10.1038/s41598-019-53208-z
Lampouguin Yenkoidiok-Douti 1, 2 , Adeline E Williams 1, 3 , Gaspar E Canepa 1 , Alvaro Molina-Cruz 1 , Carolina Barillas-Mury 1
Affiliation  

We recently characterized Pfs47, a protein expressed on the surface of sexual stages and ookinetes of Plasmodium falciparum, as a malaria transmission-blocking vaccine (TBV) target. Mice immunization induced antibodies that conferred strong transmission-reducing activity (TRA) at a concentration of 200 μg/mL. Here, we sought to optimize the Pfs47 vaccine to elicit higher titers of high-affinity antibodies, capable of inducing strong TRA at a lower concentration. We report the development and evaluation of a Pfs47-based virus-like particle (VLP) vaccine generated by conjugating our 58 amino acid Pfs47 antigen to Acinetobacter phage AP205-VLP using the SpyCatcher:SpyTag adaptor system. AP205-Pfs47 complexes (VLP-P47) formed particles of ~22 nm diameter that reacted with polyclonal anti-Pfs47 antibodies, indicating that the antigen was accessible on the surface of the particle. Mice immunized with VLP-P47 followed by a boost with Pfs47 monomer induced significantly higher antibody titers, with higher binding affinity to Pfs47, than mice that received two immunizations with either VLP-P47 (VLP-P47/VLP-P47) or the Pfs47 monomer (P47/P47). Purified IgG from VLP-P47/P47 mice had strong TRA (83-98%) at concentrations as low as 5 μg/mL. These results indicate that conjugating the Pfs47 antigen to AP205-VLP significantly enhanced antigenicity and confirm the potential of Pfs47 as a TBV candidate.

中文翻译:

工程化病毒样颗粒作为针对Pfs47的疟疾传播阻断疫苗的抗原平台。

我们最近将Pfs47(一种在恶性疟原虫的性生活阶段和动植物的表面表达的蛋白)定为疟疾传播阻断疫苗(TBV)的靶标。小鼠免疫诱导的抗体在200μg/ mL的浓度下具有很强的递减传播活性(TRA)。在这里,我们试图优化Pfs47疫苗,以引发更高滴度的高亲和力抗体,从而能够在较低浓度下诱导强TRA。我们报告通过使用SpyCatcher:SpyTag适配器系统将我们的58个氨基酸的Pfs47抗原缀合到不动杆菌噬菌体AP205-VLP上而产生的基于Pfs47的病毒样颗粒(VLP)疫苗的开发和评估。AP205-Pfs47复合物(VLP-P47)形成了直径约22 nm的颗粒,可与多克隆抗Pfs47抗体反应,表明抗原在颗粒表面上是可及的。与接受两次VLP-P47(VLP-P47 / VLP-P47)或Pfs47单体免疫的小鼠相比,用VLP-P47免疫后再用Pfs47单体免疫的小鼠诱导的抗体效价明显更高,与Pfs47的结合亲和力更高。 (P47 / P47)。来自VLP-P47 / P47小鼠的纯化IgG在低至5μg/ mL的浓度下具有很强的TRA(83-98%)。这些结果表明,将Pfs47抗原与AP205-VLP缀合可显着增强抗原性,并证实了Pfs47作为TBV候选物的潜力。与接受两次VLP-P47(VLP-P47 / VLP-P47)或Pfs47单体(P47 / P47)免疫的小鼠相比。来自VLP-P47 / P47小鼠的纯化IgG在低至5μg/ mL的浓度下具有很强的TRA(83-98%)。这些结果表明,将Pfs47抗原与AP205-VLP缀合可显着增强抗原性,并证实了Pfs47作为TBV候选物的潜力。与接受两次VLP-P47(VLP-P47 / VLP-P47)或Pfs47单体(P47 / P47)免疫的小鼠相比。来自VLP-P47 / P47小鼠的纯化IgG在低至5μg/ mL的浓度下具有很强的TRA(83-98%)。这些结果表明,将Pfs47抗原与AP205-VLP缀合可显着增强抗原性,并证实了Pfs47作为TBV候选物的潜力。
更新日期:2019-11-14
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