Immunization with Transgenic Rodent Malaria Parasites Expressing Pfs25 Induces Potent Transmission-Blocking Activity.

Immunization with Transgenic Rodent Malaria Parasites Expressing Pfs25 Induces Potent Transmission-Blocking Activity.
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表达PFS25的转基因啮齿动物疟疾的免疫可引起有效的传输障碍活性。

DOI:
10.1038/s41598-017-18831-8
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发表时间:
2018-01-25
期刊:
影响因子:
4.6
通讯作者:
Blagborough AM
Blagborough AM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sala KA;Angrisano F;Da DF;Taylor IJ;Churcher TS;Blagborough AM

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抗疟疾传播阻断疫苗(TBV)将是控制或消除疾病的重要工具,尽管目前的候选疫苗在临床研究中未能产生高效力。动合子表面蛋白P25是TBV发展的主要靶标,但是具有适当构象的P25的异源表达是有问题的,并且是实现功能滴度的先决条件。重组/亚单位疫苗的一种潜在替代方案是用非致病性全寄生虫疫苗免疫。本研究检测了纯化的转基因啮齿类疟疾寄生虫(PbPfs 25 DR 3),在伯氏疟原虫动合子表面上以天然构象表达恶性疟原虫P25,作为TBV的能力。用纯化的PbPfs 25 DR 3动合子接种疫苗在实验室中产生了有效的抗Pfs 25应答和高传播阻断效力,然后将这些发现转化为对布基纳法索感染个体的恶性疟原虫天然田间分离株的实验。在实验室和现场证明了有效性(传播强度分别降低高达93.3%/97.1%),采用一次和两次加强的同源策略,并作为初免-加强方案的一部分,为未来开发全寄生虫TBV提供支持。
An anti-malarial transmission blocking vaccine (TBV) would be an important tool for disease control or elimination, though current candidates have failed to induce high efficacy in clinical studies. The ookinete surface protein P25 is a primary target for TBV development, but heterologous expression of P25 with appropriate conformation is problematic and a pre-requisite for achieving functional titers. A potential alternative to recombinant/sub-unit vaccine is immunization with a non-pathogenic, whole-parasite vaccine. This study examines the ability of a purified transgenic rodent-malaria parasite (PbPfs25DR3), expressing Plasmodium falciparum P25 in native conformation on the P. berghei ookinete surface, to act as a TBV. Vaccination with purified PbPfs25DR3 ookinetes produces a potent anti-Pfs25 response and high transmission-blocking efficacy in the laboratory, findings that are then translated to experimentation on natural field isolates of P. falciparum from infected individuals in Burkina Faso. Efficacy is demonstrated in the lab and the field (up to 93.3%/97.1% reductions in transmission intensity respectively), with both a homologous strategy with one and two boosts, and as part of a prime-boost regime, providing support for the future development of a whole-parasite TBV.
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