Division of Virology, Medical University of Innsbruck, 6020 Innsbruck, Austria.
Christian Doppler Laboratory for Viral Immunotherapy of Cancer, Medical University of Innsbruck, 6020 Innsbruck, Austria.
Viruses. 2019 Feb 15;11(2):159. doi: 10.3390/v11020159.
A chimeric vesicular stomatitis virus with the glycoprotein of the lymphocytic choriomeningitis virus, VSV-GP, is a potent viral vaccine vector that overcomes several of the limitations of wild-type VSV. Here, we evaluated the potential of VSV-GP as an HIV vaccine vector. We introduced genes for different variants of the HIV-1 envelope protein Env, i.e., secreted or membrane-anchored, intact or mutated furin cleavage site or different C-termini, into the genome of VSV-GP. We found that the addition of the Env antigen did not attenuate VSV-GP replication. All HIV-1 Env variants were expressed in VSV-GP infected cells and some were incorporated very efficiently into VSV-GP particles. Crucial epitopes for binding of broadly neutralizing antibodies against HIV-1 such as MPER (membrane-proximal external region), CD4 binding site, V1V2 and V3 loop were present on the surface of VSV-GP-Env particles. Binding of quaternary antibodies indicated a trimeric structure of VSV-GP incorporated Env. We detected high HIV-1 antibody titers in mice and showed that vectors expressing membrane-anchored Env elicited higher antibody titers than vectors that secreted Envs. In rabbits, Tier 1A HIV-1 neutralizing antibodies were detectable after prime immunization and titers further increased after boosting with a second immunization. Taken together, VSV-GP-Env is a promising vector vaccine against HIV-1 infection since this vector permits incorporation of native monomeric and/or trimeric HIV-1 Env into a viral membrane.
一种嵌合的水疱性口炎病毒,其糖蛋白为淋巴细胞性脉络丛脑膜炎病毒(VSV-GP),是一种有效的病毒疫苗载体,克服了野生型 VSV 的几个局限性。在这里,我们评估了 VSV-GP 作为 HIV 疫苗载体的潜力。我们将 HIV-1 包膜蛋白 Env 的不同变体基因,即分泌型或膜锚定型、完整或突变的弗林裂解位点或不同的 C 末端,引入到 VSV-GP 的基因组中。我们发现,添加 Env 抗原不会减弱 VSV-GP 的复制。所有 HIV-1 Env 变体在感染 VSV-GP 的细胞中表达,并且一些变体非常有效地被整合到 VSV-GP 颗粒中。与 HIV-1 结合的广谱中和抗体的关键表位,如 MPER(膜近端外部区域)、CD4 结合位点、V1V2 和 V3 环,存在于 VSV-GP-Env 颗粒的表面。四价抗体的结合表明 VSV-GP 结合的 Env 是三聚体结构。我们在小鼠中检测到高 HIV-1 抗体滴度,并表明表达膜锚定 Env 的载体比分泌 Env 的载体诱导更高的抗体滴度。在兔子中,在初次免疫后可检测到 1A 类 HIV-1 中和抗体,在第二次免疫加强后,抗体滴度进一步增加。总之,VSV-GP-Env 是一种有前途的 HIV-1 感染疫苗载体,因为这种载体允许将天然的单体和/或三聚体 HIV-1 Env 掺入病毒膜中。
Pathogens. 2020-2-19
Cell Host Microbe. 2018-10-10
Cell Host Microbe. 2018-6-13
Biotechnol Genet Eng Rev. 2018-5-21