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Calcium Phosphate Nanoparticle-Based Vaccines as a Platform for Improvement of HIV-1 Env Antibody Responses by Intrastructural Help

机译:基于磷酸钙纳米粒子疫苗作为通过核心助助性改善HIV-1 ENV抗体反应的平台

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摘要

Incorporation of immunodominant T-helper epitopes of licensed vaccines into virus-like particles (VLP) allows to harness T-helper cells induced by the licensed vaccines to provide intrastructural help (ISH) for B-cell responses against the surface proteins of the VLPs. To explore whether ISH could also improve antibody responses to calcium phosphate (CaP) nanoparticle vaccines we loaded the nanoparticle core with a universal T-helper epitope of Tetanus toxoid (p30) and functionalized the surface of CaP nanoparticles with stabilized trimers of the HIV-1 envelope (Env) resulting in Env-CaP-p30 nanoparticles. In contrast to soluble Env trimers, Env containing CaP nanoparticles induced activation of naïve Env-specific B-cells in vitro. Mice previously vaccinated against Tetanus raised stronger humoral immune responses against Env after immunization with Env-CaP-p30 than mice not vaccinated against Tetanus. The enhancing effect of ISH on anti-Env antibody levels was not attended with increased Env-specific IFN-γ CD4 T-cell responses that otherwise may potentially influence the susceptibility to HIV-1 infection. Thus, CaP nanoparticles functionalized with stabilized HIV-1 Env trimers and heterologous T-helper epitopes are able to recruit heterologous T-helper cells induced by a licensed vaccine and improve anti-Env antibody responses by intrastructural help.
机译:许可的疫苗的免疫显性的T辅助表位掺入病毒样颗粒(VLP)允许通过该许可的疫苗诱导的,以提供intrastructural帮助(ISH),用于抵靠VLP的表面蛋白的B细胞应答的线束的T辅助细胞。探索ISH是否也能提高到磷酸钙抗体应答(CAP)纳米颗粒疫苗我们装载有破伤风的通用T辅助表位的纳米颗粒核类毒素(P30)和官能化的CaP纳米颗粒的表面与所述HIV-1的稳定的三聚体包膜(Env),得到的Env-CAP-P30纳米颗粒。与此相反,以可溶性的Env三聚体,含有的Env纳米颗粒的CaP诱导幼稚Env特异性B细胞在体外的活化。以前对破伤风疫苗接种的小鼠与包膜蛋白CAP-P30比未接种破伤风小鼠免疫后产生抗包膜更强的体液免疫应答。 ISH对抗包膜蛋白的抗体水平的提高效果不与参加Env特异性增加IFN-γ,否则可能会潜在地影响易感性HIV-1感染的CD4 T细胞应答。因此,稳定的抗HIV-1包膜三聚体和异源的T辅助细胞表位功能的CaP纳米颗粒能够招募由持牌疫苗诱导异源的T辅助细胞和改善intrastructural帮助抗包膜蛋白的抗体反应。

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