Vaccine-elicited human T cells recognizing conserved protein regions inhibit HIV-1.

Vaccine-elicited human T cells recognizing conserved protein regions inhibit HIV-1.
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疫苗吸引的人T细胞识别保守的蛋白质区域抑制HIV-1。

DOI:
10.1038/mt.2013.248
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发表时间:
2014-02
期刊:
Molecular therapy : the journal of the American Society of Gene Therapy
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病毒多样性和逃避免疫反应是开发有效的HIV-1疫苗的最大挑战。我们假设,针对HIV-1蛋白质组最保守区域的T细胞疫苗,这是大多数变体所共有的,突变时会产生适应性成本,将产生有效识别和杀死病毒感染细胞的效应子,在传播后足够早,可能影响HIV-1复制,并且比基于全蛋白的T细胞疫苗更有效。在这里,我们描述了有史以来第一次管理的保守的免疫原疫苗载体使用引物-加强方案的DNA,猿猴腺病毒和修改的牛痘病毒安卡拉未感染的英国志愿者。该疫苗诱导高水平的效应T细胞,识别病毒感染的自体CD 4+细胞,并抑制HIV-1复制高达5.79 log 10。病毒抑制由Gag-和Pol-特异性效应CD 8 + T细胞介导,所述效应CD 8 + T细胞靶向在自然感染中通常是次显性的表位。这些结果为使用疫苗靶向保守表位的T细胞提供了概念证明,表明这些T细胞可以在体外控制HIV-1复制。
Virus diversity and escape from immune responses are the biggest challenges to the development of an effective vaccine against HIV-1. We hypothesized that T-cell vaccines targeting the most conserved regions of the HIV-1 proteome, which are common to most variants and bear fitness costs when mutated, will generate effectors that efficiently recognize and kill virus-infected cells early enough after transmission to potentially impact on HIV-1 replication and will do so more efficiently than whole protein-based T-cell vaccines. Here, we describe the first-ever administration of conserved immunogen vaccines vectored using prime-boost regimens of DNA, simian adenovirus and modified vaccinia virus Ankara to uninfected UK volunteers. The vaccine induced high levels of effector T cells that recognized virus-infected autologous CD4+ cells and inhibited HIV-1 replication by up to 5.79 log10. The virus inhibition was mediated by both Gag- and Pol- specific effector CD8+ T cells targeting epitopes that are typically subdominant in natural infection. These results provide proof of concept for using a vaccine to target T cells at conserved epitopes, showing that these T cells can control HIV-1 replication in vitro.
HIV-1 GAG中的簇突变是逃避HLA-B27限制的细胞毒性T淋巴细胞反应所必需的。
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