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Lymphoid reservoirs of antigen-specific memory T helper cells

机译:抗原特异性记忆T辅助细胞的淋巴库

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How vaccines control the development of antigen-specific effector and memory T helper cells is central to protective immunity but remains poorly understood. Here we found that protein vaccination selected high-affinity, CXCR5(+)ICOS(hi) follicular B-helper T cells (T-FH cells) that developed in draining lymphoid tissue to regulate B cell responses. In the memory phase, reservoirs of antigen-specific CXCR5(+)ICOS(lo) T-FH cells persisted with less effector activity but accelerated antigen-recall ability. This new compartment of memory T-FH cells was retained in draining lymphoid sites with antigen-specific memory B cells, persistent complexes of peptide and major histocompatibility complex class II and continued expression of CD69. Thus, protein vaccination promotes B cell immunity by selecting high-affinity effector T-FH cells and creating lymphoid reservoirs of antigen-specific memory T-FH cells in vivo.
机译:疫苗如何控制抗原特异性效应子和记忆T辅助细胞的发育是保护性免疫的关键,但仍知之甚少。在这里,我们发现蛋白质疫苗接种选择了高亲和力的CXCR5(+)ICOS(hi)滤泡性B辅助性T细胞(T-FH细胞),其在引流淋巴样组织中发育以调节B细胞反应。在记忆阶段,抗原特异性CXCR5(+)ICOS(Io)T-FH细胞的储库持续存在,但效应子活性较低,但抗原记忆能力却提高了。这种新的记忆T-FH细胞区室保留在引流淋巴样部位,具有抗原特异性记忆B细胞,肽类持久复合物和II类主要组织相容性复合物以及CD69的持续表达。因此,蛋白质疫苗接种通过选择高亲和力效应T-FH细胞并在体内建立抗原特异性记忆T-FH细胞的淋巴样储库来促进B细胞免疫。

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