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首页> 外文期刊>Nature immunology >Role of antigen receptor affinity in T cell-independent antibody responses in vivo
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Role of antigen receptor affinity in T cell-independent antibody responses in vivo

机译:抗原受体亲和力在体内独立于T细胞的抗体反应中的作用

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To examine how B cell receptor affinity affects clonal section in thymus-independent type 2 (TI-2) immune responses, we produced mice with antibodies that showed a 40-fold difference in affinity for the hapten (4-hydroxy-3-nitrophenyl)acetyl (NP). The difference in the responses of high- and low-affinity B cells to NP-Ficoll was only twofold. However, in competition experiments only the high-affinity B cells responded to antigen. CD19 deficiency increased the affinity threshold of TI-2 responses, whereas Lyn deficiency enhanced clonal expansion but abrogated B cell terminal differentiation. Thus, in TI-2 immune responses, large differences in affinity produce only small differences in the intrinsic ability of B cells to respond to antigen, and selection for high-affinity clones is due to clonal competition during the earliest stages of the response.
机译:为了检查B细胞受体的亲和力如何影响不依赖胸腺的2型(TI-2)免疫应答中的克隆切片,我们生产的小鼠抗体对半抗原(4-​​羟基-3-硝基苯基)的亲和力显示出40倍的差异乙酰(NP)。高亲和力和低亲和力B细胞对NP-Ficoll反应的差异只有两倍。但是,在竞争实验中,只有高亲和力的B细胞对抗原有反应。 CD19缺乏症增加了TI-2应答的亲和力阈值,而Lyn缺乏症则增强了克隆扩增但废除了B细胞末端分化。因此,在TI-2免疫应答中,亲和力的大差异只会使B细胞对抗原的内在能力产生很小的差异,而对高亲和力克隆的选择归因于响应的最早阶段。

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