Intraclonal competition inhibits the formation of high-affinity antibody-secreting cells.

Intraclonal competition inhibits the formation of high-affinity antibody-secreting cells.
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DOI:
10.4049/jimmunol.181.9.6027
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发表时间:
2008-11-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Chaplin DD
Chaplin DD
中科院分区:
其他
文献类型:
--
作者:
Le TV;Kim TH;Chaplin DD

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保护性免疫需要一个多样化的多克隆B细胞谱系。我们证明,当识别半抗原的预先存在的克隆性限制性细胞在B细胞谱系中占主导地位时,体液对半抗原的亲和力成熟受到损害。B1-8I+/−小鼠具有高频率的具有硝基苯基(NP)结合特异性的B细胞,通过产生NP特异性抗体来应答NP半抗原蛋白,但由于不足以产生高亲和力抗体产生细胞,亲和力成熟受到损害。我们通过将B1-8B细胞过继转移到幼稚的野生型受体中来操纵NP特异性B细胞的频率。值得注意的是,当104个B1-8 B细胞被转移时,这些细胞支持有效的亲和成熟和浆细胞分化。相反,当106个B1-8细胞被转移时,没有发生亲和力成熟。这些数据表明,为了支持亲和力成熟,需要限制克隆性相关B细胞的频率。
Protective immunity requires a diverse, polyclonal B cell repertoire. We demonstrate that affinity maturation of the humoral response to a hapten is impaired when pre-existing clonally restricted cells recognizing the hapten are dominant in the B cell repertoire. B1- 8i+/− mice, which feature a high frequency of B cells with nitrophenyl (NP) binding specificity, respond to NP-haptenated proteins with the production of NP-specific antibodies, but affinity maturation is impaired due to insufficient generation of high affinity antibody producing cells. We manipulated the frequency of NP-specific B cells by adoptive transfer of B1-8 B cells into naïve, wild-type recipients. Remarkably, when 104 B1-8 B cells were transferred, these cells supported efficient affinity maturation and plasma cell differentiation. In contrast, when 106 B1-8 cells were transferred, affinity maturation did not occur. These data indicate that restricting the frequency of clonally related B cells is required to support affinity maturation.
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