Negative selection during the peripheral immune response to antigen.

Negative selection during the peripheral immune response to antigen.
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DOI:
10.1084/jem.193.1.1
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发表时间:
2001-01-01
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Wraith DC
Wraith DC
中科院分区:
其他
文献类型:
--
作者:
Anderton SM;Radu CG;Lowrey PA;Ward ES;Wraith DC

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胸腺选择取决于基于 T 细胞与抗原-主要组织相容性复合物相互作用的亲和力的正向和负向选择机制。然而,响应 T 细胞库的招募和克隆扩增的外围机制仍然不清楚。在这里,我们为响应抗原挑战的外周 T 细胞克隆扩增的基于亲合力的模型提供了证据。我们使用来自髓磷脂碱性蛋白的致脑炎、H-2 Au 限制性乙酰化 NH2 末端九聚肽 (Ac1-9) 表位作为我们的模型抗原。基于其与 Au 的结合亲和力的差异,产生了不同抗原强度(通过体外测定评估)的肽类似物。在体内,这些类似物引发了不同的 T 细胞库,在抗原敏感性方面表现出显着差异。用最弱的(野生型)抗原进行免疫可以扩增诱导脑脊髓炎所需的高亲和力 T 细胞。相比之下,使用强抗原类似物进行免疫会导致携带高亲和力T细胞受体的T细胞通过凋亡被消除,从而预防疾病的发展。此外,T 细胞库不断调整,以相同的激活阈值对免疫抗原做出反应。这种调节机制提供了针对自身反应性 T 细胞扩增的外周控制,并对免疫治疗和疫苗设计具有影响。
Thymic selection depends on positive and negative selective mechanisms based on the avidity of T cell interaction with antigen–major histocompatibility complex complexes. However, peripheral mechanisms for the recruitment and clonal expansion of the responding T cell repertoire remain obscure. Here we provide evidence for an avidity-based model of peripheral T cell clonal expansion in response to antigenic challenge. We have used the encephalitogenic, H-2 Au-restricted, acetylated NH2-terminal nonameric peptide (Ac1-9) epitope from myelin basic protein as our model antigen. Peptide analogues were generated that varied in antigenic strength (as assessed by in vitro assay) based on differences in their binding affinity for Au. In vivo, these analogues elicited distinct repertoires of T cells that displayed marked differences in antigen sensitivity. Immunization with the weakest (wild-type) antigen expanded the high affinity T cells required to induce encephalomyelitis. In contrast, immunization with strongly antigenic analogues led to the elimination of T cells bearing high affinity T cell receptors by apoptosis, thereby preventing disease development. Moreover, the T cell repertoire was consistently tuned to respond to the immunizing antigen with the same activation threshold. This tuning mechanism provides a peripheral control against the expansion of autoreactive T cells and has implications for immunotherapy and vaccine design.
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影响因子: 64.8
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