A single peptide-major histocompatibility complex ligand triggers digital cytokine secretion in CD4(+) T cells.

A single peptide-major histocompatibility complex ligand triggers digital cytokine secretion in CD4(+) T cells.
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DOI:
10.1016/j.immuni.2013.08.036
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发表时间:
2013-11-14
期刊:
影响因子:
32.4
通讯作者:
Davis MM
Davis MM
中科院分区:
医学1区
文献类型:
--
作者:
Huang J;Brameshuber M;Zeng X;Xie J;Li QJ;Chien YH;Valitutti S;Davis MM

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我们已经开发了一种单分子成像技术,使用量子点标记的肽-主要组织相容性复合物(pMHC)配体来研究CD 4 + T细胞的功能敏感性。我们发现,初始T细胞、T细胞母细胞和记忆T细胞都可以被单个pMHC触发,分别以约1,000、约10,000和约10,000分子/min的速率分泌肿瘤坏死因子-α(TNF-α)和白细胞介素-2(IL-2)细胞因子,并且额外的pMHC不会增加分泌,表明数字反应模式。我们还发现,一个单一的pMHC定位于免疫突触诱导缓慢形成一个持久的T细胞受体(TCR)簇,符合一系列的参与机制。这些数据表明,按比例增加CD 4 + T细胞细胞因子应答涉及越来越有效的T细胞募集,而不是每个细胞产生更多的细胞因子。
We have developed a single-molecule imaging technique that uses quantum dot-labeled peptide-major histocompatibility complex (pMHC) ligands to study CD4+ T cell functional sensitivity. We found that naive T cells, T cell blasts and memory T cells could all be triggered by a single pMHC to secrete tumor necrosis factor-α (TNF-α) and interleukin-2 (IL-2) cytokines with a rate of ~1,000, ~10,000 and ~10,000 molecules/min respectively and that additional pMHCs did not augment secretion, indicating a digital response pattern. We also found that a single pMHC localized to the immunological synapse induced the slow formation of a long-lasting T cell receptor (TCR) cluster, consistent with a serial engagement mechanism. These data show that scaling up CD4+ T cell cytokine responses involves increasingly efficient T cell recruitment rather than greater cytokine production per cell.
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