CD40 regulates human dendritic cell-derived IL-7 production that, in turn, contributes to CD8(+) T-cell antigen-specific expansion.

CD40 regulates human dendritic cell-derived IL-7 production that, in turn, contributes to CD8(+) T-cell antigen-specific expansion.
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DOI:
10.1038/icb.2008.80
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发表时间:
2009-02
影响因子:
4
通讯作者:
Linette, Gerald P.
Linette, Gerald P.
中科院分区:
医学3区
文献类型:
--
作者:
Carreno, Beatriz M.;Becker-Hapak, Michelle;Linette, Gerald P.

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在活化的CD 4 + T细胞上表达的CD 40 L(CD 154)已显示提供CD 40+树突状细胞(DC),这是建立CD 8 + T细胞免疫的关键信号。CD 40 L-CD 40相互作用导致DC成熟,产生IL-12和上调各种共刺激分子。在这项研究中,我们表明,CD 40的参与提供了一个独特的成熟信号,人类单核细胞衍生的DC上调IL-7的生产。其他DC成熟诱导剂,如TLR 4和TLR 7/8激动剂,不能诱导IL-7上调。用CMV pp 65-NLV肽脉冲的成熟DC(mDC)刺激的人CD 8 + T细胞培养物中IL-7活性的中和导致抗原特异性CD 8 + T细胞产量的降低,表明mDC衍生的IL-7在T细胞受体(TCR)活化期间的作用。此外,IL-7信号传导需要与TCR活化的时间协调以获得最大的抗原特异性T细胞产量。这些结果表明,CD 40信号调节DC衍生的IL-7产生,这反过来可以在TCR接合时指导CD 8 + T细胞存活,导致抗原特异性T细胞的扩增增加。
CD40L (CD154) expressed on activated CD4+ T cells has been shown to provide CD40+ dendritic cells (DCs), a critical signal for establishing CD8+ T-cell immunity. CD40L–CD40 interaction leads to DC maturation with IL-12 production and upregulation of various costimulatory molecules. In this study, we show that CD40 engagement provides a unique maturation signal for human monocyte-derived DCs to upregulate IL-7 production. Other inducers of DC maturation, such as TLR 4 and TLR 7/8 agonist, fail to induce IL-7 upregulation. Neutralization of IL-7 activity in human CD8+ T-cell cultures stimulated with CMV pp65-NLV peptide-pulsed mature DCs (mDCs) leads to a reduction in antigen-specific CD8+ T-cell yields suggesting a role for mDC-derived IL-7 during T-cell receptor (TCR) activation. Furthermore, IL-7 signaling requires a temporal coordination with TCR activation for maximal antigen-specific T-cell yields. These results show that CD40 signals regulate DC-derived IL-7 production that, in turn, may instruct CD8+ T cells at the time of TCR engagement for survival leading to an increased expansion of antigen-specific T cells.
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