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.
中科院分区:
文献类型:
--
作者:
Carreno, Beatriz M.;Becker-Hapak, Michelle;Linette, Gerald P.
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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