CD4+ T helper cells use CD154-CD40 interactions to counteract T reg cell-mediated suppression of CD8+ T cell responses to influenza.

CD4+ T helper cells use CD154-CD40 interactions to counteract T reg cell-mediated suppression of CD8+ T cell responses to influenza.
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DOI:
10.1084/jem.20130097
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发表时间:
2013-07-29
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Randall TD
Randall TD
中科院分区:
其他
文献类型:
--
作者:
Ballesteros-Tato A;León B;Lund FE;Randall TD

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CD 40 + DC与CD 154 + CD 4 + T细胞相互作用,以消除T reg细胞介导的对流感特异性CD 8 + T细胞的抑制。CD 4 + T细胞通过CD 40-CD 154相互作用许可树突状细胞(DC)来促进CD 8 + T细胞引发。然而,CD 40信号传导的初始需求可能被病原体来源的信号直接激活DC所取代。然而,CD 40-CD 154相互作用通常是最佳的CD 8 + T细胞对病原体的反应所必需的,原因不明。在这里,我们表明,CD 40信号传导是防止流感特异性CD 8 + T细胞反应过早收缩所必需的。DC需要CD 40,但B细胞或T细胞不需要,而CD 4 + T细胞需要CD 154,但CD 8 + T细胞、NKT细胞或DC不需要。巧合的是,即使表达CD 154的CD 4 + T细胞是稳健的CD 8 + T细胞应答所需的,但在不存在CD 4 + T细胞的情况下,初级CD 8 + T细胞应答显然是正常的。我们解决了这个矛盾,表明CD 40-轴承DC与CD 154-表达的CD 4 + T细胞的相互作用,排除了调节性T细胞(T reg细胞)介导的抑制,并防止流感特异性CD 8 + T细胞反应的过早收缩。因此,当T reg细胞不存在时,CD 4 + T辅助细胞对于针对流感的稳健的CD 8 + T细胞应答是不需要的。
CD40+ DCs interact with CD154+CD4+ T cells to abrogate T reg cell–mediated suppression of influenza-specific CD8+ T cells. CD4+ T cells promote CD8+ T cell priming by licensing dendritic cells (DCs) via CD40–CD154 interactions. However, the initial requirement for CD40 signaling may be replaced by the direct activation of DCs by pathogen-derived signals. Nevertheless, CD40–CD154 interactions are often required for optimal CD8+ T cell responses to pathogens for unknown reasons. Here we show that CD40 signaling is required to prevent the premature contraction of the influenza-specific CD8+ T cell response. CD40 is required on DCs but not on B cells or T cells, whereas CD154 is required on CD4+ T cells but not CD8+ T cells, NKT cells, or DCs. Paradoxically, even though CD154-expressing CD4+ T cells are required for robust CD8+ T cell responses, primary CD8+ T cell responses are apparently normal in the absence of CD4+ T cells. We resolved this paradox by showing that the interaction of CD40-bearing DCs with CD154-expressing CD4+ T cells precludes regulatory T cell (T reg cell)–mediated suppression and prevents premature contraction of the influenza-specific CD8+ T cell response. Thus, CD4+ T helper cells are not required for robust CD8+ T cell responses to influenza when T reg cells are absent.
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