The cytokines IL-21 and GM-CSF have opposing regulatory roles in the apoptosis of conventional dendritic cells.

The cytokines IL-21 and GM-CSF have opposing regulatory roles in the apoptosis of conventional dendritic cells.
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细胞因子IL-21和GM-CSF在常规树突状细胞的凋亡中具有相反的调节作用。

DOI:
10.1016/j.immuni.2013.02.011
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发表时间:
2013-03-21
期刊:
影响因子:
32.4
通讯作者:
Leonard WJ
Leonard WJ
中科院分区:
医学1区
文献类型:
--
作者:
Wan CK;Oh J;Li P;West EE;Wong EA;Andraski AB;Spolski R;Yu ZX;He J;Kelsall BL;Leonard WJ

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白介素 21 (IL-21) 对 T 细胞和 B 细胞具有广泛的作用,但其在先天免疫中的作用尚不清楚。在这里,我们发现 IL-21 通过 STAT3 和 Bim 诱导传统树突状细胞 (cDC) 凋亡,并且这种凋亡被粒细胞巨噬细胞集落刺激因子 (GM-CSF) 抑制。 ChIP-Seq 分析揭示了 GM-CSF 诱导的 STAT5 和 IL-21 诱导的 STAT3 之间存在全基因组结合竞争。 IL-21 体内表达减少了 cDC 数量,而 GM-CSF 可以阻止这种情况。此外,对小鼠重复注射 α-半乳糖神经酰胺可诱导 IL-21,但减少自然杀伤 T (NKT) 细胞产生 GM-CSF,这与 cDC 数量减少相关。此外,与 Rag2−/− 小鼠相比,野生型 CD4+ T 细胞的过继转移导致 Il21r−/−Rag2−/− 小鼠(缺乏 T 细胞且具有 IL-21 无反应 DC)中 DC 和产生干扰素 (IFN)-γ 的 CD4+ T 细胞增加,导致更严重的结肠炎。因此,IL-21和GM-CSF对基因调节和细胞凋亡表现出交叉调节作用,调节cDC数量,从而调节免疫反应的强度。
Interleukin-21 (IL-21) has broad actions on T- and B-cells, but its actions in innate immunity are poorly understood. Here we show that IL-21 induced apoptosis of conventional dendritic cells (cDCs) via STAT3 and Bim, and this was inhibited by granulocyte-macrophage colony-stimulating factor (GM-CSF). ChIP-Seq analysis revealed genome-wide binding competition between GM-CSF-induced STAT5 and IL-21-induced STAT3. Expression of IL-21 in vivo decreased cDC numbers, and this was prevented by GM-CSF. Moreover, repetitive α-galactosylceramide injection of mice induced IL-21 but decreased GM-CSF production by natural killer T (NKT) cells, correlating with decreased cDC numbers. Furthermore, adoptive-transfer of wild-type CD4+ T cells caused more severe colitis with increased DCs and interferon (IFN)-γ producing CD4+ T cells in Il21r−/−Rag2−/− mice (which lack T cells and have IL-21-unresponsive DCs) than in Rag2−/− mice. Thus, IL-21 and GM-CSF exhibit cross-regulatory actions on gene regulation and apoptosis, regulating cDC numbers and thereby the magnitude of the immune response.
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