Interleukin-2 enhances CD4+ T cell memory by promoting the generation of IL-7R alpha-expressing cells.

Interleukin-2 enhances CD4+ T cell memory by promoting the generation of IL-7R alpha-expressing cells.
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DOI:
10.1084/jem.20062381
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发表时间:
2007-03-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Abbas AK
Abbas AK
中科院分区:
其他
文献类型:
--
作者:
Dooms H;Wolslegel K;Lin P;Abbas AK

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常见的γ链细胞因子IL-2和IL-7是T细胞稳态的重要调节因子。虽然IL-2与T细胞反应的急性期有关,但IL-7对记忆T细胞的存活很重要。我们询问对这些生长因子的调节反应性是否由细胞因子特异性的IL-2受体(R)α和IL-7Rα链的瞬时表达决定。我们证明,IL-2Rα在T细胞受体转基因的CD_4+T细胞中早期表达,而IL-7Rα表达缺失。在反应的后期,IL-7Rα重新表达,而IL-2Rα表达沉默。当α+T细胞在没有IL-2信号的情况下被激活时,这种IL-2Rα/IL-7R CD8的表达模式会受到干扰。经IL-2−/−或CD25−/−(IL-2Rα−/−)诱导的CD_4+T细胞,尽管表现出正常的激活标记诱导和细胞分裂,但在反应后期未能重新表达IL-7Rα。由于CD_4+记忆T细胞的产生依赖于IL-7-IL-7Rα的相互作用,经IL-2−/−或CD_(25)−/−诱导的CD_4~+T细胞不能发育为长寿命记忆细胞。逆转录病毒介导的IL-7Rα在IL-2−/−T细胞中的表达可恢复其长期存活的能力。这些结果证实IL-2是一个调节IL-7Rα表达的因子,从而调节体内记忆T细胞的动态平衡。
The common γ chain cytokines interleukin (IL)-2 and IL-7 are important regulators of T cell homeostasis. Although IL-2 is implicated in the acute phase of the T cell response, IL-7 is important for memory T cell survival. We asked whether regulated responsiveness to these growth factors is determined by temporal expression of the cytokine-specific IL-2 receptor (R) α and IL-7Rα chains. We demonstrate that IL-2Rα is expressed early after priming in T cell receptor–transgenic CD4+ T cells, whereas IL-7Rα expression is lost. In the later stage of the response, IL-7Rα is reexpressed while IL-2Rα expression is silenced. This reciprocal pattern of IL-2Rα/IL-7Rα expression is disturbed when CD4+ T cells are primed in the absence of IL-2 signals. Primed IL-2−/− or CD25−/− (IL-2Rα−/−) CD4+ T cells, despite showing normal induction of activation markers and cell division, fail to reexpress IL-7Rα late in the response. Because the generation of CD4+ memory T cells is dependent on IL-7–IL-7Rα interactions, primed IL-2−/− or CD25−/− CD4+ T cells develop poorly into long-lived memory cells. Retrovirus-mediated expression of IL-7Rα in IL-2−/− T cells restores their capacity for long-term survival. These results identify IL-2 as a factor regulating IL-7Rα expression and, consequently, memory T cell homeostasis in vivo.
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