Distinct roles for IL-2 and IL-15 in the differentiation and survival of CD8+ effector and memory T cells.

Distinct roles for IL-2 and IL-15 in the differentiation and survival of CD8+ effector and memory T cells.
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DOI:
10.4049/jimmunol.0904089
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发表时间:
2010-06-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Williams MA
Williams MA
中科院分区:
其他
文献类型:
--
作者:
Mitchell DM;Ravkov EV;Williams MA

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白介素 2 (IL-2) 在初级反应期间向 CD8+ T 细胞提供记忆分化信号,影响后续记忆池成功回忆反应的能力。我们发现,虽然在没有 IL-2 的情况下初级效应 CTL 的发育会适度减少,但病原体清除后短期和长期效应记忆 CD8+ T 细胞的持久性会大大减弱。此外,缺乏高亲和力 IL-2 受体的 CD8+ 记忆 T 细胞的二次攻击会导致效应池无法重新填充。 IL-2 在促进效应细胞分化方面的作用与高度相关的细胞因子 IL-15 不同。虽然 IL-15 支持效应 CD8+ T 细胞在病原体清除后存活,但它的缺失不会损害初级或次级效应 CTL 分化,也不会影响长期效应记忆 CD8+ T 细胞的分化。这些发现表明,IL-2(而非 IL-15)不仅在促进初级效应 CD8+ T 细胞的分化中,而且在能够促进次级效应分化的 CD8+ 记忆 T 细胞的分化中发挥着独特的作用。
Interleukin-2 (IL-2) provides a memory differentiation signal to CD8+ T cells during the primary response that impacts the ability of the subsequent memory pool to mount a successful recall response. We find here that while primary effector CTL development is modestly decreased in the absence of IL-2, the persistence of short-term and long-term effector memory CD8+ T cells upon pathogen clearance is greatly diminished. Furthermore, secondary challenge of CD8+ memory T cells lacking the high avidity IL-2 receptor results in a failure to repopulate the effector pool. The role of IL-2 in promoting effector differentiation is not shared with the highly related cytokine, IL-15. While IL-15 supports the survival of effector CD8+ T cells following pathogen clearance, its absence does not impair either primary or secondary effector CTL differentiation, nor does it impact the differentiation of long-term effector memory CD8+ T cells. These findings indicate a unique role for IL-2, but not IL-15, in promoting the differentiation not only of primary effector CD8+ T cells but also of CD8+ memory T cells capable of secondary effector differentiation.
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