Antiviral CD4+ memory T cells are IL-15 dependent.

Antiviral CD4+ memory T cells are IL-15 dependent.
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DOI:
10.1084/jem.20061805
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发表时间:
2007-04-16
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Surh CD
Surh CD
中科院分区:
其他
文献类型:
--
作者:
Purton JF;Tan JT;Rubinstein MP;Kim DM;Sprent J;Surh CD

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记忆性CD 4+和CD 8 + T细胞的存活和间歇性增殖似乎受不同的稳态机制控制。特别是,与白细胞介素(IL)-15接触对记忆性CD 8+细胞有决定性影响,但对记忆性CD 4+细胞没有影响。过去对记忆CD 4+细胞的研究严重依赖于使用天然存在的记忆表型(MP)细胞作为抗原(Ag)特异性记忆细胞的替代物。然而,我们在这里显示,MP CD 4+细胞包含一个突出的子集的快速增殖的主要组织相容性复合体(MHC)II依赖性细胞。相比之下,Ag特异性记忆CD 4细胞具有缓慢的周转率,并且不依赖于MHC II。在辐射宿主中,这些后者细胞忽略IL-15并响应于淋巴细胞减少宿主中IL-7水平升高而扩增。相反,在IL-7水平低的正常非淋巴细胞减少宿主中,记忆性CD 4细胞严重依赖于IL-15。值得注意的是,记忆性CD 4+对内源性IL-15的反应反映了来自其他细胞,特别是CD 8+和自然杀伤细胞的显著竞争,并且在去除这些细胞后显著增加。因此,在正常生理条件下,CD 8+和CD 4+记忆细胞的稳态非常相似,并且涉及IL-15和IL-7。
Survival and intermittent proliferation of memory CD4+ and CD8+ T cells appear to be controlled by different homeostatic mechanisms. In particular, contact with interleukin (IL)-15 has a decisive influence on memory CD8+ cells, but not memory CD4+ cells. Past studies of memory CD4+ cells have relied heavily on the use of naturally occurring memory phenotype (MP) cells as a surrogate for antigen (Ag)-specific memory cells. However, we show here that MP CD4+ cells contain a prominent subset of rapidly proliferating major histocompatibility complex (MHC) II–dependent cells. In contrast, Ag-specific memory CD4 cells have a slow turnover rate and are MHC II independent. In irradiated hosts, these latter cells ignore IL-15 and expand in response to the elevated levels of IL-7 in the lymphopenic hosts. In contrast, in normal nonlymphopenic hosts where IL-7 levels are low, memory CD4 cells are heavily dependent on IL-15. Significantly, memory CD4+ responsiveness to endogenous IL-15 reflects marked competition from other cells, especially CD8+ and natural killer cells, and increases considerably after removal of these cells. Therefore, under normal physiological conditions, homeostasis of CD8+ and CD4+ memory cells is quite similar and involves IL-15 and IL-7.
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