Interleukin 15 is required for proliferative renewal of virus-specific memory CD8 T cells.

Interleukin 15 is required for proliferative renewal of virus-specific memory CD8 T cells.
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DOI:
10.1084/jem.20020369
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发表时间:
2002-06-17
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Ahmed R
Ahmed R
中科院分区:
其他
文献类型:
--
作者:
Becker TC;Wherry EJ;Boone D;Murali-Krishna K;Antia R;Ma A;Ahmed R

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抗原特异性记忆T细胞的产生和有效维持对于持久的免疫保护至关重要。在这项研究中,我们利用IL-15或IL-15受体α链缺陷的小鼠,研究了IL-15在病毒特异性记忆CD8T细胞的产生和维持中的作用。细胞因子和受体缺陷小鼠对淋巴细胞性脉络膜脑膜炎病毒(LCMV)的感染产生了强大的原代CD8 T细胞反应,有效地清除了病毒,并产生了与IL-15+/+小鼠中存在的记忆CD8 T细胞表型和功能相似的抗原特异性记忆性CD8 T细胞池。然而,纵向分析显示,在没有IL-15信号的情况下,病毒特异性记忆CD8T细胞的缓慢损耗。这种CD8T细胞的丧失是由于IL-15−/−小鼠抗原特异性记忆CD8T细胞的增殖更新严重缺陷。综上所述,这些结果表明,IL-15对记忆性CD8 T细胞的产生并不是必需的,但对于维持长时间内记忆细胞的数量的平衡增殖是必需的。
The generation and efficient maintenance of antigen-specific memory T cells is essential for long-lasting immunological protection. In this study, we examined the role of interleukin (IL)-15 in the generation and maintenance of virus-specific memory CD8 T cells using mice deficient in either IL-15 or the IL-15 receptor α chain. Both cytokine- and receptor-deficient mice made potent primary CD8 T cell responses to infection with lymphocytic choriomeningitis virus (LCMV), effectively cleared the virus and generated a pool of antigen-specific memory CD8 T cells that were phenotypically and functionally similar to memory CD8 T cells present in IL-15+/+ mice. However, longitudinal analysis revealed a slow attrition of virus-specific memory CD8 T cells in the absence of IL-15 signals.This loss of CD8 T cells was due to a severe defect in the proliferative renewal of antigen-specific memory CD8 T cells in IL-15−/− mice. Taken together, these results show that IL-15 is not essential for the generation of memory CD8 T cells, but is required for homeostatic proliferation to maintain populations of memory cells over long periods of time.
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