A central role for mTOR kinase in homeostatic proliferation induced CD8+ T cell memory and tumor immunity.

A central role for mTOR kinase in homeostatic proliferation induced CD8+ T cell memory and tumor immunity.
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DOI:
10.1016/j.immuni.2011.04.006
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发表时间:
2011-04-22
期刊:
影响因子:
32.4
通讯作者:
Shrikant PA
Shrikant PA
中科院分区:
医学1区
文献类型:
--
作者:
Li Q;Rao RR;Araki K;Pollizzi K;Odunsi K;Powell JD;Shrikant PA

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引导naïve CD8+ T细胞通过稳态增殖(Homeostatic Proliferation, HP)进行克隆扩增和记忆生成的细胞内在机制尚不清楚。在这里,我们已经证明naïve CD8+ T细胞的HP需要IL-7,而不是IL-15诱导的mTOR激酶激活。hp诱导的mTOR增强转录因子T-bet的功能成熟和CD122的表达,通过支持转录因子Eomesodermin而不是T-bet,从而使IL-15依赖的记忆转变变得敏感。抑制mTOR阻断T-bet和CD122的表达,但通过促进Eomesodermin表达以不依赖il -15的方式保留记忆。雷帕霉素增强hp诱导记忆的能力是细胞固有的,因为在CD8+ T细胞中沉默mTOR产生相同的结果。引人注目的是,由IL-15依赖或独立机制产生的hp诱导的CD8+ T细胞记忆显示出相同的肿瘤功效。这些结果表明mTOR在hp诱导的CD8+ T细胞反应中起着核心作用,并证明了CD8+记忆在hp诱导的肿瘤疗效中的重要性。
The cell-intrinsic mechanisms guiding naïve CD8+ T cells for clonal expansion and memory generation via Homeostatic Proliferation (HP) are unclear. Herein, we have shown that HP of naïve CD8+ T cells requires IL-7, but not IL-15 induced mTOR kinase activation. HP-induced mTOR enhances transcription factor T-bet for functional maturation and CD122 expression, which sensitizes for an IL-15 dependent memory transition by favoring transcription factor Eomesodermin over T-bet. Inhibition of mTOR blocks T-bet and CD122 expression but preserves memory in an IL-15-independent manner by promoting Eomesodermin expression. The ability of rapamycin to augment HP-induced memory was cell-intrinsic as silencing mTOR in CD8+ T cells generated identical outcomes. Strikingly, HP-induced CD8+ T cell memory generated by IL-15 dependent or independent mechanisms demonstrated identical tumor efficacy. These results indicate a central role for mTOR in HP-induced CD8+ T cell responses and demonstrate the importance for CD8+ memory in HP-induced tumor efficacy.
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