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
中科院分区:
文献类型:
--
作者:
Li Q;Rao RR;Araki K;Pollizzi K;Odunsi K;Powell JD;Shrikant PA
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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