Journal
NATURE IMMUNOLOGY
Volume 12, Issue 9, Pages 888-U11Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ni.2068
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Funding
- US National Institutes of Health [K01 AR053573, R01 NS064599]
- Arthritis Foundation
- Lupus Research Institute
- American Lebanese Syrian Associated Charities
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The mechanisms that regulate T cell quiescence are poorly understood. We report that the tumor suppressor Tsc1 established a quiescence program in naive T cells by controlling cell size, cell cycle entry and responses to stimulation of the T cell antigen receptor. Abrogation of quiescence predisposed Tsc1-deficient T cells to apoptosis that resulted in loss of conventional T cells and invariant natural killer T cells. Loss of Tsc1 function dampened in vivo immune responses to bacterial infection. Tsc1-deficient T cells had more activity of the serine-threonine kinase complex mTORC1 but less mTORC2 activity, and activation of mTORC1 was essential for the disruption of immune homeostasis. Therefore, Tsc1-dependent control of mTOR is crucial in actively maintaining the quiescence of naive T cells to facilitate adaptive immune function.
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