Abstract
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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Acknowledgements
We thank P. Ohashi (University of Toronto) for Akt1-transgenic mice; T. Ludwig (Columbia University) for Rosa26-Cre-ERT2 mice; R. Cross, G. Lennon and S. Morgan for cell sorting; and the National Institutes of Health Tetramer Facility for the CD1d-PBS57 tetramer. Supported by the US National Institutes of Health (K01 AR053573 and R01 NS064599), the Arthritis Foundation, the Lupus Research Institute and the American Lebanese Syrian Associated Charities (H.C.).
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K.Y. designed and did cellular, molecular and biochemical experiments and contributed to the writing of the manuscript; G.N. did bioinformatic analyses; D.R.G. contributed genetic models and conceptual insights; W.H. contributed to cell purification; and H.C. designed experiments, wrote the manuscript and provided overall direction.
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Yang, K., Neale, G., Green, D. et al. The tumor suppressor Tsc1 enforces quiescence of naive T cells to promote immune homeostasis and function. Nat Immunol 12, 888–897 (2011). https://doi.org/10.1038/ni.2068
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DOI: https://doi.org/10.1038/ni.2068