Journal
NATURE IMMUNOLOGY
Volume 17, Issue 5, Pages 556-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/ni.3390
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Funding
- US National Institutes of Health [R01 AI068787]
- Arthritis Foundation
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Homeostasis of the immune system depends on the proper function of regulatory T cells (T-reg cells). Compromised suppressive activity of T-reg cells leads to autoimmune disease and graft rejection and promotes anti-tumor immunity. Here we report a previously unrecognized requirement for the serine-threonine phosphatase PP2A in the function of T-reg cells. T-reg cells exhibited high PP2A activity, and T-reg cell-specific ablation of the PP2A complex resulted in a severe, multi-organ, lymphoproliferative autoimmune disorder. Mass spectrometry revealed that PP2A associated with components of the mTOR metabolic-checkpoint kinase pathway and suppressed the activity of the mTORC1 complex. In the absence of PP2A, T-reg cells altered their metabolic and cytokine profile and were unable to suppress effector immune responses. Therefore, PP2A is required for the function of T-reg cells and the prevention of autoimmunity.
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