alexa The mTOR kinase differentially regulates effector and regulatory T cell lineage commitment.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Delgoffe GM, Kole TP, Zheng Y, Zarek PE, Matthews KL,

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Abstract Effector T cell differentiation requires the simultaneous integration of multiple, and sometimes opposing, cytokine signals. We demonstrated mTOR's role in dictating the outcome of T cell fate. mTOR-deficient T cells displayed normal activation and IL-2 production upon initial stimulation. However, such cells failed to differentiate into T helper 1 (Th1), Th2, or Th17 effector cells. The inability to differentiate was associated with decreased STAT transcription factor activation and failure to upregulate lineage-specific transcription factors. Under normally activating conditions, T cells lacking mTOR differentiated into Foxp3(+) regulatory T cells. This was associated with hyperactive Smad3 activation in the absence of exogenous TGF-beta. Surprisingly, T cells selectively deficient in TORC1 do not divert to a regulatory T cell pathway, implicating both TORC1 and TORC2 in preventing the generation of regulatory T cells. Overall, our studies suggest that mTOR kinase signaling regulates decisions between effector and regulatory T cell lineage commitment.
This article was published in Immunity and referenced in Journal of Clinical & Cellular Immunology

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