MALT1 protease function in regulatory T cells induces MYC activity to promote mitochondrial function and cellular expansion.

Regulatory T cells (Tregs) are essential for the inhibition of immunity and the maintenance of tissue homeostasis. Signals from the T-cell antigen receptor (TCR) are critical for early Treg development, their expansion, and inhibitory activity. Although TCR-engaged activation of the paracaspase MALT1 is important for these Treg activities, the MALT1 effector pathways in Tregs remain ill-defined. Here, we demonstrate that MALT1 protease activity controls the TCR-induced upregulation of the transcription factor MYC and the subsequent expression of MYC target genes in Tregs. These mechanisms are important for Treg-intrinsic mitochondrial function, optimal respiratory capacity, and homeostatic Treg proliferation. Consistently, conditional deletion of Myc in Tregs results similar to MALT1 inactivation in a lethal autoimmune inflammatory syndrome. Together, these results identify a MALT1 protease-mediated link between TCR signaling in Tregs and MYC control that coordinates metabolism and Treg expansion for the maintenance of immune homeostasis. © 2021 The Authors. European Journal of Immunology published by Wiley-VCH GmbH.

Citation

Marc Rosenbaum, Theresa Schnalzger, Thomas Engleitner, Christin Weiß, Ritu Mishra, Cora Mibus, Theresa Mitterer, Roland Rad, Jürgen Ruland. MALT1 protease function in regulatory T cells induces MYC activity to promote mitochondrial function and cellular expansion. European journal of immunology. 2022 Jan;52(1):85-95

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PMID: 34668583

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