The TNF Receptor Superfamily-NF-κB Axis Is Critical to Maintain Effector Regulatory T Cells in Lymphoid and Non-lymphoid Tissues

Cell Rep. 2017 Sep 19;20(12):2906-2920. doi: 10.1016/j.celrep.2017.08.068. Epub 2017 Sep 7.

Abstract

After exiting the thymus, Foxp3+ regulatory T (Treg) cells undergo further differentiation in the periphery, resulting in the generation of mature, fully suppressive effector (e)Treg cells in a process dependent on TCR signaling and the transcription factor IRF4. Here, we show that tumor necrosis factor receptor superfamily (TNFRSF) signaling plays a crucial role in the development and maintenance of eTreg cells. TNFRSF signaling activated the NF-κB transcription factor RelA, which was required to maintain eTreg cells in lymphoid and non-lymphoid tissues, including RORγt+ Treg cells in the small intestine. In response to TNFRSF signaling, RelA regulated basic cellular processes, including cell survival and proliferation, but was dispensable for IRF4 expression or DNA binding, indicating that both pathways operated independently. Importantly, mutations in the RelA binding partner NF-κB1 compromised eTreg cells in humans, suggesting that the TNFRSF-NF-κB axis was required in a non-redundant manner to maintain eTreg cells in mice and humans.

Keywords: IRF4; NF-κB/RelA; RORγt(+) Treg cells; TCR; TNFRSF signaling; effector Treg cells; tissue Treg cells.

MeSH terms

  • Animals
  • Cell Differentiation
  • Cell Survival
  • Homeostasis
  • Humans
  • Interferon Regulatory Factors / metabolism
  • Intestines / cytology
  • Lymphoid Tissue / metabolism*
  • Mice
  • NF-kappa B / metabolism*
  • Nuclear Receptor Subfamily 1, Group F, Member 3 / metabolism
  • Receptors, Tumor Necrosis Factor / metabolism*
  • Signal Transduction*
  • T-Lymphocytes, Regulatory / metabolism*
  • Transcription Factor RelA / metabolism

Substances

  • Interferon Regulatory Factors
  • NF-kappa B
  • Nuclear Receptor Subfamily 1, Group F, Member 3
  • Receptors, Tumor Necrosis Factor
  • Transcription Factor RelA
  • interferon regulatory factor-4