Intrinsic antiproliferative activity of the innate sensor STING in T lymphocytes

J Exp Med. 2017 Jun 5;214(6):1769-1785. doi: 10.1084/jem.20161674. Epub 2017 May 8.

Abstract

Activation of the cyclic dinucleotide sensor stimulator of interferon (IFN) genes (STING) is critical for IFN and inflammatory gene expression during innate immune responses. However, the role of STING in adaptive immunity is still unknown. In this study, we show that STING activation reduces the proliferation of T lymphocytes. This activity was independent of TBK1 and IRF3 recruitment and of type I IFN but required a distinct C-terminal domain of STING that activates NF-κB. Inhibition of cell proliferation by STING required its relocalization to the Golgi apparatus and caused mitotic errors. T lymphocytes from patients carrying constitutive active mutations in TMEM173 encoding STING showed impaired proliferation and reduced numbers of memory cells. Endogenous STING inhibited proliferation of mouse T lymphocytes. Therefore, STING, a critical innate sensor, also functions intrinsically in cells of the adaptive immune system to inhibit proliferation.

MeSH terms

  • Binding Sites
  • Cell Proliferation
  • Dendritic Cells / metabolism
  • Humans
  • Immunity, Innate*
  • Interferon Regulatory Factor-3 / metabolism
  • Membrane Proteins / chemistry
  • Membrane Proteins / metabolism*
  • Mitosis
  • Mutant Proteins / metabolism
  • Protein Domains
  • Protein-Serine-Threonine Kinases / metabolism
  • Signal Transduction
  • T-Lymphocytes / cytology*
  • T-Lymphocytes / metabolism*

Substances

  • IRF3 protein, human
  • Interferon Regulatory Factor-3
  • Membrane Proteins
  • Mutant Proteins
  • STING protein, human
  • Protein-Serine-Threonine Kinases
  • TBK1 protein, human