Autocrine vitamin D signaling switches off pro-inflammatory programs of TH1 cells

Nat Immunol. 2022 Jan;23(1):62-74. doi: 10.1038/s41590-021-01080-3. Epub 2021 Nov 11.

Abstract

The molecular mechanisms governing orderly shutdown and retraction of CD4+ type 1 helper T (TH1) cell responses remain poorly understood. Here we show that complement triggers contraction of TH1 responses by inducing intrinsic expression of the vitamin D (VitD) receptor and the VitD-activating enzyme CYP27B1, permitting T cells to both activate and respond to VitD. VitD then initiated the transition from pro-inflammatory interferon-γ+ TH1 cells to suppressive interleukin-10+ cells. This process was primed by dynamic changes in the epigenetic landscape of CD4+ T cells, generating super-enhancers and recruiting several transcription factors, notably c-JUN, STAT3 and BACH2, which together with VitD receptor shaped the transcriptional response to VitD. Accordingly, VitD did not induce interleukin-10 expression in cells with dysfunctional BACH2 or STAT3. Bronchoalveolar lavage fluid CD4+ T cells of patients with COVID-19 were TH1-skewed and showed de-repression of genes downregulated by VitD, from either lack of substrate (VitD deficiency) and/or abnormal regulation of this system.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • 25-Hydroxyvitamin D3 1-alpha-Hydroxylase / metabolism
  • Basic-Leucine Zipper Transcription Factors / metabolism
  • Bronchoalveolar Lavage Fluid / cytology
  • COVID-19 / immunology
  • COVID-19 / pathology
  • Complement C3a / immunology
  • Complement C3b / immunology
  • Humans
  • Interferon-gamma / immunology*
  • Interleukin-10 / immunology*
  • JNK Mitogen-Activated Protein Kinases / metabolism
  • Lymphocyte Activation / immunology
  • Receptors, Calcitriol / metabolism
  • Respiratory Distress Syndrome / immunology
  • Respiratory Distress Syndrome / pathology
  • Respiratory Distress Syndrome / virology
  • SARS-CoV-2 / immunology*
  • STAT3 Transcription Factor / metabolism
  • Signal Transduction / immunology
  • Th1 Cells / immunology*
  • Transcription, Genetic / genetics
  • Vitamin D / metabolism*

Substances

  • BACH2 protein, human
  • Basic-Leucine Zipper Transcription Factors
  • IFNG protein, human
  • IL10 protein, human
  • Receptors, Calcitriol
  • STAT3 Transcription Factor
  • STAT3 protein, human
  • VDR protein, human
  • Interleukin-10
  • Vitamin D
  • Complement C3a
  • Complement C3b
  • Interferon-gamma
  • 25-Hydroxyvitamin D3 1-alpha-Hydroxylase
  • CYP27B1 protein, human
  • JNK Mitogen-Activated Protein Kinases

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