The alarmin interleukin-33 promotes the expansion and preserves the stemness of Tcf-1+ CD8+ T cells in chronic viral infection

Immunity. 2023 Apr 11;56(4):813-828.e10. doi: 10.1016/j.immuni.2023.01.029. Epub 2023 Feb 20.

Abstract

T cell factor 1 (Tcf-1) expressing CD8+ T cells exhibit stem-like self-renewing capacity, rendering them key for immune defense against chronic viral infection and cancer. Yet, the signals that promote the formation and maintenance of these stem-like CD8+ T cells (CD8+SL) remain poorly defined. Studying CD8+ T cell differentiation in mice with chronic viral infection, we identified the alarmin interleukin-33 (IL-33) as pivotal for the expansion and stem-like functioning of CD8+SL as well as for virus control. IL-33 receptor (ST2)-deficient CD8+ T cells exhibited biased end differentiation and premature loss of Tcf-1. ST2-deficient CD8+SL responses were restored by blockade of type I interferon signaling, suggesting that IL-33 balances IFN-I effects to control CD8+SL formation in chronic infection. IL-33 signals broadly augmented chromatin accessibility in CD8+SL and determined these cells' re-expansion potential. Our study identifies the IL-33-ST2 axis as an important CD8+SL-promoting pathway in the context of chronic viral infection.

Keywords: CD8(+)SL; IL-33; T cell factor 1; Tcf-1; chronic viral infection; interleukin-33; lymphocytic choriomeningitis virus; stem-like CD8(+) T cells; type I interferon.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alarmins / metabolism
  • Animals
  • CD8-Positive T-Lymphocytes*
  • Interleukin-1 Receptor-Like 1 Protein / metabolism
  • Interleukin-33* / metabolism
  • Lymphocytic Choriomeningitis* / immunology
  • Lymphocytic choriomeningitis virus
  • Mice
  • Mice, Inbred C57BL
  • Persistent Infection
  • T Cell Transcription Factor 1 / metabolism

Substances

  • Alarmins
  • Interleukin-1 Receptor-Like 1 Protein
  • Interleukin-33
  • T Cell Transcription Factor 1