Cell Reports (May 2023)

A single-cell view on host immune transcriptional response to in vivo BCG-induced trained immunity

  • Wenchao Li,
  • Simone J.C.F.M. Moorlag,
  • Valerie A.C.M. Koeken,
  • Rutger J. Röring,
  • L. Charlotte J. de Bree,
  • Vera P. Mourits,
  • Manoj K. Gupta,
  • Bowen Zhang,
  • Jianbo Fu,
  • Zhenhua Zhang,
  • Inge Grondman,
  • Krista E. van Meijgaarden,
  • Liang Zhou,
  • Ahmed Alaswad,
  • Leo A.B. Joosten,
  • Reinout van Crevel,
  • Cheng-Jian Xu,
  • Mihai G. Netea,
  • Yang Li

Journal volume & issue
Vol. 42, no. 5
p. 112487

Abstract

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Summary: Bacillus Calmette-Guérin (BCG) vaccination is a prototype model for the study of trained immunity (TI) in humans, and results in a more effective response of innate immune cells upon stimulation with heterologous stimuli. Here, we investigate the heterogeneity of TI induction by single-cell RNA sequencing of immune cells collected from 156 samples. We observe that both monocytes and CD8+ T cells show heterologous transcriptional responses to lipopolysaccharide, with an active crosstalk between these two cell types. Furthermore, the interferon-γ pathway is crucial in BCG-induced TI, and it is upregulated in functional high responders. Data-driven analyses and functional experiments reveal STAT1 to be one of the important transcription factors for TI shared in all identified monocyte subpopulations. Finally, we report the role of type I interferon-related and neutrophil-related TI transcriptional programs in patients with sepsis. These findings provide comprehensive insights into the importance of monocyte heterogeneity during TI in humans.

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