Characterization of the Anti-Inflammatory Capacity of IL-10-Producing Neutrophils in Response to Streptococcus pneumoniae Infection

Liliana A. González, Felipe Melo-González, Valentina P. Sebastián, Omar P. Vallejos, Loreani P. Noguera, Isidora D. Suazo, Bárbara M. Schultz, Andrés H. Manosalva, Hernán F. Peñaloza, Jorge A. Soto, Dane Parker, Claudia A. Riedel, Pablo A. González, Alexis M. Kalergis, Susan M. Bueno

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Neutrophils are immune cells classically defined as pro-inflammatory effector cells. However, current accumulated evidence indicates that neutrophils have more versatile immune-modulating properties. During acute lung infection with Streptococcus pneumoniae in mice, interleukin-10 (IL-10) production is required to temper an excessive lung injury and to improve survival, yet the cellular source of IL-10 and the immunomodulatory role of neutrophils during S. pneumoniae infection remain unknown. Here we show that neutrophils are the main myeloid cells that produce IL-10 in the lungs during the first 48 h of infection. Importantly, in vitro assays with bone-marrow derived neutrophils confirmed that IL-10 can be induced by these cells by the direct recognition of pneumococcal antigens. In vivo, we identified the recruitment of two neutrophil subpopulations in the lungs following infection, which exhibited clear morphological differences and a distinctive profile of IL-10 production at 48 h post-infection. Furthermore, adoptive transfer of neutrophils from WT mice into IL-10 knockout mice (Il10-/-) fully restored IL-10 production in the lungs and reduced lung histopathology. These results suggest that IL-10 production by neutrophils induced by S. pneumoniae limits lung injury and is important to mediate an effective immune response required for host survival.

Original languageEnglish (US)
Article number638917
JournalFrontiers in immunology
Volume12
DOIs
StatePublished - Apr 28 2021

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology

Keywords

  • IL-10-producing neutrophils
  • Streptococcus pneumoniae
  • adoptive neutrophil transfer
  • interleukin-10
  • pneumonia

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