Cited by 190Immune Response and InflammationPneumonia and Respiratory InfectionsChemokine receptors and signaling

Nod2 sensing of lysozyme-digested peptidoglycan promotes macrophage recruitment and clearance of S. pneumoniae colonization in mice

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Davis, Kimberly M., Nakamura, Shigeki, Weiser, Jeffrey N.·2011·Journal of Clinical Investigation

Abstract

Streptococcus pneumoniae colonizes the mucosal surface of the human upper respiratory tract. A colonization event is gradually cleared through phagocytosis by monocytes/macrophages that are recruited to the airway lumen. Here, we sought to define the bacterial and host factors that promote monocyte/macrophage influx and S. pneumoniae clearance using intranasal bacterial challenge in mice. We found that the recruitment of monocytes/macrophages required their expression of the chemokine receptor CCR2 and correlated with expression of the CCR2 ligand CCL2. Production of CCL2 and monocyte/macrophage recruitment were deficient in mice lacking digestion of peptidoglycan by lysozyme (LysM) and cytosolic sensing of the products of digestion by Nod2. Ex vivo macrophages produced CCL2 following bacterial uptake, digestion by LysM, and sensing of peptidoglycan by Nod2. Sensing of digested peptidoglycan by Nod2 also required the pore-forming toxin pneumolysin. The generation of an adaptive immune response, as measured by anti-pneumococcal antibody titers, was also LysM- and Nod2-dependent. Together, our data suggest that bacterial uptake by professional phagocytes is followed by LysM-mediated digestion of S. pneumoniae-derived peptidoglycan, sensing of the resulting products by Nod2, release of the chemokine CCL2, and CCR2-dependent recruitment of the additional monocytes/macrophages required for the clearance of an S. pneumoniae colonization event.

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  1. Janeway CA Jr, Medzhitov R. Innate immune recog- nition. Annu Rev Immunol. 2002;20:197-216.
  2. Moreira L, et al. The TLR2-MyD88-NOD2-RIPK2 signalling axis regulates a balanced pro-inflamma- tory cytokine response to Gram-positive cell walls. Cell Microbiol. 2008;10(10):2067-2077.
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Authors
Davis, K. M., Nakamura, S., & Weiser, J. N.
Affiliations
  • University of Pennsylvania (US)
  • Nagasaki University (JP)
Corresponding author
Weiser, Jeffrey N.
Venue
Journal of Clinical Investigation
Published
2011-09-01
Volume
121
Issue
9
Pages
3666-3676
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2160611039
Cited by
190
References
74
Citations by year
2026: 6 · 2025: 3 · 2024: 3 · 2023: 9 · 2022: 7 · 2021: 9 · 2020: 15 · 2019: 16 · 2018: 11 · 2017: 17 · 2016: 11 · 2015: 23 · 2014: 29 · 2013: 12 · 2012: 15
FWCI
8.52
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Pennsylvania
  • U.S. Public Health Service
  • National Institute of Allergy and Infectious Diseases (R01AI038446, AI 38446, R21AI044231, R01AI044231, AI44231, R37AI038446)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK50306, P30DK050306)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Epidemiology › Pneumonia and Respiratory Infections
  • Health Sciences › Medicine › Oncology › Chemokine receptors and signaling
Keywords
NOD2, lysozyme, Streptococcus pneumoniae, pneumococcal carriage, macrophage recruitment, monocyte recruitment, CCR2, MCP-1, pneumolysin, innate immune recognition, adaptive immune response, intranasal infection, upper respiratory tract
MeSH terms
Animals, Humans, Macrophages, Mice, Inbred C57BL, Muramidase, Peptidoglycan, Phagocytes, Pneumococcal Infections, Streptococcus pneumoniae, Mice, Knockout, Chemokine CCL2, Toll-Like Receptor 2, Mice, Nod2 Signaling Adaptor Protein, Receptors, CCR2, Adaptive Immunity

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