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Cell Rep. 2017 Aug 22;20(8):1830-1843. doi: 10.1016/j.celrep.2017.08.009.

Triggering of NOD2 Receptor Converts Inflammatory Ly6Chigh into Ly6Clow Monocytes with Patrolling Properties.

Author information

1
Laboratory of Innate Immunology, Centre de recherche du CHU de Québec-Université Laval, Québec, QC G1V 4G2, Canada.
2
Centre de recherche du CHU de Québec, Université Laval, Québec, QC G1V 4G2, Canada.
3
Department of Molecular Medicine, Université Laval, Québec, QC G1V 4G2, Canada; Centre de recherche du CHU de Québec, Université Laval, Québec, QC G1V 4G2, Canada.
4
Laboratory of Innate Immunology, Centre de recherche du CHU de Québec-Université Laval, Québec, QC G1V 4G2, Canada; Department of Molecular Medicine, Université Laval, Québec, QC G1V 4G2, Canada. Electronic address: jean.gosselin@crchudequebec.ulaval.ca.

Abstract

The signals that regulate the fate of circulating monocytes remain unknown. In the present study, we demonstrate that triggering of the NOD2 receptor by muramyl dipeptide (MDP) converts inflammatory Ly6Chigh monocytes into patrolling Ly6Clow monocytes. Administration of MDP to Nr4a1-/- mice, which lack Ly6Clow monocytes, or to Ly6Clow-depleted mice led to the emergence of blood-patrolling monocytes with a profile similar to that of Ly6Clow monocytes, including high expression of CX3CR1 and LFA1. Using intravital microscopy in animal models of inflammatory diseases, we also found that converted Ly6Chigh monocytes patrol the endothelium of blood vessels and that their presence contributes to a reduction in the inflammatory response following MDP injection. Our results demonstrate that NOD2 contributes to the regulation of blood monocytes and suggest that it could be therapeutically targeted to treat inflammatory diseases.

KEYWORDS:

NOD2 agonists; NOD2 receptor; inflammation; inflammatory monocytes; innate response; monocyte polarization; patrolling monocytes

PMID:
28834747
DOI:
10.1016/j.celrep.2017.08.009
[Indexed for MEDLINE]
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