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DEL-1 promotes macrophage efferocytosis and clearance of inflammation.

Nat. Immunol. 20, 40-49 (2019)
Open Access Green as soon as Postprint is submitted to ZB.
Resolution of inflammation is essential for tissue homeostasis and represents a promising approach to inflammatory disorders. Here we found that developmental endothelial locus-1 (DEL-1), a secreted protein that inhibits leukocyte-endothelial adhesion and inflammation initiation, also functions as a non-redundant downstream effector in inflammation clearance. In human and mouse periodontitis, waning of inflammation was correlated with DEL-1 upregulation, whereas resolution of experimental periodontitis failed in DEL-1 deficiency. This concept was mechanistically substantiated in acute monosodium-urate-crystalinduced inflammation, where the pro-resolution function of DEL-1 was attributed to effective apoptotic neutrophil clearance (efferocytosis). DEL-1-mediated efferocytosis induced liver X receptor-dependent macrophage reprogramming to a proresolving phenotype and was required for optimal production of at least certain specific pro-resolving mediators. Experiments in transgenic mice with cell-specific overexpression of DEL-1 linked its anti-leukocyte-recruitment action to endothelial cell-derived DEL-1 and its efferocytic/pro-resolving action to macrophage-derived DEL-1. Thus, the compartmentalized expression of DEL-1 facilitates distinct homeostatic functions in an appropriate context that can be harnessed therapeutically.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Developmental Endothelial Locus-1; Gingival Crevicular Fluid; Resolving Lipid Mediators; Apoptotic Cells; Resolution-phase; Mast-cells; In-vitro; Receptor; Periodontitis; Model
Reviewing status
Institute(s) Institute for Pancreatic Beta Cell Research (IPI)