Ly6CHi Blood Monocyte/Macrophage Drive Chronic Inflammation and Impair Wound Healing in Diabetes Mellitus

Arteriosclerosis, Thrombosis, and Vascular Biology
Andrew KimballKatherine A Gallagher

Abstract

Wound monocyte-derived macrophage plasticity controls the initiation and resolution of inflammation that is critical for proper healing, however, in diabetes mellitus, the resolution of inflammation fails to occur. In diabetic wounds, the kinetics of blood monocyte recruitment and the mechanisms that control in vivo monocyte/macrophage differentiation remain unknown. Here, we characterized the kinetics and function of Ly6CHi [Lin- (CD3-CD19-NK1.1-Ter-119-) Ly6G-CD11b+] and Ly6CLo [Lin- (CD3-CD19-NK1.1-Ter-119-) Ly6G-CD11b+] monocyte/macrophage subsets in normal and diabetic wounds. Using flow-sorted tdTomato-labeled Ly6CHi monocyte/macrophages, we show Ly6CHi cells transition to a Ly6CLo phenotype in normal wounds, whereas in diabetic wounds, there is a late, second influx of Ly6CHi cells that fail transition to Ly6CLo. The second wave of Ly6CHi cells in diabetic wounds corresponded to a spike in MCP-1 (monocyte chemoattractant protein-1) and selective administration of anti-MCP-1 reversed the second Ly6CHi influx and improved wound healing. To examine the in vivo phenotype of wound monocyte/macrophages, RNA-seq-based transcriptome profiling was performed on flow-sorted Ly6CHi [Lin-Ly6G-CD11b+] and Ly6CLo [Lin-Ly6G-CD11b+] cell...Continue Reading

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