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The matricellular protein CCN1 mediates neutrophil efferocytosis in cutaneous wound healing

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  • Joon-Il Jun

    (College of Medicine, University of Illinois at Chicago)

  • Ki-Hyun Kim

    (College of Medicine, University of Illinois at Chicago)

  • Lester F. Lau

    (College of Medicine, University of Illinois at Chicago)

Abstract

Neutrophil infiltration constitutes the first step in wound healing, although their timely clearance by macrophage engulfment, or efferocytosis, is critical for efficient tissue repair. However, the specific mechanism for neutrophil clearance in wound healing remains undefined. Here we uncover a key role for CCN1 in neutrophil efferocytosis by acting as a bridging molecule that binds phosphatidylserine, the ‘eat-me’ signal on apoptotic cells and integrins αvβ3/αvβ5 in macrophages to trigger efferocytosis. Both knockin mice expressing a mutant CCN1 that is unable to bind αvβ3/αvβ5 and mice with Ccn1 knockdown are defective in neutrophil efferocytosis, resulting in exuberant neutrophil accumulation and delayed healing. Treatment of wounds with CCN1 accelerates neutrophil clearance in both Ccn1 knockin mice and diabetic Leprdb/db mice, which suffer from neutrophil persistence and impaired healing. These findings establish CCN1 as a critical opsonin in skin injury and suggest a therapeutic potential for CCN1 in certain types of non-healing wounds.

Suggested Citation

  • Joon-Il Jun & Ki-Hyun Kim & Lester F. Lau, 2015. "The matricellular protein CCN1 mediates neutrophil efferocytosis in cutaneous wound healing," Nature Communications, Nature, vol. 6(1), pages 1-14, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8386
    DOI: 10.1038/ncomms8386
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    Cited by:

    1. Jong Hoon Won & Jacob S. Choi & Joon-Il Jun, 2022. "CCN1 interacts with integrins to regulate intestinal stem cell proliferation and differentiation," Nature Communications, Nature, vol. 13(1), pages 1-15, December.

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