Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-14172-4
Keywords
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Funding
- Plastic Surgery Foundation National Endowment Award
- NIH/NIAMS [R01 AR070773, K08 AR068316]
- NIH/NIDCR [R21 DE027922]
- USAMRAA through the Peer Reviewed Medical Research Program [W81XWH-18-1-0121, W81XWH-18-1-0336]
- Department of Defense through the Broad Agency Announcement [BA160256]
- American Cancer Society [RSG-18-027-01-CSM]
- Orthopaedic Research and Education Foundation
- Musculoskeletal Transplant Foundation
- Maryland Stem Cell Research Foundation
- DoD [W81XWH-11-2-0073]
- NIH [R01DE020843]
- Howard Hughes Medical Institute Medical Research Fellowship
- NIH, NIAMS [NIH1R01AR071379]
- ACS Clowes Award
- International Fibrodysplasia Ossificans Progressiva Association Research Award
- NIH, NIGMS [K08GM109105, R01GM123069]
- [DK053904]
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Heterotopic ossification (HO) is an aberrant regenerative process with ectopic bone induction in response to musculoskeletal trauma, in which mesenchymal stem cells (MSC) differentiate into osteochondrogenic cells instead of myocytes or tenocytes. Despite frequent cases of hospitalized musculoskeletal trauma, the inflammatory responses and cell population dynamics that regulate subsequent wound healing and tissue regeneration are still unclear. Here we examine, using a mouse model of trauma-induced HO, the local microenvironment of the initial post-injury inflammatory response. Single cell transcriptome analyses identify distinct monocyte/macrophage populations at the injury site, with their dynamic changes over time elucidated using trajectory analyses. Mechanistically, transforming growth factor beta-1 (TGF beta 1)-producing monocytes/macrophages are associated with HO and aberrant chondrogenic progenitor cell differentiation, while CD47-activating peptides that reduce systemic macrophage TGF beta levels and help ameliorate HO. Our data thus implicate CD47 activation as a therapeutic approach for modulating monocyte/macrophage phenotypes, MSC differentiation and HO formation during wound healing.
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