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Regulation of heterotopic ossification through local inflammatory monocytes in a mouse model of aberrant wound healing

Huber, A. K.; Sorkin, M.; Hwang, C.; Carson, W. F.; Menon, R.; Li, J.; Vasquez, K.; Pagani, C.; Patel, N.; Li, S.; Visser, N.; Niknafs, Y.; Loder, S.; Scola, M.; Nycz, D.; Gallagher, K.; McCauley, L.; Xu, J.; James, A.; Agarwal, S.; Kunkel, S.; Mishina, Y.; Levi, B.

2019-12-11 immunology
10.1101/871574 bioRxiv
Show abstract

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 TGF{beta} levels help ameliorate HO. Our data thus implicate CD47 activation as a novel therapeutic approach for modulating monocyte/macrophage phenotypes, MSC differentiation and HO formation during wound healing.

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