Surgical excision of heterotopic ossification leads to re-emergence of mesenchymal stem cell populations responsible for recurrence

Shailesh Agarwal, Shawn Loder, David Cholok, John Li, Chris Breuler, James Drake, Cameron Brownley, Joshua Peterson, Shuli Li, Benjamin Levi

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Trauma-induced heterotopic ossification (HO) occurs after severe musculoskeletal injuries and burns, and presents a significant barrier to patient rehabilitation. Interestingly, the incidence of HO significantly increases with repeated operations and after resection of previous HO. Treatment of established heterotopic ossification is challenging because surgical excision is often incomplete, with evidence of persistent heterotopic bone. As a result, patients may continue to report the signs or symptoms of HO, including chronic pain, nonhealing wounds, and joint restriction. In this study, we designed a model of recurrent HO that occurs after surgical excision of mature HO in a mouse model of hind-limb Achilles’ tendon transection with dorsal burn injury. We first demonstrated that key signaling mediators of HO, including bone morphogenetic protein signaling, are diminished in mature bone. However, upon surgical excision, we have noted upregulation of downstream mediators of osteogenic differentiation, including pSMAD 1/5. Additionally, surgical excision resulted in reemergence of a mesenchymal cell population marked by expression of platelet-derived growth factor receptor-a (PDGFRa) and present in the initial developing HO lesion but absent in mature HO. In the recurrent lesion, these PDGFRa1mesenchymal cells are also highly proliferative, similar to the initial developing HO lesion. These findings indicate that surgical excision ofHOresults in recurrence through similar mesenchymal cell populations and signaling mechanisms that are present in the initial developing HO lesion. These results are consistent with findings in patients thatnewfoci of ectopic bone can develop in excision sites and are likely related to de novo formation rather than extension of unresected bone.

Original languageEnglish (US)
Pages (from-to)799-806
Number of pages8
JournalStem Cells Translational Medicine
Volume6
Issue number3
DOIs
StatePublished - Mar 2017
Externally publishedYes

Keywords

  • Bone
  • Chondrogenesis
  • Extremity trauma
  • Heterotopic ossification
  • Mesenchymal stem cell
  • Tissue regeneration

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology

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