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Updated: Sep 11, 2025
07:01
Direct Mouse Trauma/Burn Model of Heterotopic Ossification
Published on: August 6, 2015
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When Bone Forms Where It Shouldn't: Heterotopic Ossification in Muscle Injury and Disease
Anthony Facchin1, Sophie Lemaire2, Li Gang Toner2
1Centre Hospitalier Universitaire de Québec-Université Laval Research Center (CHUQ-CHUL), Axe Neurosciences, Université Laval, Quebec City, QC G1V 4G2, Canada.
International Journal of Molecular Sciences
|August 14, 2025
Summary
Heterotopic ossification (HO) is bone formation in soft tissues, often after nerve injury. This review details inflammation, progenitor cells, and treatments for this condition.
Area of Science:
- Pathology
- Cell Biology
- Regenerative Medicine
Background:
- Heterotopic ossification (HO) is abnormal bone growth in soft tissues, frequently occurring after trauma, surgery, or genetic disorders.
- Neurogenic HO (NHO) is a specific type of HO linked to central nervous system injuries.
- Understanding HO mechanisms is crucial for developing effective treatments.
Purpose of the Study:
- To review the cellular and molecular mechanisms underlying HO.
- To focus on the role of inflammation and progenitor cell reprogramming in HO pathogenesis.
- To discuss current and novel therapeutic strategies for HO.
Main Methods:
- Literature review of cellular and molecular mechanisms of HO.
- Analysis of inflammatory pathways, particularly M1 macrophage-derived cytokines.
- Examination of progenitor cell (fibro-adipogenic progenitor cells - FAPs) differentiation and reprogramming.
- Review of contributing factors like hypoxia, BMP signaling, and mechanotransduction.
- Assessment of neuroendocrine mediator roles in NHO.
- Evaluation of current treatment efficacies and limitations.
Main Results:
- HO is driven by sustained inflammation, with M1 macrophages releasing osteoinductive cytokines.
- These cytokines induce fibro-adipogenic progenitor cells (FAPs) to differentiate into osteoblasts, causing ectopic mineralization.
- Hypoxia, BMP signaling, and mechanotransduction further promote extracellular matrix remodeling and FAP osteogenic reprogramming.
- Neuroendocrine mediators exacerbate NHO by influencing inflammation and progenitor cell fate.
- Current treatments (NSAIDs, radiation, surgery) show limited efficacy and carry risks.
Conclusions:
- Inflammation and progenitor cell reprogramming are key drivers of HO.
- Neuroendocrine factors play a significant role in NHO development.
- Novel therapies targeting inflammation, neuropeptide signaling, and calcium metabolism are needed.
- More effective prevention and mitigation strategies for HO are required.
Keywords:
extracellular matrixfibro-adipogenic progenitor cellheterotopic ossificationlymphocytemacrophagemetabolismneuro-inflammationskeletal muscleMore Related Videos
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