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The pathological mechanisms leading to <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> remain unknown and consequently there are no therapeutic options to prevent or reduce <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content>. Genetically modified mouse models of rare genetic forms of heterotopic ossification (<jats:styled-content style=\"fixed-case\">HO<\/jats:styled-content>) exist, but their relevance to <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> is questionable. Consequently, we developed the first model of spinal cord injury (<jats:styled-content style=\"fixed-case\">SCI<\/jats:styled-content>)\u2010induced <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> in genetically unmodified mice. Formation of <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content>, measured by micro\u2010computed tomography, required the combination of both <jats:styled-content style=\"fixed-case\">SCI<\/jats:styled-content> and localized muscular inflammation. Our <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> model faithfully reproduced many clinical features of <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> in <jats:styled-content style=\"fixed-case\">SCI<\/jats:styled-content> patients and both human and mouse <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> tissues contained macrophages. Muscle\u2010derived mesenchymal progenitors underwent osteoblast differentiation <jats:italic>in vitro<\/jats:italic> in response to serum from <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> mice without additional exogenous osteogenic stimuli. Substance P was identified as a candidate <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> systemic neuropeptide, as it was significantly elevated in the serum of <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> patients. However, antagonism of substance P receptor in our <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> model only modestly reduced the volume of <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content>. In contrast, ablation of phagocytic macrophages with clodronate\u2010loaded liposomes reduced the size of <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> by 90%, supporting the conclusion that <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> is highly dependent on inflammation and phagocytic macrophages in soft tissues. Overall, we have developed the first clinically relevant model of <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> and demonstrated that a combined insult of neurological injury and soft tissue inflammation drives <jats:styled-content style=\"fixed-case\">NHO<\/jats:styled-content> pathophysiology. Copyright \u00a9 2015 Pathological Society of Great Britain and Ireland. Published by John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/path.4519","type":"journal-article","created":{"date-parts":[[2015,2,25]],"date-time":"2015-02-25T01:25:10Z","timestamp":1424827510000},"page":"229-240","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":142,"title":["Neurological heterotopic ossification following spinal cord injury is triggered by macrophage\u2010mediated inflammation in muscle"],"prefix":"10.1002","volume":"236","author":[{"given":"Fran\u00e7ois","family":"Gen\u00eat","sequence":"first","affiliation":[{"name":"Blood and Bone Diseases Programme, Mater Research Institute University of Queensland  Woolloongabba Australia"},{"name":"Department of Physical Medicine and Rehabilitation H\u00f4pital Raymond Poincar\u00e9  APHP, CIC\u2010IT 1429 Garches France"},{"name":"Universit\u00e9 Versailles Saint Quentin en Yvelines, END:ICAP U1179 INSERM, UFR des Sciences de la Sant\u00e9\u2013Simone Veil  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