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Updated: May 31, 2026
07:01
Direct Mouse Trauma/Burn Model of Heterotopic Ossification
Published on: August 6, 2015
Substance P signaling mediates BMP-dependent heterotopic ossification.
Lixin Kan1, Vitali Y Lounev, Robert J Pignolo
1Department of Neurology, Northwestern University Feinberg Medical School, Chicago, Illinois 60611, USA. l-kan@northwestern.edu
Journal of Cellular Biochemistry
|July 13, 2011
Summary
Substance P (SP), a neuro-inflammatory factor, drives heterotopic ossification (HO) by activating its receptor NK1r. Blocking this pathway prevents HO formation, offering new therapeutic targets for this disabling condition.
Area of Science:
- Neuroscience
- Bone Biology
- Inflammation Research
Background:
- Heterotopic ossification (HO) is a disabling condition often linked to neurological injury and inflammation.
- Overactive bone morphogenetic protein (BMP) signaling is implicated in HO, but the precise inductive factors remain unclear.
Purpose of the Study:
- To investigate the role of neuro-inflammatory factors in the early stages of heterotopic ossification (HO).
- To identify potential molecular targets for preventing HO formation.
Main Methods:
- Examined Substance P (SP) expression in human HO tissues and mouse models.
- Utilized genetic models including preprotachykinin (PPT) gene mutations and NK1r gene deletions.
- Investigated the effects of sensory neuron ablation and NK1r antagonists on HO induction.
Main Results:
- Substance P (SP) expression was significantly elevated in early HO lesions in both human patients and mouse models.
- Disruption of the SP/NK1r pathway, including genetic ablation of SP or NK1r, profoundly inhibited injury-induced HO.
- Targeting SP(+) sensory neurons or NK1r-expressing mast cells also prevented HO formation.
Conclusions:
- A neuro-inflammatory circuit involving Substance P (SP) and its receptor NK1r is crucial for inducing and amplifying BMP-dependent HO.
- The SP/NK1r pathway represents a novel therapeutic target for the prevention of heterotopic ossification.
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