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Expansion of Bone Precursors through Jun as a Novel Treatment for Osteoporosis-Associated Fractures
Tristan Lerbs1, Lu Cui1, Claire Muscat1
1Department of Pathology, Stanford School of Medicine, 300 Pasteur Drive, Stanford, CA 94305, USA.
Abstract:
Osteoporosis and osteoporotic fractures lead to decreased life quality and high healthcare costs. Current treatments prevent losses in bone mass and fractures to some extent but have side effects. Therefore, better therapies are needed. This study investigated whether the transcription factor Jun has a specific pro-osteogenic potency and whether modulating Jun could serve as a novel treatment for osteoporosis-associated fractures. We demonstrate that ectopically transplanted whole bones and distinct osteoprogenitors increase bone formation. Perinatal Jun induction disturbs growth plate architecture, causing a striking phenotype with shortened and thickened bones. Molecularly, Jun induces hedgehog signaling in skeletal stem cells. Therapeutically, Jun accelerates bone growth and healing in a drilling-defect model. Altogether, these results demonstrate that Jun drives bone formation by expanding osteoprogenitor populations and forcing them into the bone fate, providing a rationale for future clinical applications.
Insights
The transcription factor Jun promotes bone formation by expanding skeletal stem cells. Modulating Jun offers a potential new therapy for osteoporosis and bone fracture healing.
Area of Science:
- Biochemistry
- Molecular Biology
- Orthopedics
Background:
- Osteoporosis and fractures significantly reduce quality of life and increase healthcare expenses.
- Existing treatments for bone loss offer partial protection but are associated with adverse effects.
- Novel therapeutic strategies are required to address the limitations of current osteoporosis treatments.
Purpose of the Study:
- To determine if the transcription factor Jun possesses pro-osteogenic properties.
- To explore the potential of modulating Jun as a novel therapeutic approach for osteoporosis-associated fractures.
Main Methods:
- Investigated Jun's role in bone formation using ectopic transplantation models.
- Analyzed the effects of perinatal Jun induction on skeletal development and growth plate architecture.
- Examined the molecular mechanisms, including hedgehog signaling in skeletal stem cells.
- Assessed Jun's therapeutic potential in a drilling-defect bone healing model.
Main Results:
- Ectopic transplantation of bone and osteoprogenitors enhanced bone formation.
- Perinatal Jun induction resulted in shortened, thickened bones due to disturbed growth plate architecture.
- Jun was found to induce hedgehog signaling in skeletal stem cells.
- Jun administration accelerated bone growth and fracture healing in vivo.
Conclusions:
- The transcription factor Jun significantly drives bone formation by increasing osteoprogenitor populations and directing their differentiation towards bone.
- Jun's ability to promote bone growth and healing provides a strong rationale for its potential clinical application in treating osteoporosis and related fractures.
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