DPSC-Derived Extracellular Vesicles Promote Rat Jawbone Regeneration

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Oral and Maxillofacial Surgery

Background:

• Large jawbone defects pose significant challenges in head and neck surgery.
• Tissue engineering and stem cell advancements are driving regenerative strategies for jawbone repair.
• Mesenchymal stem cell-derived extracellular vesicles (EVs) exhibit therapeutic potential through trophic activities.

Purpose of the Study:

• To investigate the osteogenic effects of dental pulp stem cell-derived EVs (DPSC-EVs) on jawbone marrow-derived MSCs (JB-MSCs) in vitro.
• To evaluate the osteoinductive capacity of DPSC-EVs in a rat mandibular bone defect model in vivo.
• To explore DPSC-EVs as a cell-free therapeutic option for craniofacial bone regeneration.

Main Methods:

• In vitro: Cultured JB-MSCs treated with DPSC-EVs to assess gene expression (RUNX2, ALP, OCN) and osteogenic differentiation.
• In vitro comparison: DPSC-EVs efficacy was compared to bone morphogenetic protein-2 (BMP-2).
• In vivo: Mandibular bone defects in rats were treated with DPSC-EVs loaded onto a collagen membrane, followed by analysis of wound closure and new bone formation.

Main Results:

• DPSC-EVs were efficiently uptaken by JB-MSCs, significantly promoting osteogenic gene expression and differentiation.
• The in vitro osteogenic effect of DPSC-EVs was comparable to BMP-2.
• In vivo, DPSC-EV treatment accelerated wound closure and increased new bone density in mandibular defects.

Conclusions:

• DPSC-EVs demonstrate significant osteogenic and osteoinductive effects, supporting jawbone regeneration.
• DPSC-EVs represent a promising cell-free therapeutic strategy for craniofacial bone defects.
• The accessibility and properties of DPSCs make DPSC-EVs a viable option for regenerative therapies.