Determining a clinically relevant strategy for bone tissue engineering: an "all-in-one" study in nude mice

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Craniofacial Surgery

Background:

• Autologous bone grafting (BG) is the gold standard for large craniofacial defects.
• Calcium phosphate (CaP) biomaterials require combination with cells for bone tissue engineering (BTE).
• Total bone marrow (TBM) and mesenchymal stem cells (MSC) are common cell sources for BTE.

Purpose of the Study:

• To compare eight clinically relevant bone tissue engineering (BTE) methods.
• To determine the most beneficial BTE strategy for patients with craniofacial defects.

Main Methods:

• Harvested BG, TBM, and MSC from transgenic rats expressing GFP.
• Mixed progenitor cells with CaP materials and implanted subcutaneously into nude mice.
• Evaluated bone formation via histology, SEM, and tracked GFP cells using fluorescence microscopy after eight weeks.

Main Results:

• Bone formation occurred in four groups: CaP with BG, CaP with TBM, biphasic calcium phosphate (BCP) with 2D cultured cells, and BCP with 3D cultured cells.
• Abundant de novo bone formed in CaP/BG and CaP/TBM groups.
• Limited bone formation observed in BCP groups with cultured cells.

Conclusions:

• Only TBM and BG groups showed GFP-positive cells, indicating donor cell contribution to bone formation.
• TBM-based BTE provides abundant de novo bone without requiring bone harvest or cell culture.
• TBM is recommended for clinical applications in craniofacial defect reconstruction.