Decellularization of Massive Bone Allografts By Perfusion: A New Protocol for Tissue Engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Orthopedic Surgery

Background:

• Massive bone allografts are vital for large bone defect reconstruction but face high complication rates.
• Graft immunogenicity from residual cells is a key factor contributing to these complications.
• Decellularization via perfusion offers a potential solution to enhance allograft efficacy.

Purpose of the Study:

• To evaluate a sodium hydroxide-based perfusion decellularization protocol for porcine long bones.
• To assess the effectiveness of decellularization and extracellular matrix preservation.
• To determine the biocompatibility and osteogenic potential of the decellularized bone grafts.

Main Methods:

• Utilized 72 porcine long bones for decellularization using a sequential solvent perfusion technique through nutrient arteries.
• Performed qualitative (histology, IHC) and quantitative (fluoroscopic absorbance, ELISA) analyses.
• Assessed cytotoxicity, cell compatibility, and osteoblastic differentiation induction.

Main Results:

• Achieved high-quality decellularization, confirming perfusion is essential for complete cell removal.
• Demonstrated excellent preservation of bone composition, microarchitecture, Haversian systems, and vascular networks.
• Reduced human leukocyte antigen antigenic load by over 50% and retained essential growth factors.
• Confirmed cell compatibility, non-cytotoxicity, and ability to induce osteoblastic differentiation.

Conclusions:

• The developed decellularization/perfusion protocol effectively creates decellularized bone graft models.
• These grafts retain their vascular network and biological properties, making them suitable for in vivo implantation or as seeding matrices.