Human decellularized bone scaffolds from aged donors show improved osteoinductive capacity compared to young donor...

Area of Science:

• Biomaterials Science
• Orthopedic Research
• Regenerative Medicine

Background:

• Allograft bone use requires safe, effective scaffolds.
• Decellularization creates acellular scaffolds for bone regeneration.
• Donor age impact on scaffold osteoinductivity is unclear.

Purpose of the Study:

• Investigate donor age effects on acellular bone scaffold osteogenic differentiation.
• Determine if aged donor bone scaffolds enhance mesenchymal stem cell (MSC) bone formation.
• Correlate scaffold properties with donor age and osteogenic potential.

Main Methods:

• Generated acellular bone scaffolds from young and old human donors.
• Seeded scaffolds with bone marrow MSCs (BM-MSCs) from young and old donors.
• Analyzed osteogenic gene expression, alkaline phosphatase (ALP) activity, and conditioned media factors (ELISA, Luminex).
• Performed structural analysis (porosity) of young and old donor bone.

Main Results:

• All scaffold combinations promoted osteogenic differentiation.
• BM-MSCs on old donor bone scaffolds showed significantly greater osteogenic gene expression and ALP activity.
• Old donor bone conditioned media enhanced osteogenesis compared to young donor media.
• Old donor bone exhibited increased porosity and lower IGFBP1 levels.

Conclusions:

• Decellularized bone scaffolds support MSC osteogenic differentiation regardless of donor age.
• Older donor bone scaffolds demonstrate superior osteoinductive capacity.
• Increased porosity and reduced IGFBP1 bioavailability in older bone may enhance osteogenesis, explaining clinical allograft success.