Construction and evaluation of a novel tissue-engineered bone device.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Engineering

Background:

• Tissue-engineered bones (TEB) show promise for large segmental bone defects.
• Viable cells in TEB present significant technical and logistical challenges for clinical application.

Purpose of the Study:

• To develop novel functional TEB (fTEB) using devitalized mesenchymal stem cells (MSCs) while preserving essential functional proteins.
• To evaluate the efficacy of fTEB-conditioned media (fTEB-CM) in promoting host MSCs' biological functions.

Main Methods:

• MSCs were seeded onto demineralized bone matrix (DBM) scaffolds to create TEB.
• fTEB were generated using deep hyperthermia treatment to devitalize MSCs but retain proteins.
• Total proteins were extracted, and conditioned media (CM) were prepared from fTEB.
• The impact of fTEB-CM on MSC proliferation, differentiation, and migration was assessed.

Main Results:

• fTEB retained functional proteins from MSCs after devitalization via lyophilization.
• fTEB demonstrated superior induction of MSC migration, proliferation, and osteogenic differentiation compared to DBM scaffolds alone.
• The study identified key cytokines present within fTEB.

Conclusions:

• fTEB represent a promising alternative to conventional TEB, addressing limitations associated with viable cells.
• The development of fTEB offers potential as off-the-shelf bone substitutes for clinical use.
• fTEB could meet the substantial clinical demand for effective bone graft materials.