The performance of bone marrow mesenchymal stem cell--implant complexes prepared by cell sheet engineering techniques

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Bone marrow derived mesenchymal stem cells (MSCs) are crucial for bone regeneration.
• Developing functional MSC-implant complexes is key for orthopedic applications.
• Cell sheet engineering offers a promising method for creating 3D cell constructs.

Purpose of the Study:

• To investigate the feasibility of constructing MSC-implants using cell sheet engineering.
• To evaluate the osteogenic and vascularization potential of MSC-implants with titanium and zirconia.
• To assess the in vitro and in vivo performance of these novel MSC-implant constructs.

Main Methods:

• Rabbit bone marrow derived MSCs were cultured into cell sheets.
• MSC sheets were wrapped around surface-modified titanium and zirconia implants.
• Constructed MSC-implants were cultured in osteogenic medium and evaluated in vitro.
• In vivo studies involved subcutaneous transplantation in SCID mice for eight weeks.

Main Results:

• Layered MSC sheets integrated well with both titanium and zirconia implants, remaining viable.
• In vitro cultures showed osteogenic differentiation with elevated alkaline phosphatase activity and relevant protein expression.
• In vivo, MSC-titanium implants promoted endochondral ossification, while MSC-zirconia implants induced intramembranous ossification.
• Both implant types demonstrated osteogenic and vascularization capabilities.

Conclusions:

• Cell sheet engineering successfully created functional MSC-implants with routine biomaterials.
• These MSC-implants exhibit significant osteogenic and vascularization potential.
• This technique provides a novel approach for implant surface modification in regenerative medicine.