Osteogenic cell sheets reinforced with photofunctionalized micro-thin titanium.
Manabu Ishijima1, Makoto Hirota2, Wonhee Park2
1Laboratory of Bone and Implant Sciences (LBIS), The Weintraub Center for Reconstructive Biotechnology, Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry, UCLA School of Dentistry, Los Angeles, CA, USA Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan.
Journal of Biomaterials Applications
|January 22, 2015
Summary
Researchers developed titanium-reinforced osteogenic cell sheets for bone regeneration. UV-photofunctionalized titanium is crucial for structural stability and cell adherence, enabling potential new bone tissue engineering devices.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Cell sheet technology facilitates soft tissue repair using intact extracellular matrix.
- Existing methods lack robust solutions for bone tissue engineering and regeneration.
Purpose of the Study:
- To hypothesize and construct titanium-reinforced cell sheets for bone tissue engineering.
- To investigate the technical and material requirements for stable, osteogenic cell sheet fabrication.
Main Methods:
- Prepared 50-µm-thick, aperture-containing titanium plates, some UV-photofunctionalized.
- Cultured rat calvarial periosteum-derived cells into double-sided cell sheets sandwiching titanium.
- Assessed structural integrity, osteogenic phenotypes (ALP, mineralization), and cell adhesion (vinculin) under different conditions.
Main Results:
- Double-sided cell sheets on untreated titanium deformed within 4 days.
- Titanium-reinforced cell sheets on UV-photofunctionalized titanium remained stable for 14 days.
- Photofunctionalization enhanced cell attachment, retention, and vinculin expression, maintaining osteogenic properties.
Conclusions:
- Identified critical technical (double-sided sheets, thin apertures) and material (UV-photofunctionalized titanium) requirements.
- Demonstrated structural stability and osteogenic potential of titanium-reinforced cell sheets.
- Proposed these constructs as promising osteogenic devices for future in vivo studies.
