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Published on: September 11, 2015
Octacalcium phosphate-precipitated alginate scaffold for bone regeneration
Takeshi Fuji1, Takahisa Anada, Yoshitomo Honda
1Division of Craniofacial Function Engineering, Tohoku University Graduate School of Dentistry, Aoba-ku, Sendai, Japan.
Tissue Engineering. Part A
|May 22, 2009
Summary
Octacalcium phosphate (OCP)-precipitated alginate (Alg) scaffolds enhance osteoblastic cell growth and bone regeneration. Larger pore sizes in these OCP-Alg scaffolds significantly improved cell proliferation and bone healing.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Alginate (Alg) is a common biomaterial for scaffolds but lacks inherent cell attachment capabilities.
- Octacalcium phosphate (OCP) is a calcium phosphate material with potential osteoconductive properties.
- Investigating OCP's effect on Alg scaffolds is crucial for improving bone regeneration applications.
Purpose of the Study:
- To evaluate if OCP-precipitated Alg scaffolds promote osteoblastic cell proliferation and bone regeneration compared to Alg alone.
- To assess the influence of pore size within Alg/OCP scaffolds on osteoconductive capabilities.
- To determine OCP's potential as a surface modifier for non-cell-interactive polymeric scaffolds.
Main Methods:
- Fabrication of Alg/OCP scaffolds with varying pore sizes using OCP crystal precipitation.
- Characterization of scaffold porosity and bimodal pore distribution (ultrafine ~100 nm, large 6.0–51.7 µm).
- In vitro assessment of mouse bone marrow stromal ST-2 cell proliferation after 3 days.
- In vivo evaluation of bone regeneration in mouse calvaria critical-sized defects after 21 days.
Main Results:
- Alg/OCP scaffolds exhibited over 86% porosity with a bimodal pore size distribution.
- ST-2 cell proliferation and bone regeneration significantly increased with larger pore sizes.
- The scaffold with 51.7 µm pores demonstrated the highest levels of cell proliferation and bone regeneration.
Conclusions:
- OCP-precipitated Alg provides an improved scaffold for osteoblast attachment, proliferation, and bone regeneration in a 3D environment.
- Pore size is a critical factor influencing the osteoconductive performance of Alg/OCP scaffolds.
- OCP shows promise as an effective material for modifying non-cell-interactive scaffolds like Alg to enhance osteogenesis.
