Kyushu University Academic Staff Educational and Research Activities Database
List of Books
Takahisa Anada Last modified date:2024.06.03

Associate Professor / Department of Soft Materials Chemistry / Institute for Materials Chemistry and Engineering

1. Shinji Kamakura, Takahisa Anada, Osamu Suzuki, Bone regeneration by octacalcium phosphate and collagen composites, Nova Science Publishers, Inc., 177-202, 2010.01, Octacalcium phosphate (Ca8H2(PO4)6·5H2O; OCP) is a calcium phosphate and has been suggested to be a precursor of biological apatite crystals in bones and teeth. The importance of synthetic OCP as a bone substitute material was recently recognized in the field of tissue engineering for bone regeneration. Our previous studies elucidated the below-mentioned phenomena by using a rat calvarial defect model. OCP irreversibly converts to the apatitic phase, and the process of OCP-apatite conversion is involved in bone regeneration. Implanted OCP enhances bone regeneration more than hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP), which have already been used clinically as a scaffold for bone regeneration. OCP can be used as an effective scaffold for growth factors, such as bone morphogenetic protein-2 (BMP-2) and transforming growth factor-β1 (TGF-β1), to enhance bone regeneration. Although OCP possesses many desirable properties, OCP cannot be molded by a sintering process, unlike bioceramics, such as HA or β-TCP. To improve the performance of bone regeneration and handling performance, a composite synthetic bone substitute constructed of synthetic OCP and porcine atelocollagen sponge (OCP/Col) has been developed. The synergistic effects of OCP/Col on bone regeneration are the result of bone nucleation by OCP and cell infiltration by collagen, and OCP/Col shows stable bone regeneration. OCP/Col significantly enhances bone regeneration more than OCP per se, β-TCP collagen composite, and HA collagen composite if implanted into a critical-sized defect model in a rat calvarium. During optimization of OCP/Col, it was confirmed that bone regeneration by OCP/Col was influenced by dehydrothermal treatment in the fabrication of OCP/Col or the composition of OCP and collagen. As OCP/Col is applicable without cell transplantation and exogenous osteogenic cytokines, costeffective bone regenerative therapy is expected in the future..
2. Osamu Suzuki, Takahisa Anada, Bone related cell-stimulating scaffold materials and a 3D cellular construct for hard tissue regeneration, Springer Japan, 10.1007/978-4-431-55297-0_16, 261-273, 2015.01, The present article summarizes recently developed calcium phosphatebased scaffold materials that are capable of stimulating various cells involved in hard tissue formation as well as a method using newly developed cell culture devices to generate three dimensional (3D) cellular constructs. Synthetic octacalcium phosphate stimulates cellular functions of several cell types, including osteoblasts, chondrocytes, and pulp cells. The culture device promotes the easy assembly of chondrocytes in a 3D cellular construct. The scaffold materials, cellular constructs, and composite presented here are good candidates as implantable materials for the regeneration of hard tissue in bone defects depending on the severity of the tissue loss..