J. Biochem, 2001, Vol. 129, No. 1 163-171
© 2001 Japanese Biochemical Society
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Geometric Effect of Matrix upon Cell Differentiation: BMP-Induced Osteogenesis Using a New Bioglass with a Feasible Structure1
*Department of Oral Health Science, Hokkaido University N-13, W-7, Kita-ku, Sapporo 060-8586
Department of Oral Pathobiology, Graduate School of Dentistry, Hokkaido University N-13, W-7, Kita-ku, Sapporo 060-8586
Department of Chiba Institute of Technology 17-1, Tsudanuma, 2-chome, Narashino, Chiba 275
2To whom correspondence should be addressed. Phone: +81-11-706-4231, Fax: +81-11-706-4877, E-mail: kuboki{at}den.hokudai.ac.jp
A new biocompatible glass, which is composed of CaO, P2O5, SiO2, and Al2O3 (abbreviated CPSA) and is characterized by higher elasticity than previous bioglass products, was molded into fibers with a diameter of 9 µm. With CPSA fibers, two geometrically different structures, balls and bundles (each 20 mg in weight), were prepared, combined with 2.2 µg of rhBMP-2 (a gift from Yamanouchi Co., Japan) and implanted subcutaneously into rats. The histology showed remarkably higher bone formation in the ball-CPSA/ BMP at 2 and 4 weeks than in the bundle-CPSA/BMP. The ball-CPSA/BMP showed 10 times higher alkaline phosphatase (ALP) activity at the second week and 5 times higher osteocalcin content at the fourth week than the bundle-CSPA/BMP. Vascular development in the implants was evaluated by mRNA expression of Flt-1 and KDR, two receptors for vascular endothelial growth factor (VEGF). Both receptors showed higher expression in the case of the ball, while they were not detected in the bundle. It is concluded that the BMP-induced bone formation depends highly upon the porous vasculature-inducing geometry of the matrix, which can be constructed with the new CPSA fibers.
1This study was supported in part by Grants-in-Aid (Nos. 04557078, 05454495, 06557095, 07457437, and 08557096) from the Ministry of Education, Science, Sports and Culture of Japan.
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