Proliferation and bone-related gene expression of osteoblasts grown on hydroxyapatite ceramics sintered at different temperature

• Published in: Biomaterials Vol. 25; no. 15; pp. 2949 - 2956
• Main Authors: Wang, Chaoyuan, Duan, Yourong, Markovic, Boban, Barbara, James, Rolfe Howlett, C., Zhang, Xingdong, Zreiqat, Hala
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Ltd 01.07.2004
• Subjects: Bone Substitutes - chemistry; Calcium-Binding Proteins - metabolism; Cell Differentiation; Cell Division; Cell Line; Cell proliferation; Cell Survival; Durapatite - chemistry; Durapatite - radiation effects; Gene expression; Gene Expression Regulation - physiology; Growth Substances - metabolism; Hot Temperature; Humans; Hydroxyapatite ceramics; mRNA; Osteoblasts - cytology; Osteoblasts - metabolism; Osteogenesis - physiology; Particle Size; Protein; Quantitative in situ hybridization; Surface Properties; Cell proliferation; mRNA; Gene expression; Hydroxyapatite ceramics; Quantitative in situ hybridization; Protein
• ISSN: 0142-9612; 1878-5905
• DOI: 10.1016/j.biomaterials.2003.09.088

Human osteoblast-like cells SaOS-2 (ATCC HTB85) were seeded onto three kinds of hydroxyapatite (HA) ceramics sintered at different temperature (1200°C, 1000°C and 800°C). Scanning electron microscopy (SEM) was conducted to detect the surface microstructure. Cells were cultured on these substrates for 6 and 12 days and cell proliferation rate and mRNA expression for osteocalcin, osteonectin, type I collagen and alkaline phosphatase and protein production for osteocalcin, bone sialoprotein and osteonectin were detected with quantitative in situ hybridization and immunocytochemistry techniques. SEM revealed that crystal particle size was affected by sintering temperature. Result showed that cell proliferation rate on HA ceramics sintered at 1200°C was the highest. Osteonectin and type I collagen mRNA expression was not altered by sintering temperature. After 12 days in culture, bone sialoprotein, osteocalcin and osteonectin proteins levels were significantly ( p<0.05) higher when SaOS-2 cells were cultured on HA sintered at 1200°C, compared to the other two surfaces, suggesting that HA sintered at high temperature may be a better candidate for in vivo implantation. This result provides valuable information concerning the clinic application of HA ceramics sintered at different temperature.