Nucleation of hydroxyapatite by bone sialoprotein.

作者：Graeme K. Hunter, Harvey A. Goldberg · 发表于：Proceedings of the National Academy of Sciences · 年份：1993 · DOI：10.1073/pnas.90.18.8562 · 被引用次数：664 · 研究领域：Bone and Dental Protein Studies、Bone Tissue Engineering Materials、Calcium Carbonate Crystallization and Inhibition

Bone sialoprotein (BSP) and osteopontin, the major phosphorylated proteins of mammalian bone, have been proposed to function in the initiation of mineralization. To test this hypothesis, the effects of BSP and osteopontin on hydroxyapatite crystal formation were determined by using a steady-state agarose gel system. At low calcium phosphate concentrations, no accumulation of calcium and phosphate occurred in control gels or gels containing osteopontin. Gels containing BSP at 1-5 micrograms/ml, however, exhibited a visible precipitation band and significantly elevated Ca + PO4 contents. By powder x-ray diffraction, the precipitate formed in the presence of BSP was shown to be hydroxyapatite. These findings suggest that bone sialoprotein may be involved in the nucleation of hydroxyapatite at the mineralization front of bone.