Raman spectroscopic evidence for octacalcium phosphate and other transient mineral species deposited during intramembranous mineralization

Bone
Nicole CraneMichael A Ignelzi

Abstract

To understand early mineralization events, we studied living murine calvarial tissue by Raman spectroscopy using fibroblast growth factor 2 (FGF2)-soaked porous beads. We detected increased levels of a transient phase resembling octacalcium phosphate in sutures undergoing premature suture closure. Several calcium phosphates have been postulated as the earliest inorganic precursors to bone mineral. They are unstable and have not been previously detected in tissue specimens. Whether the same intermediates are formed in sutures undergoing premature closure is also unknown. Six coronal suture tissue specimens from fetal day 18.5 B6CBA F1/J wild-type mice were studied. Three sutures specimens were treated with FGF2-soaked heparin acrylic beads to induce accelerated mineralization and premature suture closure. Three control specimens were treated with empty heparin acrylic beads. All sutures were maintained as organ cultures to permit repeated spectral analyses at 12-24 h intervals over a 72-h period. During the first 24 h, the spectra contained bands of octacalcium phosphate (OCP) or an OCP-like mineral. The main phosphorus-oxygen stretch was at 955 cm(-1), instead of the 957-959 cm(-1) seen in bone mineral, and there was an additio...Continue Reading

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