title: Transient amorphous calcium phosphate in forming enamel.
abstract: Enamel, the hardest tissue in the body, begins as a three-dimensional network of nanometer size mineral particles, suspended in a protein gel. This mineral network serves as a template for mature enamel formation. To further understand the mechanisms of enamel formation we characterized the forming enamel mineral at an early secretory stage using X-ray absorption near-edge structure (XANES) spectromicroscopy, transmission electron microscopy (TEM), FTIR microspectroscopy and polarized light microscopy. We show that the newly formed enamel mineral is amorphous calcium phosphate (ACP), which eventually transforms into apatitic crystals. Interestingly, the size, shape and spatial organization of these amorphous mineral particles and older crystals are essentially the same, indicating that the mineral morphology and organization in enamel is determined prior to its crystallization. Mineralization via transient amorphous phases has been previously reported in chiton teeth, mollusk shells, echinoderm spicules and spines, and recent reports strongly suggest the presence of transient amorphous mineral in forming vertebrate bones. The present finding of transient ACP in murine tooth enamel suggests that this strategy might be universal.
authors.affiliation: University of Pittsburgh School of Dental Medicine, Department of Oral Biology, Pittsburgh, PA 15261, USA. ebeniash@dental.pitt.edu
authors.forename: Elia
authors.initials: E
authors.lastname: Beniash
authors.forename: Rebecca A
authors.initials: RA
authors.lastname: Metzler
authors.forename: Raymond S K
authors.initials: RS
authors.lastname: Lam
authors.forename: P U P A
authors.initials: PU
authors.lastname: Gilbert
mesh_terms: D002130:Calcium Phosphates / Q000737:chemistry*; D003743:Dental Enamel / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D002130:Calcium Phosphates; C519480:amorphous calcium phosphate