title: DSPP effects on in vivo bone mineralization.
abstract: Dentin sialophosphoprotein has been implicated in the mineralization process based on the defective dentin formation in Dspp null mice (Dspp-/-). Dspp is expressed at low levels in bone and Dspp-/- femurs assessed by quantitative micro-computed tomography (micro-CT) and Fourier transform infrared spectroscopic imaging (FTIRI) exhibit some mineral and matrix property differences from wildtype femurs in both developing and mature mice. Compared to wildtype, Dspp-/- mice initially (5 weeks) and at 7 months had significantly higher trabecular bone volume fractions and lower trabecular separation, while at 9 months, bone volume fraction and trabecular number were lower. Cortical bone mineral density, area, and moments of inertia in Dspp-/- were reduced at 9 months. By FTIRI, Dspp-/- animals initially (5 months) contained more stoichiometric bone apatite with higher crystallinity (crystal size/perfection) and lower carbonate substitution. This difference progressively reversed with age (significantly decreased crystallinity and increased acid phosphate content in Dspp-/- cortical bone by 9 months of age). Mineral density as determined in 3D micro-CT and mineral-to-matrix ratios as determined by 2D FTIRI in individual cortical and trabecular bones were correlated (r(2)=0.6, p<0.04). From the matrix analysis, the collagen maturity of both cortical and trabecular bones was greater in Dspp-/- than controls at 5 weeks; by 9 months this difference in cross-linking pattern did not exist. Variations in mineral and matrix properties observed at different ages are attributable, in part, to the ability of the Dspp gene products to regulate both initial mineralization and remodeling, implying an effect of Dspp on bone turnover.
authors.affiliation: Mineralized Tissue Laboratory, Musculoskeletal Integrity Program, Hospital for Special Surgery, New York, NY 10021, USA.
authors.forename: Kostas
authors.initials: K
authors.lastname: Verdelis
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Ling
authors.forename: Taduru
authors.initials: T
authors.lastname: Sreenath
authors.forename: Naoto
authors.initials: N
authors.lastname: Haruyama
authors.forename: Mary
authors.initials: M
authors.lastname: MacDougall
authors.forename: Marjolein C H
authors.initials: MC
authors.lastname: van der Meulen
authors.forename: Lyudmila
authors.initials: L
authors.lastname: Lukashova
authors.forename: Lyudmila
authors.initials: L
authors.lastname: Spevak
authors.forename: Ashok B
authors.initials: AB
authors.lastname: Kulkarni
authors.forename: Adele L
authors.initials: AL
authors.lastname: Boskey
mesh_terms: D000818:Animals; D015519:Bone Density; D002113:Calcification, Physiologic / Q000502:physiology*; D016326:Extracellular Matrix Proteins; D051379:Mice; D018345:Mice, Knockout; D010750:Phosphoproteins; D011498:Protein Precursors / Q000235:genetics / Q000502:physiology*; D012795:Sialoglycoproteins; D017550:Spectroscopy, Fourier Transform Infrared; D014057:Tomography, X-Ray Computed; D000099311:Dentin Sialophosphoprotein
chemical_list: D016326:Extracellular Matrix Proteins; D010750:Phosphoproteins; D011498:Protein Precursors; D012795:Sialoglycoproteins; D000099311:Dentin Sialophosphoprotein
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