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- W2034295608 abstract "We recently reported the presence of high concentrations of a Ca-binding matrix in the circumpulpal dentin of rat incisors which had been prevented from mineralization by a systemic administration of 1-hydroxyethylidene-1,1-bisphosphonate (HEBP), a type of bisphosphonates, thus suggesting the role of the putative Ca-binding matrix in the appositional mineralization of circumpulpal dentin (TAKANO et al., 1998, 2000; OHMA et al., 2000). In this study, we examined the distribution of Ca-binding domains in the pulp tissue of normal rat teeth and its changes under the influence of HEBP, in order to identify and clarify the role of the Ca-binding matrix in the physiological process of dentin mineralization. Observation of the normal rat tooth pulp showed occasional, tiny extracellular deposits of Ca-enriched material in the odontoblast layer, associated primarily with pericapillary regions. Such deposits were immunopositive for dentin sialoprotein (DSP), displayed high levels of X-ray peaks for calcium and phosphorus, and showed a drastic increase in amount by daily injections of HEBP. A brief vascular perfusion of high Ca-containing solution in normal animals caused the extensive deposition of Ca-P complexes along the basolateral membranes of odontoblasts but not in the other regions of the pulp tissue. These data suggest the existence of DSP-enriched extracellular Ca-binding domains in the odontoblast layer and also indicate a novel Ca-binding property of the basolateral membranes of odontoblasts. Since DSP is primarily synthesized as dentin sialophosphoprotein (DSPP) and later cleaved into dentin phosphophoryn (DPP) and DSP in odontoblasts, and since DSP has no notable affinity for Ca, the sites of DSP-immunopositive Ca-P deposits in the odontoblast layer may also contain DPP, a highly phosphorylated acidic protein having a strong binding property for calcium. Characteristic Ca-binding properties seen in the odontoblast layer appear to be related to the regulation of the appositional mineralization of circumpulpal dentin." @default.
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- W2034295608 date "2002-01-01" @default.
- W2034295608 modified "2023-09-23" @default.
- W2034295608 title "Ca-binding Domains in the Odontoblast Layer of Rat Molars and Incisors under Normal and Pathological Conditions." @default.
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- W2034295608 doi "https://doi.org/10.1679/aohc.65.337" @default.
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