Dentin sialoprotein and dentin phosphoprotein have distinct roles in dentin mineralization.

Dentin sialoprotein and dentin phosphoprotein have distinct roles in dentin mineralization.
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DOI:
10.1016/j.matbio.2009.03.006
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发表时间:
2009-05
期刊:
影响因子:
6.9
通讯作者:
Kulkarni, Ashok B.
Kulkarni, Ashok B.
中科院分区:
生物学1区
文献类型:
--
作者:
Suzuki, Shigeki;Sreenath, Taduru;Haruyama, Naoto;Honeycutt, Cherlita;Terse, Anita;Cho, Andrew;Kohler, Thomas;Mueller, Ralph;Goldberg, Michel;Kulkarni, Ashok B.

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牙本质涎磷蛋白(DSPP)是成牙本质细胞的一种主要的非胶原基质蛋白,经蛋白水解后可分解为牙本质涎蛋白(DSP)和牙本质磷蛋白(DPP)。我们之前的研究表明,DSPP基因敲除小鼠表现出与人类常染色体显性牙本质发育不全症相似的表型,其中牙齿的前牙本质变宽,牙本质矿化不规则,导致牙本质中出现零星的未矿化区域和频繁的牙髓暴露。早期的体外研究表明,DPP,而不是DSP,在牙本质矿化的启动和成熟中起着重要作用。然而,DSP和DPP在体内的确切作用还远不清楚。在这里,我们报告了DPPcKO小鼠的产生,其中只有DSP在DSPP无效背景下表达,导致条件性DPP敲除。DPPcKO牙齿显示出DSPP无效表型的部分拯救,具有恢复的前牙本质宽度、牙本质中不存在不规则的未矿化区域以及较不频繁的牙髓暴露。DPPcKO磨牙的微型计算机断层扫描(micro-CT)分析进一步证实了这种部分挽救,牙本质体积显著恢复,但牙本质矿物质密度没有恢复。这些结果表明DSP和DPP在牙本质矿化中的不同作用,DSP调节牙本质矿化的起始,而DPP参与矿化牙本质的成熟。
Dentin sialophosphoprotein (DSPP), a major non-collagenous matrix protein of odontoblasts, is proteolytically cleaved into dentin sialoprotein (DSP) and dentin phosphoprotein (DPP). Our previous studies revealed that DSPP null mice display a phenotype similar to human autosomal dominant dentinogenesis imperfecta, in which teeth have widened predentin and irregular dentin mineralization resulting in sporadic unmineralized areas in dentin and frequent pulp exposure. Earlier in vitro studies suggested that DPP, but not DSP, plays a significant role in initiation and maturation of dentin mineralization. However, the precise in vivo roles of DSP and DPP are far from clear. Here we report the generation of DPPcKO mice, in which only DSP is expressed in a DSPP null background, resulting in a conditional DPP knockout. DPPcKO teeth show a partial rescue of the DSPP null phenotype with the restored predentin width, an absence of irregular unmineralized areas in dentin, and less frequent pulp exposure. Micro-computed tomography (micro-CT) analysis of DPPcKO molars further confirmed this partial rescue with a significant recovery in the dentin volume, but not in the dentin mineral density. These results indicate distinct roles of DSP and DPP in dentin mineralization, with DSP regulating initiation of dentin mineralization, and DPP being involved in the maturation of mineralized dentin.
DOI: 10.1111/j.1600-0722.1998.tb02177.x
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