Abstract
Dentin matrix protein 1 (DMP1) and dentin sialophosphoprotein (DSPP) are essential for the formation of dentin. Previous in vitro studies have indicated that DMP1 might regulate the expression of DSPP during dentinogenesis. To examine whether DMP1 controls dentinogenesis through the regulation of DSPP in vivo, we cross-bred transgenic mice expressing normal DSPP driven by a 3.6-kb rat Col1a1 promoter with Dmp1 KO mice to generate mice expressing the DSPP transgene in the Dmp1 KO genetic background (referred to as "Dmp1 KO/DSPP Tg mice"). We used morphological, histological, and biochemical techniques to characterize the dentin and alveolar bone of Dmp1 KO/DSPP Tg mice compared with Dmp1 KO and wild-type mice. Our analyses showed that the expression of endogenous DSPP was remarkably reduced in the Dmp1 KO mice. Furthermore, the transgenic expression of DSPP rescued the tooth and alveolar bone defects of the Dmp1 KO mice. In addition, our in vitro analyses showed that DMP1 and its 57-kDa C-terminal fragment significantly up-regulated the Dspp promoter activities in a mesenchymal cell line. In contrast, the expression of DMP1 was not altered in the Dspp KO mice. These results provide strong evidence that DSPP is a downstream effector molecule that mediates the roles of DMP1 in dentinogenesis.
Publication types
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Research Support, N.I.H., Extramural
MeSH terms
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Animals
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Biglycan / genetics
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Biglycan / metabolism
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Cell Differentiation / genetics
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Collagen Type I / genetics
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Collagen Type I / metabolism
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Collagen Type I, alpha 1 Chain
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Dentinogenesis / genetics*
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Extracellular Matrix Proteins / deficiency
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Extracellular Matrix Proteins / genetics*
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Extracellular Matrix Proteins / metabolism
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Gene Expression Regulation, Developmental
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Homeodomain Proteins / genetics
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Homeodomain Proteins / metabolism
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Immunohistochemistry
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Mandible / diagnostic imaging
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Mandible / growth & development
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Mandible / metabolism
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Mice
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Mice, Knockout
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Mice, Transgenic
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Odontoblasts / cytology
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Odontoblasts / metabolism
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Phosphoproteins / genetics*
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Phosphoproteins / metabolism
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Rats
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Reverse Transcriptase Polymerase Chain Reaction
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Sialoglycoproteins / genetics*
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Sialoglycoproteins / metabolism
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Tooth / diagnostic imaging
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Tooth / growth & development
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Tooth / metabolism
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Tooth Abnormalities / genetics*
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Transcription Factors / genetics
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Transcription Factors / metabolism
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X-Ray Microtomography
Substances
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Biglycan
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Collagen Type I
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Collagen Type I, alpha 1 Chain
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Distal-less homeobox proteins
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Dmp1 protein, mouse
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Extracellular Matrix Proteins
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Homeodomain Proteins
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Phosphoproteins
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Sialoglycoproteins
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Transcription Factors
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dentin sialophosphoprotein