Genetic evidence for key roles of decorin and biglycan in dentin mineralization

Naoto Haruyama, Taduru L. Sreenath, Shigeki Suzuki, Xiaomei Yao, Zhigang Wang, Yong Wang, Cherlita Honeycutt, Renato V. Iozzo, Marian F. Young, Ashok B. Kulkarni

研究成果: Contribution to journalArticle査読

38 被引用数 (Scopus)


Targeted disruption of the dentin sialophosphoprotein (DSPP) gene in the mice (Dspp-/-) results in dentin mineralization defects with enlarged predentin phenotype similar to human dentinogenesis imperfecta type III. Using DSPP/biglycan (Dspp-/-Bgn-/0) and DSPP/decorin (Dspp-/-Dcn-/-) double knockout mice, here we determined that the enlarged predentin layer in Dspp-/- teeth is rescued in the absence of decorin, but not in the absence of biglycan. However, Fourier transform infrared (FTIR) spectroscopy analysis reveals similar hypomineralization of dentin in both Dspp-/-Bgn-/0 and Dspp-/-Dcn-/- teeth. Atomic force microscopy (AFM) analysis of collagen fibrils in dentin shows subtle differences in the collagen fibril morphology in these genotypes. The reduction of enlarged predentin in Dspp-/-Dcn-/- mice suggests that the elevated level of decorin in Dspp-/- predentin interferes with the mineralization process at the dentin mineralization front. On the other hand, the lack of DSPP and biglycan leads to the increased number of calcospherites in Dspp-/-Bgn-/0 predentin, suggesting that a failure in coalescence of calcospherites was augmented in Dspp-/-Bgn-/0 teeth as compared to Dspp-/- teeth. These findings indicate that normal expression of small leucine rich proteoglycans, such as biglycan and decorin, plays an important role in the highly orchestrated process of dentin mineralization.

ジャーナルMatrix Biology
出版ステータス出版済み - 4 2009

All Science Journal Classification (ASJC) codes

  • 分子生物学


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