Ameloblastin is a cell adhesion molecule required for maintaining the differentiation state of ameloblasts

Satoshi Fukumoto, Takayoshi Kiba, Bradford Hall, Noriyuki Iehara, Takashi Nakamura, Glenn Longenecker, Paul H. Krebsbach, Antonio Nanci, Ashok B. Kulkarni, Yoshihiko Yamada

研究成果: Contribution to journalArticle査読

272 被引用数 (Scopus)

抄録

Tooth morphogenesis results from reciprocal interactions between oral epithelium and ectomesenchyme culminating in the formation of mineralized tissues, enamel, and dentin. During this process, epithelial cells differentiate into enamel-secreting ameloblasts. Ameloblastin, an enamel matrix protein, is expressed by differentiating ameloblasts. Here, we report the creation of ameloblastin-null mice, which developed severe enamel hypoplasia. In mutant tooth, the dental epithelium differentiated into enamel-secreting ameloblasts, but the cells were detached from the matrix and subsequently lost cell polarity, resumed proliferation, and formed multicell layers. Expression of Msx2, p27, and p75 were deregulated in mutant ameloblasts, the phenotypes of which were reversed to undifferentiated epithelium. We found that recombinant ameloblastin adhered specifically to ameloblasts and inhibited cell proliferation. The mutant mice developed an odontogenic tumor of dental epithelium origin. Thus, ameloblastin is a cell adhesion molecule essential for amelogenesis, and it plays a role in maintaining the differentiation state of secretory stage ameloblasts by binding to ameloblasts and inhibiting proliferation.

本文言語英語
ページ(範囲)973-983
ページ数11
ジャーナルJournal of Cell Biology
167
5
DOI
出版ステータス出版済み - 12 5 2004

All Science Journal Classification (ASJC) codes

  • 細胞生物学

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