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Timing of odontogenic neural crest cell migration and tooth‐forming capability in mice
Author(s) -
Zhang Yanding,
Wang Shusheng,
Song Yiqiang,
Han Jun,
Chai Yang,
Chen YiPing
Publication year - 2003
Publication title -
developmental dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.634
H-Index - 141
eISSN - 1097-0177
pISSN - 1058-8388
DOI - 10.1002/dvdy.10274
Subject(s) - neural crest , biology , fgf8 , anatomy , somite , cranial neural crest , embryo , crest , microbiology and biotechnology , epithelium , embryogenesis , genetics , fibroblast growth factor , receptor , physics , quantum mechanics
The mammalian tooth develops through sequential and reciprocal interactions between cranial neural crest (CNC)‐ derived ectomesenchymal cells and the stomadial epithelium. Classic tissue recombination studies demonstrated that premigratory CNC cells and CNC‐derived ectomesenchymal cells possess odontogenic capacity and can respond to oral epithelial signals to form a tooth, suggesting that the CNC cells contributing to odontogenic tissue are not prespecified. Here we show that, in mice, CNC cells have populated the forming first branchial arch before the 9‐somite stage and continue to migrate into the arch by the 13‐somite stage. Grafts of the first arch from the 10‐somite embryo or earlier yielded membranous bone and cysts but no teeth after subrenal culture. However, grafts of the first arch with its dorsally adjacent tissue containing migrating neural crest cells from the same age embryos gave rise to teeth. In contrast, teeth formed in first arch grafts that do not contain migrating neural crest cells from embryos with 12 or more somites. Interestingly, the acquisition of tooth forming capability in the first arch coincides with the onset of Fgf8 expression in the oral epithelium. These results suggest that there exists a population of odontogenic neural crest cells that migrates into the first arch between the 10‐ and 12‐somite stages. These cells either possess odontogenic potential and are able to initiate tooth development, or can respond to odontogenic signals derived from the oral epithelium to support tooth formation. Developmental Dynamics, 2003. © 2003 Wiley‐Liss, Inc.