title: The induction of enamel and dentin complexes by subcutaneous implantation of reconstructed human and murine tooth germ elements.
abstract: Tooth induction by xenogenic graft of reconstructed human tooth germ components has never been attempted. Here we report our first attempt at a transplantation of human tooth germ components, heterologously recombined with mouse dental epithelia, into immunocompromised animals. Human third molar tooth germs enucleated from young patients as prophylactic treatment for orthodontic reasons were collected. The whole or minced human dental papilla was reconstructed with human- or mouse molar enamel epithelium, and transplanted in the dorsal aspect of C.B-17/Icr-scid Jcl mice. The transplant of human dental papilla reconstructed with human enamel epithelium formed thin dentin and immature enamel layers by 3 to 4 weeks, but remained extremely small in quantity due to a shortage of epithelial components in the graft. The addition of E16 mouse molar enamel organs (n=10-12) to each graft augmented the formation of tooth germ-like structures, but the differentiation of mouse molar ameloblasts was suppressed. However, once a solid layer of mineralized dentin was established, mouse ameloblasts accelerated their differentiation, and completed the enamel matrix formation and maturation within the following 4 weeks, whereas human ameloblasts, which had interacted with human dental papilla, remained in the stage of matrix formation during the same period. These data imply that, in reconstructed transplants, the differentiation of mouse dental epithelia is restrained by putative suppressive factors derived from human dental papilla until they are separated by mineralized dentin layers that serve as a diffusion barrier. The mouse enamel organ nevertheless retains its own phenotypic characteristics and intrinsic timing of cell differentiation and function.
authors.affiliation: Department of Developmental Oral Health Science, Graduate School of Tokyo Medical and Dental University, Japan.
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Isogawa
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Terashima
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Nakano
authors.forename: Junko
authors.initials: J
authors.lastname: Kindaichi
authors.forename: Yuzo
authors.initials: Y
authors.lastname: Takagi
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Takano
mesh_terms: D053523:Amelogenin; D000818:Animals; D002454:Cell Differentiation; D002455:Cell Division; D002648:Child; D003743:Dental Enamel / Q000166:cytology / Q000254:growth & development*; D003746:Dental Enamel Proteins / Q000032:analysis; D003771:Dental Papilla / Q000166:cytology / Q000254:growth & development / Q000637:transplantation*; D003804:Dentin / Q000166:cytology / Q000254:growth & development*; D004847:Epithelial Cells / Q000737:chemistry / Q000166:cytology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D016513:Mice, SCID; D008928:Mitochondria; D009805:Odontogenesis; D011247:Pregnancy; D014183:Transplantation, Heterologous
chemical_list: D053523:Amelogenin; C507200:Amelx protein, mouse; D003746:Dental Enamel Proteins