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Expression of Bone Morphogenetic Proteins and Msx Genes during Root Formation

¹ Developmental Biology Program, Institute of Biotechnology, Viikki Biocenter, PO Box 56, FIN-00014 University of Helsinki, Finland;
² current address, Department of Orthodontics, Graduate School of Medicine and Dentistry, Okayama University, Shikata-cho 2-5-1, Okayama 700-8525, Japan;

View larger version (161K): [in a new window]   Figure 1. Sagittal section of molars in the lower jaw of a 14-day-old mouse. Histological appearance and keratin expression. (A) Hematoxylin and eosin staining. (B) Higher magnification of the distal root of 1st molar (inset in panel A). pod, pre-odontoblasts; eod, early odontoblast; od, odontoblasts; ce, cementoblasts; ob, osteoblasts. (C) Immunoreactivity to pan-keratin. Arrowhead indicates the epithelial cell rests of Malassez.

View larger version (204K): [in a new window]   Figure 2. Localization of Bmp2 (A,B), Bmp3 (C,D), Bmp4 (E,F), and Bmp7 (G,H) in the molars of a 14-day-old mouse. Panels B, D, F, and H are high-magnification views of the distal root of the 1st molar as shown in panels A, C, E, and F, respectively. Small arrowhead, large arrowhead, and arrow indicate expression in odontoblasts, cementoblasts, and osteoblasts, respectively. od, odontoblasts; ce, cementoblasts; ob, osteoblasts; am, ameloblasts, ers, epithelial root sheath.

View larger version (150K): [in a new window]   Figure 3. Localization of Msx1 (A,B), Msx2 (C,D), and Bsp (bone sialoprotein) (E,F) in the molars of a 14-day-old mouse. Panels B, D, and F are high-magnification views of the distal root of the 1st molar as shown in panels A, C, and E, respectively. pu, pulp; pdl, periodontal ligament; ab, alveolar bone; od, odontoblasts; ce, cementoblasts; ob, osteoblasts; am, ameloblasts; ers, epithelial root sheath. Large arrow, small arrow, and arrowhead indicate the expression in odontoblasts, cementoblasts, and Malassez epithelial cell rests, respectively.