J Korean Acad Conserv Dent.  2005 Sep;30(5):423-431.

Expression of OD314 during ameloblast differentiation and maturation

• Park JC
• Ahn SM
• Kim HJ
• Jeong MJ
• Park MJ
• Shin IC
• Son HH

Abstract

Ameloblasts are responsible for the formation and maintenance of enamel which is an epithelially derived protective covering for teeth. Ameloblast differentiation is controlled by sequential epithelial-mesenchymal interactions. However, little is known about the differentiation and maturation mechanisms. OD314 was firstly identified from odontoblasts by subtraction between odontoblast/pulp cells and osteoblast/dental papilla cells, even though OD314 protein was also expressed in ameloblast during tooth formation. In this study, to better understand the biological function of OD314 during amelogenesis, we examined expression of the OD314 mRNA and protein in various stages of ameloblast differentiation using in-situ hybridization and immunohistochemistry. The results were as follows : 1. The ameloblast showed 4 main morphological and functional stages referred to as the presecretory, secretory, smooth-ended, and ruffle-ended. 2. OD314 mRNA was expressed in secretory ameloblast and increased according to the maturation of the cells. 3. OD314 protein was not expressed in presecretory ameloblast but expressed in secretory ameloblast and maturative ameloblast. OD314 protein was distributed in entire cytoplasm of secretory ameloblast. However, OD314 was localized at the proxiamal and distal portion of the cytoplasm of smooth-ended and ruffle-ended ameloblast. These results suggest that OD314 may play important roles in the ameloblast differentiation and maturation.

Keyword

Ameloblast; OD314; Differentiation; Maturation; Smooth-ended; Ruffle-ended

MeSH Terms

Ameloblasts*
Amelogenesis
Cytoplasm
Dental Enamel
Immunohistochemistry
Odontoblasts
RNA, Messenger
Tooth
RNA, Messenger

Figure

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  Figure 1 The various functional stages of the ameloblast. Panel A, Ameloblast of presecretory stage; panel B, Ameloblast of secretory stage; panel C, Smooth-ended ameloblast of maturative stage; panel D, Ruffle-ended ameloblast of maturative stage.

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  Figure 2 Mandibular incisor of 3-week-old mouse hybridized with antisense cRNA probes of OD314. Panel A, Low magnification micrograph showing OD314 mRNA expression; panel B, High power view of zone I in panel A; panel C, High power view of zone II in panel A; panel D, High power view of zone III in panel A.

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  Figure 3 Immunohistochemical localization of OD314 in the various functional stages of ameloblast. Panel A, Ameloblast of presecretory stage; panel B, Ameloblast of secretory stage; panel C, Smooth-ended ameloblast of maturative stage; panel D, Ruffle-ended ameloblast of maturative stage.

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