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Dentin sialoprotein (DSP) transcripts: developmentally‐sustained expression in odontoblasts and transient expression in pre‐ameloblasts
Author(s) -
Ritchie H. H.,
Berry J. E.,
Somerman M. J.,
Hanks C. T.,
Bronckers A. L. J. J.,
Hotton D.,
Papagerakis P.,
Berdal A.,
Butler W. T.
Publication year - 1997
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1997.tb02137.x
Subject(s) - odontoblast , ameloblast , dentin , in situ hybridization , dentinogenesis , cementoblast , pulp (tooth) , microbiology and biotechnology , anatomy , biology , bone sialoprotein , chemistry , pathology , messenger rna , enamel paint , cementum , dentistry , medicine , alkaline phosphatase , genetics , biochemistry , osteocalcin , gene , enzyme
Dentin sialoprotein (DSP), a 53 kDa glycoprotein, is believed to be present exclusively in dentin. Using rat and mouse digoxigenin labeled (DIG)‐DSP and 35 S‐DSP riboprobes, and in situ hybridization techniques, we have studied the presence of DSP mRNA at specific developmental stages of dentinogenesis. In mouse and rat molars and incisors, DSP transcripts were localized in young odontoblasts associated with early stages of predentin formation, as well as in mature odontoblasts, cells with cytoplasmic extensions embedded in the forming dentin. No DSP transcripts were detected in dental pulp, enamel organ, ameloblasts, epithelial root sheath, Meckel's cartilage, alveolar bone or tibia. Furthermore, no DSP mRNA was observed in other soft tissues including heart, lung, kidney, intestine, eye, and muscle. In addition to the intense and prolonged expression by odontoblasts, DSP mRNA was transiently expressed by pre‐ameloblasts in both developing molars and incisors. These observations are consistent with the results of previous immunohistochemical studies (1). The transient expression of DSP in pre‐ameloblasts across from young odontoblasts suggests an involvement of DSP in epithelial‐mesenchymal interactions that are crucial to later stages of tooth development.