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- Title
Studies of osteocalcin function in dentin formation in rodent teeth.
- Authors
Bronckers, A.L.J.J.; Price, P.A.; Schrijvers, A.; Bervoets, T.J.M.; Karsenty, G.
- Abstract
Osteoclacin (OC) is a major non-collagenous protein synthesized by osteoblasts, odontoblasts and cementoblasts. We examined the function of OC in dentinogenesis by exposing rat and hamster tooth organ cultures to 1.25(OH)[sub2]vit D[sub3] or to bovine OC added to the culture medium. We furthermore examined dentinogenesis in tooth explants cultured in the presence of warfarin (an inhibitor of gamma-carboxylation of OC). Finally, we analyzed dentin from osteocalcin null mutant mice. Exposure to 1.25(OH)[sub2]vit D[sub3] increased OC synthesis by odontoblasts in vitro at the transcriptional and protein levels but had no apparent effect on matrix formation or [sup45]Ca uptake. High levels of bovine OC temporarily suppressed the initial formation of dentin and enamel and uptake of [sup45]Ca. This effect was not seen when tooth explants were exposed to thermally decarboxylated OC. Exposure of tooth explants to warfarin had no significant effect on dentinogenesis. Dentin obtained from two-month-old of null mutants looked structurally normal and did not show marked differences in dentin matrix thickness and mineral content compared to wild type. We concluded that, although OC at supraphysiological levels has the potential to affect dentin mineralization probably through its Gla-residues, the locally produced levels of OC are not sufficient to markedly influence dentinogenesis.
- Subjects
DENTIN; DENTAL care; TOOTH transplantation; DENTAL enamel
- Publication
European Journal of Oral Sciences, 1998, Vol 106, Issue 3, p795
- ISSN
0909-8836
- Publication type
Article
- DOI
10.1046/j.0909-8836.1998.eos106306.x