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Calbindin-D 28K Localization in Rat Molars During Odontogenesis
T.N. Elms
Department of Anatomy, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, Texas 75246
A.N. Taylor
Department of Anatomy, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, Texas 75246
Specific antiserum raised against Calbindin-D28K, a vitamin D-dependent calcium-binding protein (CaBP) isolated from chick intestine, was used for localization of the protein in developing rat molars. Previously, CaBP had been localized in specific cells associated with the continuously erupting rat incisor: late pre-secretory ameloblasts, secretory and maturation zone ameloblasts, stratum intermedium cells adjacent to ameloblasts in the late zone of enamel secretion, and papillary cells underlying maturation zone ameloblasts. In this study, the peroxidase anti-peroxidase technique was used for localization of CaBP in histological sections of rat mandibles from 18-day-old rat embryos through 20-day-old neonates. CaBP was not detected in any cells of the enamel organ, dental papilla, or dental sac during early odontogenesis from the dental lamina stage through the advanced bell stage. The protein first appeared in secretory ameloblasts which were situated opposite odontoblasts with newly secreted dentin. CaBP was present in the cytoplasm of more mature ameloblasts, but not in less mature ameloblasts. Some stratum intermedium cells subjacent to well-developed secretory and maturation zone ameloblasts also contained CaBP. The protein was not detected in odontoblasts, pulp cells, or other cells associated with the developing molars. It was also absent from the demineralized enamel and dentin matrix. In developing rat molars, the time-course of appearance of CaBP, a protein dependent for its synthesis on the vitamin D endocrine system in other organ systems, suggests a potential direct role of this hormonal system in enamel mineralization.
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Journal of Dental Research, Vol. 66, No. 9,
1431-1434 (1987)
DOI: 10.1177/00220345870660090401
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