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Immunocytochemical Localization of Osteocalcin in Developing Rat Teeth
- Source :
- Journal of Dental Research. 66:784-790
- Publication Year :
- 1987
- Publisher :
- SAGE Publications, 1987.
-
Abstract
- Osteocalcin was purified by gel chromatography from a crude extract obtained after decalcification of rat incisors. The apparent molecular weight, as determined by 5-15% SDS-polyacrylamide gel electrophoresis, was 18,000, and amino acid analysis revealed 60 γ-carboxyglutamic acid residues per 1000. Antisera against osteocalcin, raised in rabbits, reacted specifically with osteocalcin when investigated by immuno-electroblotting of dentin crude extract. 4-μm cryosections of formaldehyde-fixed tooth germs showed positive immunocytochemical staining for osteocalcin in dentin and odontoblasts. The staining of the mantle dentin at the coronal sides of the tooth germs was more intense than that of the adjacent circumpulpal dentin, while the odontoblasts involved in the formation of mantle dentin showed stronger immunoreactivity than did odontoblasts involved in circumpulpal dentin formation. This marked difference was not observed on the root sides of the tooth germs. In 1-μm cryosections, osteocalcin immunoreactivity was found evenly distributed throughout the entire cell body, with the exception of the Golgi region, which was less intensely stained, while the nucleus and the cell process were negative. The positive staining reaction with anti-osteocalcin antiserum was found in dentin from the very onset of its formation in the fetus. ln conclusion, our results demonstrate the presence of osteocalcin in odontoblasts and dentin. Its immunocytochemical localization may be compatible with a distinct role in early dentinogenesis.
- Subjects :
- Male
Paper
0301 basic medicine
Osteocalcin
Enzyme-Linked Immunosorbent Assay
Chromatography, DEAE-Cellulose
Immunocytochemical staining
03 medical and health sciences
0302 clinical medicine
stomatognathic system
Dentin
medicine
Animals
General Dentistry
Tooth Germs
Gel electrophoresis
Odontoblasts
biology
Bone decalcification
Chemistry
Calcium-Binding Proteins
Collodion
Sodium Dodecyl Sulfate
Tooth Germ
Rats, Inbred Strains
030206 dentistry
Molecular biology
Rats
Staining
stomatognathic diseases
030104 developmental biology
medicine.anatomical_structure
Odontoblast
Biochemistry
biology.protein
Electrophoresis, Polyacrylamide Gel
Subjects
Details
- ISSN :
- 15440591 and 00220345
- Volume :
- 66
- Database :
- OpenAIRE
- Journal :
- Journal of Dental Research
- Accession number :
- edsair.doi.dedup.....04158258447e8e5476a4b79586386bee
- Full Text :
- https://doi.org/10.1177/00220345870660031601