Abstract
Gla-protein or osteocalcin is one of the most abundant noncollagenous matrix proteins found in bone and dentin. The present study describes, with high resolution, the intracellular and extracellular distribution of Gla-protein in alveolar bone and incisor dentin. Sections of tissues embedded in Lowicryl K4M were incubated with rabbit antibodies to rat dentin Gla-protein. The site of the specific antigen-antibody reaction was revealed by the protein A-gold complex. Labeling was detected over bone and dentin while fewer gold particles were present over prebone and predentin. Gold particles were also seen over the protein synthetic organelles (rough endoplasmic reticulum, Golgi apparatus) of osteoblasts and odontoblasts. These findings confirm, with improved resolution, previous light immunohistochemical studies, and offer the possibility to examine the secretory pathway of the protein.
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