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Odontoblasts and osteoblasts synthesize gamma-carboxyglutamatic acid (Gla)-containing proteins which are partially deposited in the mineralizing tissues and partially released into the plasma. Using four immunostaining techniques, we have evaluated the question of whether dentin Gla proteins (DGP) are transported to the mineralization front through the odontoblast processes. Undecalcified sections of rat incisors and molar tooth germs were immunostained with affinity-purified antibodies to DGP using the following methods: indirect immunofluorescence; peroxidase-antiperoxidase (PAP); avidin-biotin-peroxidase complex (ABC-peroxidase); and avidin-biotin-gold complex with silver enhancement (ABC-GSS). The results obtained with these four procedures were compared with respect to the developmental appearance of DGP, staining intensity and presence in odontoblastic processes, predentin, dentin, and blood vessels. Qualitatively, similar results were obtained with the four, with respect to the distribution and developmental appearance of DGP, with two exceptions: indirect immunofluorescence never stained DGP within blood vessels, whereas the other methods occasionally did; and because of its sensitivity, only the ABC-GSS method revealed immunostaining for DGP in odontoblastic processes. All methods revealed weak immunostaining in predentin which was considerably enhanced with hyaluronidase treatment; however, hyaluronidase only moderately increased predentin immunostaining with ABC-GSS. Of these four procedures, ABC-GSS is the most sensitive; however, ABC-GSS appears to detect predominantly antigens at the surface of tissue sections. We conclude that DGP is present in odontoblastic processes but in low amounts; the weak staining was due either to rapid transport of DGP through the process or to the fact that this mode of transport is limited.

journal of histochemistry and cytochemistry/the journal of histochemistry and cytochemistry

Immunolocalization of Gla proteins (osteocalcin) in rat tooth germs: comparison between indirect immunofluorescence, peroxidase-antiperoxidase, avidin-biotin-peroxidase complex, and avidin-biotin-gold complex with silver enhancement.