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Developmental expression of a 53 KD dentin sialoprotein in rat tooth organs
RN D'Souza, AL Bronckers, RP Happonen, DA Doga, MC Farach-Carson and WT Butler
Department of Anatomical Sciences, University of Texas Health Science Center, Houston 77030.
Rat dentin contains a major sialic acid-rich glycoprotein, DSP, with an overall composition similar to that of bone sialoproteins but whose biological role in dentinogenesis is unknown. Using polyclonal affinity- purified antibodies to rat DSP and four immunohistochemical methods of detection, we studied the cell and tissue localization of DSP and the time course of its appearance during odontoblast differentiation. DSP first appeared within young odontoblasts concomitant with early secretion of pre-dentin matrix and before the onset of mineralization but was absent in pre-odontoblasts. DSP immunostaining also localized within secretory odontoblasts and was intense in odontoblastic processes. Early pre-dentin stained positive for DSP, in contrast to more mature pre-dentin, where immunoreactivity was less intense and more restricted to odontoblastic processes. In the zone of mineralized dentin matrix, a moderate and uniform staining pattern was evident. Intense immunostaining was also seen within the cells and matrix of dental pulp during dentinogenesis. Other cells and tissues within the tooth organ and those surrounding it were non-reactive. These findings suggest that DSP is developmentally expressed in cells of the odontoblastic lineage and may be a biochemical marker of odontoblastic activity.
Volume 40,
Issue 3,
pp. 359-366,
03/01/1992
Copyright © 1992 by The Histochemical Society
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