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Bone sialoprotein.

B Ganss1, R H Kim, J Sodek

  • 1Medical Research Council Group in Periodontal Physiology, Faculty of Dentistry, University of Toronto, Ontario, Canada.

Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists
|April 12, 2000
PubMed
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It is time to move on.....

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Bone sialoprotein (BSP) is identified as a key protein nucleator for hydroxyapatite crystal formation in bone. Its unique properties and expression patterns suggest roles in mineralization and cell interactions.

Area of Science:

  • Biochemistry
  • Biomineralization
  • Cell Biology

Background:

  • Hydroxyapatite (HA) crystal formation in bone requires protein nucleators.
  • Bone sialoprotein (BSP) is a major non-collagenous protein in mineralized tissues.
  • BSP is a glycosylated, sulfated phosphoprotein with conserved functional motifs.

Purpose of the Study:

  • To characterize BSP as a potential nucleator of hydroxyapatite formation.
  • To investigate the role of BSP in bone mineralization and cell interactions.
  • To explore the bi-functional nature of BSP.

Main Methods:

  • Protein isolation and characterization.
  • Gene expression analysis.
  • Analysis of conserved motifs (polyglutamic acid, RGD).

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Main Results:

  • BSP exhibits properties consistent with a hydroxyapatite nucleator.
  • BSP expression is regulated during bone formation.
  • BSP contains motifs for HA binding and cell attachment (RGD).
  • BSP is implicated in pathological mineralization (e.g., breast carcinomas).

Conclusions:

  • BSP is a bona fide candidate for hydroxyapatite nucleation in bone.
  • BSP possesses bi-functional properties for mineralization and cell targeting.
  • Further research is needed to elucidate BSP's role in cell signaling and attachment.