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Proteoglycans in dentinogenesis.

G Embery1, R Hall, R Waddington

  • 1Department of Basic Dental Science, Dental School, University of Wales College of Medicine, Cardiff, UK. g.embery@liverpool.ac.uk

Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists
|October 18, 2001
PubMed
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Small leucine-rich proteoglycans like decorin and biglycan are crucial for dentin formation. Their gradients in predentin may organize collagen for mineralization and phosphoprotein binding, aiding calcium incorporation.

Area of Science:

  • Biochemistry
  • Mineralization Biology
  • Connective Tissue Research

Background:

  • Predentin and dentin contain specific proteoglycans: chondroitin-sulphate-rich (decorin, biglycan) and keratan-sulphate-rich (lumican, fibromodulin).
  • These small, interstitial, leucine-rich proteoglycans (SLRPs) exhibit gradients within predentin.

Purpose of the Study:

  • To investigate the spatial distribution of proteoglycans in predentin.
  • To explore the role of proteoglycan gradients in collagen network organization and biomineralization.

Main Methods:

  • Biochemical analysis
  • Autoradiography
  • Immunohistochemistry using specific antibodies (anti-chondroitin sulphate, anti-keratan sulphate, anti-decorin)

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Main Results:

  • Chondroitin sulphate shows a decreasing gradient from pulp to mineralizing front; keratan sulphate shows the converse.
  • Decorin increases towards the mineralizing front.
  • Metalloproteinase gradients may drive these proteoglycan changes.

Conclusions:

  • Proteoglycan gradients in predentin may organize the collagen matrix for phosphoprotein and phospholipid incorporation.
  • Glycosaminoglycan-depleted SLRP cores might act as binding sites for phosphoproteins.
  • The calcium-binding capacity of decorin and biglycan suggests a direct role in initiating dentin mineralization.