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The expression pattern of hyaluronan synthase during human tooth development.

Sz Felszeghy1, Z Mészár, P Prehm

  • 1Department of Anatomy, Histology and Embryology, University of Debrecen, Medical and Health Science Centre, Debrecen, Nagyerdei krt. 98. H-4012, Hungary. szabi@chondron.anat.dote.hu

Archives of Oral Biology
|February 22, 2005
PubMed
Summary

Hyaluronan synthases (HASs) are crucial for tooth development, synthesizing hyaluronan (HA) in various dental cells. This study mapped HAS expression in human tooth germs, revealing its role in morphogenesis and hard tissue formation.

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Area of Science:

  • Developmental Biology
  • Oral Biology
  • Biochemistry

Background:

  • Hyaluronan (HA) and its receptor CD44 are implicated in tooth development.
  • Hyaluronan synthases (HASs) produce HA, but their expression during odontogenesis is largely unknown.

Purpose of the Study:

  • To investigate the localization and expression patterns of HAS during human tooth germ development.
  • To correlate HAS distribution with hyaluronan localization and potential roles in tooth morphogenesis and mineralization.

Main Methods:

  • Immunohistochemistry was employed to detect HAS expression in human tooth germs across various developmental stages.
  • Localization of HAS immunoreactivity was analyzed in different dental tissues, including dental lamina, enamel epithelium, stellate reticulum, odontoblasts, ameloblasts, and pulpal cells.

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Main Results:

  • HAS expression was observed in dental lamina, inner/outer enamel epithelium, and stellate reticulum during the bell stage.
  • Strong HAS immunoreactivity was detected in odontoblasts, secretory ameloblasts, and pulpal mesenchymal cells during early mineralization.
  • HAS signals in odontoblasts and ameloblasts decreased with advancing age.

Conclusions:

  • Hyaluronan is synthesized locally by various dental cells, as indicated by HAS expression patterns.
  • These findings support the role of HA in regulating tooth morphogenesis and the formation of dental hard tissues.