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Related Experiment Videos

Expression of HMGB1 during tooth development.

R Sugars1, E Karlström, C Christersson

  • 1Center for Oral Biology, Novum, Karolinska Institutet, Huddinge, Sweden.

Cell and Tissue Research
|October 18, 2006
PubMed
Summary

High mobility group box 1 (HMGB1) protein is crucial for tooth development, with expression increasing significantly after birth. This suggests HMGB1 signaling is vital for dental mineralization and cell function.

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Area of Science:

  • Biochemistry
  • Developmental Biology
  • Cell Biology

Background:

  • High mobility group box 1 (HMGB1) is a versatile protein involved in various cellular processes.
  • Its role in tooth development, particularly during mineralization, remains largely unexplored.

Purpose of the Study:

  • To investigate the expression and localization of HMGB1 and its receptor, RAGE, during rat tooth development.
  • To explore the potential involvement of HMGB1 in tooth mineralization and odontoblast signaling.

Main Methods:

  • Light- and electron-microscopic immunohistochemistry to detect HMGB1 and RAGE protein expression in rat teeth.
  • Reverse transcription-polymerase chain reaction (RT-PCR) to analyze HMGB1 and RAGE mRNA in human dental pulp cells.
  • Immunoblotting to identify HMGB1 in bovine dentin extracts.

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Main Results:

  • Low HMGB1 expression was observed in fetal and newborn rat teeth, with a significant increase from postnatal day 5.
  • HMGB1 and RAGE were highly expressed in ameloblasts and odontoblasts during mineralization.
  • HMGB1 and RAGE mRNA were detected in human dental pulp cells, and HMGB1 protein was identified in bovine dentin.

Conclusions:

  • HMGB1 expression and localization suggest a critical role in tooth development and mineralization.
  • The presence of both HMGB1 and RAGE indicates an autocrine/paracrine signaling pathway in odontoblasts.
  • HMGB1 is implicated in the process of tooth mineralization.