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Expression of HMGB1 during tooth development
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Journal Article
Expression of HMGB1 during tooth development
2007
Overview
High mobility group box 1 (HMGB1) is a nuclear and cytosolic protein that can act as a transcription factor, a growth factor, or a cytokine. To elucidate a possible role for HMGB1 in tooth development, we have studied the expression of HMGB1 and its receptor RAGE (receptor for advanced glycation end-products) during the late fetal and early postnatal period of rat by using light- and electron-microscopic immunohistochemistry. Low HMGB1 protein expression was observed during fetal and newborn stages of tooth development. However, from postnatal day 5 (P5) onward, a marked increase occurred in the levels of the protein in most dental cell types. Expression was particularly high in ameloblasts and odontoblasts at regions of ongoing mineralization. Although most HMGB1 immunoreactivity was confined to cell nuclei, it was also present in odontoblast cytoplasm. At P5, ameloblasts and odontoblasts also showed RAGE immunoreactivity, and reverse transcription-polymerase chain reaction demonstrated both HMGB1 and RAGE mRNA in human dental pulp cells in vitro. Immunoblots performed on extracts from bovine dentin demonstrated a principal band at approximately 27 kDa, indicating that HMGB1 participates in tooth mineralization. The expression of both ligand and receptor suggests an autocrine/paracrine HMGB1 signalling axis in odontoblasts.
Publisher
Springer Nature B.V
Subject
/ Ameloblasts - ultrastructure
/ Animals
/ Animals, Newborn - growth & development
/ Cell Differentiation - drug effects
/ Dental Pulp - growth & development
/ Fetal Development - physiology
/ Fibroblasts - ultrastructure
/ Gene Expression Regulation, Developmental
/ Humans
/ Microscopy, Electron, Transmission
/ Mitogen-Activated Protein Kinases - genetics
/ Mitogen-Activated Protein Kinases - metabolism
/ Molar - growth & development
/ Odontoblasts - ultrastructure
/ Proteins
/ Rats
/ Rodents
/ Teeth
