Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Expression of Thymosin β4 in Ameloblasts during Mouse Tooth Development

  • Choi, Baik-Dong (Department of Oral Histology and Developmental Biology, School of Dentistry, Chosun University) ;
  • Lee, Seung-Yeon (Department of Oral Histology and Developmental Biology, School of Dentistry, Chosun University) ;
  • Nho, Tae-Hee (Department of Oral Histology and Developmental Biology, School of Dentistry, Chosun University) ;
  • Jeong, Soon-Jeong (Department of Dental Hygiene, College of Health Science, Youngsan University) ;
  • Lim, Do-Seon (Department of Dental Hygiene, College of Health Science, Eulji University) ;
  • Bae, Chun-Sik (Department of Veterinary Surgery, College of Veterinary Medicine, Cheonnam National University) ;
  • Jeong, Moon-Jin (Department of Oral Histology and Developmental Biology, School of Dentistry, Chosun University)
  • Received : 2015.11.04
  • Accepted : 2016.02.04
  • Published : 2016.03.30
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Abstract

Thymosin ${\beta}4$ ($T{\beta}4$) has been recently reported to play a role in dentinogenesis by regulating the expression of dentin matrix proteins. Based on previous studies, it is hypothesized that $T{\beta}4$ is associated with the formation of the enamel matrix and thus plays an important role in ameloblast. However, there is no report on the function of $T{\beta}4$ during tooth development so far. Therefore, in this study, we aimed to investigate the expression of $T{\beta}4$ and its function in ameloblasts during mouse tooth development. $T{\beta}4$ was expressed strongly in the tooth bud at the bud stage and in the dental lamina and oral epithelium at the cap stage. In advanced bell stage at postnatal day 4, large elongated ameloblasts were observed and the expression of the $T{\beta}4$ protein was the highest, with the enamel being was thicker than that in the early bell stage. The length of ameloblasts increased from the presecretory to the secretory stage and decreased from the maturation to the protective stage. These results suggest that $T{\beta}4$ participates not only in the proliferation of oral epithelial cells during the early stage of tooth development but also regulates enamel protein secretion in ameloblasts and enamel mineralization.

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References

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