International Journal of Oral Biology

The Korean Academy of Oral Biology (대한구강생물학회)
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Induction of Bone Morphogenetic Protein-2 from Gingival Epithelial Cells by Oral Bacteria

  • Kim, Young-Sook (Departments of Oromaxillofacial Infection & Immunity, School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Ji, Suk (Departments of Oromaxillofacial Infection & Immunity, School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Jung, Hong-Moon (Cell and Developmental Biology, School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Woo, Kyung-Mi (Cell and Developmental Biology, School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Choi, Young-Nim (Departments of Oromaxillofacial Infection & Immunity, School of Dentistry and Dental Research Institute, Seoul National University)
  • Published : 2007.09.30
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Abstract

We hypothesized that plaque-associated bacteria may have a role in maintenance of alveolar bone. To test it, immortalized gingival epithelial HOK-16B cells were co-cultured with live or lysed eight plaque bacterial species and the expression levels of bone morphogenetic protein (BMP)-2 and -4 were examined by real time reverse transcription-polymerase chain reaction. Un-stimulated HOK-16B cells expressed both BMP-2 and -4. Co-culture with plaque bacterial lysates had significant effects on the level of BMP-2 but not on that of BMP-4. Five species including Streptococcus sanguinis, S. gordonii, Veillonella atypica, Porphyromonas gingivalis, and Treponema denticola substantially up-regulated the level of BMP-2. In contrary to the upregulatory effect of lysate, live T. denticola suppressed the expression of BMP-2. In addition, in vitro osteoblastic differentiation assay using C2C12 cells and the conditioned medium of HOK-16B cells confirmed the production of BMPs by gingival epithelial cells and the modulation of BMP expression by the lysates of S. sanguinis and T. denticola. In conclusion, we have shown that plaque bacteria can regulate the expression of BMP-2 by gingival epithelial cells, the physiologic meaning of which needs further investigation.

Keywords

References

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