Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
권호 표지

Effects of Porphyromonas gingivalis extracts on the function of mouse calvarial primary osteoblastic cells

Porphyromonas gingivalis 추출물이 마우스 두개골 일차 조골세포의 기능에 미치는 효과

  • Yun, Jeong-Ho (Department of Periodontology, Oral Science Research Institute, College of Dentistry, Yonsei University) ;
  • Choi, Seong-Ho (Department of Periodontology, Oral Science Research Institute, College of Dentistry and Brain Korea 21 project for Medical Science, Yonsei University) ;
  • Cho, Kyoo-Sung (Department of Periodontology, Oral Science Research Institute, College of Dentistry and Brain Korea 21 project for Medical Science, Yonsei University) ;
  • Chai, Jung-Kiu (Department of Periodontology, Oral Science Research Institute, College of Dentistry, Yonsei University) ;
  • Kim, Chong-Kwan (Department of Periodontology, Oral Science Research Institute, College of Dentistry and Brain Korea 21 project for Medical Science, Yonsei University) ;
  • Kim, Chang-Sung (Department of Periodontology, Oral Science Research Institute, College of Dentistry, Yonsei University)
  • 윤정호 (연세대학교 치과대학 치주과학교실, 구강과학연구소) ;
  • 최성호 (연세대학교 치과대학 치주과학교실, 구강과학연구소, BK21 의과학사업단) ;
  • 조규성 (연세대학교 치과대학 치주과학교실, 구강과학연구소, BK21 의과학사업단) ;
  • 채중규 (연세대학교 치과대학 치주과학교실, 구강과학연구소) ;
  • 김종관 (연세대학교 치과대학 치주과학교실, 구강과학연구소, BK21 의과학사업단) ;
  • 김창성 (연세대학교 치과대학 치주과학교실, 구강과학연구소)
  • Published : 2003.12.31
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Abstract

Porphyromonas gingivalis has been implicated as an important periodontophathic bacterium in the etiology and progression of periodontal diseases. It has been reported that P.gingivalis may mediate periodontal destruction not only directly through its virulence factors, but also indirectly by including complex host mediated inflammatory reponses. The purpose of this study was t o evaluate the effects of P.gingivalis on the bone formation and resorption by osteoblasts. For this purpose, after determining the concentration below which sonicated P.gingivalis extracts (SPEs) have no cytotoxicity on mouse calvarial primary osteoblastic (POB) cells, we investigated the effects of SPEs on the alkaline phosphatase (ALP) activity, matrix metalloproteinase (MMP) expression (MMP-2, -9, 13), and prostaglandin $E_2$ ($PGE_2$) release in POB cells by treatment with SPEs below that concentration. The results were as follows; 1. SPEs showed no cytotoxic effect on POB cells up to a concentration of 1 ${\mu}m$/ml. 2. The treatment with SPEs reduced ALP activity in a dose-dependent manner in POB cells, In addition, when we investigated the effect of SPEs (1 ${\mu}m$/ml) on ALP activity for different exposure periods, statistically significant inhibition of ALP activity was shown at 2 days of exposure, and further significant inhibition occurred by extending the periods of exposure. 3. The treatment with SPEs stimulated the gene expression of MMP-9 in POB cells. 4. The pre-treatment with SPEs increased the amount of $PGE_2$ released in POB cells. In summary, the present study shows that P.gingivalis could inhibit osteogenesis and stimulate bone resorption not only by reducing ALP activity but also by increasing MMP-9 mRNA expression in osteoblasts, possibly through an endogenous $PGE_2$ pathway. In addition, our results suggest that if P.gingivalis affects osteoblasts in early differentiation stage, such effects by P. gingivalis could be irreversible.

Keywords

References

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