Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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MMP-1 and TIMP-1 production in MG-63 cells stimulated with Prevotella nigrescens Lipopolysaccharide

Prevotella nigrescens lipopolysaccharides로 자극된 MG63 세포에서 분비되는 기질금속단백질 MMP-1과 TIMP-1의 수준에 관한 연구

  • Yang Won-Kyung (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Kim Mi-Ri (Department of Conservative Dentistry, Asan Medical Center) ;
  • Shon Won-Jun (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Lee In-Bog (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Cho Byeong-Hoon (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Um Chung-Moon (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
  • Son Ho-Hyun (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
  • 양원경 (서울대학교 치과대학 치의학과 보존학교실) ;
  • 김미리 (아산 병원 보존과) ;
  • 손원준 (서울대학교 치과대학 치의학과 보존학교실) ;
  • 이인복 (서울대학교 치과대학 치의학과 보존학교실) ;
  • 조병훈 (서울대학교 치과대학 치의학과 보존학교실) ;
  • 엄정문 (서울대학교 치과대학 치의학과 보존학교실) ;
  • 손호현 (서울대학교 치과대학 치의학과 보존학교실)
  • Published : 2004.09.01
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Abstract

The purpose of this study is to monitor the secretion of matrix metalloproteinase-1 (MMP-1) and tissue inhibitor of metalloproteinase-1 (TIMP-1) produced by human osteosarcoma cell line (MG63) stimulated with Prevotella nigrescens lipopolysaccharides (LPS). and to compare the level of secretion before and after the treatment of calcium hydroxide on P. nigrescens LPS. LPS was extracted and purified from anaerobically cultured P. nigrescens. MG63 cells were stimulated by the LPS (0, 1, $10{\;}\mu\textrm{g}/ml$) or LPS($10{\;}\mu\textrm{g}/ml$) pretreated with 12.5 mg/ml of $Ca(OH)_2$ for 3 days. Total RNA was isolated from the cell. and real-time quantitative polymerase chain reaction (PCR) was performed for quantification of MMP-1 and TIMP-1. The results were as follows. 1. MMP-1 mRNA expression at 48 hr was highly increased by stimulation with P. nigrescens LPS. The increase was dose-dependent. 2. When stimulated with ($1{\;}\mu\textrm{g}/ml$ of LPS. TIMP-1 mRNA expression was highly increased at 24 hr and 48 hr. However. TIMP-1 expression was suppressed at higher concentration ($10{\;}\mu\textrm{g}/ml$). 3. When P. nigrescens LPS was pretreated with $Ca(OH)_2$. MMP-1 and TIMP-1 gene expression was downregulated. The results of this study suggest that transcriptional regulation of MMP-1 and TIMP-1 by P. nigrescens LPS could be one of the important mechanisms in bone resorption of periapical inflammation. The result of calcium hydroxide on MMP-1 and TIMP-1 gene expression suppression shows that calcium hydroxide detoxified bacterial LPS and thus should be used the medication of choice for intracanal dressings in root canal infected with black-pigmented bacteria.

본 연구의 목적은 Prevotella nigrescens lipopolysaccharides (LPS)로 자극된 MG63 osteosarcoma 세포에서 생성, 분비되는 기질금속단백효소인 MMP-1과 그 억제제인 TIMP-1을 측정할 뿐아니라 수산화칼슘으로 처리한 P. nigrescens LPS에 의한 기질금속단백효소와 그 억제제의 분비수준의 변화를 알아보는데 있다. 혐기성 조건에서 배양한 P. nigrescens로부터 LPS를 추출하여 순수정제한 다음 0, 1 그리고 $10{\;}\mu\textrm{g}/ml$의 LPS 농도로 MG63 세포를 자극하거나 또는 수산화칼슘으로 처리한 $10{\;}\mu\textrm{g}/ml$의 LPS로 세포를 다양한 자극하여 다양한 시간이 경과한 다음 세포로부터 분비되는 MMP-1과 TIMP-1의 RNA 수준을 real time-PCR 방법으로 측정하였다. 실험결과 MMP-1의 mRNA수준은 48시간에서 최고에 달하였고 그 분비정도는 LPS의 농도에 비례하였다. TIMP-1 mRNA는 $1{\;}\mu\textrm{g}/ml$의 세균성 LPS 자극시 24시간 및 48시간에서 높은 증가를 보였으나 고농도인 $10{\;}\mu\textrm{g}/ml$의 LPS로 자극한 경우 오히려 그 발현이 억제되었다. 또한 수산화칼슘으로 전처리한 P. nigrescens LPS로 자극한 MG 63 세포에서는 MMP-1과 TIMP-1의 분비가 억제되었다. 이러한 결과를 통해 볼 때 P. nigrescens LPS에 의한 MMP-1과 TIMP-1의 발현조절이 치근단 질환에서 발생하는 치조골 흡수 기전중 하나로 사료된다. 뿐만 아니라 P. nigrescens에 의해 분비되는 기질금속단백효소를 매개로 하는 염증반응 감소에 수산화칼슘이 효과적으로 작용하는것으로 확인되어 치근단 질환에 관여하는 세균성 LPS를 제거하기 위해 임상적으로 사용되는 근거가 될 수 있다.

Keywords

References

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