Effect of Pyrroloquinoline Quinone on Osteoclast Generation and Activity

Pyrroloquinoline quinone이 파골세포의 생성 및 활성에 미치는 영향

  • Ko, Seon-Yle (Department of Oral Biochemistry, School of dentistry, Dankook University) ;
  • Han, Dong-Ho (Department of Oral Biochemistry, School of dentistry, Dankook University) ;
  • Kim, Jung-Keun (Department of Oral Biochemistry, School of dentistry, Dankook University)
  • 고선일 (단국대학교 치과대학 생화학교실) ;
  • 한동호 (단국대학교 치과대학 생화학교실) ;
  • 김정근 (단국대학교 치과대학 생화학교실)
  • Published : 2005.09.30

Abstract

We examined the effect of PQQ, as a scavenger of superoxide, on osteoclast-like cell formation and on mature osteoclast function. To determine whether PQQ scavenges the superoxide, nitroblue tetrazolium (NBT) staining, which is a method to detect superoxide, was performed on HD-11 cells which are a chick myelomonocytic cell line having tartrate-resistant acid phosphatase (TRAP) activity in response to 1,25-dihydroxyvitamin $D_3\;[1,25(OH)_2D_3]$. Histochemical study of TRAP was also performed on HD-11 cells. PQQ inhibited the TRAP-positive multinucleated cell formation of chicken bone marrow cells was also examined. The addition of 20 ${\mu}M$ PQQ inhibited the formation of TRAP-positive multinucleated cell. When chicken osteoclasts were cultured on dentin slices, treatment of 20 ${\mu}M$ PQQ resulted in a significant decrease in dentin resorption by osteoclasts in terms of total resorption area and number of resorption pits. The present data suggest that PQQ, possibly as a scavenger of superoxide ion, inhibits the osteoclastic differentiation and bone resorption.

본 연구는 superoxide의 제거물질로 알려진 pyrroloquinoline quinone (PQQ)이 파골세포의 분화 및 성숙한 파골세포의 활성에 미치는 영향을 알아보고자 시행하였다. Superoxide를 인지하는 방법인 nitroblue tetrazolium (NBT) 염색방법을 이용하여 PQQ가 HD-11 세포가 생성한 superoxide를 제거하는지 확인하였다. 본 연구에서 이용된 HD-11세포는 닭 myelomonocytic 세포주로써 1,25-dihydroxyvitamin $D_3\;[1,25(OH)_2D_3]$ 처리시 tartrate-저항성 산성인산분해효소 (tartrate-resistant acid phosphatase, TRAP)의 활성을 나타내는 등 파골세포의 특성을 지니는 세포로 알려져 있다. HD-11세포에서 TRAP 활성을 확인하기 위하여 조직화학적 염색을 시행하였다. PQQ는 NBT의 환원을 감소시켰으며 1,25(OH)2D3에 의해 유도된 TRAP 활성을 억제하였다. 또한 PQQ가 닭 골수세포에서 TRAP 양성 다핵세포의 형성에 미치는 영향도 관찰한 결과 20 ${\mu}M$의 PQQ는 TRAP 양성 다핵세포의 형성을 현저히 억제하였다. 닭 파골세포를 상아질 절편에서 배양하면서 20 ${\mu}M$의 PQQ를 처치한 경우 파골세포에 의한 상아질 흡수가 현저히 억제되었다. 따라서 본 연구결과 PQQ가 superoxide의 제거물질로 작용하여 파골세포의 분화 및 활성도에 영향을 미칠 것으로 사료되며, 이는 생리적 혹은 병적 골흡수에 억제적인 작용을 할 물질로의 가능성을 시사한다.

Keywords

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