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Elucidation of the mechanism for differentiation of odontoblasts and mineralization of dentin

Research Project

Project/Area Number 11671913
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Conservative dentistry
Research InstitutionKANAGAWA DENTAL COLLEGE

Principal Investigator

KAWATA Akir (2000)  DEPATMENT OF DENTISTRY, KANAGAWA DENTAL COLLEGE, RESEARCH ASSOCIATE, 歯学部, 助手 (30329198)

里吉 正徳 (1999)  神奈川歯科大学, 歯学部, 助手 (90257303)

Co-Investigator(Kenkyū-buntansha) KOIZUMI Tadahiko  DEPATMENT OF DENTISTRY, KANAGAWA DENTAL COLLEGE, RESEARCH ASSOCIATE, 歯学部, 助手 (90288077)
MIKUNI-TAKAGAKI Yuko  DEPATMENT OF DENTISTRY, KANAGAWA DENTAL COLLEGE, LECTULER, 歯学部, 講師 (60050689)
SATOYOSHI Masanori  DEPATMENT OF DENTISTRY, KANAGAWA DENTAL COLLEGE, RESEARCH ASSOCIATE, 歯学部, 助手 (90257303)
TERANAKA Toshio  DEPATMENT OF DENTISTRY, KANAGAWA DENTAL COLLEGE, PROFESSOR, 歯学部, 教授 (60104460)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1999: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordsodontoblasts / matorigel / phosphophoryn / type IV collagen / gelatinase / metalloproteinase / enzymogram / knock out mouse / (1)象牙芽細胞 / (2)マトリゲル / (3)フォスフォフォリン / (4)タイプIVコラーゲン / (5)ゼラチナーゼA / (6)マトリックスメタロプロテアーゼ / (7)エンザイモグラム / (8)ノックアウトマウス
Research Abstract

In the serum-free culture medium of bovine odontoblasts, we detected active gelatinolytic metalloproteinases, MMP-2 and MMP-9 (gelatinase A and B). The activity of MMP-2, in particular, appeared suddenly around day 21 in the culture, coinciding with the development of odontoblastic cell processes and the loss of alkaline phosphatase. RT-PCR analysis of these odontoblasts demonstrated that messages of MMP-2 but not MMP-9 increased significantly between day 15 and day 21. This in vitro observation indicates that medium conditioned by these odontoblasts and containing significant amounts of MMP-2 mRNA, degrades not only the collagenous substrates but also purified dentin phosphophoryn as well.
We have also observed that dephosphorylated dentin phosphoprotein beccmes a better substrate for casein kinase II after limited proteolysis with MMP-2. These results support our working hypothesis that MMP-2 mediated proteolytic processing is an important step in accelerating the process of dentin matrix maturation, which includes phosphorylation and subsequent mineralization. The authors and others have suggested the significance of extracellular phosphorylation of matrix proteins in biomineralization both in bone and in dentin (Zhu et al., Biochem. J., 323 : 637-643, 1997 ; Mikuni-Takagaki et al., J.Bone Miner. Res., 10 : 231-241, 1995). Our present histochemical analysis in MMP-2 knockout mice confirms this idea, with the the delayed formation of mineralized tissues, dentin and bone.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] T.Koizumi, et al.: "Reactivation of Bovine Odontoblasts in a long-term Culture Exposure to Inflammatory Cytokines"Journal of Hard Tissue Biology. 8. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Satoyoshi, et al.: "Matrix metalloproteinase-2 in dentin matrix mineralization."Journal of Endodontics. (In press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Satoyoshi M. et al.: "Matrix Metalloproteinase-2 in Dentinogenesis in Chemistry and Biology of Mineralized Tissues"American Academy of Orthopaedic Surgeons. 458 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Koizumi, et al.: "Reactivation of Bovine Odontoblasts in a long-term Culture Exposure to Inflammatory Cytokines"Journal of Hard Tissue Biology. 8. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Satoyoshi, et al.: "Matrix metalloproteinase-2 in detin matrix mineralization."Journal of Endodontics. (In press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Satoyoshi, et al.: "Matrix Metalloproteinase-2 in Dentinogenesis in Chemistry and Biology of Mineralized Tissues"American Academy of Orthopaedic Surgeons. 458. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Satoyoshi,M. et al.: "Matrix metalloproteinase-2 in dentin matrix mineralization."J.Endodontics. (In press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Satoyoshi M. et al.: "Matrix Metalloproteinase-2 in Dentinogenesis in Chemistry and Biology of Mineralized Tissues"American Academy of Orthopaedic Surgeons. 458 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Koizumi: "Reactivation of Bovine Odoutoblasts in a Long-Term Culture Exposure to Inflammatory Cytokines"Journal of Hord Tissus Biology. 8. 33-36 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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