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特異的タンパク質ノックダウン法を用いた細胞外基質と骨形成シグナルの相互作用の解析

Research Project

Project/Area Number 15659441
Research Category

Grant-in-Aid for Exploratory Research

Allocation TypeSingle-year Grants
Research Field Functional basic dentistry
Research InstitutionHokkaido University

Principal Investigator

田村 正人  北海道大学, 大学院・歯学研究科, 教授 (30236757)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywords骨芽細胞 / 骨形成 / 細胞外基質 / ノックダウン
Research Abstract

マウス筋芽細胞であるC2C12細胞を培養し本研究に用いた.この細胞にBMP2を加えて培養するとアルカリフォスファターゼ(ALP)活性が増加するとともに,骨芽細胞に特異的なオステオカルシンの発現が誘導され,骨芽細胞へ分化しうる.ノーザンプロット法を用い細胞接着因子のmRNA発現を検討したところ,E-カドヘリンならびにα5 integrinの発現が見られた.カドヘリンの細胞内裏打ちタンパク質であるβ-cateninはLef/Tcf1と結合してDNAに結合し転写調節の機能も有している.そこで,Lef/Tcf1応答領域レポーター(pTOP-FLASH)をC2C12細胞にトランスフェクトした.GSK-3によるリン酸化部位を欠失させた活性型β-cateninもしくはWnt3aを導入すると,pTOP-FLASHの活性は増大した.他方,non-canonical WntであるWnt-5aによっては,その活性は増加しなかった.Wnt3aと同時にBMP2を添加したところ,その活性は低下した.これらの結果から,C2C12細胞においてもWntのcanonical経路が存在しBMP2はこれに抑制的に機能することがわかった.RNAiを用いたノックダウンを行うために,α5 integrin等のインテグリンやGSK3βの一部のmRNA配列相当の合成ヌクレオチドをU6プロモーターベクターに挿入したコンストラクトを作製した.このプラスミドをC2C12細胞にトランスフェクトさせノックダウンを行い,機能解析を行ったところ,ALP活性,オステオカルシンmRNA発現の減少ならびにId1遺伝子のBMP2応答領域に対する反応性が低下し,骨芽細胞への分化が抑制された,これらの結果からインテグリンからのシグナルはβ-cateninを介して骨芽細胞分化を制御していることが明らかとなった.

Report

(2 results)
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (12 results)

All 2004 Other

All Journal Article (6 results) Publications (6 results)

  • [Journal Article] Hepatocyte growth factor/scatter factor stimulates migration of muscle precursors in developing mouse tongue.2004

    • Author(s)
      Bandow, K.
    • Journal Title

      J.Cell Physiol. 201

      Pages: 236-243

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Regulation of mRNA expression of matrix extracellular phosphoglycoprotein (MEPE)/osteoblast/osteocyte factor 45 (OF45) by fibroblast growth factor 2 in cultures of rat bone marrow-derived osteoblastic cells.2004

    • Author(s)
      Zhang, G.X.
    • Journal Title

      Endocrine. 24

      Pages: 15-24

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Periodontal ligament cells under intermittent tensile stress regulate mRNA expression of osteoprotegerin and tissue inhibitor of matrix metalloprotease-1 and -2.2004

    • Author(s)
      Tsuji, K.
    • Journal Title

      J.Bone Mineral Metab. 22

      Pages: 94-103

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Extracellular Inorganic Phosphate Regulates Glvr-2 Phosphate Transporter/Retrovirus Receptor mRNA Expression In Rat Bone Marrow Stromal Cells.2004

    • Author(s)
      Wada, K.
    • Journal Title

      J.Cell Physiol. 198

      Pages: 40-47

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Enhanced cementum formation in experimentally-induced cementum defects of the root surface with the application of recombinant basic fibroblast growth factor in collagen gel in vivo.2004

    • Author(s)
      Sato, Y.
    • Journal Title

      J.Periodontol 75

      Pages: 243-248

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Carrier dependent cell differentiation of bone morphogenetic protein-2 induced osteogenesis and chondrogenesis during the early implantation stage in rats.2004

    • Author(s)
      Takita, H.
    • Journal Title

      J Biomed.Mater.Res. 71A

      Pages: 181-189

    • Related Report
      2004 Annual Research Report
  • [Publications] Tamura, M.: "Intracellular mRNA cleavage by 3´ tRNase under the direction of 2´-O-methyl RNA heptamers"Nucleic Acid Res.. 31. 4354-4360 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Nakamura, T.: "Effects of growth/differentiation factor-5 on human periodontal ligament cells."J.Periodontal.Res.. 38. 597-605 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Wada, K.: "Extracellular inorganic phosphate regulates gibbon ape leukemia virus receptor 2/phosphate transporter mRNA expression in rat bone marrow stromal cells"J.Cell Physiol.. 198. 40-47 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Sato, Y.: "Enhanced cementum formation in experimentally-induced cementum defects of the root surface with the application of recombinant basic fibroblast growth factor in collagen gel in vivo."J.Periodontol.. 75. 243-248 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tsuji, K.: "Periodontal ligament cells under intermittent tensile stress regulate mRNA expression of osteoprotegerin and tissue inhibitor of matrix metalloprotease-1 and -2."J.Bone Mineral Metab.. 22. 94-103 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Bandow, K.: "Hepatocyte growth factor/scatter factor stimulates migration of muscle precursors in developing mouse tongue."J.Cell Physiol.. (印刷中). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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