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Research for the pathophysiological mechanism and therapeutics of bisphosphonate-related osteonecrosis of the jaw (BRONJ)

Research Project

Project/Area Number 16K15323
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Applied pharmacology
Research InstitutionMeikai University

Principal Investigator

TAJIMA MASAMICHI  明海大学, 歯学部, 講師 (70130995)

Co-Investigator(Kenkyū-buntansha) 田草川 徹  明海大学, 歯学部, 講師 (40538443)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsビスホスホネート / 顎骨壊死 / 骨芽細胞障害 / リン酸トランスポーター / ミトコンドリア / オートファジー / キレート形成 / マイトファジー / 細胞内取り込み経路 / Pit-2 / リソソーム / リン酸水素イオン / BPの細胞内取込み / 病態解明 / 治療法
Outline of Final Research Achievements

Bisphosphonates (BP), bone resorption inhibitors, has been actively used in osteoporosis or bone metastasis of cancer. However, BP has induced serious jawbone necrosis (BRONJ) with poor prognosis in some patients after oral surgical treatments. The effective treatment has still not been found for patients suffering in the valley between medical and dental care. The purpose of research is to elucidate its pathophysiological mechanism, and to establish a therapeutic method. My data indicates that low concentration of BP, not toxic in osteoblastic cells, induced cytotoxic effects when hydrogen phosphate anion was increased in osteoblast culture. This environment increased expression of phosphate transporters in osteoblastic cells, and enhanced uptake of BP into osteoblastic cells, resulting in impairment of mitochondria.

Academic Significance and Societal Importance of the Research Achievements

臨床濃度のBPは破骨細胞内への選択的な取り込みによって、骨吸収を抑制し治療効果を発現し、低濃度のBPでは骨芽細胞に対しては障害性がほとんど認められない。しかし、リン酸水素イオン濃度の増加などで骨芽細胞のリン酸トランスポーターが誘導されると、これを介してBPの骨芽細胞内取り込みが亢進してしまい、BPがミトコンドリア機能障害を引き起こして、骨芽細胞障害が容易に発生する可能性が示された。そこで、この障害機序を阻害することにより、BRONJ発症の予防と治療に繋げられる可能性がある。BPの治療を継続しながら、基礎疾患の治療に悪影響を与えない局所的なアプローチによる治療法を考案したい。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (4 results)

All 2019 2018 2017

All Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Bisphosphonates induce osteoblastic cell death through the inhibition of autophagic flux2019

    • Author(s)
      田島雅道
    • Organizer
      第92回日本薬理学会年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Increase of phosphate enhances the cytotoxicity of osteoblasts by bisphosphonates2018

    • Author(s)
      Masamichi Tajima
    • Organizer
      18th World Congress of Basic and Clinical Pharmacology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bisphosphonates are taken in osteoblasts through the phosphate transporter.2017

    • Author(s)
      Masamichi Tajima
    • Organizer
      第90回日本薬理学会年会
    • Place of Presentation
      長崎ブリックホール (長崎県長崎市茂里町)
    • Year and Date
      2017-03-15
    • Related Report
      2016 Research-status Report
  • [Presentation] 骨芽細胞に取り込まれたbisphosphonatesはリソソームに集積する2017

    • Author(s)
      田島雅道
    • Organizer
      第59回歯科基礎医学会学術大会
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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