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Bone formation stimulation by semiconductor laser via Cbfa1/Pebp2αA

Research Project

Project/Area Number 12672018
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 矯正・小児・社会系歯学
Research InstitutionNihon-University

Principal Investigator

SHIMIZU Noriyoshi  Nihon-University, School of Dentistry, Associate Professor, 歯学部, 助教授 (40154299)

Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordslow-power laser / bone formation / osteoblast / IGF-I / calvaria / レーザー / bone nodule
Research Abstract

Bone formation acceleration following low-intensity laser treatment has been demonstrated in both animal and cell culture models, however, the action mechanisms of irradiation on bone are unclear. We previously reported that low-intensity laser irradiation stimulated bone nodule formation through enhanced cellular proliferation and differentiation, thus, in the present study, we attempted to determine whether insulin-like growth factor (IGF)-I is responsible for the action observed. Osteoblast-like cells were isolated from fetal rat calvariae and cultured with rat recombinant (r) IGF-I, IGF-I-antibody (Ab), and/or the cells were irradiated once (3.75 J/cm^2) with a low- intensity Ga-Al-As laser (830 nm) at the subconfluent stage. The cells were cultured for 24 days and stained using the von-Kossa technique. Treatment with recombinant IGF-I for 6 days significantly stimulated the number and area of bone nodules as compared to the control (1.4-1.6-fold), and these effects were quite similar to those by laser irradiation. Moreover, the stimulatory effect by laser irradiation was abrogated dose-dependently by treatment with IGF-I-Ab for 6 days. To confirm the mechanisms responsible for the action of laser irradiation IGF-I protein levels and gene expression in rat calvarial cells were also examined. IGF-I production in the medium was significantly increased at 3 and 6 days after laser irradiation as compared to the control, and the cell mass center expressed IGF-I. Gene expression, examined by semi-quantitative RT-PCR, was also found to be significantly stimulated at 1 and 3 days after irradiation, and returned to the control level thereafter. These results indicate that the stimulatory effect of bone nodule formation by low-intensity laser irradiation may be at least partly mediated by IGF-I expression. Gene expression of Cbfa1/Pebp2αA by laser irradiation is in progress.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Ueda Y., Shimizu N.: "Pulse irradiation low-power laser stimulates bone nodule formation"Jof Oral Science. 43. 55-60 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 清水典佳: "レーザーの矯正治療への応用 低出力レーザ照射による矯正治療期間の短縮と疼痛軽減の可能性"光アライアンス. 11(12). 38-41 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 清水典佳: "歯科医学と健康の創造(レーザーと矯正治療)"藤田勝治編, 医歯薬出版. 379(210-211) (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 清水典佳: "歯周病学最前線(低出力レーザーによる組織再生)"奥田克爾ら編, 日本歯科評論. 354(332-340) (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ueda Y, Shimizu N.: "Pulse irradiation of low-power laser stimulates bone nodule formation"J Oral Science. 43. 55-60 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Shimizu N.: "Prospect of shortening treatment period and relieving pain due to orthodontic treatment utilizing a low-power laser (Japanese)"Optical alliance. 11(12). 38-41 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Shimizu N: "Periodontal tissue regeneration utilizing a low-power laser (Japanese)"In : Okuda K, Ed. Front line of periodontology. Nihonsikahyouron, Tokyo. 332-340 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Shimizu N: "Laser application in orthodontics (Japanese)"In : Fujita K, Ed. Toward new health creativity in dental science. Ishiyakusyuppan, Tokyo. 210-211 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ueda Y., Shimizu N.: "Pulse irradiation of low-power laser stimulates bone nodule formation"J of Oral Science. 43. 55-60 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yuuji Ueda & Noriyoshi Shimizu: "Pulse irradiation of low-power laser stimulates bone nodule formation"J Oral Science. (in press).

    • Related Report
      2000 Annual Research Report
  • [Publications] 清水典佳: "レーザの矯正治療への応用低出力レーザ照射による矯正治療期間の短縮と疼痛軽減の可能性"光アライアンス. 11巻12号. 38-41 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 清水典佳: "歯周病学最前線,低出力レーザーによる組織再生"奥田克爾 ら. 9 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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