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An investigation into the formation processes of collagen bundles in periodontal ligament by innovative imaging methods

Research Project

Project/Area Number 17K17090
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Morphological basic dentistry
Research InstitutionKurume University

Principal Investigator

Hirashima Shingo  久留米大学, 医学部, 講師 (70647784)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords歯根膜 / FIB-SEM / 3次元解析 / コラーゲン線維 / ボリュームイメージング / 定量解析 / 細胞性ネットワーク / 異種細胞間ネットワーク / イメージング / 3次元解析 / セメント質 / imaging / FIB/SEM / 3次元構造解析 / 電子顕微鏡 / 3次元微細構造解析 / 歯学 / 口腔解剖学 / ライブイメージング
Outline of Final Research Achievements

The periodontal ligament (PDL) has important functions besides tooth anchoring including proprioception, sensory detection, and repair of damaged tissue. However, little is known about how the regular-PDL fiber bundle arrays are formed, maintained, and remodeled over large distances from cementum to alveolar bone. We investigated the three-dimensional ultrastructureof PDL fibroblasts (PDLFs) and PDL collagen bundles by FIB-SEM tomography. We have shown that PDLFs have a flat shape with long processes or a wing-like shape, not spindle shape, while PDL bundles are a multiple-branched structure wrapped in thin sheets of PDLF cytoplasm. Furthermore, PDLFs form an extensive cellular network between the cementum and alveolar bone. Our previous histomorphological study revealed the osteocyte-osteoblast-PDL cellular network. We extended this knowledge and revealed the cementum-PDL-bone cellular network, which may orchestrate the remodeling and modification of periodontal tissue.

Academic Significance and Societal Importance of the Research Achievements

歯根膜は歯の周囲に存在し、コラーゲン線維(歯根膜線維)を主体とする組織であり、歯の機能に必須である。また、臨床的にも治療の予後に関わる重要な組織である。しかしながら、歯-骨間にわたる長い歯根膜線維の形成過程、線維の配向性はどのように決められるのか、力学的負荷による歯根膜線維の改変過程など、未だ不明な点が多い。本研究は、これまで技術的な問題から困難であったメゾスケールでの歯根膜細胞と歯根膜線維束の3次元微細構造を明らかにした。また、セメント質-歯根膜-骨における異種細胞間ネットワークの存在を形態学的に示した。本研究の結果は今後、歯の再生治療を検討していく上で、基盤的知見になり得ると考えられる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (14 results)

All 2020 2019 2018 2017

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 6 results) Presentation (8 results)

  • [Journal Article] Three-dimensional ultrastructural imaging and quantitative analysis of the periodontal ligament.2020

    • Author(s)
      Hirashima S, Kanazawa T, Ohta K, Nakamura KI
    • Journal Title

      Anatomical science international

      Volume: 95 Issue: 1 Pages: 1-11

    • DOI

      10.1007/s12565-019-00502-5

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cellular network across cementum and periodontal ligament elucidated by FIB/SEM tomography.2020

    • Author(s)
      Shingo Hirashima, Keisuke Ohta, Tomonoshin Kanazawa, Akinobu Togo, Risa Tsuneyoshi, Jingo Kusukawa, Kei-Ichiro Nakamura
    • Journal Title

      Microscopy

      Volume: 69 Issue: 1 Pages: 53-58

    • DOI

      10.1093/jmicro/dfz117

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Three-dimensional ultrastructural and histomorphological analysis of the periodontal ligament with occlusal hypofunction via focused ion beam/scanning electron microscope tomography.2019

    • Author(s)
      Hirashima S, Ohta K, Kanazawa T, Togo A, Kakuma T, Kusukawa J, Nakamura KI
    • Journal Title

      Scientific reports

      Volume: 9 Issue: 1 Pages: 9520-9520

    • DOI

      10.1038/s41598-019-45963-w

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Three-dimensional ultrastructural analysis and histomorphometry of collagen bundles in the periodontal ligament using focused ion beam/scanning electron microscope tomography2018

    • Author(s)
      Hirashima Shingo、Ohta Keisuke、Kanazawa Tomonoshin、Okayama Satoko、Togo Akinobu、Miyazono Yoshihiro、Kusukawa Jingo、Nakamura Kei-ichiro
    • Journal Title

      Journal of Periodontal Research

      Volume: early view Issue: 1 Pages: 12592-12592

    • DOI

      10.1111/jre.12592

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Uncoupled mitochondria quickly shorten along their long axis to form indented spheroids, instead of rings, in a fission-independent manner.2018

    • Author(s)
      Miyazono Yoshihiro, Shingo Hirashima, Naotada Ishihara, Jingo Kusukawa, Kei-ichiro Nakamura, and Keisuke Ohta
    • Journal Title

      Scientific Report

      Volume: 8 Issue: 1 Pages: 350-350

    • DOI

      10.1038/s41598-017-18582-6

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of Surface Texture of a Polyimide Porous Membrane on the Bone Formation Rate2018

    • Author(s)
      Shingo Hirashima, Keisuke Ohta, Masahiko Hagihara, Motohisa Shimizu, Tomonoshin Kanazawa and Kei-ichiro Nakamura
    • Journal Title

      Journal of Hard Tissue Biology

      Volume: 27 Issue: 1 Pages: 95-100

    • DOI

      10.2485/jhtb.27.95

    • NAID

      130006302015

    • ISSN
      1341-7649, 1880-828X
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] FIB/SEM tomographyを用いた咬合喪失時(挺出時)における歯根膜の3次元構造解析2019

    • Author(s)
      2.平嶋伸悟
    • Organizer
      第61回歯科基礎医学会学術大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] セメント細胞ネットワークの3次元構造解析2019

    • Author(s)
      平嶋伸悟,都合亜記暢,常吉梨沙,太田啓介,楠川仁悟,中村桂一郎
    • Organizer
      日本解剖学会第75回九州支部学術集会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 新機軸イメージングによる歯根膜形成過程の解明2018

    • Author(s)
      平嶋伸悟
    • Organizer
      第124回日本解剖学会総会・全国学術集会
    • Related Report
      2018 Research-status Report
  • [Presentation] 歯根膜線維束の3次元組織形態計測.2018

    • Author(s)
      平嶋伸悟, 金澤知之進, 都合亜記暢, 岡山聡, 宮園 佳宏, 太田啓介, 楠川仁悟, 中村桂一郎.
    • Organizer
      日本解剖学会第74回九州支部学術集会. 口演発表
    • Related Report
      2018 Research-status Report
  • [Presentation] 3Dボリュームイメージングによる歯根膜のメゾスケール構造解析2018

    • Author(s)
      平嶋伸悟
    • Organizer
      第60回歯科基礎医学会学術大会
    • Related Report
      2018 Research-status Report
  • [Presentation] FIB-SEMトモグラフィーの皮膚臨床課題への挑戦2017

    • Author(s)
      太田啓介、力丸由起子、岡毅、右田尚、古賀憲幸、平嶋伸悟、中村桂一郎
    • Organizer
      第123回日本解剖学会総会・全国学術集会
    • Related Report
      2017 Research-status Report
  • [Presentation] 力学的負荷に対する歯根膜細胞の3次元的形態変化の計測2017

    • Author(s)
      平嶋伸悟、金澤知之進、都合亜記暢、岡山聡子、太田啓介、中村桂一郎
    • Organizer
      第123回日本解剖学会総会・全国学術集会
    • Related Report
      2017 Research-status Report
  • [Presentation] FIB/SEM tomographyを用いた歯根膜細胞の3次元形態計測2017

    • Author(s)
      平嶋伸悟、太田啓介、金澤知之進、都合亜記暢、岡山聡子、中村桂一郎
    • Organizer
      日本顕微鏡学会第73回学術講演会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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