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Micromechanical analysis of cortical bone in type 2 diabetes by using synchrotron radiation X-ray diffraction and scattering

Research Project

Project/Area Number 19K20691
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 90110:Biomedical engineering-related
Research InstitutionThe University of Tokushima

Principal Investigator

HASE Eiji  徳島大学, ポストLEDフォトニクス研究所, 特任助教 (50805512)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords放射光 / X線 / 骨 / 微細力学 / SAXS / WAXD / 糖尿病
Outline of Research at the Start

生体組織の内部微細構造を数Åオーダーから数十nmオーダーで時分割に可視化できる小角散乱(SAXS: small-angle X-ray scattering),広角回折(WAXD: wide-angle X-ray diffraction)同時計測装置を力学試験と組み合わせ,2型糖尿病皮質骨の微細力学解析に応用する.2型糖尿病では,終末糖化産物によるコラーゲン架橋の異常により骨強度が低下すると報告されているが,本手法で可視化する骨中ハイドロキシアパタイトとコラーゲンの変形の振る舞いが糖尿病によってどのように,どの程度変化するのかを疾患の重篤度・進行度の違いとともに調査することをゴールとする.

Outline of Final Research Achievements

In this study, we combined a simultaneous synchrotron radiation wide-angle X-ray diffraction and small-angle X-ray scattering measurement with mechanical testing and applied it to the micromechanical analysis of cortical bone in type 2 diabetes. We confirmed that macromechanical properties tend to decrease in the diabetes model. As microscopic changes in the diabetes model compared with the control model, we also confirmed that hydroxyapatite in bone increases the strains, whereas collagen strains decrease. In addition, from the results of collagen imaging with near-infrared light, we confirmed that the local region measured by the synchrotron radiation experiment could be regarded as a representative region in the whole sample. In the future, we plan to carry out synchrotron radiation experiments after unifying the experimental conditions and then obtain new findings that can determine the effect of diabetes on the micromechanical properties of bone.

Academic Significance and Societal Importance of the Research Achievements

1型,2型糖尿病は共に患者の骨折リスクの上昇につながることが調べられている.本研究では,糖尿病による骨の微細力学特性への影響の調査を目的としており,これは少子高齢化が進む我が国において生活の質を向上させ,健康寿命を延ばすことに繋がるものであると考えられる.
学術的意義として,当初は骨バイオメカニクス分野におけるX線CTのみにとどまらない放射光X線利用研究の開拓という位置付けであったが,本研究の今後の進捗により,糖尿病による骨の微細力学特性への影響が真に明らかとなれば骨バイオメカニクス分野自体への貢献も期待できる上,本手法を用いた他の骨疾患への応用展開も見えてくる.

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Quantitative Evaluation of Both Histological and Mechanical Recovery in Injured Tendons Using Fourier-Transform Second-Harmonic-Generation Microscopy2021

    • Author(s)
      Hase Eiji、Minamikawa Takeo、Sato Katsuya、Yonekura Daisuke、Takahashi Mitsuhiko、Yasui Takeshi
    • Journal Title

      IEEE Journal of Selected Topics in Quantum Electronics

      Volume: 27 Issue: 4 Pages: 1-8

    • DOI

      10.1109/jstqe.2021.3063535

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] In vivo time-series quantitative evaluation of skin burn healing using second-harmonic-generation microscopy2020

    • Author(s)
      Eiji Hase, Ryosuke Tanaka, Shu-ichiro Fukushima, and Takeshi Yasui
    • Organizer
      BiOS2020 in Photonics West 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of wavelength on polarization-resolved second-harmonic-generation microscopy in thick tissues2020

    • Author(s)
      Eiji Hase, Kosuke Maeda, Takahiko Mizuno, Takeo Minamikawa, and Takeshi Yasui
    • Organizer
      BiOS2020 in Photonics West 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 放射光X線小角散乱・広角回折法を用いた糖尿病皮質骨の力学特性解析2019

    • Author(s)
      長谷栄治, 松本健志, 八木直人
    • Organizer
      生体医工学シンポジウム2019
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2022-01-27  

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