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2008 Fiscal Year Annual Research Report

イオン飛行時間分析法を用いたクラスタ-DNA損傷の直接観測

Research Project

Project/Area Number 20710048
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

藤井 健太郎  Japan Atomic Energy Agency, 先端基礎研究センター, 研究職 (00360404)

Keywords電離放射線 / DNA / クラスター損傷 / 放射光 / イオン
Research Abstract

本研究は、単一の電離放射線によって、どのようなクラスターDNA損傷が生成するのか、またその生成過程についての知見を得るために、単色軟X線によってDNA分子中に同時に二個以上生成するイオンの生成時間とイオン種の相関について調べることが目的である。本年度は放射光ビームラインで今後使用するための、飛行時間型イオン質量分析器をオフラインにおける整備を行うことを計画していたが、放射光ビームラインで今後使用するための、飛行時間型イオン質量分析器をオフラインにおいて整備を行った。整備の後、低エネルギー電子線によるDNA薄膜の照射実験を行い、いくつかのエネルギーにおける鎖切断と塩基損傷の収率を求める実験を行った。低エネルギー電子線の飛程が非常に短い(数十nm)ため、実験条件の最適化にはまだ多少時間を要するが概ね実験が終了した。またマルチチャンネルスケーラーやパルス電源の整備を行い、飛行時間測定に向けた実験装置および測定装置の準備が概ね終了した。
さらに放射光施設において、DNA薄膜に対する軟X線照射実験を行い、照射によるX線吸収端近傍微細スペクトルの変化を観測した。得られた情報により、軟X線によってDNA分子にどのような変化が生じるかの知見を得ることに成功した。

  • Research Products

    (22 results)

All 2009 2008

All Journal Article (9 results) (of which Peer Reviewed: 9 results) Presentation (13 results)

  • [Journal Article] Spectral Change of X-ray Absorption Near Edge Structure of DNA Thin Films Irradiated with Monochromatic Soft X-rays2009

    • Author(s)
      K. Fujii, A. Yokoya
    • Journal Title

      Radiation Physics and Chemistry (印刷中)

    • Peer Reviewed
  • [Journal Article] EPR Study of Radiation Damage to DNA Irradiated with Synchrotron Soft X-rays around Nitrogen and Oxygen K-edge2009

    • Author(s)
      A. Yokoya, K. Fujii, Y. Fukuda, M. Ukai
    • Journal Title

      Radiation Physics and Chemistry (印刷中)

    • Peer Reviewed
  • [Journal Article] Synchrotron Radiation Photoelectron Studies for Primary Radiation Effects using a Liquid Water Jet in Vacuum : Total and Partial Photoelectron Yields for Liquid Water Near the Oxygen K-edge2009

    • Author(s)
      M. Ukai, A. Yokoya, Y. Nonaka, K. Fujii, Y. Saitoh
    • Journal Title

      Radiation Physics and Chemistry (印刷中)

    • Peer Reviewed
  • [Journal Article] The Yield, Processing, and Biological Consequences of Clustered DNA Damage Induced by Ionizing Radiation2009

    • Author(s)
      N. Shikazono, M. Noguchi, K. Fujii, A. Urushibara, A. Yokoya
    • Journal Title

      Journal of Radiation Research 50

      Pages: 27-36

    • Peer Reviewed
  • [Journal Article] Induction of Single Strand Breaks, and Base Lesions in Plasmid DNA Films Induced by Carbon, Nitrogen, and Oxygen KLL Auger Process2008

    • Author(s)
      K. Fujii, A. Yokoya, N. Shikazono
    • Journal Title

      International Journal of Radiation Biology 84

      Pages: 1104-1111

    • Peer Reviewed
  • [Journal Article] Studies of Soft X-ray-induced Auger Effect on the Induction of DNA Damage2008

    • Author(s)
      A. Yokoya, K. Fujii, N. Shikazono, K. Akamatsu, A. Urushibara, R. Watanabe
    • Journal Title

      International Journal of Radiation Biology 84

      Pages: 1069-1081

    • Peer Reviewed
  • [Journal Article] Characterization of Lesions Induced in Linear-formed Plasmid DNA by Valence Ionization and Auger Decay at Carbon, Nitrogen and Osygen2008

    • Author(s)
      K. Akamatsu, K. Fujii, A. Yokoya
    • Journal Title

      International Journal of Radiation Biology 84

      Pages: 1082-1092

    • Peer Reviewed
  • [Journal Article] DNA Damage Induced by the Direct Effect of Radiation2008

    • Author(s)
      A. Yokoya, N. Shikazono, K. Fujii, A. Urushibara, K. Akamatsu, R. Watanabe
    • Journal Title

      Radiation Physics and Chemistry 77

      Pages: 1280-1285

    • Peer Reviewed
  • [Journal Article] X-ray Absorption Spectrum for Guanine-5'-monophosphate in Water Solution in the Vicinity of the Nitrogen K-edge Observed in Free Liquid Jet in Vacuum2008

    • Author(s)
      M. Ukai, A. Yokoya, K. Fujii, Y. Saitoh
    • Journal Title

      Radiation Physics and Chemistry 77

      Pages: 1265-1269

    • Peer Reviewed
  • [Presentation] プラスミドDNAに対する高LET放射線による非DSB性多重SSB誘発の可能性2008

    • Author(s)
      横谷明徳, 鹿園直哉, 藤井健太郎
    • Organizer
      日本放射線影響学会第51回大会
    • Place of Presentation
      北九州市
    • Year and Date
      2008-11-20
  • [Presentation] X線誘発損傷に対するシリビンとその類似体のin vitroでのDNA防護効果2008

    • Author(s)
      付海英, 林銘章, 端邦樹, 室屋裕佐, 藤井健太郎, 勝村庸介, 横谷明徳, 鹿園直哉, 籏野嘉彦
    • Organizer
      日本放射線影響学会第51回大会
    • Place of Presentation
      北九州市
    • Year and Date
      2008-11-19
  • [Presentation] 軟X線照射によって乾燥プラスミドDNAに生じる分子損傷の収率2008

    • Author(s)
      藤井健太郎, 横谷明徳, 鹿園直哉
    • Organizer
      第51回放射線化学討論会
    • Place of Presentation
      つくば
    • Year and Date
      2008-10-16
  • [Presentation] Free Radical Scavenging Properties of Carnosine and Related Compounds2008

    • Author(s)
      H. Y. Fu, Y. Katusmura, M. Lin, Y. Muroya, K. Hata, K. Fujii, A. Yokoya
    • Organizer
      第51回放射線化学討論会
    • Place of Presentation
      つくば
    • Year and Date
      2008-10-16
  • [Presentation] 軟X線によってDNA分子内に生じるサイト選択的分子変化2008

    • Author(s)
      藤井健太郎, 横谷明徳, 鹿園直哉
    • Organizer
      分子科学討論会
    • Place of Presentation
      福岡
    • Year and Date
      2008-09-25
  • [Presentation] Spectral Change of X-ray Absorption Near Edge Structure of DNA Thin Films Irradiated with Monochromatic Soft X-rays2008

    • Author(s)
      K. Fujii, A. Yokoya
    • Organizer
      2nd Asia-Pasific Symposium on Radiation Chemistry
    • Place of Presentation
      東京
    • Year and Date
      2008-08-31
  • [Presentation] EPR Study of Radiation Damage to DNA Irradiated with Synchrotron Soft X-rays around Nitrogen and Oxygen K-edge2008

    • Author(s)
      A. Yokoya, K. Fujii
    • Organizer
      2nd Asia-Pasific Symposium on Radiation Chemistry
    • Place of Presentation
      東京
    • Year and Date
      2008-08-31
  • [Presentation] Synchrotron Radiation Photoelectron Studies for Primary Radiation Effects in Bio-solutions : Electron Spectra for Liquid Water and Absorption Spectra for Nucleotides in the Soft X-ray Region2008

    • Author(s)
      M. Ukai, A. Yokoya, Y. Nonaka, K. Fujii, Y. Saitoh
    • Organizer
      2nd Asia-Pasific Symposium on Radiation Chemistry
    • Place of Presentation
      東京
    • Year and Date
      2008-08-31
  • [Presentation] Lethality and Mutagenesis of E. coli Cells Irradiated with Soft X-rays2008

    • Author(s)
      T. Suzaka, N. Shikazono, K. Fujii, A. Yokoya, H. Tauchi
    • Organizer
      2nd Asia-Pasific Symposium on Radiation Chemistry
    • Place of Presentation
      東京
    • Year and Date
      2008-08-30
  • [Presentation] A Qualitative Analysis on the Yield of Radiation-induced DNA Strand Breaks in Hydrated Plasmids2008

    • Author(s)
      N. Shikazono, A. Urushibara, K. Fujii, A. Yokoya
    • Organizer
      2nd Asia-Pasific Symposium on Radiation Chemistry
    • Place of Presentation
      東京
    • Year and Date
      2008-08-29
  • [Presentation] A Photoelectron Study for DNA and its Damages in Solution using Monochromatic Soft X-rays : Total and Partial Yields of Photoelectrons for Water and Nucleotides2008

    • Author(s)
      M. Ukai, A. Yokoya, Y. Nonaka, K. Fujii, Y. Saitoh
    • Organizer
      10th International Workshop Radiation Damage to DNA
    • Place of Presentation
      Urabandai, Japan
    • Year and Date
      2008-06-10
  • [Presentation] DNA Damage Specrtra in Ultrasoft X-ray Region : Effect of Inner-shell Ionization of Carbon, Nitrogen and Oxygen Atoms on the Damage Induction2008

    • Author(s)
      K. Fujii, A. Yokoya, N. Shikazono
    • Organizer
      10th International Workshop Radiation Damage to DNA
    • Place of Presentation
      Urabandai, Japan
    • Year and Date
      2008-06-09
  • [Presentation] A Novel Technique using DNA Denaturation to Detect Prompt and Enzymatically Induced Single Strand Breaks Produced in a Clustered Damage Site2008

    • Author(s)
      A. Yokoya, N. Shikazono, A. Urushibara, K. Fujii
    • Organizer
      10th International Workshop Radiation Damage to DNA
    • Place of Presentation
      Urabandai, Japan
    • Year and Date
      2008-06-09

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Published: 2010-06-11   Modified: 2013-06-10  

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