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Clarification of cell death avoidance system by radiation-induced autophagy

Research Project

Project/Area Number 15K16131
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Risk sciences of radiation and chemicals
Research InstitutionNational Institutes for Quantum and Radiological Science and Technology (2016-2019)
Japan Atomic Energy Agency (2015)

Principal Investigator

Noguchi Miho  国立研究開発法人量子科学技術研究開発機構, 量子生命科学領域, 主幹研究員(定常) (40455283)

Project Period (FY) 2015-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords放射線 / 老化 / オートファジー / X線誘発老化 / LC3 / DNA損傷応答 / 線維芽細胞 / 老化様増殖停止 / 老化様細胞増殖停止 / 長期細胞周期停止 / アポトーシスの回避
Outline of Final Research Achievements

We hipothisized that in irradiated cells, autophagy may be activated to avoid induction of apoptosis trrigerd by accumulation of the damaged proteins and dysfunctional organelles. Therefore, we investigated activity of autophagy in normal human diploid cells, hTERT BJ-5ta cells, exposed to 20 Gy X-rays. We found that irradiated cells guradually induced senescence and alomost of those cells showed senescent satete at 8 days post-irradiation. We also found that activity of autophagy was increased in response to X-irradiation from the results of LC3-II levels. These results suggested that induction of autophagy after irradiation may be involved in the elimination of damaged proteins and organelles.

Academic Significance and Societal Importance of the Research Achievements

細胞老化は細胞死による組織の縮小や発ガンを回避することが可能である一方、様々な加齢性疾患と関係があることが近年明らかになってきている。しかし、放射線治療を主眼とした放射線の細胞影響は主に細胞分裂能の喪失により評価されてきたことから、放射線照射を受けた細胞が細胞分裂能は喪失したものの老化して生存している場合の細胞の機能的評価はいまだ少ない現状にある。放射線誘発老化細胞は放射線治療後の晩期障害の発生とも大いに関係すると考えられる。そのため、放射線誘発老化細胞の生理機能の一つとして、オートファジーの活性について明らかにした成果は学術的、社会的に大きく貢献できる成果であると考えられる。

Report

(6 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (8 results)

All 2019 2018 2015

All Presentation (8 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] Molecular processes of Radiation induced autophagy and senescence of a normal human fibroblast2019

    • Author(s)
      Miho Noguchi, Tomokazu Ihara, Akinari Yokoya
    • Organizer
      日本放射線影響学会第62回大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Changes of intracellular environment and autophagy activity during senescence induction after X-ray exposure.2019

    • Author(s)
      Tomokazu Ihara, Miho Noguchi, Akinari Yokoya
    • Organizer
      日本放射線影響学会第62回大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Autophagy activity during senescence revealed by protein expression dynamics and using NV-nano-diamonds on a trial basis2019

    • Author(s)
      Tomokazu Ihara, Miho Noguchi, Akinari Yokoya, Ryuji Igarashi, Kiichi Kaminaga
    • Organizer
      第3回QST国際シンポジウム「Quantum Life Science」
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 放射線による老化誘導とオートファジーの相関2019

    • Author(s)
      伊原智一、野口実穂、横谷明徳
    • Organizer
      若手放射線生物学研究会専門研究会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 放射線がもたらす細胞老化とオートファジーの関係2019

    • Author(s)
      伊原智一、野口実穂、横谷明徳
    • Organizer
      第一回量子生命科学会若手の会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 放射線照射ストレスによる細胞老化過程と細胞内環境変化2019

    • Author(s)
      伊原智一、野口実穂、横谷明徳
    • Organizer
      量子生命科学会第1回大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 正常ヒト線維芽細胞における放射線照射後の老化誘導に伴うオートファジー活性の変動2018

    • Author(s)
      野口実穂、伊原智一、横谷明徳
    • Organizer
      日本放射線影響学会第61回大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Exposure to X-rays enhances autophagy in human fibroblast cells2015

    • Author(s)
      野口実穂、横谷明徳、鈴木啓司、藤井健太郎
    • Organizer
      15th International Congress of Radiation Research
    • Place of Presentation
      京都国際会議場(京都府京都市)
    • Year and Date
      2015-05-25
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2022-11-04  

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