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Do changes in the tissue microenvironment induced by radiation-induced inflammatory responses affect mammary carcinogenesis?

Research Project

Project/Area Number 20K19970
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 63020:Radiation influence-related
Research InstitutionNational Institutes for Quantum Science and Technology

Principal Investigator

Nagata Kento  国立研究開発法人量子科学技術研究開発機構, 放射線医学研究所 放射線影響研究部, 研究員 (00867236)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsラット / 乳がん / 放射線 / 幹細胞 / 組織微小環境 / 乳腺 / 炎症 / 放射線影響 / 発がん / 炎症反応
Outline of Research at the Start

一般的には、放射線はDNAに損傷を与え、誤修復によって生まれる変異の蓄積が発がんにつながると考えられている。一方で、組織微小環境の変化によって発がんが誘導される可能性もある。例えば、放射線により炎症反応が誘導され、慢性的な炎症反応は変異細胞の発生・増殖を促す。
ヒト乳がんのモデルとして、ラット乳がんは有用性が高い。本研究では、炎症反応のような組織微小環境の変化がラット乳腺の発がんの線量率依存性を決定する要因となっている可能性を検討するため、発がん効果が異なることがわかっている様々な線量率において炎症反応を引き起こす細胞の特定を行い、発がんリスクの線量率依存性を炎症反応で説明することを目指す。

Outline of Final Research Achievements

This study examined whether changes in the tissue microenvironment induced by radiation-induced inflammatory responses affect mammary carcinogenesis.
We established a method to distinguish mammary epithelium cells from stromal tissue, where inflammatory cells are abundant, by using tissue sections and tissue-clearing specimens of rat mammary glands, and confirmed that inflammatory cells (CD68-positive macrophages) are present in the mammary stroma. RNA sequencing was performed to elucidate the molecular mechanisms after radiation exposure, and the data suggest that irradiation suppresses mammary epithelial cell differentiation and activates inflammatory factors. In the future, we will examine the relationship between radiation-induced inflammation and abnormal differentiation of mammary epithelial cells and how it contributes to carcinogenesis.

Academic Significance and Societal Importance of the Research Achievements

本研究では、放射線被ばく後の数週間以内の乳腺において細胞の分化や炎症について検討した。RNAシーケンスから得られたデータは放射線が乳腺上皮細胞の分化抑制、炎症反応の増大を引き起こす可能性を示唆するものであり、放射線被ばく後数週の乳がん発症前の発がんメカニズムの解明等のつながる基礎的な知見を創出した。今後のさらなるメカニズム研究により、放射線被ばく防護剤、乳がん患者に対する標的分子治療薬の開発等、社会実装に向けた基礎研究となりうる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2022 2021

All Presentation (7 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] Cellular dynamics of luminal cells in rat mammary gland after exposure to low dose-rate radiation2022

    • Author(s)
      Nagata Kento, Nishimura Mayumi, Daino Kazuhiro, Iizuka Daisuke, Nishimura Yukiko, Hattori Yuya, Yokoya Ritsuko, Yokoya Akinari, Kakinuma Shizuko, Imaoka Tatsuhiko
    • Organizer
      International Mini Workshop on Low Dose and Low Dose-Rate Radiation Research -Current Status and Future Prospects-
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Persistent suppression of the luminal progenitor cell differentiation precedes radiation-induced rat mammary carcinogenesis2022

    • Author(s)
      Nagata Kento, Nishimura Mayumi, Daino Kazuhiro, Iizuka Daisuke, Nishimura Yukiko, Hattori Yuya, Yokoya Ritsuko, Yokoya Akinari, Kakinuma Shizuko, Imaoka Tatsuhiko
    • Organizer
      第19回幹細胞シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 放射線はラット乳腺内腔細胞の分化を線量率依存的に抑制する2022

    • Author(s)
      永田健斗, 西村まゆみ, 臺野和広, 飯塚大輔, 西村由希子, 服部佑哉, 渡邊立子, 横谷明徳, 柿沼志津子, 今岡達彦
    • Organizer
      アイソトープ・放射線研究発表会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Radiation inhibits differentiation of luminal cells in the rat mammary gland in a dose-rate-dependent manner2022

    • Author(s)
      永田健斗, 西村まゆみ, 臺野和広, 飯塚大輔, 西村由希子, 服部佑哉, 渡邊立子, 横谷明徳, 柿沼志津子, 今岡達彦
    • Organizer
      日本放射線影響学会第65回大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Dynamics of DNA double-strand break repair in progenitor and mature cells of the rat mammary gland2021

    • Author(s)
      Kento Nagata, Yukiko Nishimura, Yuya Hattori, Ritsuko Watanabe, Keiji Suzuki, Shizuko Kakinuma, Tatsuhiko Imaoka
    • Organizer
      第18回幹細胞シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] Histological analysis of DNA double-strand break repair in progenitor and mature cells in rat mammary gland2021

    • Author(s)
      Kento Nagata, Mayumi Nishimura, Kazuhiro Daino, Daisuke Iizuka, Yukiko Nishimura, Yuya Hattori, Ritsuko Watanabe, Akinari Yokoya, Keiji Suzuki, Shizuko Kakinima, Tatsuhiko Imaoka
    • Organizer
      日本放射線影響学会第64回大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Radiation-induced DNA Double-strand Break Repair of Progenitor Cells in Rat Mammary Gland2021

    • Author(s)
      Kento Nagata, Mayumi Nishimura, Kazuhiro Daino, Daisuke Iizuka, Yukiko Nishimura, Yuya Hattori, Ritsuko Watanabe, Akinari Yokoya, Keiji Suzuki, Shizuko Kakinuma, Tatsuhiko Imaoka
    • Organizer
      Institute for Environmental Sciences 30th Anniversary International Symposium 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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