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Cytostatic factor that released from methylmercury exposed cells

Research Project

Project/Area Number 17K15488
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Environmental and hygienic pharmacy
Research InstitutionTohoku University

Principal Investigator

Takashi Toyama  東北大学, 薬学研究科, 助教 (50720918)

Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsメチル水銀 / 細胞外放出因子 / 酸化ストレス / メタボローム / 細胞外因子 / 衛生 / ストレス
Outline of Final Research Achievements

In this study, 4-hydroperoxynonenal was identified as a candidate of cytostatic factor that released from neuronal stem cells by methylmercury. When the cells were treated with both 4-hydroxynonenal and methylmercury, effect of cell growth inhibition by methylmercury was significantly increased by co-treatment of 4-hydroxynonenal. Therefore, this factor can be a cytostatic factor that released from the cell exposed to methylmercury. In addition, it was suggested that the production of this factor is enhanced through two pathways. One is increased reactive oxygen species production associated with mitochondrial over-activation by methylmercury and the other is inhibition of glutathione peroxidase by covalent modification of Cys or seleno Cys that responsible for its activity.

Academic Significance and Societal Importance of the Research Achievements

日本人は世界的にも魚介類の摂取が多いためメチル水銀曝露量が高く、そのリスクは身近な食品衛生上の問題であるが、その毒性発現機構は不明である。これまでは、メチル水銀が直接細胞内の分子に作用することで、毒性を発揮するという考えが主流であったが、本研究成果からメチル水銀により放出細胞外に放出された4-HNEが、メチル水銀による細胞増殖抑制作用を増加させる因子として示唆された。そのため本研究はメチル水銀の全く新しい毒性発現機構の一端が示したという点で学術的に意義深い。また、本研究は将来的にメチル水銀感受性の差のバイオマーカーとして4-HNEを利用することで、社会に役立つ研究へと発展する可能性がある。

Report

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

    (5 results)

All 2018 2017

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

  • [Journal Article] Exposure to Electrophiles Impairs Reactive Persulfide-Dependent Redox Signaling in Neuronal Cells2017

    • Author(s)
      Ihara Hideshi、Kasamatsu Shingo、Kitamura Atsushi、Nishimura Akira、Tsutsuki Hiroyasu、Ida Tomoaki、Ishizaki Kento、Toyama Takashi、Yoshida Eiko、Abdul Hamid Hisyam、Jung Minkyung、Matsunaga Tetsuro、Fujii Shigemoto、Sawa Tomohiro、Nishida Motohiro、Kumagai Yoshito、Akaike Takaaki
    • Journal Title

      Chem. Res. Toxicol

      Volume: 30 Issue: 9 Pages: 1673-1684

    • DOI

      10.1021/acs.chemrestox.7b00120

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Small interfering RNA-mediated knockdown of the transcription factor TCF3 enhances sensitivity to methylmercury in mouse neural stem cells2017

    • Author(s)
      Takahashi , Wang Y, Toyama T, Kim M. S., Kuge S., Hwang G. W., Naganuma A
    • Journal Title

      Fundamental Toxicological Sciences

      Volume: 4 Issue: 2 Pages: 41-43

    • DOI

      10.2131/fts.4.41

    • NAID

      130005439338

    • ISSN
      2189-115X
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] TRPC6 counteracts TRPC3-Nox2 protein complex leading to attenuation of hyperglycemia-induced heart failure in mice2017

    • Author(s)
      Oda Sayaka、Numaga-Tomita Takuro、Kitajima Naoyuki、Toyama Takashi、Harada Eri、Shimauchi Tsukasa、Nishimura Akiyuki、Ishikawa Tatsuya、Kumagai Yoshito、Birnbaumer Lutz、Nishida Motohiro
    • Journal Title

      Scientific Reports

      Volume: 7 Issue: 1 Pages: 7511-7511

    • DOI

      10.1038/s41598-017-07903-4

    • NAID

      120007128849

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Identification of the Cytotoxicity-inducing Factors that are Released from Cells by Methylmercury2018

    • Author(s)
      Takashi TOYAMA, Gi-Wook HWANG, Akira NAGANUMA
    • Organizer
      Society of Toxicology 57th Annual Meeting and ToxExpo
    • Related Report
      2017 Research-status Report
  • [Presentation] Identification of the cytotoxic factor released from cells treated with methylmercury2017

    • Author(s)
      Takashi Toyama, Akira Naganuma and Gi-Wook Hwang
    • Organizer
      The 12th International Conference and 5th Asian Congress on Environmental Mutagens
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2020-03-30  

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