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Development of a non-target drug screening system using in silico prediction

Research Project

Project/Area Number 19K10679
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 58040:Forensics medicine-related
Research InstitutionThe University of Tokyo

Principal Investigator

SAKA Kanju  東京大学, 大学院医学系研究科(医学部), 技術専門職員 (30447388)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsノンターゲット薬物スクリーニング / in silico / 薬毒物データベース / 保持時間予測 / LC-QTOF-MS / ノンターゲット薬毒物スクリーニング
Outline of Research at the Start

法医薬毒物検査において実施されている“ターゲットスクリーニング”では、新規薬毒物など標準品が入手困難である場合に対応することができない。そこで、標準品がない薬毒物でも検出可能な“in silicoノンターゲット薬毒物スクリーニング”の構築を試みる。このシステムで必要な情報は化学構造式のみであり、それから得られるモノアイソトピック質量、in silico解析によって得られる予測保持時間と予測フラグメントに基づいて不明なピークを同定するシステムである。

Outline of Final Research Achievements

In this study, we attempted to build a non-target drug screening system using LC-QTOF-MS and in silico prediction, and achieved the following.
1) To simplify data analysis of blood samples with large background noise, we developed a two-dimensional search method that picks up only peaks that match both accurate mass and predicted retention time. 2) Because searching through a huge database (approximately 98 million compounds) made it difficult to narrow down candidate drugs, a drug database for forensic toxicology was created to enable more practical searches. 3) We investigated a method for retention time prediction and found that it is important to create prediction equations with a group of highly similar compounds to improve accuracy.

Academic Significance and Societal Importance of the Research Achievements

近年、法医学ではGC-MSやLC-MS/MSを用いたターゲット薬毒物スクリーニングが一般化しつつあるが、保持時間やフラグメント情報がない新規薬物に対応することができない。このような状況から、ノンターゲット薬毒物スクリーニングへの要求は世界的に高まっている。我々の研究では、LC-QTOF-MSで得られた精密質量情報に加え、精度の高い保持時間予測、フラグメント予測といったin silicoを活用することにより、化学構造式という必要最低限の情報のみで、ノンダーゲットスクリーニングを可能にした。さらに、我々独自のデータベースによって、新規薬毒物の迅速な登録及び実践での活用を可能にした。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (11 results)

All 2022 2021 2020 2019

All Journal Article (7 results) (of which Peer Reviewed: 7 results) Presentation (4 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] Simple and simultaneous quantification of cyanide, ethanol, and 1-propanol in blood by headspace GC-MS/NPD with Deans switch dual detector system2022

    • Author(s)
      Saka Kanju、Kudo Keiko、Namera Akira、Fujii Yusuke、Noritake Kanako、Torimitsu Suguru、Makino Yohsuke、Iwase Hirotaro
    • Journal Title

      Science & Justice

      Volume: 62 Issue: 2 Pages: 193-202

    • DOI

      10.1016/j.scijus.2022.02.001

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ropinirole involved in a fatal case: blood and urinary concentrations2022

    • Author(s)
      Nagasawa Sayaka、Yamaguchi Rutsuko、Saka Kanju、Torimitsu Suguru、Chiba Fumiko、Yajima Daisuke、Inokuchi Go、Motomura Ayumi、Kira Kei、Yamagishi Yoshikazu、Ogra Yasumitsu、Iwase Hirotaro
    • Journal Title

      Forensic Toxicology

      Volume: 40 Issue: 1 Pages: 173-179

    • DOI

      10.1007/s11419-021-00593-8

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of putrefaction on the quantitative analyses of diphenhydramine in blood and tissues: model experiments by the routine matrix-matched calibration method and standard addition method with different internal standards2021

    • Author(s)
      Kudo Keiko、Saka Kanju、Waters Brian、Hara Kenji、Matsusue Aya、Kashiwagi Masayuki、Kubo Shin-ichi
    • Journal Title

      Forensic Toxicology

      Volume: 39 Issue: 2 Pages: 437-450

    • DOI

      10.1007/s11419-021-00580-z

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Association between sexual activity-related death and non-prescription use of phosphodiesterase type 5 inhibitors2021

    • Author(s)
      Nagasawa Sayaka、Saka Kanju、Yamagishi Yoshikazu、Yajima Daisuke、Chiba Fumiko、Yamaguchi Rutsuko、Torimitsu Suguru、Iwase Hirotaro
    • Journal Title

      Legal Medicine

      Volume: 48 Pages: 101815-101815

    • DOI

      10.1016/j.legalmed.2020.101815

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] 法医剖検診断のための質量分析計(MS)を用いた薬毒物スクリーニングと定量検査-現在の流れと今後の方向性2020

    • Author(s)
      工藤恵子、坂幹樹、久保真一
    • Journal Title

      法医病理

      Volume: 26 Pages: 1-8

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] A Fatal Case of Poisoning with Fentanyl Transdermal Patches in Japan2019

    • Author(s)
      Nara Akina、Yamada Chiho、Saka Kanju、Kodama Takanori、Yoshida Masaki、Iwahara Kaori、Takagi Tetsuya
    • Journal Title

      Journal of Forensic Sciences

      Volume: 64 Issue: 6 Pages: 1936-1942

    • DOI

      10.1111/1556-4029.14127

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Olanzapine‐Induced Fatal Ketoacidosis with Pneumomediastinum and Subcutaneous Emphysema2019

    • Author(s)
      Torimitsu Suguru、Makino Yohsuke、Saka Kanju、Fujii Yusuke、Abe Hiroko、Chiba Fumiko、Yamaguchi Rutsuko、Iwase Hirotaro
    • Journal Title

      Journal of Forensic Sciences

      Volume: 64 Issue: 3 Pages: 930-933

    • DOI

      10.1111/1556-4029.13942

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] LC-QTOF-MS + in silico 予測を用いた血中薬毒物ノンターゲットスクリーニング法の構築2021

    • Author(s)
      坂 幹樹
    • Organizer
      薬毒物分析Webinar~薬毒物分析に悩めるあなたへ~
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 状況に応じた定量分析-レボメプロマジン-2021

    • Author(s)
      坂幹樹
    • Organizer
      第10回法医中毒研究会セミナー
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Development of a non-target drug screening system in blood using LC-QTOF-MS with in silico approachs2019

    • Author(s)
      Saka K, Nakazono Y, Kudo K, Imoto E, Iida T, Minohata T, Furuta K, Fujii Y, Makino Y, Iwase H
    • Organizer
      The 57th Annual Meeting of the International Association of Forensic Toxicologists (TIAFT2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 検出器スイッチングを用いたシアン化物、アルコール類、その他の揮発性化合物のヘッドスペースGCによる一斉分析2019

    • Author(s)
      坂幹樹, 工藤恵子, 奈女良昭, 太田瀬亮, 滝埜昌彦, 藤井祐介, 槇野陽介, 岩瀬博太郎
    • Organizer
      日本法中毒学会第38年会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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