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Multiple Applications of Food Additives with Antimicrobial Activity against Spores and Nutrient-Type Cells of Bacillus anthracis and Bacillus cereus.

Research Project

Project/Area Number 19K05890
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 38050:Food sciences-related
Research InstitutionNational Institute of Infectious Diseases

Principal Investigator

OKUTANI AKIKO  国立感染症研究所, 獣医科学部, 室長 (60392320)

Project Period (FY) 2019-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords芽胞発芽制御 / 炭疽菌 / 炭疽菌芽胞 / セレウス菌芽胞 / 発芽抑制 / 増殖抑制 / 甘草抽出物 / セレウス菌 / 芽胞 / 食品添加物
Outline of Research at the Start

炭疽菌は重篤な人獣共通感染症の起因菌であり、生物テロの細菌兵器として社会的に重大な脅威を引き起こしてきた。炭疽菌はまた、食中毒や院内感染の起因菌であるセレウス菌と遺伝学的に近縁であり共通の病原性遺伝子も保持している。炭疽菌・セレウス菌の芽胞に汚染された土壌中の長期間の芽胞汚染や、院内感染セレウス菌への感染防御対策は動物・公衆衛生の両領域において重要な課題である。本研究では、耐熱性芽胞菌の発育制御のため使用されている食品添加物を用いて、炭疽菌・セレウス菌の芽胞からの発芽抑制と栄養型細胞の増殖抑制活性の作用機序を遺伝子レベルで明らかにすることを目指す。

Outline of Final Research Achievements

The ability of the food additives glycine, liquorice extract and L- and D-amino acids to inhibit the germination of Bacillus anthracis spores and the growth of vegetative cells was confirmed. A Bacillus anthracis vaccine strain 34F2 spore solution was inoculated into Muller Hinton broth, which was then shaken at 37°C while the OD600 was measured over time. Glycine and licorice extract were found to reduce the absorbance at the time of spore germination, and to prevent proliferation after 24 hours. This indicates that they have both germination- and growth-inhibiting effects. Of the L-amino acids tested, L-alanine had the strongest germination-promoting effect. Although partial germination inhibition was observed with D-amino acids, both L- and D-amino acids promoted the growth of vegetative cells after 24 hours.

Academic Significance and Societal Importance of the Research Achievements

この研究では、身近な食品添加物(グリシン、甘草抽出物)が炭疽菌という危険な細菌の芽胞(休眠状態の菌)の発芽を防ぎ、増殖も抑制することを発見しました。炭疽菌は生物兵器としても懸念される病原菌ですが、日常的に使用される安全な食品添加物で対策できる可能性が示されました。この知見は、食品保存技術の向上や、万が一の生物テロ対策における新しい防御手段の開発につながる重要な発見といえます。安全で入手しやすい物質による感染症対策の可能性を示した点で、学術的にも社会的にも大きな意義があります。

Report

(7 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2025 2024 2023

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (1 results) (of which Invited: 1 results) Book (3 results)

  • [Journal Article] Genetic diversity and virulence of Bacillus cereus group isolates from bloodstream infections.2025

    • Author(s)
      Akiko Okutani, Shu Okugawa, Fumie Fujimoto, Mahoko Ikeda, Takeya Tsutsumi, Kyoji Moriya, and Ken Maeda.
    • Journal Title

      Microbiology Spectrum

      Volume: 13 Issue: 3

    • DOI

      10.1128/spectrum.02407-24

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Green tea catechin epigallocatechin gallate inhibits vegetative cell outgrowth and expression of beta-lactamase genes in penicillin-resistant Bacillus anthracis strain PCr2024

    • Author(s)
      Akiko Okutani, Shigeru Morikawa and Ken Maeda
    • Journal Title

      Pathogens

      Volume: 13 Issue: 8 Pages: 699-699

    • DOI

      10.3390/pathogens13080699

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Draft genome sequence including the capsule operon of a Bacillus cereus strain isolated from a patient with bacteremia in Japan2024

    • Author(s)
      Akiko Okutani, Shu Okugawa, Fumie Fujimoto, Mahoko Ikeda, Takeya Tsutsumi, Kyoji Moriya, and Ken Maeda
    • Journal Title

      Microbiology Resource Announcements.

      Volume: 15 Issue: 2

    • DOI

      10.1128/mra.00766-23

    • Related Report
      2024 Annual Research Report 2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Draft genome sequence of Yersinia pseudotuberculosis isolated from a wild rat in Japan2024

    • Author(s)
      Akiko Okutani, Masakatsu Taira, Shun Iida, Eun-Sil Park, Mikuni Tokuyoshi, Yuya Watari, Tadaki Suzuki, and Ken Maeda.
    • Journal Title

      Microbiology Resource Announcements.

      Volume: 10 Issue: 5

    • DOI

      10.1128/mra.01269-23

    • Related Report
      2024 Annual Research Report 2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Lethal severe fever with thrombocytopenia syndrome virus infection causes systemic germinal centre failure and massive T cell apoptosis in cats2024

    • Author(s)
      Sakai Y, Mura S, Kuwabara Y, Kagimoto S, Sakurai M, Morimoto M, Park Es, Shimojima Mi, Nagata N, Ami Y, Yoshikawa Ti, Iwata-Yoshikawa N, Fukushi S, Watanabe S, Kurosu T, Okutani A, Kimura M, Imaoka K, Saijo M, Morikawa S, Suzuki T, Maeda K
    • Journal Title

      Frontiers in Microbiology

      Volume: 5 Pages: 1333946-1333946

    • DOI

      10.3389/fmicb.2023.1333946

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 炭疽菌等の全ゲノム配列を用いた疫学的研究 感染研・獣医科学部での事例紹介2024

    • Author(s)
      奥谷晶子
    • Organizer
      第167回日本獣医学会学術集会 公衆衛生分科会シンポジウム
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Book] 獣医公衆衛生学2024

    • Author(s)
      獣医公衆衛生学教育研修協議会
    • Total Pages
      496
    • Publisher
      文栄堂出版
    • ISBN
      9784830032899
    • Related Report
      2024 Annual Research Report
  • [Book] 獣医公衆衛生学2024

    • Author(s)
      奥谷晶子
    • Total Pages
      496
    • Publisher
      文栄堂出版
    • ISBN
      4830032898
    • Related Report
      2023 Research-status Report
  • [Book] Molecular Medical Microbiology, 3rd Edition.2023

    • Author(s)
      岡本陽、奥谷晶子
    • Total Pages
      3524
    • Publisher
      Elsevier
    • ISBN
      9780128186190
    • Related Report
      2023 Research-status Report

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Published: 2019-04-18   Modified: 2026-01-16  

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