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Fermentation products of the fungus Monascus spp. impairs the physiological activities of toxin-producing Vibrio cholerae

Research Project

Project/Area Number 20K22784
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0803:Pathology, infection/immunology, and related fields
Research InstitutionUniversity of the Ryukyus

Principal Investigator

XU JUN  琉球大学, 医学(系)研究科(研究院), 助教 (40881735)

Project Period (FY) 2020-09-11 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords紅麹菌 / コレラ菌 / 細菌運動性 / 代謝産物 / 感染抑制 / 予防対策 / 健康食品 / コレラ菌毒素
Outline of Research at the Start

致死的な下痢を起こすコレラは、グラム陰性桿菌Vibrio choleraeのうち菌体抗原O1またはO139を有し、コレラ毒素(CTx)を産生してヒトの小腸上皮細胞に付着する株(コレラ菌)が原因となる。経口的にヒトに感染したコレラ菌は、活発な運動能で小腸上部に達しそこで付着・増殖しCTxを分泌する。一方、糸状菌である紅麹菌(Monascus)は、東アジア、東南アジアおよび沖縄県において発酵食品や天然着色料として活用されている。本研究では、コレラ菌主要病原因子であるCTx分泌、運動性および細胞付着能に対する紅麹菌代謝産物の抑制効果を検討し、その機序を生物学・生物物理学的手法で解明することを試みる。

Outline of Final Research Achievements

Monascus sp are filamentous fungi used in fermented foods. They are also natural colorants and food preservatives. Certain metabolites of Monascus lower cholesterol and have other health-promoting effects in humans. In the present study, we demonstrated that the fermentation products of Monascus inhibited ATP synthesis and motility in toxigenic Vibrio cholerae. Cell tracking and rotation assays on single flagellum showed that Monascus fermentation extract (MFE) significantly impaired V. cholerae swimming by disrupting flagellar rotation. The study revealed that MFE depolarized the V. cholerae cell membrane which, in turn, lowered the membrane potential and, by extension, restricted ATP synthesis and flagellar rotation. MFE also severely hindered the motility of other pathogenic bacteria. The foregoing findings indicate that MFE could potentially preventing infection caused by multiple pathogenic bacteria as the conventional prophylaxes and slow their progression and lower mortality.

Academic Significance and Societal Importance of the Research Achievements

細菌の活動に関するエネルギー源を標的としたコレラ菌感染の新規な予防および治療戦略の開発につながる先進的な研究に発展する可能性がある。紅麹菌発酵抽出物が、予防薬として複数の病原菌によって引き起こされる感染を潜在的に防止し、それらの進行を遅らせ、死亡率および罹患率を低下させる可能性があることを示している。紅麹菌発酵抽出物および関連食品をコレラ流行地域に普及させることによって、低コストでコレラの蔓延阻止と予防対策にも役に立つ。

Report

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

    (3 results)

All 2022 2021 2020

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

  • [Journal Article] Fermentation products of the fungus Monascus spp. impairs the physiological activities of toxin-producing Vibrio cholerae2022

    • Author(s)
      Xu Jun、Arakaki Rino、Tachibana Shinjiro、Yamashiro Tetsu
    • Journal Title

      Microbiological Research

      Volume: 258 Pages: 126995-126995

    • DOI

      10.1016/j.micres.2022.126995

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Biological extracts of Monascus spp. alters the virulent factors of cholera toxin-producing Vibrio. Cholerae2021

    • Author(s)
      Jun Xu, Rino Arakaki, Shinjiro Tachibana, Tetsu Yamashiro
    • Organizer
      第94回日本細菌学会総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Biological Extracts of Monascus spp. Alters the Virulent Factors of Cholera Toxin-Producing Vibrio cholerae2020

    • Author(s)
      許駿、新垣梨乃、橘信二郎、山城哲
    • Organizer
      第94回日本細菌学会総会
    • Related Report
      2020 Research-status Report

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Published: 2020-09-29   Modified: 2023-01-30  

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