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Regulation of virulence in fungi under coculture condition with anaerobic bacteria

Research Project

Project/Area Number 21K07009
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49050:Bacteriology-related
Research InstitutionOsaka Metropolitan University (2022-2023)
Osaka City University (2021)

Principal Investigator

Niki Mamiko  大阪公立大学, 大学院医学研究科, 准教授 (20438229)

Co-Investigator(Kenkyū-buntansha) 坪内 泰志  大阪公立大学, 大学院医学研究科, 准教授 (30442990)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsCandida albicans / バイオフィルム / 嫌気性菌 / クオラムセンシング / 真菌
Outline of Research at the Start

Candida albicansは免疫不全患者においては重篤な感染症を引き起こすことが問題となっている口腔内常在真菌である。また、C. albicansは他の常在細菌と共生あるいは競合しながらバイオフィルムを形成することが知られている。本研究では、口腔内偏性嫌気性菌であるPorphyromonas gingivalis の培養上清に存在するC. albicans の菌糸形成およびバイオフィルム形成を誘導する分子の同定を行うとともに刺激分子のレセプターを同定し、刺激により誘導される遺伝子を解析することでP. gingivalis-C. albicans の異種間シグナル伝達機構の解明を目指す。

Outline of Final Research Achievements

The culture supernatant of the Gram-negative anaerobic bacterium Porphyromonas gingivalis (Pg) was found to induce mycelial and biofilm formation of Candida albicans (Ca). It was also revealed that Ca treated with Pg culture supernatant induced epithelial cell damage and showed increased drug resistance, while the production of protease, one of the virulence factors of Ca, was suppressed.We also found that farnesol, an anti-biofilm quorum sensing (QS) molecule of Ca, did not inhibit biofilm formation induced by Pg culture supernatant. In addition, it was shown that autoinducer-2, known as a QS molecule of Pg, was not involved in the induction of Ca biofilm formation. By solvent extraction and molecular weight fractionation, it was confirmed that this activity is caused by a highly polar and low molecular weight molecule in the culture supernatant.

Academic Significance and Societal Importance of the Research Achievements

カンジダ症の難治化にはバイオフィルム形成による菌の感染部位への定着および薬剤抵抗性の獲得が寄与していると考えられる。口腔内常在嫌気性菌によるC. albicansバイオフィルム形成促進メカニズムの解明により、口腔カンジダ症の治療および予防法開発の一助となると考える。また、P. gingivalis とC. albicans 間のクオラムセンシング機構は報告がなく、相互作用解析により新たな異種間クオラムセンシングメカニズムの解明につながる可能性が期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (4 results)

All 2022 2021

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

  • [Journal Article] Siderophore production as a biomarker for Klebsiella pneumoniae strains that cause sepsis: A pilot study2022

    • Author(s)
      Namikawa Hiroki、Niki Makoto、Niki Mamiko、Oinuma Ken-Ichi、Yamada Koichi、Nakaie Kiyotaka、Tsubouchi Taishi、Tochino Yoshihiro、Takemoto Yasuhiko、Kaneko Yukihiro、Kakeya Hiroshi、Shuto Taichi
    • Journal Title

      Journal of the Formosan Medical Association

      Volume: 121 Issue: 4 Pages: 848-855

    • DOI

      10.1016/j.jfma.2021.06.027

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Complete Genome Sequence of a Clinical Isolate of Acinetobacter baumannii Harboring 11 Plasmids2021

    • Author(s)
      Sakiyama Arata、Matsumoto Yuki、Tsubouchi Taishi、Suzuki Masato、Niki Makoto、Niki Mamiko、Oinuma Ken-Ich、Kakeya Hiroshi、Kaneko Yukihiro
    • Journal Title

      Microbiology Resource Announcements

      Volume: 10 Issue: 39

    • DOI

      10.1128/mra.00695-21

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Complete Genome Sequence of Acinetobacter pittii OCU_Ac17, Isolated from Human Venous Blood2021

    • Author(s)
      Matsumoto Yuki、Sakiyama Arata、Tsubouchi Taishi、Suzuki Masato、Niki Makoto、Niki Mamiko、Kakeya Hiroshi、Kaneko Yukihiro
    • Journal Title

      Microbiology Resource Announcements

      Volume: 10 Issue: 39

    • DOI

      10.1128/mra.00696-21

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 真菌のバイオフィルム形成における嫌気性菌の役割2021

    • Author(s)
      仁木 満美子
    • Organizer
      第50回日本嫌気性菌感染症学会総会・学術集会
    • Related Report
      2021 Research-status Report
    • Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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