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Construction of a novel oral health indicator based on an oral microbiota culture model

Research Project

Project/Area Number 19K10456
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57080:Social dentistry-related
Research InstitutionOsaka Dental University

Principal Investigator

Mashimo Chiho  大阪歯科大学, 歯学部, 講師 (80368159)

Co-Investigator(Kenkyū-buntansha) 沖永 敏則  大阪歯科大学, 歯学部, 教授 (60582773)
南部 隆之  大阪歯科大学, 歯学部, 講師 (80367903)
Project Period (FY) 2019-04-01 – 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 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords口腔善玉菌 / 硝酸還元菌 / Rothia属細菌 / 遺伝子改変 / 口腔細菌叢 / 口腔健康 / 口腔菌叢バランス / 細菌ゲノム解析 / メタゲノム解析 / ゲノム解析
Outline of Research at the Start

健康口腔を維持するためには、特定の細菌(う蝕・歯周病病原細菌)を除去するだけではなく、口腔内の菌叢バランスが重要であることが分かってきた。しかし、口腔内の菌叢はどのような条件で変動するのかについては不明な点が多い。そこで、本研究では、我々が独自に構築した口腔菌叢を維持したままで培養できるモデル実験系[細胞レベル]と細菌叢を網羅的に解析する次世代シークエンス[遺伝子レベル]を組み合わせた新たな評価方法により、菌叢全体の変動に与える因子および共生状態における個々の細菌の役割を明らかにしていく。口腔健康増進に寄与する方向性を示していくことを目指す。

Outline of Final Research Achievements

The results of oral metagenome analysis have revealed that the activity of several bacterial species is crucial for maintaining a healthy oral state. A shared characteristic of these bacteria is their nitrate-reducing activity. They reduce nitrate ions in saliva, producing nitrite ions and nitric oxide, which have bactericidal effects. Among these, it has been found that bacteria of the Rothia spp. particularly contribute to the promotion of oral and overall health. However, due to the lack of genetic modification techniques for Rothia spp., their functions at the genetic level have not been elucidated. In this study, we isolated Rothia spp. from the oral cavity and established a foundation for genetic modification techniques. As a result, it became possible to create genetically modified strains. This enables the construction of indicators to monitor the fluctuations of oral microbiota centered around Rothia spp. at the molecular level.

Academic Significance and Societal Importance of the Research Achievements

本研究により、口腔の主な硝酸還元菌であるRothia属細菌の働きを遺伝子レベルで解析することが可能となった。体内の硝酸イオン動態は個体の健康維持に重要であり、特に、entero -salivary nitrate metabolismでは口腔細菌の働きが必須である。Rothia属細菌は口腔における高い硝酸還元活性を保有する代表菌であるので、Rothia属細菌を遺伝子レベルでコントロールすることにより、口腔の硝酸イオンを中心とした細菌叢バランスの変化を捉えるモデル実験系を確立できる。最終的には口腔硝酸還元活性と全身健康の増進の間を結ぶ指標を作る可能性ができたと考える。

Report

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

    (9 results)

All 2024 2023 2022 2021 2020 2019

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (4 results)

  • [Journal Article] Transposon insertion in Rothia dentocariosa.2024

    • Author(s)
      Boang Liu, Chiho Mashimo, Takayuki Nambu, Hugo Maruyama, Toshinori Okinaga.
    • Journal Title

      Journal of Oral Biosciences

      Volume: - Issue: 2 Pages: 358-364

    • DOI

      10.1016/j.job.2024.04.006

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effect of Brazilian propolis from the state of Bahia on oral bacteria.2023

    • Author(s)
      Hiroki Takigawa, Chiho Mashimo, Takayuki Nambu, Hugo Maruyama, Toshinori Okinaga
    • Journal Title

      Journal of Osaka Dental University

      Volume: 57 Pages: 125-129

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Inter-site and interpersonal diversity of salivary and tongue microbiomes, and the effect of oral care tablets.2021

    • Author(s)
      Maruyama H, Masago A, Nambu T, Mashimo C, Takahashi K, Okinaga T.
    • Journal Title

      F1000Research

      Volume: 9 Pages: 1477-1477

    • DOI

      10.12688/f1000research.27502.2

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Inter-site and interpersonal diversity of salivary and tongue microbiomes, and the effect of oral care tablets2020

    • Author(s)
      Hugo Maruyama, Ayako Masago, Takayuki Nambu, Chiho Mashimo, Kazuya Takahashi, Toshinori Okinaga
    • Journal Title

      F1000Research

      Volume: 9 Pages: 1477-1477

    • DOI

      10.12688/f1000research.27502.1

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nitric oxide donor modulates a multispecies oral bacterial community - an in vitro study.2019

    • Author(s)
      Takayuki Nambu, Dan Wang, Chiho Mashimo, Hugo Maruyama, Kosuke Kashiwagi, Kazushi Yoshikawa, Kazuyo Yamamoto, Toshinori Okinaga.
    • Journal Title

      Microorganisms

      Volume: 7 Issue: 9 Pages: 353-353

    • DOI

      10.3390/microorganisms7090353

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Rothia属細菌を利用した新規遺伝子改変技術の開発2023

    • Author(s)
      劉柏昂, 真下千穂, 南部隆之, 円山由郷, 沖永敏則
    • Organizer
      第65回歯科基礎医学会学術大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Transposon insersion mutagenesis in Rothia dentocariosa.2023

    • Author(s)
      B. Liu, C. Mashimo, T. Nambu, H. Maruyama, T. Okinaga.
    • Organizer
      101st General Session & Exhibition of the International Association Dental Research
    • Related Report
      2023 Annual Research Report
  • [Presentation] ブラジル連邦共和国バイーア州産プロポリスの口腔細菌への影響2022

    • Author(s)
      瀧川博樹、真下千穂、南部隆之、円山由郷、沖永敏則
    • Organizer
      第64回歯科基礎医学会学術大会
    • Related Report
      2022 Research-status Report
  • [Presentation] pH による口腔細菌叢変化についての解析2021

    • Author(s)
      黄堯, 南部隆之, 真下千穂, 円山由郷, 髙橋一也, 冲永敏則
    • Organizer
      第74回日本細菌学会関西支部総会
    • Related Report
      2021 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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