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Control mixed infections by suppressing the virulence of multiple bacteria

Research Project

Project/Area Number 20K10270
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 InstitutionNagasaki University

Principal Investigator

NISHIGUCHI MIYUKI  長崎大学, 医歯薬学総合研究科(歯学系), 助教 (10253676)

Co-Investigator(Kenkyū-buntansha) 鵜飼 孝  長崎大学, 病院(歯学系), 教授 (20295091)
近藤 好夫  長崎大学, 医歯薬学総合研究科(歯学系), 准教授 (30581954)
Project Period (FY) 2020-04-01 – 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: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords誤嚥性肺炎 / 口腔常在細菌 / 9型分泌装置 / melaninogenica / 歯周病 / 口腔常在菌 / P.melaninogenica / 9型分泌装置 / P. melaninogenica
Outline of Research at the Start

Prevotella melaninogenica は誤嚥性肺炎に関連する口腔常在細菌で、 各年齢層で検出される。P. melaninogenica は口腔感染症で認められる他、婦人科領域感染症の原因菌でもある。P. melaninogenica の9型分泌装置の変異株は赤血球凝集能、動物実験での病原性が著しく低下し、本菌の9型分泌装置と病原性との関係性が示唆された。口腔内には9型分泌装置を用いて病原性を発揮すると考えられる菌種が多く存在する。これらも含め、9型分泌装置が口腔疾患(主に歯周病)に関与しているか、分泌装置の機能抑制により病原性の制御は可能なのか、歯周病動物モデルを用いて検証する。

Outline of Final Research Achievements

We analyzed Prevotella melaninogenica, an oral commensal organism associated with aspiration pneumonia and found in newborns and the elderly. Prevotella melaninogenica is frequently isolated from specimens with oral infections and is also a causative agent of gynecological infections. Pathogenic factor secretion apparatus mutants showed markedly reduced erythrocyte aggregation ability and virulence in animal studies. We attempted to construct a mouse model of periodontal infection using this bacterium. The method of inoculation of periodontal bacteria into the oral cavity of mice, the amount of inoculum, and the number of inoculations were investigated. After inoculation with periodontal disease bacteria, maxillae of infected and uninfected groups were excised, thin sections were prepared, and HE staining and immunostaining for inflammatory cytokines were performed.

Academic Significance and Societal Importance of the Research Achievements

歯周病は糖尿病など全身疾患の重症性に関わる重大な口腔疾病である。本課題においては、歯周病感染マウスモデルの構築を行った。今後の研究において、この動物モデルを用いて、共同研究者が混合感染症における病態を観察し、どの菌の組み合わせが生体にとって組織炎症が起こりやすいのか検証する。また、本課題において静菌候補分子を得ることができており、今後この動物感染モデルを用いて、病原性抑制の可能性を検討し、歯周病や粘膜障害軽減等、臨床での応用を模索する。本研究成果は今後の歯周病に対する予防治療の確立に大いに貢献出来る成果であったと考えられる。

Report

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

    (8 results)

All 2023 2022 2021

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

  • [Journal Article] Transposon mutagenesis and genome sequencing identify two novel, tandem genes involved in the colony spreading of Flavobacterium collinsii, isolated from an ayu fish, Plecoglossus altivelis2023

    • Author(s)
      Kondo Yoshio、Ohara Kenichi、Fujii Ryoji、Nakai Yudai、Sato Chikara、Naito Mariko、Tsukuba Takayuki、Kadowaki Tomoko、Sato Keiko
    • Journal Title

      Frontiers in Cellular and Infection Microbiology

      Volume: 13 Pages: 01-16

    • DOI

      10.3389/fcimb.2023.1095919

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Biofilm Spreading by the Adhesin-Dependent Gliding Motility of Flavobacterium johnsoniae. 2. Role of Filamentous Extracellular Network and Cell-to-Cell Connections at the Biofilm Surface.2022

    • Author(s)
      Sato K.; Naya M.; Hatano Y.; Kasahata N, Kondo Y.; Sato M.; Takebe K; Naito M.; Sato C.
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Pages: 6911-6911

    • NAID

      120007168847

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Biofilm Spreading by the Adhesin-Dependent Gliding Motility of Flavobacterium johnsoniae. 1. Internal Structure of the Biofilm2021

    • Author(s)
      Sato Keiko、Naya Masami、Hatano Yuri、Kondo Yoshio、Sato Mari、Nagano Keiji、Chen Shicheng、Naito Mariko、Sato Chikara
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Issue: 4 Pages: 1894-1894

    • DOI

      10.3390/ijms22041894

    • NAID

      120006979509

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Colony spreading of the gliding bacterium Flavobacterium johnsoniae in the absence of the motility adhesin SprB2021

    • Author(s)
      Sato Keiko、Naya Masami、Hatano Yuri、Kondo Yoshio、Sato Mari、Narita Yuka、Nagano Keiji、Naito Mariko、Nakayama Koji、Sato Chikara
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 697-697

    • DOI

      10.1038/s41598-020-79762-5

    • NAID

      120006956183

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 表層タンパク質の糖鎖修飾は細菌の滑走運動とバイオフィルム形成に関与する2023

    • Author(s)
      近藤 好夫, 澤瀬 萌々, 伊藤 李香, 白倉 佳奈, 木下 莉沙子, 西口 美由季, 田上 直美
    • Organizer
      第61回日本小児歯科学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 歯ブラシ外傷にて頬部膿瘍を生じた1例(会議録)2023

    • Author(s)
      西俣 はるか, 伊藤 李香, 木下 莉沙子, 白倉 佳奈, 西口 美由季, 田上 直美
    • Organizer
      第41回日本小児歯科学会九州地方会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 滑走運動細菌 Flavobacterium collinsii のコロニー拡張2023

    • Author(s)
      佐藤 啓子、近藤 好夫、佐藤 主税、内藤 真理子、門脇 知子
    • Organizer
      歯科基礎医学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 歯周病細菌叢の病原性を抑える試み2021

    • Author(s)
      佐藤啓子、納屋昌実、近藤好夫、武部克希、内藤真理子、鈴木守、今田勝巳、石川岳 佐藤主税
    • Organizer
      第94回日本細菌学会総会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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