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The analysis of microbiota for intestinal colonization of ESBL-producing bacteria

Research Project

Project/Area Number 20K08843
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 54030:Infectious disease medicine-related
Research InstitutionNagasaki University

Principal Investigator

Yanagihara Katsunori  長崎大学, 医歯薬学総合研究科(医学系), 教授 (40315239)

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 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsディスバイオーシス / 腸内細菌科細菌 / マイクロバイオーム / 肺炎桿菌 / dysbiosis / 薬剤耐性菌 / ESBL / ESBL産生細菌 / ST131 / 接合伝達実験 / ESBL産生菌 / ESBL産生腸内細菌
Outline of Research at the Start

大腸菌や肺炎桿菌に代表されるグラム陰性腸内細菌科細菌は、重篤な感染症を引き起こす。近年、薬剤耐性菌は増加傾向であり、特に、基質特異性拡張型β-ラクタマーゼ(extended-spectrum β- lactamase:ESBL)産生菌は大きな問題となっている。ESBL産生腸内細菌は、2000年以降急速に増加し、様々な感染対策を講じても効果が認められないため、従来とは異なる新しい感染制御法が必要と考えられる。薬剤耐性菌の定着や排除において腸内細菌叢は大きな役割を果たす。
本研究の目的は、①ESBLが定着しにくい腸内細菌叢を明らかにし、②腸内環境整備に基づく新たな感染制御法を確立することである。

Outline of Final Research Achievements

Pretreatment of the mouse intestinal environment with antimicrobials induces “dysbiosis”, a disturbance of the bacterial flora, and the establishment of clinical isolates of ESBL-producing bacteria. Intestinal contents are cultured on selective media containing antimicrobials for identification and quantification of bacterial species. Fecal samples from the settled and target groups were collected for identification of the constituent bacterial species and analysis of species composition. It was shown that induction of dysbiosis of the intestinal microflora with antimicrobial agents affects the establishment of drug-resistant bacteria (ESBL-E.coli). It was suggested that some constituent bacterial groups of the gut microbiota are involved in the resistance of ESBL-E.coli to colonization. These results indicate that the microbiome can be a useful tool for deterring the establishment of resistant bacteria.

Academic Significance and Societal Importance of the Research Achievements

大腸菌や肺炎桿菌などの腸内細菌科細菌は、近年増加傾向にあり、通常の感染対策では効果が乏しい。腸内に定着するこれらの菌をコントロールすることは難しい。本研究では、マイクロバイオームを活用した耐性菌の定着抑止が可能であることを明らかになった。これは、薬剤耐性腸内細菌科細菌の新しい制御法につながるものである。AMR(薬剤耐性菌)は世界的に問題になっており、解決すべき課題である。本研究成果が対策の一助になることが期待される。

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

    (5 results)

All 2023 2022

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (1 results)

  • [Journal Article] Clinical and microbiological characteristics of bloodstream infection caused by Klebsiella pneumoniae harboring rmpA in Japanese adults.2023

    • Author(s)
      Kikuchi S, Kosai K, Ota K, Mitsumoto-Kaseida F, Sakamoto K, Hasegawa H, Izumikawa K, Mukae H, Yanagihara K.
    • Journal Title

      Sci Rep.

      Volume: 13 Issue: 1 Pages: 6571-6571

    • DOI

      10.1038/s41598-023-33265-1

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Epidemiological analysis and antimicrobial susceptibility profile of Gram-negative bacilli that cause bacteremia in Japan2023

    • Author(s)
      Kosai Kosuke、Yamagishi Yuka、Mikamo Hiroshige、Ishii Yoshikazu、Tateda Kazuhiro、Yanagihara Katsunori
    • Journal Title

      Journal of Infection and Chemotherapy

      Volume: 29 Issue: 12 Pages: 1091-1096

    • DOI

      10.1016/j.jiac.2023.08.012

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Diagnostic Performance of BD Phoenix CPO Detect Panels for Detection and Classification of Carbapenemase-Producing Gram-Negative Bacteria2023

    • Author(s)
      Murata Mika、Kosai Kosuke、Akamatsu Norihiko、Matsuyama Yumiko、Oda Mitsuharu、Wakamatsu Atsushi、Izumikawa Koichi、Mukae Hiroshi、Yanagihara Katsunori
    • Journal Title

      Microbiology Spectrum

      Volume: 11 Issue: 3

    • DOI

      10.1128/spectrum.00897-23

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Escherichia coli ST131 isolated from urological patients can acquire plasmid-mediated extended spectrum β-lactamase from other bacteria with high frequency2022

    • Author(s)
      Kondo T, Sakamoto K, Morinaga Y, Miyata Y, Yanagihara K, Sakai H.
    • Journal Title

      Int J Urol.

      Volume: - Issue: 6 Pages: 587-594

    • DOI

      10.1111/iju.14845

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 薬剤耐性菌感染症のリスク低下に向けた新しい制御法の確立2022

    • Author(s)
      村田美香、森永芳智、柳原克紀
    • Organizer
      第69回 日本臨床検査医学会学術集会
    • Related Report
      2022 Research-status Report

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

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