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Increase in severity of Streptococcus infections through liver, skin and kidney linkages

Research Project

Project/Area Number 21K07002
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49050:Bacteriology-related
Research InstitutionKyoto University (2023)
Kanazawa University (2021-2022)

Principal Investigator

Kohei Ogura  京都大学, 農学研究科, 准教授 (00586612)

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: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsレンサ球菌 / 病原因子 / 感染モデル / 遺伝子発現 / 溶血性レンサ球菌 / 流行型 / 臨床分離株 / 発現解析 / 腎臓 / 皮膚 / 細菌感染 / 重症化
Outline of Research at the Start

高齢者や基礎疾患保有患者に対して高い病原性を示すある種のレンサ球菌について、本菌が感染後体内で増殖し、多臓器への障害を引き起こすメカニズムの解明を目的とした研究を遂行する。具体的には、種々の動物モデル(肝疾患・皮膚疾患・糖尿病)を使用した感染実験や細胞株やヒト血液を用いた細菌学的・分子生物学的なアプローチにより、宿主体内での本菌の挙動を明らかにする。

Outline of Final Research Achievements

Infections caused by Streptococcus dysgalactiae subsp. equisimilis (SDSE) have been increasingly reported in elderly individuals and those with underlying conditions, surpassing the incidence of other β-hemolytic streptococci. This research project focused on SDSE as a causative agent of severe infections, including fulminant hemolytic streptococcal disease (STSS).
We confirmed that CC17 type SDSE, the most prevalent type in Japan, exhibits strong adhesive properties in the presence of human serum components. Comprehensive gene expression analysis revealed the expression of genes encoding ciliogenesis-related proteins in serum-containing culture medium.
Analysis of the CC25 type SDSE prevalent in Japan revealed that two CC25 type SDSE strains with highly similar genome sequences (over 99.5%) express a toxin highly pathogenic to blood in significantly different amounts. Transcriptome analysis of both SDSE strains was conducted with the support of PAGS.

Academic Significance and Societal Importance of the Research Achievements

SDSEは、基礎研究による報告に比して臨床報告が非常に多く、近年では侵襲性SDSE感染症とアルコールによる肝疾患との関連が示唆されている。これらの疫学的研究は、SDSE感染症が肝臓や腎臓等の組織が連関して重症化するという仮説を支持するものであると言える。さらに、SDSEは高齢者や基礎疾患保有患者に対して強い病原性を発揮するが、迅速かつ適切な処置がなされない場合には若年者に対しても劇症型の症状を引き起こすことが多数報告されている。SDSEの重症化機構の詳細を明らかにすることで、SDSEのみならず劇症型レンサ球菌感染症全体の研究に貢献することができる。

Report

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

    (14 results)

All 2024 2023 2022 2021

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 6 results) Presentation (8 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] Oral microbiome changes associated with the menstrual cycle in healthy young adult females2023

    • Author(s)
      Yamazaki Ayaka、Ogura Kohei、Minami Kana、Ogai Kazuhiro、Horiguchi Tomomi、Okamoto Shigefumi、Mukai Kanae
    • Journal Title

      Frontiers in Cellular and Infection Microbiology

      Volume: 13 Pages: 1119602-1119602

    • DOI

      10.3389/fcimb.2023.1119602

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Potential biomarker proteins for aspiration pneumonia detected by shotgun proteomics using buccal mucosa samples: a cross-sectional case?control study2023

    • Author(s)
      Ogura Kohei、Endo Maho、Hase Takashi、Negami Hitomi、Tsuchiya Kohsuke、Nishiuchi Takumi、Suzuki Takeshi、Ogai Kazuhiro、Sanada Hiromi、Okamoto Shigefumi、Sugama Junko
    • Journal Title

      Clinical Proteomics

      Volume: 20 Issue: 1 Pages: 9-9

    • DOI

      10.1186/s12014-023-09398-w

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Impact of gut microbiome on dyslipidemia in japanese adults: Assessment of the Shika-machi super preventive health examination results for causal inference2022

    • Author(s)
      Miyajima Yuna、Karashima Shigehiro、Ogai Kazuhiro、Taniguchi Kouki、Ogura Kohei、Kawakami Masaki、Nambo Hidetaka、Kometani Mitsuhiro、Aono Daisuke、Demura Masashi、Yoneda Takashi、Tsujiguchi Hiromasa、Hara Akinori、Nakamura Hiroyuki、Okamoto Shigefumi
    • Journal Title

      Frontiers in Cellular and Infection Microbiology

      Volume: 12 Pages: 908997-908997

    • DOI

      10.3389/fcimb.2022.908997

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Interspecies Regulation Between Staphylococcus caprae and Staphylococcus aureus Colonized on Healed Skin After Injury2022

    • Author(s)
      Ogura Kohei、Furuya Hiroka、Takahashi Natsuki、Shibata Kana、Endo Maho、Watanabe Shinya、Cui Longzhu、Miyoshi-Akiyama Tohru、Okamoto Shigefumi、Ogai Kazuhiro、Sugama Junko
    • Journal Title

      Frontiers in Microbiology

      Volume: 13 Pages: 999-999

    • DOI

      10.3389/fmicb.2022.818398

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Predominance of ST8 and CC1/spa-t1784 methicillin-resistant Staphylococcus aureus isolates in Japan and their genomic characteristics2022

    • Author(s)
      Ogura Kohei、Kaji Daiki、Sasaki Masakazu、Otsuka Yoshihito、Takemoto Norihiko、Miyoshi-Akiyama Tohru、Kikuchi Ken
    • Journal Title

      Journal of Global Antimicrobial Resistance

      Volume: 28 Pages: 195-202

    • DOI

      10.1016/j.jgar.2022.01.011

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A novel endoplasmic stress mediator, Kelch domain containing 7B (KLHDC7B), increased Harakiri (HRK) in the SubAB-induced apoptosis signaling pathway2021

    • Author(s)
      Yahiro Kinnosuke、Ogura Kohei、Tsutsuki Hiroyasu、Iyoda Sunao、Ohnishi Makoto、Moss Joel
    • Journal Title

      Cell Death Discovery

      Volume: 7 Issue: 1 Pages: 360-360

    • DOI

      10.1038/s41420-021-00753-0

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 国内流行型G群レンサ球菌Streptococcus dysgalactiaeが有する遺伝子発現機構2024

    • Author(s)
      木ノ嶋航司、小倉康平、北村仁美、彼谷裕康、中村雅俊、岡本成史
    • Organizer
      第35回日本臨床微生物学会総会・学術集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 溶血性レンサ球菌によるヒアルロン酸資化機構とそれに伴う病原性発揮機構2023

    • Author(s)
      小倉康平
    • Organizer
      日本応用糖質科学会第49回近畿支部会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 国内流行型β溶血性レンサ球菌Streptococcus dysgalactiae の生化学的・遺伝子的特徴2023

    • Author(s)
      木ノ嶋航司、小倉康平、北村仁美、彼谷裕康、中村雅俊、岡本成史
    • Organizer
      第60回日本細菌学会中部支部総会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 誤嚥性肺炎発症を検出する宿主側タンパク質マーカーの探索2023

    • Author(s)
      小倉康平、遠藤真穂、長谷剛志、土屋晃介、鈴木健之、大貝和裕、岡本成史
    • Organizer
      第34回日本臨床微生物学会総会・学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] 小倉康平,古屋紘花,高橋夏樹,岡本成史,大貝 和裕,須釜 淳子2023

    • Author(s)
      ヒト皮膚に常在するStaphylococcus caprae の病原性スイッチ
    • Organizer
      第96回日本細菌学会総会
    • Related Report
      2022 Research-status Report
  • [Presentation] 瘢痕部に定着するStaphylococcus aureusならびに Staphylococcus caprae2023

    • Author(s)
      小倉康平、古屋紘花、高橋夏樹、岡本成史、大貝和裕
    • Organizer
      第95回日本細菌学会総会
    • Related Report
      2021 Research-status Report
  • [Presentation] Skin physiology and two staphylococci associated with the recurrence of pressure injuries2022

    • Author(s)
      Kohei Ogura, Hiroka Furuya, Natsuki Takahashi, Shigefumi Okamoto, Kazuhiro Ogai, Junko Sugama
    • Organizer
      Skin Ageing & Challenges 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 褥瘡瘢痕部に定着するブドウ球菌属細菌2022

    • Author(s)
      小倉康平、高橋夏樹、古屋紘花、大貝和裕、岡本成史、須釜淳子
    • Organizer
      第51回日本創傷治癒学会
    • Related Report
      2021 Research-status Report

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

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