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A study to elucidate the mechanism of intracerebral heorrhage induced by collagen-binding Streptococcus mutans and to develop a novel preventive therapy

Research Project

Project/Area Number 19K22610
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 52:General internal medicine and related fields
Research InstitutionNational Cardiovascular Center Research Institute

Principal Investigator

Ihara Masafumi  国立研究開発法人国立循環器病研究センター, 病院, 部長 (00372590)

Co-Investigator(Kenkyū-buntansha) 仲野 和彦  大阪大学, 歯学研究科, 教授 (00379083)
Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2019: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Keywords脳内出血 / ミュータンス菌 / 脳微小出血 / コラーゲン / 脳出血 / 齲蝕原性細菌 / コラーゲン接着因子 / Cnm / 分子標的
Outline of Research at the Start

脳出血の病態理解は, 近年劇的に変容した.脳出血の発症には未知の因子が関与しており,その診断・治療法の開発にもパラダイムシフトが必要と考えられている.申請者らは,コラーゲン結合蛋白Cnmを産生する齲蝕原性細菌が脳出血および脳微小出血に強く相関することを見出したことから,更なる研究開発を進めることで,脳出血の分子標的予防法を開発できる可能性が高く,まずはその病態モデルを確立し,脳出血発症の機序を明らかにすることを目指す.

Outline of Final Research Achievements

We retrospectively investigated patients with stroke receiving oral microbiological examination and head 3T magnetic resonance imaging evaluations twice in the period 2014 to 2019, allowing >180-day interval.
A total of 111 patients were identified; 21 (19%) with cnm-positive S. mutans and 90 (81%) without. Clinical history, including blood pressure and the use of antithrombotic agents, were comparable between the 2 groups. New CMB were more commonly observed in patients with cnm-positive S. mutans (52% versus 23%; P=0.008). The incidence of CMB was significantly higher in the group with cnm-positive S. mutans, especially in deep areas, (incidence rate ratios [95% CI], 5.1 [1.9-13.6] for CMB in any brain region; 15.0 [5.4-42.0] for deep CMB), which persisted after adjusting for age, sex, hypertension, and renal impairment (4.7 [1.8-11.9] for CMB in any brain region; 13.9 [4.3-44.5] for deep CMB).

Academic Significance and Societal Importance of the Research Achievements

今回、cnm陽性ミュータンス菌と脳出血との関係を明らかにできたことから、脳卒中の機序の解明に寄与するものと考えられる。現在、cnm陽性ミュータンス菌によって脳出血が引き起こされるメカニズムを探索する基礎研究や、国内15施設と協力して進めている多施設前向き研究、アフリカ、東南アジアを含む世界中の他人種・地域における本菌の役割を検討する国際共同観察研究を実施している。我が国では欧米諸国と比べてまだまだ脳出血が多く、口腔内の悪玉むし歯菌を減らすために、口腔内環境を整えることが有効であると考えられる。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (12 results)

All 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (3 results) Remarks (2 results) Patent(Industrial Property Rights) (1 results)

  • [Int'l Joint Research] Southampton University/Newcastle University(英国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] National University of Singapore(シンガポール)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Oral carriage of Streptococcus mutans harboring the cnm gene is related to an increased incidence of cerebral microbleeds2020

    • Author(s)
      Hosoki S, Saito S, Tonomura S, Ishiyama H, Yoshimoto T, Ikeda S, Ikenouchi H, Yamamoto Y, Hattori Y, Miwa K, Friedland RP, Carare RO, Nakahara J, Suzuki N, Koga M, Toyoda K, Nomura R, Nakano K, Takegami M, Ihara M.
    • Journal Title

      Stroke

      Volume: 51 Issue: 12 Pages: 3632-3639

    • DOI

      10.1161/strokeaha.120.029607

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Microbiota in cerebrovascular disease: A key player and future therapeutic target2020

    • Author(s)
      Tonomura Shuichi、Ihara Masafumi、Friedland Robert P
    • Journal Title

      Journal of Cerebral Blood Flow & Metabolism

      Volume: n.d. Issue: 7 Pages: 1368-1380

    • DOI

      10.1177/0271678x20918031

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Brain Microvascular Pericytes in Vascular Cognitive Impairment and Dementia2020

    • Author(s)
      Uemura Maiko T.、Maki Takakuni、Ihara Masafumi、Lee Virginia M. Y.、Trojanowski John Q.
    • Journal Title

      Frontiers in Aging Neuroscience

      Volume: 12 Pages: 80-80

    • DOI

      10.3389/fnagi.2020.00080

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 齲歯・歯周病と脳卒中・認知症の関連(RAMESSES研究)2020

    • Author(s)
      猪原匡史,齊藤聡,服部頼都,細木聡,山本由美,殿村修一
    • Journal Title

      神経治療学

      Volume: n.d.

    • NAID

      130007981249

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 脳内出血発症における齲蝕原性細菌の病的意義2021

    • Author(s)
      猪原匡史
    • Organizer
      日本脳卒中学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 虫歯・歯周病と脳卒中・認知症の関連(RAMESSES研究)2019

    • Author(s)
      猪原匡史
    • Organizer
      日本神経治療学会学術集会
    • Related Report
      2019 Research-status Report
  • [Presentation] Collagen-binding Streptococcus mutans tied to intracerebral hemorrhage2019

    • Author(s)
      Masafumi Ihara
    • Organizer
      日本神経学会学術大会
    • Related Report
      2019 Research-status Report
  • [Remarks] 『悪玉むし歯菌』と『微小脳出血の出現』との関連を解明

    • URL

      http://www.ncvc.go.jp/pr/release/20201124_press.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] 国立循環器病研究センター 脳神経内科

    • URL

      http://www.ncvc.go.jp/hospital/section/scd/cerebrovascular/b-group.html

    • Related Report
      2019 Research-status Report
  • [Patent(Industrial Property Rights)] 被験者の脳微小出血の重症化リスクを予測する方法、脳微小出血の重症化リスクの高い被験者をスクリーニングする方法、及びそれらに用いるキット2020

    • Inventor(s)
      猪原匡史,齊藤聡,服部頼都,湯原悟志,西脇森衛
    • Industrial Property Rights Holder
      猪原匡史,齊藤聡,服部頼都,湯原悟志,西脇森衛
    • Industrial Property Rights Type
      特許
    • Filing Date
      2020
    • Related Report
      2020 Annual Research Report

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Published: 2019-07-04   Modified: 2022-01-27  

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