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Investigation of pathomechanism of cerebral microbleeds in collagen-binding protein-producing cariogenic bacteria

Research Project

Project/Area Number 21K16961
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 57020:Oral pathobiological science-related
Research InstitutionNational Cardiovascular Center Research Institute

Principal Investigator

Hattori Yorito  国立研究開発法人国立循環器病研究センター, 病院, 特任部長 (60713849)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsCnm / Stereptococcus mutans / 脳内出血 / Bリピート / 齲蝕原生細菌 / Streptococcus mutans / 脳微小出血 / 脳卒中 / 脳小血管病
Outline of Research at the Start

虫歯菌の一つであるミュータンス菌のうち,コラーゲン結合蛋白Cnmを発現するミュータンス菌の口腔内保有が,脳内出血,脳微小出血を発症させていることがわかっています.しかしながら,Cnmを有する ミュータンス菌保有者の脳内出血,脳微小出血の重症度,病変数は様々です.そこで,CnmタンパクのBリピート領域に着目したところ, Bリピート領域の伸長が脳微小出血の重症化を惹起する傾向があり,Bリピートの長さと脳内出血,脳微小出血をはじめとした脳血管障害との関連を調べていきます.

Outline of Final Research Achievements

An association between oral carriage of the cariogenic bacterium Streptococcus mutans, which expresses the collagen-binding protein Cnm, and intracerebral hemorrhage has been demonstrated, with a significantly higher number of cerebral microbleeds (CMBs) in the carriers. However, it is unclear what determines the severity of CMBs in Cnm-positive S. mutans carriers. Among 68 Cnm-positive S. mutans carriers, 12 patients with short Cnm B repeat lengths (<486 bp) had benign strains (CMBs ≦1), and among those with long B repeat lengths, 25 had malignant strains (CMBs ≧2) The results suggest that B-repeat length is associated with the severity of deep CMBs.

Academic Significance and Societal Importance of the Research Achievements

Bリピートの長短が深部CMBsの重症度と関連することが示唆され、Bリピート長の長い患者においては、より厳密な降圧療法を実施し、脳内出血の発症予防を社会的に啓発することが重要である。学術的には、Bリピート長の簡易測定法の開発、他のリピート伸長病のように核酸医薬などの開発が進むことが期待される。

Report

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

    (2 results)

All 2023 2022

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

  • [Journal Article] Harboring Cnm‐expressing <i>Streptococcus mutans</i> in the oral cavity relates to both deep and lobar cerebral microbleeds2023

    • Author(s)
      Ikeda Shuhei、Saito Satoshi...
    • Journal Title

      European Journal of Neurology

      Volume: - Issue: 11 Pages: 3487-3496

    • DOI

      10.1111/ene.15720

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Risk Assessment of Cnm-positive Streptococcus Mutans in Stroke Survivors (RAMESSES): Protocol for a Multicenter Prospective Cohort Study2022

    • Author(s)
      Satoshi Hosoki, Yorito Hattori, Satoshi Saito, Misa Takegami, Shuichi Tonomura, Yumi Yamamoto, Shuhei Ikeda, Naohisa Hosomi, Naoya Oishi, Yoshiaki Morita, Yoshihiro Miyamoto, Ryota Nomura, Kazuhiko Nakano, Masafumi Ihara
    • Journal Title

      Frontiers in Neurology

      Volume: in press

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access

URL: 

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

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