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Research regarding mechanism of oral colonization of Streptococcus mutans associated with systemic disease development

Research Project

Project/Area Number 20K18777
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 57070:Developmental dentistry-related
Research InstitutionOsaka University

Principal Investigator

Otsugu Masatoshi  大阪大学, 歯学研究科, 助教 (40803086)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsミュータンスレンサ球菌 / 感染性心内膜炎 / コラーゲン結合タンパク / 定着メカニズム / 予防
Outline of Research at the Start

これまでに、う蝕病原性細菌のうち菌体表層にコラーゲン結合タンパクを発現しているミュータンスレンサ球菌(CBP陽性株)が感染性心内膜炎の病原性に関与していることを明らかにした。最近になって、CBP陽性株は脳内微小出血やIgA腎症などの全身疾患に関与することも明らかにされてきている。一方で、ミュータンスレンサ球菌は養育者と子の間で伝播する傾向が強いとはされているが、CBP陽性株の伝播については検討されていない。本研究では、CBP陽性株の伝播および定着メカニズムを授乳習慣の観点から検討し、母乳由来の抗菌活性物質が示す抗菌効果を明らかにするとともにCBP陽性株の分子生物学的特性について分析する。

Outline of Final Research Achievements

In this study, the mechanism of colonization of CBP-positive Streptococcus mutans, which expresses a collagen-binding protein on the bacterial surface layer, was investigated in terms of oral bacterial colonization during infancy and its association with breastfeeding practices. Saliva samples from 100 pairs of mothers and their children were collected, then collagen-binding gene (cnm, cbm) detection was performed by PCR with DNA extraction. Overall, the mothers showed a higher CBP-positive rate as compared to the children. Notably, the possession rate of CBP-positive strains in the children was significantly higher in those whose mother also possessed a CBP-positive strain as compared to those whose mother had no such strain. Also, children possessing CBP-positive strains had a significantly shorter breastfeeding period as compared to those without CBP-positive results.

Academic Significance and Societal Importance of the Research Achievements

う蝕病原性細菌のうち菌体表層にコラーゲン結合タンパクを発現しているミュータンスレンサ球菌(CBP陽性株)は、感染性心内膜炎や脳内微小出血などの全身疾患に関与することを明らかにしてきた。一方で、これらの予防法については明確に確立できておらず、CBP陽性株を口腔内に定着させないことが根本的な予防策といえる。本研究により、CBP陽性株の主要な感染源や口腔内の定着に影響を及ぼす因子を明らかにすることができた。本研究成果は、予防法が確立していない全身疾患において、口腔領域から予防法を提唱するための一途となると考えられる。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (5 results)

All 2022 2021 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Evaluation of the collagen-binding properties and virulence of killed Streptococcus mutans in a silkworm model2022

    • Author(s)
      Suehiro Y, Nomura R, Matayoshi S, Otsugu M, Iwashita N,Nakano K.
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 2800-2800

    • DOI

      10.1038/s41598-022-06345-x

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Collagen-binding properties of Streptococcus mutans killed by amoxicillin.2021

    • Author(s)
      Suehiro Y, Matayoshi S, Otsugu M, Nomura R, Nakano K.
    • Organizer
      69th Annual Meeting of Japanese Association for Dental Research
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 死菌処理したStreptococcus mutansの感染性心内膜炎に対する病原性の評価2021

    • Author(s)
      末廣雄登, 又吉紗綾, 大継將寿, 野村良太, 仲野和彦.
    • Organizer
      第59回日本小児歯科学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 死菌処理したStreptococcus mutans のカイコモデルにおける病原性の評価2021

    • Author(s)
      末廣雄登, 又吉紗綾, 大継將寿, 野村良太, 仲野和彦.
    • Organizer
      第40回日本小児歯科学会近畿地方会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Association of breastfeeding duration with mother-to-child transmission of Streptococcus mutans strains with collagen-binding activity2020

    • Author(s)
      Otsugu M, Kitamura T, Nomura R, Nakano K
    • Organizer
      67th Congress of the European Organisation for Caries Research
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2023-01-30  

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