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Elucidation of the onset mechanism of periodontal disease triggered by oral bacterium Capnocytophaga

Research Project

Project/Area Number 18K09608
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57030:Conservative dentistry-related
Research InstitutionTokyo Dental College

Principal Investigator

Kikuchi Yuichiro  東京歯科大学, 歯学部, 講師 (30410418)

Co-Investigator(Kenkyū-buntansha) 石原 和幸  東京歯科大学, 歯学部, 教授 (00212910)
柴山 和子  東京歯科大学, 歯学部, 講師 (60408317)
国分 栄仁  東京歯科大学, 歯学部, 講師 (70453785)
Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords歯周病原細菌 / Capnocytophaga ochracea / 転写因子 / OxyR / 酸化ストレス / Streptococcus gordonii / Sod / AhpC / シグマ因子 / ECFシグマ因子 / 歯周病 / 歯周病原性細菌 / カプノサイトファガ属 / トリガー細菌
Outline of Final Research Achievements

To analyze the function of the transcription factor OxyR protein of the periodontopathogenic bacterium Capnocytophaga ochracea, a gene insertion mutant strain was generated. Biofilm levels were measured in co-culture using Streptococcus gordonii, an oral Streptococcus belonging to the initial settlement group on the tooth surface, wild type of C. ochracea, and the mutant strain with the inserted OxyR protein gene. The results showed that the OxyR of C. ochracea played an important role in avoiding the effect of hydrogen peroxide produced by S. gordonii. We also confirmed that OxyR regulates the transcription of Sod and AhpC proteins, which are under the control of OxyR, to eliminate oxidative stress.

Academic Significance and Societal Importance of the Research Achievements

C. ochracea は教科書においては歯周病原細菌とされている。しかし、その根拠は現状にて乏しいのが現実である。よって本研究は、C. ochracea は歯周病を誘発するトリガー細菌であるか否かについて、歯周病原細菌の生存に有利な環境構築解明という目的にて細菌学的アプローチを試みた。その結果から、C. ochracea が保有する「転写因子OxyR」がC. ochraceaが口腔内での歯面に形成するバイオフィルム形成の初期にて、重要な役割を果たすことを証明したので、学術的および社会的意義が深いと考える。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results)

  • [Journal Article] OxyR inactivation reduces the growth rate and oxidative stress defense in Capnocytophaga ochracea2021

    • Author(s)
      Yuichiro Kikuchi, Kazuko Okamoto-Shibayama, Eitoyo Kokubu, Kazuyuki Ishihara
    • Journal Title

      Anaerobe

      Volume: 72 Pages: 102466-102466

    • DOI

      10.1016/j.anaerobe.2021.102466

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 口腔細菌 Capnocytophaga ochracea OxyR変異株の性状解析2020

    • Author(s)
      菊池有一郎、柴山和子、国分栄仁、石原和幸
    • Organizer
      日本細菌学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 口腔細菌カプノサイトファガの OxyR 変異株作製2019

    • Author(s)
      菊池有一郎、柴山和子、国分栄仁、石原和幸
    • Organizer
      歯科基礎医学会
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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