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Comprehensive research of oral bacterial adaptation to antimicrobial agents

Research Project

Project/Area Number 19K19023
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 57030:Conservative dentistry-related
Research InstitutionOsaka University

Principal Investigator

HIROSE NANAKO  大阪大学, 歯学部附属病院, 医員 (10780819)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords薬剤耐性
Outline of Research at the Start

近年、新たな薬剤耐性菌の出現とその拡大が医療上の大きな問題となっているが、歯科領域で使用される抗菌成分に対する口腔細菌の薬剤耐性の獲得についてはまだ十分に解明されていない。そこで本研究では、実際に口腔内で使用されている抗菌成分を対象に、口腔細菌の薬剤耐性獲得の有無を検討するとともに、その耐性獲得機構を詳細に解析することを目的とする。すなわち、クロルヘキシジン、塩化セチルピリジニウム、ホウ酸イオン等に対する代表的な2種の口腔細菌の耐性獲得の有無についてmicro dilution assay法によって検討し、耐性獲得を示す口腔細菌に対して遺伝子発現解析を行うことで、耐性獲得機構の解明を目指す。

Outline of Final Research Achievements

In this study, the possibility of evolution of resistance to chlorhexidine, cetylpyridinium chloride, borate and fluoride ions in Streptococcus mutans and Enterococcus faecalis was assessed. The result indicated that repeated exposure to chlorhexidine led to resistance of E. faecalis. In CHX-adapted E. faecalis, the gene expressions related to DNA transcription and cellular stress response were upregulated, whereas those related to synthesis of aminoacyl tRNA were downregulated. It is likely that these changes of gene expressions are related to the acquisition of resistance to chlorhexidine in E. faecalis.

Academic Significance and Societal Importance of the Research Achievements

近年、新たな薬剤耐性菌の出現とその拡大が大きな問題となっているが、歯科領域で使用される抗菌成分に対する口腔細菌の薬剤耐性獲得に関しては、十分に検討されているとは言えないのが現状である。本研究では、クロルヘキシジンに連続暴露することでE.faecalisが耐性を獲得することが示されたが、E. faecalisの他の菌株や他菌種を対象としてクロルヘキシジンに対する耐性獲得の有無に関する更なる検証が必要であると考えている。これらの研究を通じて、口腔細菌の耐性獲得やそのメカニズムを解明することができれば、耐性菌克服の切り札となり得る新たな歯科用薬剤の開発に繋がるものと期待される。

Report

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

    (4 results)

All 2020 2019

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

  • [Journal Article] Development of novel surface coating composed of MDPB and MPC with dual functionality of antibacterial activity and protein repellency2020

    • Author(s)
      Thongthai Pasiree、Kitagawa Haruaki、Kitagawa Ranna、Hirose Nanako、Noree Susita、Iwasaki Yasuhiko、Imazato Satoshi
    • Journal Title

      Journal of Biomedical Materials Research Part B: Applied Biomaterials

      Volume: 108 Issue: 8 Pages: 3241-3249

    • DOI

      10.1002/jbm.b.34661

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Evaluation of physical properties of fiber-reinforced composite resin2020

    • Author(s)
      Suzaki Naoko、Yamaguchi Satoshi、Hirose Nanako、Tanaka Ryousuke、Takahashi Yusuke、Imazato Satoshi、Hayashi Mikako
    • Journal Title

      Dental Materials

      Volume: 36 Issue: 8 Pages: 987-996

    • DOI

      10.1016/j.dental.2020.04.012

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Influence of a MDPB-containing disinfectant on bonding of universal adhesives2019

    • Author(s)
      Hirose Nanako, Kitagawa Ranna, Kitagawa Haruaki, Pasiree Thongthai, Hayashi Mikako, Haapasalo Markus, Imazato Satoshi.
    • Organizer
      2019 IADR General Session
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Antibacterial effects and bonding abilities of chlorhexidine-containing self-adhesive resin cement2019

    • Author(s)
      Ranna Kitagawa, Haruaki Kitagawa, Nanako Hirose, Ririko Tsuboi, Tomoki Kohno, Mikako Hayashi, Satoshi Imazato.
    • Organizer
      4th meeting of the IADR APR (Asia Pacific Region) 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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