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Type 2 diabetes mellitus as a periodontitis-related systemic disease and analysis of its pathogenesis mechanism

Research Project

Project/Area Number 19K19005
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Manami Nakasato  岩手医科大学, 歯学部, 助教 (10823841)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
KeywordsP.gingivalis / 糖尿病 / DPP4 / P. gingivalis / DDP4 / 歯周炎
Outline of Research at the Start

歯周炎は2型糖尿病のリスクファクターと示唆されているものの,その分子機構はいまだ明らかではない.2型糖尿病の病態形成機序の1つとして,ジペプチジルペプチダーゼ4(DPP4)によるインクレチンの不活性化がある.申請者はP. gingivalis をはじめとする複数のヒト慢性歯周炎の主要原因細菌種がDPP4 を保有し,ヒトDPP4同様にインクレチンを切断することを明らかにした.しかし,歯周組織局所の病態が2型糖尿病の病態形成と進行に関わるかは明確ではない.本研究では歯周病原細菌の感染による歯周炎モデルマウスを作製し,局所の歯周病原細菌感染がインクレチン切断に演じる役割について検討する.

Outline of Final Research Achievements

Porphyromonas gingivalis, a Gram-negative anaerobes, is important pathogen associated with chronic periodontitis. And this bacterium is closely related to systemic diseases, such as type 2 diabetes mellitus. We previously demonstrated more direct involvement, as P. gingivalis dipeptidyl-peptidase (DPP)4 was shown to degrade incretin peptides, resulting in elevation and prolongation of postprandial hyperglycemia in a mouse model. In this study, we assessed whether other DPPs could degrade incretins as same as DPP4. P. gingivalis DPP7 has more potent hydrolyzing activity toward incretins and other gastrointestinal peptides than DPP4. In addition, intravenous administration of DPP7 in mice decreased serum levels of active GLP-1 and blood glucose levels. DPP7 was also shown to hydrolyze insulin. In summary, P. gingivalis is important pathogen associated with type 2 diabetes mellitus.

Academic Significance and Societal Importance of the Research Achievements

歯周病原細菌P. gingivalisのDPP4 やDPP7 はインクレチンやインスリンなどの血糖値コントロールにかかわる生理活性物質を切断・不活性化することから,口腔局所に感染しているの本菌の血流への侵入が2型糖尿病の病態形成にかかわることが強く示唆された.以上のことから,歯科処置による口腔内のP. gingivalisの減少は2型糖尿病の予防や病態改善に寄与するものと推察される.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2022 2021 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (3 results)

  • [Journal Article] Expanded substrate specificity supported by P1′ and P2′ residues enables bacterial dipeptidyl-peptidase 7 to degrade bioactive peptides2022

    • Author(s)
      Ohara-Nemoto Yuko、Shimoyama Yu、Ono Toshio、Sarwar Mohammad Tanvir、Nakasato Manami、Sasaki Minoru、Nemoto Takayuki K.
    • Journal Title

      Journal of Biological Chemistry

      Volume: 298 Issue: 3 Pages: 101585-101585

    • DOI

      10.1016/j.jbc.2022.101585

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 歯周炎で保存困難な歯に Er:YAG レーザーを適用した症例2021

    • Author(s)
      永田 光,村井 治,飯塚 章子,中里 茉那美 ,鈴木 啓太,滝沢 尚希,攝待 友宏, 佐々木 大輔,八重柏 隆
    • Organizer
      第 64 回春季日本歯周病学会学術大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 新規ビルレンス因子としての歯周病原細菌DPP4の性状解析2019

    • Author(s)
      中里 茉那美,下山 佑,佐々木 大輔,八重柏 隆
    • Organizer
      岩手科大学歯学会
    • Related Report
      2019 Research-status Report
  • [Presentation] 歯周治療による掌蹠膿疱症性骨関節炎症状の改善2019

    • Author(s)
      千葉 学, 村井 治, 中里 茉那美, 飯塚 章子, 遠藤 憲行, 昆 由美子, 佐々木 大輔, 八重柏 隆
    • Organizer
      第62回秋季日本歯周病学会学術大会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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