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Novel modulating mechanisms of homeostasis by oral bacterial exopeptidases

Research Project

Project/Area Number 19K10071
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57020:Oral pathobiological science-related
Research InstitutionNagasaki University

Principal Investigator

Ohara-Nemoto Yuko  長崎大学, 医歯薬学総合研究科(歯学系), 客員研究員 (10164667)

Co-Investigator(Kenkyū-buntansha) 根本 孝幸  長崎大学, 医歯薬学総合研究科(歯学系), 客員研究員 (90164665)
下山 佑  岩手医科大学, 歯学部, 准教授 (90453331)
小早川 健  長崎大学, 医歯薬学総合研究科(歯学系), 技術職員 (10153587)
佐々木 実  岩手医科大学, 歯学部, 教授 (40187133)
木村 重信  関西女子短期大学, その他部局等, 教授 (10177917)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsDPP4 / DPP7 / ジペプチド / 歯周病原菌 / インクレチン / 糖尿病 / 生理活性ペプチド / Porphyromonas gingivalis / 歯周病菌 / 免疫電顕 / DPP / 歯周病 / アミノ酸取り込み / Pot / 血糖値 / エキソペプチダーゼ / 恒常性 / 細菌 / 血液凝固
Outline of Research at the Start

歯周病原菌は全身疾患のリスクファクターとされ,特に重度歯周炎に関連する‘red complex’菌種であるジンジバリス菌は2型糖尿病,急性冠症候群血栓,慢性関節リウマチの増悪に関与すると考えられている。これまでの研究から,慢性歯周病罹患による炎症状態とこれら疾患との間接的な連関が提起されているが,これを踏まえて,本研究では,私達が発見した歯周病菌が持つペプチド分解酵素(エキソペプチダーゼ)によって,生体の恒常性維持に関与する分子が分解されることを明らかにするものである。本研究成果により,口腔-全身疾患連関のより直接的な分子メカニズムが明らかになる可能性がある。

Outline of Final Research Achievements

This study revealed details of acylpeptidyl oligopeptidase (AOP) activity, dipeptidase A. Furthermore, dipeptides were predominantly taken up in Porphyromonas gingivalis cells via an H+-dependent oligopeptide transporter (Pot). We also reported that periodontal bacterial DPP4 and DPP7 degraded and inactivated incretins, increasing postprandial hyperglycemia and prolongation of hyperglycemic time and that DPP7 has a broad substrate specificity, which causes degradation of various bioactive peptides. Immunoelectron microscopy observations suggested the existence of a series of spatial arrangements in which dipeptides produced in the periplasmic space are transported via plasma membrane-localized POT.

Academic Significance and Societal Importance of the Research Achievements

歯周病原菌,特に重度歯周炎に関連するP. gingivalisは2型糖尿病,急性冠症候群血栓,慢性関節リウマチのリスクファクターとされている。これらの歯周病-全身疾患連関を説明する機構として,我々はP. gingivalisのジペプチド産生ペプチダーゼ活性の詳細な検討とそれらの機能解明を行い,歯肉縁下プラーク細菌DPP(特にDPP4とDPP7)が血糖維持に関与する生理活性ペプチド等を分解する事を見いだした。本研究の成果は口腔細菌ペプチダーゼによる宿主因子の分解不活化が歯周病-全身疾患連関の分子メカニズムの一端であることを初めて示したものである。

Report

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

    (13 results)

All 2023 2022 2021 2020 2019 Other

All Journal Article (8 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 8 results,  Open Access: 7 results) Presentation (4 results) Remarks (1 results)

  • [Journal Article] Exacerbation mechanism of type 2 diabetes mellitus by periodontopathic bacterial dipeptidyl-peptidases (DPPs)2023

    • Author(s)
      Nakasato-Suzuki Manami、Shimoyama Yu、Ohara-Nemoto Yuko、Sasaki Daisuke、Nemoto Takayuki K.、Yaegashi Takashi
    • Journal Title

      Nihon Shishubyo Gakkai Kaishi (Journal of the Japanese Society of Periodontology)

      Volume: 65 Issue: 1 Pages: 1-8

    • DOI

      10.2329/perio.65.1

    • ISSN
      0385-0110, 1880-408X
    • Year and Date
      2023-03-31
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Immunoelectron Microscopic Analysis of Dipeptidyl-Peptidases and Dipeptide Transporter Involved in Nutrient Acquisition in Porphyromonas gingivalis2023

    • Author(s)
      Shimoyama Yu、Sasaki Daisuke、Ohara-Nemoto Yuko、Nemoto Takayuki K.、Nakasato Manami、Sasaki Minoru、Ishikawa Taichi
    • Journal Title

      Current Microbiology

      Volume: 80 Issue: 4 Pages: 106-106

    • DOI

      10.1007/s00284-023-03212-4

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [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 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dipeptidyl-peptidases: Key enzymes producing entry forms of extracellular proteins in asaccharolytic periodontopathic bacterium Porphyromonas gingivalis2021

    • Author(s)
      Nemoto TK, Ohara Nemoto Y.
    • Journal Title

      Mol Oral Microbiol

      Volume: 36 Issue: 2 Pages: 145-156

    • DOI

      10.1111/omi.12317

    • NAID

      120006988506

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Preferential dipeptide incorporation of Porphyromonas gingivalis mediated by proton-dependent oligopeptide transporter (Pot)2020

    • Author(s)
      Ohara-Nemoto Y, Sarwar MT, Shimoyama Y, Kobayakawa T, Nemoto TK.
    • Journal Title

      FEMS Microbial Lett

      Volume: 367 Issue: 24 Pages: 1-8

    • DOI

      10.1093/femsle/fnaa204

    • NAID

      120006980746

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Characterization of substrate specificity and novel autoprocessing mechanism of dipeptidase A from Prevotella intermedia2020

    • Author(s)
      Sarwar, M.T., Ohara-Nemoto, Y., Kobayakawa, T., Naito, M., Nemoto, T.K.
    • Journal Title

      Biol. Chem.

      Volume: 401 Issue: 5 Pages: 629-642

    • DOI

      10.1515/hsz-2019-0387

    • NAID

      120006988332

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Suppressive effects of N-bisphosphonate in osteoblastic cells mitigated by non-N-bisphosphonate but not by sodium-dependent phosphate cotransporter inhibitor.2019

    • Author(s)
      Baba TT, Miyazaki T, Ohara-Nemoto Y, Nemoto TK.
    • Journal Title

      Cell Biochem Funct

      Volume: 37 Issue: 6 Pages: 400-407

    • DOI

      10.1002/cbf.3418

    • NAID

      120006988454

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Characterization of bacterial acylpeptidyl-oligopeptidase.2019

    • Author(s)
      Nemoto TK, Ono T, Kobayakawa T, Ohara-Nemoto Y.
    • Journal Title

      Biochimie

      Volume: 163 Pages: 50-57

    • DOI

      10.1016/j.biochi.2019.05.007

    • NAID

      120006987741

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Localization of DPPs and dipeptide transporter Pot in Porphyromonas gingivalis defined by IEM.2021

    • Author(s)
      下山佑,根本優子,根本孝幸,石河太知,佐々木大輔,古玉芳豊,木村重信,佐々木実
    • Organizer
      第94回 日本細菌学会総会
    • Related Report
      2021 Research-status Report
  • [Presentation] Localization of DPPs and dipeptide transporter Pot in Porphyromonas gingivalis defined by IEM.2020

    • Author(s)
      Yu Shimoyama, Yuko Ohara-Nemoto, Takayuki K. Nemoto, Taichi Ishikawa, Daisuke Sasaki, Yoshitoyo Kodama, Shigenobu Kimura and Minoru Sasaki
    • Organizer
      第94回 日本細菌学会総会
    • Related Report
      2020 Research-status Report
  • [Presentation] Prevotella intermediaのジペプチダーゼの同定: C69.001ファミリージペプチダーゼAのN末特異性の再定義2019

    • Author(s)
      1.Tanvir S.M.,根本優子,小野俊雄,根本孝幸
    • Organizer
      第61回歯科基礎医学会学術大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Proton-coupled dipeptide transporter in Porphyromonas gingivalis2019

    • Author(s)
      根本優子,Tanvir SM, 小早川健,根本孝幸
    • Organizer
      第61回歯科基礎医学会学術大会
    • Related Report
      2019 Research-status Report
  • [Remarks] 歯周病菌ジペプチジルペプチダーゼ7は広範な基質特性を有し,この活性により血糖調節に関与する

    • URL

      https://www.nagasaki-u.ac.jp/ja/science/science261.html

    • Related Report
      2021 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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