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Elucidation of the effects of Pg infection on the pathogenesis of diabetes through intestinal dysbiosis

Research Project

Project/Area Number 21K16968
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Akutagawa Keiichi  広島大学, 医系科学研究科(歯), 専門研究員 (40826369)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords歯周炎 / 糖尿病 / う蝕 / 脳出血 / 口腔細菌 / dysbiosis / Porphyromonas gingival / セグメント細菌 / フコース / 腸内細菌叢
Outline of Research at the Start

本研究では、近年着目されている歯周病原細菌Porphyromonas gingivalis(Pg)感染が糖尿病(DM)の病態憎悪に影響するメカニズムを、腸管の免疫応答に着目して解析する。
Pg感染が腸管上皮細胞および常在リンパ球系に与える影響と、その結果引き起こされるdysbiosisが糖尿病に影響を与えるのではないかと考え、Pg-DMマウスを使用してPgのセグメント細菌と Th17細胞および腸管のdysbiosisを介すると考えられる常在自然リンパ球系への影響を評価する事で、Pg口腔感染が糖尿病の病態に与える影響を明らかにする。

Outline of Final Research Achievements

In this research project, we focus on periodontal pathogen P. gingivalis infection and caries-causing bacteria S. mutans dental pulp infection. We elucidated the mechanism using an animal model. P. gingivalis-infected diabetic mice had thickened Peyer's patches and altered gut microbiota compared with diabetic mice. In addition, in a rat model infected with S. mutans, expansion of cerebral hemorrhage was observed due to strong adhesion of bacteria to vascular endothelial cells via extracellular matrix type I and type IV collagen. Elucidation of these mechanisms is expected to lead to the importance of oral treatment and the development of new treatment methods.

Academic Significance and Societal Importance of the Research Achievements

本研究課題の成果から、歯周病やう蝕と行った口腔感染症が足がかりとなり、歯周組織から血行性に、または消化管を通して腸内細菌叢へ影響を与えることが明らかとなった。これら局所の変化が全身へ波及(全身疾患の発症、増悪)することも示唆されたことから、今後歯科受診、歯科治療の重要性を国民に周知するための根拠となる結果である。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2022 Other

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

  • [Int'l Joint Research] Nova Southeastern University(米国)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Periapical lesion following Cnm-positive Streptococcus mutans pulp infection worsens cerebral hemorrhage onset in an SHRSP rat model2022

    • Author(s)
      Taniguchi Yuri、Ouhara Kazuhisa、Kitagawa Masae、Akutagawa Keiichi、Kawada-Matsuo Miki、Tamura Tetsuya、Zhai Ruoqi、Hamamoto Yuta、Kajiya Mikihito、Matsuda Shinji、Maruyama Hirofumi、Komatsuzawa Hitoshi、Shiba Hideki、Mizuno Noriyoshi
    • Journal Title

      Clinical and Experimental Immunology

      Volume: 210 Issue: 3 Pages: 321-330

    • DOI

      10.1093/cei/uxac094

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access

URL: 

Published: 2021-04-28   Modified: 2024-01-30  

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