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2023 Fiscal Year Final Research Report

Basic research on the influence of oral bacteria on respiratory virus infections

Research Project

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Project/Area Number 21K10265
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57080:Social dentistry-related
Research InstitutionNihon University

Principal Investigator

KAMIO Noriaki  日本大学, 歯学部, 准教授 (60546472)

Project Period (FY) 2021-04-01 – 2024-03-31
Keywords口腔細菌 / 歯周病 / 呼吸器ウイルス
Outline of Final Research Achievements

Poor oral hygiene and periodontal disease are risk factors for respiratory virus infections, such as COVID-19 and influenza. This study explored the effect of periodontopathic bacteria, particularly Fusobacterium nucleatum, on respiratory virus infection. Our findings revealed that F. nucleatum enhanced influenza virus replication by inducing TMPRSS2 expression. We also found that F. nucleatum can affect respiratory epithelial tight junction proteins and potentially cause an increase in paracellular permeability in the alveoli. These results provide a scientific basis to support the importance of maintaining good oral hygiene in effectively preventing the onset and/or progression of respiratory virus infections.

Free Research Field

微生物学

Academic Significance and Societal Importance of the Research Achievements

本研究により、歯周病原菌が呼吸器ウイルス感染を促進させること、さらにそのメカニズムの一端を明らかにした。また、生体防御において重要となる呼吸器上皮バリア機能を歯周病原菌が低下させることを明らかにした。この上皮バリア機能の低下は呼吸器ウイルス感染の重症化に関わる可能性が考えられる。以上の結果から、健康な口腔環境を維持し、口腔細菌をコントロールすることが、呼吸器ウイルス感染症の発症や重症化の予防につながる可能性が示唆された。

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Published: 2025-01-30  

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