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2023 Fiscal Year Final Research Report

Periodontopathic bacterial outer membrane vesicles: Biogenesis and relation to development of chronic inflammation and carcinogenesis

Research Project

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Project/Area Number 20H03861
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 57020:Oral pathobiological science-related
Research InstitutionNational Institute of Infectious Diseases

Principal Investigator

Nakao Ryoma  国立感染症研究所, 細菌第一部, 主任研究官 (10370959)

Co-Investigator(Kenkyū-buntansha) 尾花 望  筑波大学, 医学医療系, 助教 (00722688)
川崎 忠寛  一般財団法人ファインセラミックスセンター, その他部局等, 主任研究員 (10372533)
泉福 英信  日本大学, 松戸歯学部, 教授 (20250186)
平山 悟  新潟大学, 医歯学系, 助教 (70778555)
佐々木 祐生  一般財団法人ファインセラミックスセンター, その他部局等, 上級研究員 (80808668)
上野 尚雄  国立研究開発法人国立がん研究センター, 中央病院, 医長 (90450832)
Project Period (FY) 2020-04-01 – 2023-03-31
KeywordsOuter membrane vesicles / Porphyromonas gingivalis
Outline of Final Research Achievements

To observe the detailed structures of inside cells of Porphyromonas gingivalis (Pg), we established a combinational method of freeze fracture (FF) and scanning electron microscopy (SEM). Similar approach using the combination of FF and SEM for Pg outer membrane vesicles (OMVs) is on-going. OMV-like structures were formed on the surface of Pg when matcha green tea was added to Pg cells. In a mouse model study Pg cannot cross the blood-brain barrier (BBB), whereas OMVs likely cross the BBB and induce neurodegenerative diseases. Comparison of the total number of Pg bacteria in saliva and the ratio of Pg to total bacteria by the organ in which the patient's cancer occurred showed a trend toward higher number/rate in breast cancer patients, although no statistically significant difference was observed.

Free Research Field

細菌学

Academic Significance and Societal Importance of the Research Achievements

PgおよびPg由来OMVsは、口腔のみならず全身の健康に影響を与える可能性がある。本研究では、OMVsの産生機構、構造生物学に関する知見が蓄積された。また動物や人を対象としたPg OMVsに関する研究が推進された。PgのOMVsに関する包括的な研究によって、OMVsと慢性疾患・がんの連関解明の糸口となるような複数の成果が得られた。

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Published: 2025-01-30  

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