2021 Fiscal Year Final Research Report
Functional analysis of PI4K complex for elucidation of pathogenesis and drug development of E. histolytica
Project/Area Number |
20K22758
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Research Category |
Grant-in-Aid for Research Activity Start-up
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Allocation Type | Multi-year Fund |
Review Section |
0803:Pathology, infection/immunology, and related fields
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Research Institution | The University of Tokyo |
Principal Investigator |
Watanabe Natsuki 東京大学, 大学院医学系研究科(医学部), 特任研究員 (00883323)
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Project Period (FY) |
2020-09-11 – 2022-03-31
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Keywords | PI4K / TTC7 / phosphatidylinositol / phagocytosis / 貪食 / 赤痢アメーバ |
Outline of Final Research Achievements |
To understand the function of phosphatidyl inositol 4-kinase (PI4K) in Entamoeba histolytica, gene silencing (GS) strains of PI4K co-factors, TTC7 and EHI_151680 which were detected in proteome analysis of PI4K immunoprecipitated samples, were established. Phagocytosis efficiency was decreased in TTC7 and EHI_151680 gene silencing strain, suggesting PI4K and these co-factors are involved in phagocytosis. This fact is consistent with previous report about PI4P. Furthermore, HA tagged TTC7 and EHI_151680 overexpressing strains were established, and immunofluorescence assay was done to confirm the localization of co-factors. Expression level was too low, however the localization was confirmed in cytosol. This localization is same as GFP-tagged TTC7 and EHI_151680 suggesting this result support previous result and the localization is clearly cytosol.
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Free Research Field |
分子寄生虫学
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Academic Significance and Societal Importance of the Research Achievements |
PI4P/PI4KIIIα は、C型肝炎ウィルス (HCV) や、ポリオウィルスの細胞内での複製時に、重要な役割を担っていることが示されている。さらに、PI4KIIIβ は抗マラリア薬の標的としても注目され、特異的阻害剤が薬剤として開発されている。本研究により、赤痢アメーバにおいてPI4Kが貪食という重要な病原機構に関与することが明らかとなった。これは、貪食機構の解明や薬剤開発のために重要な進展となった。また、多種生物において報告がなかった、PI4Kが貪食に関与するという事実が明らかとなった。これは多種生物におけるPI4K機能解析の際にも、重要な事実となる。
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