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2023 Fiscal Year Final Research Report

Elucidation of the molecular basis for regulation of allergic immune responses by Rab27

Research Project

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Project/Area Number 20K08796
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 54020:Connective tissue disease and allergy-related
Research InstitutionGunma University

Principal Investigator

Okunishi Katsuhide  群馬大学, 生体調節研究所, 准教授 (50401112)

Project Period (FY) 2020-04-01 – 2024-03-31
Keywordsアレルギー / Rab27 / サイトカイン / 調節性分泌 / 肥満
Outline of Final Research Achievements

In the current study, we sought to clarify the novel physiological roles of Rab27 and its effectors in allergic immune responses. First, we reported that the Rab27 effector exophilin-5 prevents IL-33-mediated exacerbation of Th2 responses by controlling both IL-33 release from lung epithelial cells and IL-33 receptor expression on IL-5/IL-13-producing pathogenic Th2 cells (J. Clin. Invest. 2020). Then, we clarified that another Rab27 effector Munc13-4 prevents the development of asthma and obesity in mice by positively regulating secretion of immunoregulatory cytokines IL-10 and IL-12 from CD11c+ antigen-presenting cells. Our paper describing these results has recently been published (Allergy 2024). In summary, through the current study, we succeeded in uncovering the novel regulatory roles of Rab27-related proteins in allergic immune responses.

Free Research Field

アレルギー・免疫学

Academic Significance and Societal Importance of the Research Achievements

本研究の結果、これまでほとんど分かっていなかった、分泌制御蛋白質Rab27を介した新奇のアレルギー反応制御機構の存在、および、その分子基盤の一端が、明らかとなった。本研究により、Rab27を介したサイトカインの分泌制御機構という新たな観点から、免疫アレルギー疾患の病態理解を深めることができたと考えている。更に、近年著増している喘息と肥満・糖尿病の両病態において、Rab27が共通の制御因子として作用している可能性を示すことが出来た。将来的に、喘息や肥満・糖尿病を始めとする各種アレルギー・免疫関連疾患において、Rab27関連分子を標的とした新たな治療開発につながることを期待する。

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Published: 2025-01-30  

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