Molecular and functional analysis of a novel endocytic pathway associated with macropinocytosis
Project/Area Number |
18K06831
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 48010:Anatomy-related
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Research Institution | Kagawa University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
江上 洋平 香川大学, 医学部, 講師 (80432780)
川合 克久 香川大学, 医学部, 助教 (80534510)
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Project Period (FY) |
2018-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2021)
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Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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Keywords | エンドサイトーシス / 膜輸送 / Rabタンパク質 / マクロパイノサイトーシス / ライブセルイメージング / 光遺伝学 / マクロピノサイトーシス / PI3キナーゼ / 細胞内輸送 |
Outline of Final Research Achievements |
We found that Rab10-positive tubular structures arise from macropinocytic cups during an early stage of macropinocytosis in RAW264 macrophages and proposed that these structures represent a novel endocytic pathway. By live-cell imaging, we further demonstrated that the Rab10-positive tubular structures are dependent on microtubules, regulated by Rac1 and PI3K, and are associated with EHBP1, as a downstream molecule of Rab10. Upon PI3K inhibition, fluid-phase endocytosis thorough macropinosomes was switched to a membrane transport pathway through Rab10-positive tubules. It was also found that PD-L1, a target molecule for immune checkpoint therapy,is incorporated into Rab10-positive tubular endosomes and transported toward the Golgi region. Thus,this novel endocytic pathway may contribute to the intracellular transport of important membrane molecules.
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Academic Significance and Societal Importance of the Research Achievements |
本研究によってマクロパイノサイトーシス経路から派生する新たなエンドサイトーシス経路としてRab10陽性管状エンドゾームの存在が確立され、その形成・制御の分子基盤や機能の一部が解明された.この経路は、通常のエンドサイトーシス経路と異なりリソゾームによる分解を受けないという特徴があり、機能的には、免疫チェックポイント療法の標的分子として知られるPD-L1の細胞内輸送経路として働いている可能性が高い。これらのことから、この経路の分子メカニズムを理解し制御することが可能になれば、がん免疫療法の改善・応用にもつながると期待される。
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Report
(5 results)
Research Products
(21 results)
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[Journal Article] AMPK Complex Activation Promotes Sarcolemmal Repair in Dysferlinopathy2020
Author(s)
Ono Hiroya、Suzuki Naoki、Kanno Shin-ichiro、Kawahara Genri、Izumi Rumiko、Takahashi Toshiaki、Kitajima Yasuo、Osana Shion、Nakamura Naoko、Akiyama Tetsuya、Ikeda Kensuke、Shijo Tomomi、Mitsuzawa Shio、Nagatomi Ryoichi、Araki Nobukazu、Yasui Akira、Warita Hitoshi、Hayashi Yukiko K.、Miyake Katsuya、Aoki Masashi
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Journal Title
Molecular Therapy
Volume: 28
Issue: 4
Pages: 1133-1153
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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