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Identification of nephrotoxic trigger proteins of uremic toxins for advocacy of CKD prevention and treatment methods

Research Project

Project/Area Number 22K19372
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 47:Pharmaceutical sciences and related fields
Research InstitutionKanazawa University

Principal Investigator

Arakawa Hiroshi  金沢大学, 薬学系, 准教授 (40709028)

Co-Investigator(Kenkyū-buntansha) 藤田 光  金沢大学, 薬学系, 助教 (40782850)
Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2023: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2022: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywords腎臓 / トランスポーター / 尿毒症物質 / 尿中排泄 / 炎症 / CD38 / NPT4 / 結合タンパク質 / 毒性 / 尿酸 / インドキシル硫酸 / 慢性腎不全 / 慢性腎毒性 / トリガータンパク質
Outline of Research at the Start

本研究では、慢性腎臓病(CKD)の予防および治療方法の提唱を目指し、CKDの増悪原因となる有機アニオン性尿毒症物質(UTx)の毒性発現メカニズムを明らかとする。この目的達成のため、異分野融合体制に基づいた 1) 好気的呼吸かつ高い有機アニオン輸送体発現を利点とする三次元培養ヒト近位尿細管上皮細胞、2) UTx結合ビーズによるUTx結合タンパク質の同定、3) 網羅的プロテオミクスに基づく代謝経路解析手法を利用し、トリガータンパク質の同定と機能解明を行う。

Outline of Final Research Achievements

This study searched for binding proteins of uric acid, a uremic substance, and found that it binds to an NAD+-degrading enzyme CD38, indicating that uric acid modulates the immune-inflammatory response through inhibition of CD38 in macrophages. This study also found that NPT4, an organic anion transporter, transports indoxyl sulfate as a physiological substrate, and that a decrease in NPT4 function causes an increase in the blood concentration of indoxyl sulfate.

Academic Significance and Societal Importance of the Research Achievements

尿酸の生理的意義は抗酸化作用以外不明であったが、本研究により尿酸はNAD+の細胞内濃度の調節に関与し、急性炎症反応を抑制する働きがあることが示された。またインドキシル硫酸の尿中排泄に関わる輸送機構を明らかとしたことで、尿毒症物質の体内蓄積を低下させる治療・予防手法へ発展させられる可能性を示すことができた。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (4 results)

All 2024 2023

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Role of Organic Anion Transporter NPT4 in Renal Handling of Uremic Toxin 3-indoxyl Sulfate2024

    • Author(s)
      Imamura Rikako、Sugimoto Masahiro、Horike Shin-ichi、Terakawa Jumpei、Fujita Kazuki、Tamai Ikumi、Daikoku Takiko、Kato Yukio、Arakawa Hiroshi
    • Journal Title

      Journal of Pharmaceutical Sciences

      Volume: -

    • DOI

      10.1016/j.xphs.2024.04.014

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Functional identification of soluble uric acid as an endogenous inhibitor of CD382024

    • Author(s)
      Wen S, Arakawa H, Yokoyama S, Shirasaka Y, Higashida H, Tamai I.
    • Journal Title

      eLife

      Volume: none Pages: 1-1

    • DOI

      10.7554/elife.96962.1

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 尿酸の炎症反応を介した慢性腎臓病進展メカニズムと腎臓病態評価モデルの構築2023

    • Author(s)
      荒川大
    • Journal Title

      細胞

      Volume: 55 Pages: 43-46

    • Related Report
      2022 Research-status Report
  • [Presentation] Functional analysis of the organic anion transporter NPT4 by metabolomics approach2023

    • Author(s)
      Rikako Imamura, Yumi Aizawa, Kazuki Fujita, Ikumi Tamai, Masahiro Sugimoto, Yukio Kato, Hiroshi Arakawa
    • Organizer
      日本薬物動態学会第38回年会 第23回シトクロムP450国際会議
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2022-07-05   Modified: 2025-01-30  

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