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Detection of recoverable injured podocytes using EGR-1 staining

Research Project

Project/Area Number 21K16172
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53040:Nephrology-related
Research InstitutionJikei University School of Medicine

Principal Investigator

Okabe Masahiro  東京慈恵会医科大学, 医学部, 助教 (70595272)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsポドサイト / ポドサイト傷害 / EGR-1 / 糸球体疾患 / 糸球体腎炎 / ネフローゼ症候群 / 慢性腎臓病 / IgA腎症 / EGRー1 / CKD / ループス腎炎
Outline of Research at the Start

腎臓の中で糸球体という濾過装置の要として働くポドサイトは,体内で増殖や再生ができない細胞である.糸球体内の多くのポドサイトが死に至る,あるいは糸球体から剥がれてしまうと,糸球体は硬化して機能を果たせなくなり,不可逆的に腎障害が進行する.現在4万人以上の慢性腎臓病患者が毎年透析導入に至っているが,ポドサイト傷害を早期に発見し治療することで,腎臓病の進行抑制,さらには透析に至る患者を減らせる可能性がある.本研究では傷害早期に陽性となるEGR-1を用いることで,回復可能なポドサイトを検出できるかを検討する.

Outline of Final Research Achievements

In human glomerular diseases, podocyte EGR-1 expression was positively correlated with urinary protein level and urinary podocyte-related mRNA levels and inversely correlated with expression of podocyte-related protein, suggesting an association between podocyte EGR-1 expression and podocyte injury. Podocyte EGR-1 expression tended to be higher in patients with glomerulonephritis and was associated with histological acute lesions of glomerulonephritis. EGR-1 in podocytes may be expressed by acute injury. Most patients with IgA nephropathy or lupus nephritis had a reduction of urinary protein with treatment, even in patients with a high percentage of EGR-1 positive podocytes. These findings suggest the reversibility of injured podocytes expressing EGR-1. Thus, EGR-1 staining may be useful in detecting reversible injured podocytes.

Academic Significance and Societal Importance of the Research Achievements

腎臓の濾過装置である糸球体の重要な構成細胞であるポドサイトを保護することは,腎臓病の進行を抑える上で重要である.ポドサイトは傷害を受け続けると糸球体から剥がれ落ち,かつ再生できないため,早期に傷害ポドサイトを検出し,剥がれ落ちる前に保護することが望まれる.本研究により,糸球体疾患患者においてEGR-1が回復可能な傷害ポドサイトを検出できるマーカーとなり得る可能性を見出した.EGR-1染色を行うことで,糸球体疾患患者のポドサイト傷害の程度を可視化することが可能となり,また,予後や治療反応性を予測し,免疫抑制剤の使用方法を変更するなど,個々の患者にあわせたオーダーメイド治療につながる可能性がある.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (12 results)

All 2024 2023 2022 2021

All Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 3 results) Book (1 results)

  • [Journal Article] Early growth response 1 as a podocyte injury marker in human glomerular diseases2024

    • Author(s)
      Okabe Masahiro, Koike Kentaro, Yamamoto Izumi, Tsuboi Nobuo, Matsusaka Taiji, Yokoo Takashi
    • Journal Title

      Clinical Kidney Journal

      Volume: 17 Issue: 1

    • DOI

      10.1093/ckj/sfad289

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Podocytes are lost from glomeruli before completing apoptosis2022

    • Author(s)
      Yamamoto Kazuyoshi、Okabe Masahiro、Tanaka Keiko、Yokoo Takashi、Pastan Ira、Araoka Toshikazu、Osafune Kenji、Udagawa Tomohiro、Koizumi Masahiro、Matsusaka Taiji
    • Journal Title

      American Journal of Physiology-Renal Physiology

      Volume: 323 Issue: 5 Pages: F515-F526

    • DOI

      10.1152/ajprenal.00080.2022

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ポドサイト傷害の糸球体内伝搬2022

    • Author(s)
      岡部匡裕1,松阪泰二2
    • Journal Title

      腎臓内科

      Volume: 15 Pages: 698-703

    • Related Report
      2022 Research-status Report
  • [Journal Article] Indirect podocyte injury manifested in a partial podocytectomy mouse model2021

    • Author(s)
      Okabe Masahiro, Yamamoto Kazuyoshi, Miyazaki Yoichi, Motojima Masaru, Ohtsuka Masato, Pastan Ira, Yokoo Takashi, Matsusaka Taiji
    • Journal Title

      American Journal of Physiology-Renal Physiology

      Volume: 320 Issue: 5 Pages: F922-F933

    • DOI

      10.1152/ajprenal.00602.2020

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Podocyte Injury Marker EGR1 in Lupus Nephritis2023

    • Author(s)
      Masahiro Okabe, Kentaro Koike, Nobuo Tsuboi, Taiji Matsusaka, Takashi Yokoo
    • Organizer
      American Society of Nephrology Kidney Week 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 微小変化型ネフローゼ症候群および巣状分節性糸球体硬化症におけるポドサイトEGR1発現2023

    • Author(s)
      岡部 匡裕, 小池 健太郎, 坪井 伸夫, 松阪 泰二, 横尾 隆
    • Organizer
      第66回日本腎臓学会学術総会
    • Related Report
      2023 Annual Research Report
  • [Presentation] ループス腎炎におけるポドサイト傷害マーカーとしてのEGR1の意義2022

    • Author(s)
      岡部匡裕,小池健太郎,坪井伸夫,松阪泰二,横尾 隆
    • Organizer
      第65回日本腎臓学会学術総会
    • Related Report
      2022 Research-status Report
  • [Presentation] EGR1 is an Injury Marker in Podocytes2021

    • Author(s)
      Masahiro Okabe, Nobuo Tsuboi, Taiji Matsusaka, Takashi Yokoo
    • Organizer
      American Society of Nephrology Kidney Week 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Atypical Caspase 3-Dependent Death in Podocytes2021

    • Author(s)
      Kazuyoshi Yamamoto, Masahiro Okabe, Taiji Matsusaka, Takashi Yokoo
    • Organizer
      American Society of Nephrology Kidney Week 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] ポドサイト障害マーカーとしてのEGR1発現の検証2021

    • Author(s)
      岡部 匡裕,坪井 伸夫,松阪 泰二,横尾 隆
    • Organizer
      第64回日本腎臓学会学術総会
    • Related Report
      2021 Research-status Report
  • [Presentation] ポドサイトの caspase3依存性非典型的細胞死2021

    • Author(s)
      山本 和佳,岡部 匡裕,田中 景子,横尾 隆,松阪 泰二
    • Organizer
      第64回日本腎臓学会学術総会
    • Related Report
      2021 Research-status Report
  • [Book] モデル動物の作製と利用-循環器疾患2021 <下巻> 第2章 慢性腎臓病モデル,第3節 原発性糸球体障 害モデル,第4項 ポドサイト傷害モデル2021

    • Author(s)
      岡部 匡裕,松阪 泰二
    • Total Pages
      411
    • Publisher
      株式会社エル・アイ・シー
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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