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Pathophysiological analysis of pediatric kidney diseases focusing on physical characteristics of urinary extracellular vesicles

Research Project

Project/Area Number 22K20847
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0902:General internal medicine and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Takizawa Keiichi  東京大学, 医学部附属病院, 助教 (10791957)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords尿中細胞外小胞 / 小児慢性腎臓病 / 小児腎疾患 / ナノ粒子追跡解析
Outline of Research at the Start

尿を用いて腎組織の変化を非侵襲的に捉え、疾患の早期発見や病態解明につなげたい。申請者は尿中バイオマーカーリソースとして細胞外小胞(Extracellular Vesicles :EV)に着目し研究を行ってきた。細胞は様々な特性を持った異種のEVを放出し、それらは由来する細胞の分子情報を保有する。そのため尿中EVは腎組織で生じている様々な変化を反映すると考えられる。既に解析済である尿中EVのプロテオームデータに加え、本研究ではナノ粒子追跡解析およびマイクロ流路粒子解析を行い、健常人と腎疾患患者で尿中EVの物理特性に変化があるか、病態解明、診断、重症度判定に応用できるかを検討する。

Outline of Final Research Achievements

To characterize the physics of urinary extracellular vesicles (urinary EVs) in pediatric chronic kidney disease (CKD) patients, nanoparticle tracking analysis and proteome analysis were performed in healthy children and pediatric CKD patients. The density of peak size was found to be significantly lower in pediatric CKD patients, and urinary concentration was also found to affect the number and size of particles. Also, we observed changes in the expression levels of a specific molecules in urinary EVs in pediatric CKD patients regardless of physical parameters, and an ELISA protocol was established to measure the expression of these molecules in a simple manner (Takizawa K et al STAR Protoc. 2023).

Academic Significance and Societal Importance of the Research Achievements

小児CKDの多くは、希釈尿で、かつ顕著な蛋白尿や血尿を認めないため、現状の学校検尿システムでは見逃されることが多い。また、血清クレアチニンによる糸球体濾過量の測定は侵襲的であるだけでなく、残存ネフロンによる代償により病態の早期検出が困難であるという問題を抱えている。本研究成果で得られた小児CKDに特徴的な尿中EVの物理特性や分子発現量の変化を高精度に測定できる検査系を確立することができれば、上記の問題を解決し、これまで見逃されていた小児CKDの早期発見につながることが期待できる。

Report

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

    (7 results)

All 2023 2022

All Journal Article (2 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)

  • [Journal Article] Enzyme-linked immunosorbent assay to detect surface marker proteins of extracellular vesicles purified from human urine2023

    • Author(s)
      Takizawa Keiichi、Nishimura Tatsuya、Harita Yutaka
    • Journal Title

      STAR Protocols

      Volume: 4 Issue: 3 Pages: 102415-102415

    • DOI

      10.1016/j.xpro.2023.102415

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Urinary extracellular vesicles signature for diagnosis of kidney disease2022

    • Author(s)
      Takizawa Keiichi、Ueda Koji、Sekiguchi Masahiro、Nakano Eiji、Nishimura Tatsuya、Kajiho Yuko、Kanda Shoichiro、Miura Kenichiro、Hattori Motoshi、Hashimoto Junya、Hamasaki Yuko、Hisano Masataka、Omori Tae、Okamoto Takayuki、Kitayama Hirotsugu、Fujita Naoya、Kuramochi Hiromi、Ichiki Takanori、Oka Akira、Harita Yutaka
    • Journal Title

      iScience

      Volume: 25 Issue: 11 Pages: 105416-105416

    • DOI

      10.1016/j.isci.2022.105416

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Urinary extracellular vesicles as biomarkers of pediatric kidney diseases2023

    • Author(s)
      Keiichi Takizawa
    • Organizer
      The 18th Congress of Asian Society for Pediatric Research
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] MUC1 on urinary extracellular vesicles for detection of impaired renal function2023

    • Author(s)
      Keiichi Takizawa,Tatsuya Nishimura, Yutaka Harita
    • Organizer
      Kidney Week 2023, American society of Nephrology
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 尿中細胞外小胞を用いた腎機能低下の検出2023

    • Author(s)
      滝澤 慶一, 西村 竜哉, 張田 豊
    • Organizer
      第66回日本腎臓学会学術総会
    • Related Report
      2023 Annual Research Report
  • [Presentation] DOHaD関連慢性腎臓病スクリーニングにおける尿中細胞外小胞の有用性2023

    • Author(s)
      西村竜哉, 滝澤慶一, 張田豊
    • Organizer
      第31回発達腎研究会
    • Related Report
      2023 Annual Research Report
  • [Patent(Industrial Property Rights)] 腎機能障害診断マーカーの検出方法、腎予後の判定方法、腎機能障害診断マーカーの検出キット及び腎機能障害診断マーカー2022

    • Inventor(s)
      滝澤慶一・植田幸嗣・張田豊
    • Industrial Property Rights Holder
      滝澤慶一・植田幸嗣・張田豊
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      2022 Research-status Report
    • Overseas

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Published: 2022-09-01   Modified: 2025-01-30  

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