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Importance of the Intracellular Antioxidant Thioredoxin in a Mouse Model of Retinopathy of Prematurity

Research Project

Project/Area Number 19K08259
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionSaitama Medical University

Principal Investigator

Namba Fumihiko  埼玉医科大学, 医学部, 准教授 (20643323)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords未熟児網膜症 / 高濃度酸素 / 早産児 / チオレドキシン / 動物モデル / 血管新生 / 無血管野
Outline of Research at the Start

申請者らは、抗酸化酵素ヒト・チオレドキシン(human thioredoxin、hTRX)を高発現するトランスジェニック(transgenic、Tg)マウスを用い、肺内hTRX 発現上昇は生直後の高濃度酸素性肺傷害に対して防御的に働くことを示してきた。本研究では、同hTRX Tgマウスを用い、高濃度酸素暴露による未熟児網膜症(retinopathy of prematurity、ROP)マウスモデルにおけるhTRX の重要性を明らかにし、またヒト早産児検体中hTRX 濃度がROP のバイオマーカーになり得るか検討することを目的とする。

Outline of Final Research Achievements

Wild-type (WT) and thioredoxin-1 (TRX)-Tg mice were exposed to high concentrations of oxygen during the neonatal period and retinal phenotypes were evaluated. After exposure to hyperoxia, WT showed an increase in the area of atretic vessels and nodules due to neovascularization in the retina, whereas the increase was reduced in TRX-Tg mice. During the recovery period from exposure to hyperoxia, TRX-Tg suppressed abnormal neovascularization and increased vascular permeability. Overexpressed TRX alleviated the phenotype of hyperoxia-induced retinopathy by modulating gene expression of inflammatory cytokines and angiogenic factors.

Academic Significance and Societal Importance of the Research Achievements

未熟児網膜症(retinopathy of prematurity、ROP)は、小児の失明原因の中で最も多い原因の一つで、主に在胎期間28週未満の超早産児が罹患する。現在、ROPに対する治療として、レーザー光凝固術、冷凍凝固術、抗血管内皮増殖因子薬硝子体注射が行われているが、その効果は限定的であり、副作用も懸念される。本研究では、TRX-Tgマウスは、WTマウスと比較して、高濃度酸素曝露による網膜障害を軽減した。今回のわれわれの結果から、TRXは将来ROPの予防または治療薬として臨床応用されることが期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2022 2021 2019

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

  • [Journal Article] Thioredoxin-1 Ameliorates Oxygen-Induced Retinopathy in Newborn Mice Through Modulation of Proinflammatory and Angiogenic Factors2022

    • Author(s)
      Junichi Ozawa, Kosuke Tanaka, Yukio Arai, Mitsuhiro Haga, Naoyuki Miyahara, Ai Miyamoto, Eri Nishimura and Fumihiko Namba
    • Journal Title

      Antioxidants

      Volume: 11 Pages: 899-899

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Thioredoxin-1 ameliorates oxygen-induced retinopathy in newborn mice through modulation of angiogenic factors2021

    • Author(s)
      Ozawa J, Tanaka K, Namba F, et al
    • Organizer
      Pediatric Academic Societies Annual Meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Thioredoxin-1 ameliorates oxygen-induced retinopathy in newborn mice through modulation of angiogenic factors2021

    • Author(s)
      Junichi Ozawa, Kosuke Tanaka,Yukio Arai, Mitsuhiro Haga Fumihiko Namba
    • Organizer
      Pediatric Academic Societies Annual Meeting 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Thioredoxin-1 ameliorates oxygen-induced retinopathy in newborn mice2019

    • Author(s)
      Junichi Ozawa, Kosuke Tanaka, Yukio Arai, Kikumi Matsuoka, Fumihiko Namba
    • Organizer
      The 3rd Taiwan-Korea-Japan Joint Congress on Neonatology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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