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Non-IgE-mediated allergic conjunctivitis induced by endotoxin and allergen in mice.

Research Project

Project/Area Number 20K18346
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 56060:Ophthalmology-related
Research InstitutionKochi University

Principal Investigator

Ishida Waka  高知大学, 医学部, 特任助教 (40761705)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsアレルギー性結膜炎 / アレルギー
Outline of Research at the Start

アレルギー性結膜疾患のマウスモデルにおいて、抗原に含まれるエンドトキシンがIgE非依存性の結膜炎症状を誘導するかどうかについて検討する。マウスの結膜炎は、既報の方法に基づき、能動免疫法あるいは受動免疫法により誘導し評価する。能動免疫法では、卵白アルブミン(Ovalbumin:OVA)マウスを感作した後、エンドトキシン非含有OVAあるいはエンドトキシン含有OVAを点眼し結膜炎の症状に差が出るか観察する。T細胞依存性の反応かどうかを検討するため受動免疫法も行う。さらに治療法の開発として、抗ヒスタミン薬で抑制されるか、T細胞依存性の反応であれば免疫抑制点眼薬により症状が抑制されるかについて検討する。

Outline of Final Research Achievements

Allergic conjunctivitis is thought to be caused by a type I allergic reaction. however, a small number of patients with allergic conjunctivitis have no detectable antigen-specific IgE. In this study, we investigated whether endotoxin, a bacterial constituent, is involved in the development of allergic conjunctivitis symptoms. The results showed that non-IgE-mediated allergic reactions were induced by passive immunization. The non-IgE-mediated allergic reaction was histamine-dependent, and Th2 cells were activated in the conjunctiva, and scratching behavior was induced by endotoxin exposure.

Academic Significance and Societal Importance of the Research Achievements

結膜炎の原因として臨床的には大きく感染性結膜炎とアレルギー性結膜炎の2つに大別される。アレルギー性結膜炎の即時型反応は、主に抗原特異的IgEによって引き起こされると考えられているが、エンドトキシンがIgE非依存性にアレルギー性結膜炎症状を誘導することが明らかになれば、新しい疾患概念を提示できる。また、新規のI型アレルギー反応が細菌の関与で生じることを示す事ができ、その機序がマスト細胞やIgEに依存せず、T細胞やマクロファージなどの他の免疫細胞を介する事が明らかになれば、その機序に即した新しい診断技術や治療法を開発し臨床応用するための基盤となりうる重要な基礎的研究となる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (3 results)

All 2022

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 3 results)

  • [Journal Article] Aqueous-Deficient Dry Eye Exacerbates Signs and Symptoms of Allergic Conjunctivitis in Mice2022

    • Author(s)
      Kishimoto Tatsuma、Ishida Waka、Nakajima Isana、Fukuda Ken、Yamashiro Kenji
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 23 Issue: 9 Pages: 4918-4918

    • DOI

      10.3390/ijms23094918

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Role of Damage-Associated Molecular Patterns (DAMPs/Alarmins) in Severe Ocular Allergic Diseases2022

    • Author(s)
      Fukuda Ken、Ishida Waka、Kishimoto Tatsuma、Nakajima Isana、Miura Yusaku、Sumi Tamaki、Yamashiro Kenji
    • Journal Title

      Cells

      Volume: 11 Issue: 6 Pages: 1051-1051

    • DOI

      10.3390/cells11061051

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Promotion of conjunctival fibroblast-mediated collagen gel contraction by mast cells through up-regulation of matrix metalloproteinase release and activation2022

    • Author(s)
      Kishimoto Tatsuma、Ishida Waka、Nakajima Isana、Taguchi Osamu、Sugioka Koji、Kusaka Shunji、Fukuda Ken
    • Journal Title

      Experimental Eye Research

      Volume: 218 Pages: 108980-108980

    • DOI

      10.1016/j.exer.2022.108980

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access

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Published: 2020-04-28   Modified: 2024-01-30  

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