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Role of LAMP2 in early pathogenesis of AMD: development of a new animal model

Research Project

Project/Area Number 19K18880
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Notomi Shoji  九州大学, 大学病院, 助教 (10836563)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywordsオートファジー / リソソーム膜タンパク / 加齢性神経変性 / 加齢黄斑変性 / リソソーム / LAMP2 / 網膜色素上皮 / 加齢
Outline of Research at the Start

近年、加齢黄斑変性の治療において抗血管内皮増殖因子(VEGF)薬により脈絡膜新生血管を制御する治療が可能になった。しかし、初期病変として見られる網膜色素上皮細胞(RPE)下に蓄積する「ドル ーゼン」と呼ばれる特徴的な老廃物ついては不明な点が多く、明確な介入治療はない。本研究により、加齢黄斑変性におけるリソソーム機能障害の役割が明らかになり、初期病態を制御する新たな分子標的として LAMP2の機能を検証する。

Outline of Final Research Achievements

Extracellular tissue debris accumulates with aging and in the most prevalent central-vision-threatening eye disorder, age- related macular degeneration (AMD). In this work, we discovered that lysosome-associated membrane protein-2 (LAMP2), a glycoprotein that plays a critical role in lysosomal biogenesis and maturation of autophagosomes/phagosomes, is preferentially expressed in the outermost, neuroepithelial layer of the retina, the retinal pigment epithelium (RPE), and contributes to the prevention of ultrastructural changes in extracellular basolaminar deposits including lipids and apolipoproteins. LAMP2 thus appears to play an important role in RPE biology, and its apparent de- crease with aging and in AMD specimens suggests that its de- ficiency may accelerate the basolaminar deposit formation and RPE dysfunction seen in these conditions.

Academic Significance and Societal Importance of the Research Achievements

加齢黄斑変性は我が国における高齢者の社会的失明原因として重要である。今回の研究で、加齢黄斑変性初期病変とオートファジーの関連を検討し、網膜色素上皮細胞におけるリソソーム膜タンパクLAMP2の重要性を明らかにすることで、新たな病態モデル動物を開発した。

Report

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

    (3 results)

All 2020 2019 Other

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

  • [Int'l Joint Research] Massashusetts Eye and Ear Infirmary(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Genetic LAMP2 Deficiency Accelerates the Age-Associated Formation of Basal Laminar Deposits in the Retina2019

    • Author(s)
      Shoji Notomi, Demetrios G Vavvas
    • Journal Title

      Proc Natl Acad Sci U S A

      Volume: 116(47) Issue: 47 Pages: 23724-23734

    • DOI

      10.1073/pnas.1906643116

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] リソソーム膜タンパクLAMP2欠損マウスにおける色素上皮下沈着物の解析2020

    • Author(s)
      納富 昭司
    • Organizer
      第124回日本眼科学会総会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2022-01-27  

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