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Role of sphingosine 1-phosphate 3 signaling in choroidal neovascularization and fibrosis.

Research Project

Project/Area Number 21K16879
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

IWANISH HIROKI  和歌山県立医科大学, 医学部, 准教授 (40784319)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywordsスフィンゴシン-1-リン酸 / レーザー誘発脈絡膜新生血管 / TGFb / 創傷治癒 / 滲出型加齢黄斑変性 / 脈絡膜新生血管 / S1P / レーザー誘発CNV
Outline of Research at the Start

S1PR3シグナルのレーザー誘発CNVモデルでの治療効果の全容を解明し、S1PR2シグナルとの関係をも明らかにする。CNV治療でのS1Pを標的とした場合の適切な標的受容体を提言し、今後の治療戦略につなげる。

Outline of Final Research Achievements

Laser-induced choroidal neovascularization (CNV) was significantly suppressed in S1P3-deficient mice, and the expression of inflammatory cytokines, including TGFb, was decreased in laser-irradiated tissues. There was no significant difference in laser-induced CNV after reciprocal bone marrow transplantation between S1P3-deficient and wild-type mice. Immunostaining showed increased expression of S1P2 in laser-induced CNV tissue from S1P3-deficient mice.
Systemic administration of an S1P2 selective inhibitor to S1P3-deficient mice did not enhance neovascular suppression. In vitro tube formation assays also showed no additional effect of S1P2 inhibition on lumen formation in response to S1P3 inhibition.

Academic Significance and Societal Importance of the Research Achievements

加齢黄斑変性は先進国中途失明原因の上位疾患である。滲出型加齢黄斑変性に対して臨床的に抗VEGF抗体の硝子体内注射が有効であるが、一度退縮した新生血管の再燃による繰り返し投与とそれに伴う高額な医療費、治療中の線維瘢痕化に伴う不可逆的視力障害などの課題がある。
本研究で、マウスモデルで滲出型加齢黄斑変性における新生血管へのS1P受容体レベルでの関与を証明した。S1P3シグナル抑制によるTGFbシグナルの抑制も認めた。シグナル補完に関しては、血管新生抑制に関してS1P2とS1P3同時阻害による追加作用はなかった。S1P3シグナル単独抑制が滲出型加齢黄斑変性の新たな治療ターゲットになり得ると結論付けた。

Report

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

    (2 results)

All 2023

All Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Suppression of the growth of lase-induced CNV by lacking S1Pr3 is not exaggerated by pharmacological inhibition of S1Pr2 in mice.2023

    • Author(s)
      Hiroki Iwanishi; Takayoshi Sumioka; Shingo Yasuda; Kousuke NIshi; Kana Ichikawa; Masayasu Miyajima; Yuka Okada; Shizuya Saika
    • Organizer
      ARVO Annual Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] S1P3受容体3型欠損マウスでの実験的レーザー誘発脈絡膜新生血管の抑制2023

    • Author(s)
      岩西宏樹、住岡孝吉、西晃佑、安田慎吾、市川加奈、宮嶋正康、雑賀司珠也
    • Organizer
      第127回日本眼科学会総会
    • Related Report
      2023 Annual Research Report

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

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