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The role of pigment production of retinal pigment epithelium in the pathogenesis of age-related macular degeneration.

Research Project

Project/Area Number 20K18389
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Hiroki Tsujinaka  奈良県立医科大学, 医学部, 学内講師 (50596749)

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: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords加齢黄斑変性 / 網膜色素上皮 / 喫煙 / ブルーライト / iPS由来網膜色素上皮細胞 / メラニン量 / 青色光 / 網膜色素上皮細胞 / ハイドロキノン
Outline of Research at the Start

加齢黄斑変性などの病的状態では、色素上皮の機能不全に伴い、黄斑部の色素ムラが発生することが知られている。これには、色素上皮細胞数そのものの減少の可能性もあるが、色素上皮のメラニン産生能力が低下しているとも考えられる。
しかし、これまで多く用いられてきた培養色素上皮細胞は生体的色素上皮細胞とは異なりも
ともと色素の産生能が低いものが多く、メラニン色素の研究がほとんどなされていないのが
現状である。本研究では、病的状態における黄斑部に生じる色素ムラが起こる原因を究明し、加齢黄斑変性の発生機序解明ならびに治療法の開発につなげる、ということを目標とする。

Outline of Final Research Achievements

Abnormal pigmentation or depigmentation of the retinal pigment epithelium (RPE) is a known precursor lesion of Neovascular age-related Macular degeneration (nAMD). We evaluated the effect of Hydroquinone (HQ) on melanin production using RPE cells. iPS - derived RPE and ARPE-19 cells were cultured with HQ. Realtime RT-PCR revealed that the expression of melanin-related production genes was signifi-cantly decreased by the addition of HQ for 1 day. The absorbance of RPE suspension was de-creased, especially in the blue light. On the other hand, melanin expression was significantly in-creased after the addition of HQ for 1 week. After the blue light irradiation, VEGF in the RPE medium was significantly higher with HQ for 1 week than the control group. HQ-induced changes in melanin production may be responsible for the uneven pigmentation of RPE.It was suggested that uneven melanin levels in RPE may affect VEGF production and influence the development of nAMD.

Academic Significance and Societal Importance of the Research Achievements

加齢黄斑変性は、中途失明の原因として社会的に大きな問題となっており、あらたな治療法が模索されている疾患でもある。これまで、加齢黄斑変性の発症に、網膜色素上皮細胞の色素むらが前駆病変として指摘されていたが、その原因や、病態における役割は不明であった。今回、色素上皮のむらによって、加齢黄斑変性の発症要因となるVEGFの発現量が変化することを突き止めたことは、病態解明にとって大きな意味を持つと考えらえる。色素上皮のむらを解消するための薬剤や、治療法がみつかれば、加齢黄斑変性の発症そのものを抑制できる可能性を秘めており、今後、これらの薬剤が加齢黄斑変性抑制のブレイクスルーになるかもしれない。

Report

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

    (13 results)

All 2022 2021 2020 2019

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 7 results) Presentation (5 results) Book (1 results)

  • [Journal Article] Acute retinal necrosis in a patient on immunosuppressive treatment for COVID-19 pneumonia: a case report2022

    • Author(s)
      Nishiyama Takeyuki、Tsujinaka Hiroki、Mizusawa Yutaro、Ueda Tetsuo、Ogata Nahoko
    • Journal Title

      BMC Ophthalmology

      Volume: 22 Issue: 1 Pages: 462-462

    • DOI

      10.1186/s12886-022-02692-5

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Differences in clinical characteristics and treatment outcomes of submacular hemorrhage caused by age-related macular degeneration and retinal macroaneurysms: A multicenter survey from the Japan Clinical Retina Study (J-CREST) group2022

    • Author(s)
      Kimura Takeshi、Araki Takashi、Yasukawa Tsutomu、Kato Aki、Kuwayama Soichiro、Kinoshita Takamasa、Okamoto Fumiki、Murakami Tomoya、Mitamura Yoshinori、Sakamoto Taiji、Terasaki Hiroto、Kusuhara Sentaro、Miki Akiko、Takamura Yoshihiro、Kondo Mineo、Matsubara Hisashi、Ueda Tetsuo、Tsujinaka Hiroki、Gomi Fumi
    • Journal Title

      PLOS ONE

      Volume: 17 Issue: 9 Pages: 0274508-0274508

    • DOI

      10.1371/journal.pone.0274508

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Visual prognosis of submacular hemorrhage secondary to age-related macular degeneration: A retrospective multicenter survey2022

    • Author(s)
      Inoue Naomi、Kato Aki、Araki Takashi、Kimura Takeshi、Kinoshita Takamasa、Okamoto Fumiki、Murakami Tomoya、Mitamura Yoshinori、Sakamoto Taiji、Miki Akiko、Takamura Yoshihiro、Matsubara Hisashi、Tsujinaka Hiroki、Gomi Fumi、Yasukawa Tsutomu
    • Journal Title

      PLOS ONE

      Volume: 17 Issue: 7 Pages: 0271447-0271447

    • DOI

      10.1371/journal.pone.0271447

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 36.Treatment of diabetic macular edema in real-world clinical practice: the effect of aging.2022

    • Author(s)
      Japan Clinical Retina Study (J-CREST) group
    • Journal Title

      Journal of Diabetes Investigation

      Volume: 1 Issue: 8 Pages: 1-8

    • DOI

      10.1111/jdi.13801

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Clinical implications of pachyvessels in polypoidal choroidal vasculopathy2020

    • Author(s)
      Ijuin Nobuo、Tsujinaka Hiroki、Hirai Hiromasa、Jimura Hironobu、Nakao Shigeya、Yamashita Mariko、Nishi Tomo、Ueda Tetsuo、Ogata Nahoko
    • Journal Title

      BMC Ophthalmology

      Volume: 20 Issue: 1 Pages: 170-170

    • DOI

      10.1186/s12886-020-01443-8

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sustained delivery of acriflavine from the suprachoroidal space provides long term suppression of choroidal neovascularization2020

    • Author(s)
      Hackett Sean F.、Fu Jie、Kim Yoo Chun、Tsujinaka Hiroki、Shen Jikui、Lima e Silva Raquel、Khan Mahmood、Hafiz Zibran、Wang Tao、Shin Matthew、Anders Nicole M.、He Ping、Ensign Laura M.、Hanes Justin、Campochiaro Peter A.
    • Journal Title

      Biomaterials

      Volume: 243 Pages: 119935-119935

    • DOI

      10.1016/j.biomaterials.2020.119935

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Real-world management of treatment-naive diabetic macular oedema: 2-year visual outcome focusing on the starting year of intervention from STREAT-DMO study2019

    • Author(s)
      Shimura M, Kitano S, Muramatsu D, Fukushima H, Takamura Y, Matsumoto M, Kokado M, Kogo J, Sasaki M,
    • Journal Title

      Br J Ophthalmol

      Volume: - Issue: 12 Pages: 1755-1761

    • DOI

      10.1136/bjophthalmol-2019-315726

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ヒドロキノン(HQ)添加による網膜色素上皮細胞のメラニン量変化2022

    • Author(s)
      西山武孝、辻中大生、上田哲生、緒方奈保子
    • Organizer
      日本眼科学会
    • Related Report
      2022 Annual Research Report 2021 Research-status Report
  • [Presentation] ヒドロキノン(HQ)添加による網膜色素上皮細胞のメラニン量変化2022

    • Author(s)
      西山武孝、辻中大生、上田哲生、緒方奈保子
    • Organizer
      臨床眼科学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] COVID-19感染後にEBウイルス起因と思われる急性網膜壊死を発症した1例2021

    • Author(s)
      西山武孝 辻中大生 水澤裕太郎 緒方奈保子
    • Organizer
      日本臨床眼科学会
    • Related Report
      2021 Research-status Report
  • [Presentation] 網膜色素上皮の色素産生能に喫煙が与える役割2021

    • Author(s)
      西山武孝 辻中大生 平井宏昌 上田哲生 緒方奈保子
    • Organizer
      日本眼科学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 術中光干渉断層計(OCT)併用で傍中心部角膜穿孔に層状角膜移植術を施行した一例2020

    • Author(s)
      西山 武孝 辻中 大生 慶田 真喜子 丸岡 真治 緒方 奈保子
    • Organizer
      日本臨床眼科学会
    • Related Report
      2020 Research-status Report
  • [Book] 抗VEGF治療セミナー 101 加齢黄斑変性の予後予測因子2022

    • Author(s)
      辻中 大生
    • Total Pages
      2
    • Publisher
      あたらしい眼科
    • Related Report
      2022 Annual Research Report

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

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