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Effects on Retinal Pigment Epithelium in Vitro of Dopa and Oxygen.

Research Project

Project/Area Number 02454409
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Ophthalmology
Research InstitutionKeio University

Principal Investigator

TANAKA Yasuhiko (1992)  Keio University School of Medicine Associat Professor, 医学部, 助教授 (30051551)

明尾 潔 (1990-1991)  慶應義塾大学, 医学部, 助手 (90146663)

Co-Investigator(Kenkyū-buntansha) AKEO Kiyoshi  Keio University School of Medicine Assistant Professor, 医学部, 非常勤講師 (90146663)
宮田 博  慶應義塾大学, 医学部, 助手 (60174190)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1990: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsRetinal Pigment Epithelium / Melanin / in vitro / Free radicals / Cell growth / Superoxide dismutase / Cell cycle / Dopa / Superoxide dismutase / ド-パ / ス-パ-オキサイドディスミュタ-ゼ / 吸光度 / カタラ-ゼ
Research Abstract

Purpose. It is possible that the effects of L-dopa and oxygen on retinal pigment epithelial (RPE) cells are dependent on tyrosinase activities because melanin precursors and free radicals are produced during melanin synthesis by tyrosinase. We compared these cytotoxic effects of L-dopa and oxygen on cell growth, superoxide dismutase (SOD) activity, and cell cycle of melanotic RPE cells with amelanotic RPE cells.
Methods. We conducted cell count, SOD activity, and flow cytometric DNA analysis of RPE cells exposed to L-dopa (100 muM and 250 muM) changing oxygen concentrations (20%, 10%, and 5%).
Results. Melanotic RPE cells were more tolerant of toxicity of dopa-oxidation than amelanotic RPE cells. SOD activity of RPE cells was increased by exposure to dopa regardless of melanin granules. A dose-dependent effect of L-dopa to arrest the cell cycle (the S phase) was more pronounced in melanotic RPE cells than in amelanotic RPE cells, and oxygen caused arrest in the G_1 phase.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 明尾 潔: "網膜色素上皮細胞の増殖と活性酸素" 活性酸素,フリーラジカル. 3. 402-410 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akeo,K.,Nagasaki,K.,Tanaka,Y.,Curran, S.A.Dorey,C.K.: "Comparison of Effects of Oxygen and Antioxidative Enzymes on Cell Growth bertween Retinal Pigment Epithelial Cells and Vascular Endothelial Cell in vitro" Ophthalmic Research. 24. 357-364 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akeo,K., Nagasaki,K., Tanaka,Y., Curran,S.A., Dorey,C.K.: "Comparison of Effects of Oxygen and Antioxidative Enzymes on Cell Growth between Retinal Pigment Epithelial Cells and Vascular Endothelial Cells in vitro" Ophthalmic Research. 24. 357-364 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 明尾 潔: "網膜色素上皮細胞の増殖と活性酸素" 活性酸素・フリーラジカル. 3. 402-410 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Akeo,K.;Nagasaki,K.;Tanaka,Y.;Curran,S.A.;Dorey,C.K.: "Comparison of Effects of Oxygen and Antioxidative Enzymes on Cell Growth between Retinal Pigment Epithelial Cells and Vascular Endothelial Cells in vitro" Ophthalmic Research. 24. 357-364 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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