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Significance of chromium in the ocular tissue

Research Project

Project/Area Number 09671805
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Ophthalmology
Research InstitutionNagasaki University

Principal Investigator

AMEMIYA Tsugio  Medical School, Nagasaki University, Professor, 医学部, 教授 (60026862)

Co-Investigator(Kenkyū-buntansha) BHUTTO Imran ahmed  Medical School, Nagasaki University, Assistant, 医学部, 助手 (20284680)
KITAOKA Takashi  Medical School, Nagasaki University, Assistant Professor, 医学部, 助教授 (80234235)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsChromium / retina / diabetes mellitus / rat / trace element / electron microscope / 糖尿病網膜症 / 白内障 / 糖尿病性網膜症 / 眼
Research Abstract

Chromium-deficient diet was made by ourselves. Wistar Kyoto rats were fed this diet 20 days after birth. After fed on the deficient diet for 5 or 6 months, blood sugar level became high: it suggests a tendency of diabetes mellitus. Every one hour after light on in the room eyes were enucleated and the retina was fixed in 4% glutaraldehyde and 1% osmic acid to observe with an electron microscope. The laboratory room was kept in 12 hour light and 12 hour dark cycle.
Electron microscopic findings: No abnormal ultrastructural findings were found in each retinal cell at any hour after light on. However, the retinal pigment epithelial cells showed many lamellar structures at any enucleation hours. Although the number of lamellar structures in the normal rat was maximal at 2 hours after light on, then decreased until 4 hours and almost reached to zero after this, the retinal pigment epithelial cells of Cr-deficient rats had maximal number of lamellar structures at 2 hours after light on, but rather many were still kept after 4 hours. These lamellar structures were phagocytized discs of the photoreceptor outer segment. Thus chromium deficiency might induce abnormal function for digestion and breakdown of phagocytized outer segment discs in the retinal pigment epithelium or chromium might induce abnormal circadian rhythm. Therefore, it is considered that chromium is related to the phogocytotic function of the pigment epithelial cells.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 雨宮次生: "眼と栄養"日本眼科学会雑誌. 103巻. 829-850 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 上田佳子、宮華青、宮村紀毅、雨宮次生: "Cr欠乏ラットにおける網膜の電子顕微鏡的観察"日本眼科学会雑誌. 103巻. 123 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tsugio Amemiya: "The eye and nutrition"J Jpn Ophthalmol Soc. 103(12). 829-850 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yoshiko Ueda, Huaqing Gong, Noritake Miyamura, Tsugio Amemiya: "Electron microscopic observation of the retina of chromium-deficient rats"J Jpn Ophthalmol Soc. 103(3). 123 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 雨宮次生: "眼と栄養"日本眼科学会雑誌. 103巻12号. 829-850 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 上田佳子、官華青、宮村紀毅、雨宮次生: "Cr欠乏ラットにおける網膜の電子顕微鏡的観察"日本眼科学会雑誌. 103巻3号. 123 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Miyamura,N.,Bhutto,I,A.Amemiya,T.: "Retinal Capillary changes in Otsuka Long Evans Tokushima Fatty Rat" Ophtalmic Research. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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