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Pathophysiobgical Study of Retinal Ischenia-with Ion-seledive Microelectrode

Research Project

Project/Area Number 03404051
Research Category

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

Allocation TypeSingle-year Grants
Research Field Ophthalmology
Research InstitutionKyoto University

Principal Investigator

HONDA Yoshihito  Kyoto University, Ophthaluclagy, Professo, 医学部, 教授 (90026930)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Fumiaki  Kyoto University, Ophthaluclagy, Associate Professo, 医学部, 助手 (60191441)
YOSHIMURA Nagahisa  Kyoto University, Ophthaluclagy, Associate Professo, 医学部, 講師 (70211662)
千原 悦夫  京都大学, 医学部, 助教授 (20111958)
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥18,000,000 (Direct Cost: ¥18,000,000)
Fiscal Year 1993: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1992: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1991: ¥10,000,000 (Direct Cost: ¥10,000,000)
KeywordsElectroretinogram / Ishemia / Potassium ion / Hydrogen ion / Microelectrode / Free radical / SOD / Catalase / ネコ網膜 / 色素上皮細胞
Research Abstract

We studied the electrophysiological change of the retina during ischemia-reperfusion in vivo cat. The electroretinogram (ERG), intraretinal ERG with microelectrodes and the change of ion concentration in the retina were recorded. In order to observe the change in potentials during reperfusion, retinal ischemia was induced by raising intraocular pressure. The ERG b- and c-wave after 10-30 minutes of ischemia were gradually recovered in 6 hours of reperfusion. After 30 minutes of ischemia complete recovery was not observed. To investigate the role of free radicals in reperfusion injury, superoxide dismutase and catalase, which were free radical scavengers, were given intravenously. Both agents did not show the significant improvement of ERG, although during early period the remarkable recovery of c-wave was observed. The intraretinal recordings showed similar recovery to the ERG.The photoreceptors and retinal pigment epithelium vere also damaged. The fact that the light-evoked alkalinizaton outside photoreceptors was reduced few hous after reperfusion suggests the reduction of photoreceptor's metabolism. The decrease of light-evoked [K+] change in that space suggests that the ion channel or pump function of photoreceptors is reduced.

Report

(4 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Fumiaki Yamamoto: "Effects of ischemia-reperfusion on light-evoked alkalinization outside rod photoreceptors in the cat retina" Ophthalmic Research. 25. 371-377 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fumiaki Yamamoto: "Effects of intravenous superoxide dismutase and catalose on electroretinogram in the cat postischemic reting" Ophthalmic Research. (in press). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kano Hiroi: "Intraretinal study of cat electroretinogram during retinal ischemia-reperfusion with K^+-microelectrodes" Investigative Ophthalmology & Visual Science. (in press). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 山本文昭: "イオン選択性ガラス微小電極法による虚血-再灌流網膜の病態生理学的研究" 病態生理. 12. 396-399 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yamamoto, Fumiaki: "Effects of isdnevia-reperfusion on light-eucked alkalinization aitside rod photoreceptors in the cat retina" Ophthalmic Research. 25. 371-377 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yamamoto, Fumiaki: "Effects of intravenous superoxide dismutase and catalase on electroretinogram in the cat post ischemic retina" Ophthalmic Research. (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hiroi, Kano: "Intraretinal study of cat electvoretinagram during retival is chemia-reperfusicn with K_+-microelectrodes" Investigative Ophthaluology & Uisual Science. (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yamamoto, Fumiaki: "Potho physiological study in retina during ischemic-reperfusion with ion-selective micro ole ctrodes"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Fumiaki Yamamoto: "Effects of ischemia-reperfusion on light-evoked alkalinization outside rod photoreceptors in the cat retina" Ophthalmic Research. 25. 371-377 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Fumiaki Yamamoto: "Effects of intravenous superoxide dismutase and catalase in electroretinogram in the cat post-ischemic retina" Ophthalmic Research. (in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Kano Hiroi: "Intraretinal study of cat electroretinogram during retinal ischemia-reperfusion with K^+-microelectrodes" Investigative Ophthalmology & Visual Science. (in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Fumiaki Yamamoto: "Effects of retinal ischemia-reperfusion on pH outside rod photoreceptors in cats." Investigative Ophthalmology & Visual Scieuve(Suppl.). 33. (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Kano Hiroi: "Electrophsiologecal analysis of retinal pigment epithelium function during ischemia-reperfusion by infraretinal K-microelectrode in cats." Inuestigative Ophthalmology & Visual Science(Suppl.). 33. (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 山本 文昭: "イオン選択性ガラス微小電極法による虚血一再潅流網膜の病態生理学的研究" 病態生理. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Yoshihito Honda,Fumiaki Yamamoto,Atsushi Takeuch: "Effects ofsodium iodate on〔H^+〕_0 outside rod photoreceptors in cat." Investigative Pphthalmology 8 Visnal Science(Supple.). 32. 837 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Fumiaki Yamamoto,Yoshihito Honda: "Effects of iodoacetate on〔H^+〕_0 outside rod photoreceptors in cat." 21th Annual Meeting.Society for Neuroscience Absttacts. 17(1). 297 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 坂上 欧,桐生 純一,竹内 篤,山本 文昭,本田 孔士: "エンドセリンの網膜血管に対する作用。" 日本眼科学会雑誌. 96. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Fumiaki Yamamoto,Kano Hiroi,Hiroko Aikawa,Yoshihito Honda: "Effects of retinal ischemiaーreperfusion on pH outside rod photoreceptors in Cats." Inveshgative Ophthalmology 8 Visual Science(Suppl.). 33. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Kano Hiroi,Fumiaki Yamamoto,Hiroko Aikawa,Yoshihito Honda: "Electrophysiological analysis of retinal pigment epthelium function during ischemiaーreperfusion by intraretinal K^+ーmicroclectrodes in cat." Investigative.Ophthalmology 8 Visual Science(Suppl.). 33. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 山本 文昭,桐生 純一,竹内 篤,坂上 欧,本田 孔士: "猫網膜におけるイオン選択性ガラス微小電極法" 日本眼科紀要. 42. 1406-1413 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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