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Studies on putative transmitter substances at the inner plexiform layer of the retina.

Research Project

Project/Area Number 59480110
Research Category

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

Allocation TypeSingle-year Grants
Research Field Neurophysiology and muscle physiology
Research InstitutionSt. Marianna University School of Medicine

Principal Investigator

TOYODA Jun-ichi  St. Marianna Univ. School of Med., 医学部, 教授 (90081629)

Co-Investigator(Kenkyū-buntansha) KUJIRAOKA Toru  ibid., 医学部, 助手 (40130992)
FUJIMOTO Masaaki  ibid., 医学部, 講師 (90081728)
冨田 恒男  聖マリアンナ医科大学, 医学部, 客員教授 (80090116)
TOMITA Thuneo  St. Marianna Univ. School of Med.
Project Period (FY) 1984 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1986: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1985: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1984: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsRetina / Bipolar cell / Amacrine cell / Synaptic transmission / Transmitter / Glutamate
Research Abstract

1. Synaptic transmission from bipolar to amacrine cells: Responses of a bipolar and an amacrine cell were recorded simultaneously. Artificial depolarization of the bipolar cell by current elicited a depolarizaiton in the amacrine cell. The results confirmed the excitatory action of bipolar cell transmitters.
2. Effect of putative transmitters on amacrine cells: Effects of drugs on amacrine cells were tested by applying these drugs iontophoretically near the cells recorded.
3. Drugs having an excitatory action: Aspartate, glutamate and Ach showed a depolarizing effect which was not blocked by cobalt ions. Thus amacrine cells appeared to have receptors for these agents. Though glutamate is one of strong candidates for bipolar transmitter, its release must be verified.
4. Drugs having an inhibitory action: GABA and glycine showed an inhibitory effect on amacrine cells. The effect could be mediated partly through bipolar cells but also directly on amacrine cells.
5. Effect of drugs on retinal spreading depression(SD): SD can be induced by exposing the retina to a high K or low Cl medium. It is suspected that SD is due to the abonormal excitation of the neurons in the inner retina. It may therefor serve as an index for the excitability of ganglion and amacrine cells. Effect of drugs used in the above experiments was also tested on SD. An excitatory action of Ach and an inhibitory action of GABA and glysine were confirmed. But the effect of glutamate was variable. Further experiments are necessary before accepting glutamate as a bipolar cell transmitter.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 藤本正昭: 医学と生物学. 111. 89-91 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 藤本正昭: 医学と生物学. 111. 351-353 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 藤本正昭: 医学と生物学. 112. 203-204 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kujiraoka,T: Neuroscience Research. Suppl.4. S111-S119 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Fujimoto,M: Neuroscience Research. Suppl.4. S197-S208 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Toyoda,J: Neuroscience Research.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Fujimoto, Masaaki: "Effects of GABA and glycine on retinal spreading depression in low <Cl^-> media." Medicine and Biology. 111. 89-91 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Fujimoto, Masaaki: "Effects of GABA and glycine on the occurrence of retinal spreading depression." Medicine and Biology. 111. 351-353 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kujiraoka, Toru: "Bipolar-amacrine transmission: Effect of polarization of bipolar cells on amacrine cells in the carp retina." Neuroscience Research. Suppl. 4. S111-S119 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Fujimoto, Masaaki: "The spreading depression potential and the ERG b-wave in retinas of the frog and chick." Neuroscience Research. Suppl. 4. S197-S208 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Toyoda, Jun-ichi: "Effect of some putative transmitters on amacrine cells and on spreading depression potential." Neuroscience Research. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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