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ESR studies on the effects of bile acids and oxygen radicals on rat hepatocytes

Research Project

Project/Area Number 61570350
Research Category

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

Allocation TypeSingle-year Grants
Research Field Gastroenterology
Research InstitutionKyoto Prefectural University of Medicine

Principal Investigator

NAKASHIMA Toshiaki  Kyoto Prefectural University of Medicine, Research assistant, 医学部, 助手 (00150574)

Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1987: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1986: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsBile acids / ESR spin labelling / Rat primary cultured hepatocytes / Rat hepatic microsomes / membrane fluidity / Free radical / 酸素(カルシウム)・パラドックス / ラット肝細胞小器官膜 / 閉塞性黄疸
Research Abstract

To elucidate the patho physiological effects of bile acids and active oxygen radicals on hepatocytes, first, the effects of bile acids on the fluidity of liver microsomal membranes were examined according to ESR-spin labelling method. Unconjugated bile acids decreased the fluidity of shallow portion of membranes which was estimated by using 5-doxyl stearic acid as a spin probe, while taurine or glycine conjugated bile acids increased the fluidity, relatively. Ethanol increased the fluidity of membranes especially at deep portion which was estimated by 12-doxyl stearic acid and ethanol enhanced the increment of the fluidity induced by conjugated bile acids, additively.
The degradation of spin probes as free radicals in plasma membranes of isolated hepatocytes was also investigated by using ESR. The regradation rate was influenced by both hepato-cellular antioxidants content and temperature. The correlation between the rate and the fluidity was also demonstrated.
On the other hand, the parado xical effects of oxygen and calcium on hepatocytes which were well-known as oxygen(calcium) paradoxes were examined to elucidate the involvement of oxygen radicals, mainly superoxides(O_2 ^-),in hepatocellular damages. Because O_2 ^- formation was enhanced by hyperbaric condition, the presence of Ca ^<++> and membrane damages, drugs such as dismutase of active oxygen, calcium antagonist and membrane stabillizer were effective in protecting against cell injury in these paradoxes. Although ESR spin trapping of oxygen radicals was performed, radical addacts were not available in isolated hepatocytes.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 中嶋俊彰,他: 含硫アミノ酸. 9. 239-244 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 中嶋俊彰,他: 過酸化脂質研究. 10. (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 中嶋俊彰,他: 肝臓. 28. 1133-1134 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 中嶋俊彰,他: アルコール代謝と肝. 7. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 島俊英,他: 含硫アミノ酸. 10. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 島俊英,他: 日本消化器病学会雑誌. 85. 756 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshiaki NAKASHIMA,et al.: "Medical,Biochemical and Chemical Aspects of Free Radicals" Elsevier Science Publishers, (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshiaki NAKASHIMA, et al.: "Hypoxia/reoxygenation injury of isolated hepatocytes and tauirne" Sulfur Amino Acids. 9. 239-244 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshiaki NAKASHIMA, et al.: "The oxygen paradox and the calcium paradox in the isolated rat hepatocytes" Acta Hepatologica Jpn. 28. 1133-1134 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshiaki NAKASHIMA, et al.: "Effects of alcohol and bile acids on the fluidity of hepatic microsomal membranes" Alcohol Metabolism and Liver. 7. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshihide SHIMA, et al.: "Changes of the fluidity of hepatic microsomal membranes of rats induced by bile acids and taurine" Sulfur Amino Accids. 10. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshihide SHIMA,et al.: "Changes of bile acid composition and hepatic microsomal membrane lipid fluidity in bile duct-ligated rat - ESR spin label study" Jpn J Gastroenterol. 85. 756 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Toshiaki NAKASHIMA, et al.: Studies on the oxygen, calcium paradox in isolated rat hepatocytes. Medical, biochemical and chemical aspects of free radicals, Elsevier Science Publishers, (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary

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

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