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Relationship between levels of brain peptides and metabolism of ammonia and glutamate in LEC rats spontaneously develop fulminant hepatitis

Research Project

Project/Area Number 03670375
Research Category

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

Allocation TypeSingle-year Grants
Research Field Gastroenterology
Research InstitutionIwate Medical University

Principal Investigator

SATO Shunichi  Iwate Medical University, First Department of Internal Medicine, Professor, 医学部, 教授 (10048275)

Co-Investigator(Kenkyū-buntansha) MADARAME Takeo  Iwate Medical University, First Department of Internal Medicine, Research Associ, 医学部, 助手 (40209466)
KATO Akinobu  Iwate Medical University, First Department of Internal Medicine, Research Associ, 医学部, 助手 (50177424)
SUZUKI Kazuyuki  Iwate Medical University, First Department of Internal Medicine, Associate Profe, 医学部, 助教授 (00137499)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1991: ¥900,000 (Direct Cost: ¥900,000)
Keywordsfulminant hepatitis / hepatic encephalopathy / LEC rat / brain peptide / CCK / neurokinin A&B / amino acid / ammonia / CLK / neurokinin A&B / somatostatin
Research Abstract

Relationship between levels of brain peptides (CCK, somatostatin,and neurokinin A&B) and metabolism of ammonia and glutamate were studied in the brain and blood of LEC rats. Influence of glutamate receptor antagonist (MK801) on convulsion and brain metabolism of glutamate in rats with acute ammonia toxication was also examined.
Following results were obtained. (1) Degree of hepatic encephalopathy significantly correlated with blood ammonia and plasma aromatic amino acids, suggesting the usefulness of LEC rats as a new model for acute hepatic encephalopathy. (2) Levels of CCK immunoreactivity (41.5*2.6pmol/g wet wt) in water extract from the brain of LEC rats with hepatic encephalopathy were significantly lower than those in LEC rats without hepatic encephalopathy (67.1*6.9). (3) Number of CCK-immunoreactive cells per field (x125) was 28.5*0.7 in rats without hepatic encephalopathy, and 14.1*2.0 in rats with stage III to V hepatic encephalopathy. A decrease in CCK-immunoreactive nerve ce … More lls was not observed in the rats with stage I or II hepatic encephalopathy. (4) Levels of both somatostatin-14-like immunoreactivity and somatostatin-28-(1-12)-like immunoreactivity in the brain (hypothalamus, medulla oblongata, striatum and spinal cord) of LEC rats with hepatic encephalopathy were significantly lower than those in LEC rats without hepatic encephalopathy. (5) Levels of neurokinin B(NKB) immunoreactivity in the striatum and spinal cord of LEC rats with hepatic encephalopathy were significantly reduced compared to those in LEC rats without hepatic encephalopathy. Levels of NKB immunoreactivity significantly correlated with blood ammonia but no correlated with levels of plasma aromatic amino acids. No significant reduction was found in levels of neurokinin A immunoreactivity. (6) Decrease in glutamate and GABA level and increase in glutamine level were observed in the brain of LEC rats with hepatic encephalopathy. Levels of these data were changed at different portion of the brain. (7) Incubation time until convulsion was significantly shorter in the rats pretreated with MK801, glutamate receptor antagonist than in rats with out 801. These data indicate that ammonia toxicity may be accelerated by MK801 which interferes in glutamine formation from glutamate in rats with acute ammonia toxication. Less

Report

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

    (22 results)

All Other

All Publications (22 results)

  • [Publications] K.Tateishi,S.Sato et al.: "Reduced cholecystokinin in the brain of LEC rats with hepatic encephalopathy." Regulatory Peptides. 35. 95-101 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Madarame,S.Sato et al.: "Decreased Numbers of cholecystokinin-Immunareactive Nerse cells in the Cerebral Cortex of LEC Rats with a Hereditary Hepatitis." Neuropeptides. 22. 229-233 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Tateishi,S.Sato et al.: "Reduced somatostatin-like immunoreactivity in the baiu of LEC rats with hepatic encephalopathy." Regulatory Peptides. 36. 131-139 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 立石 カヨ子,佐藤 俊一ほか: "肝性脳症発症後のLECラットの脳脊髄におけるneurokininAおよびneurokininB免疫活性の変動." 医学のあゆみ. 160. 153-154 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 鈴木 一幸,佐藤 俊一ほか: "急性アンモニア負荷ラットの神経症状ならびに脳内グルタミン酸,グルタミン代謝に及ぼすグルタミン酸受容体拮抗薬(MK801)の影響." 医学のあゆみ. 162. 231-232 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 加藤 隆幸,佐藤 俊一ほか: "肝性脳症における脳内部位別神経伝達アミノ酸動態:肝炎自然発症LECラットを用いた検討" 肝臓. 33(Suppl). 205- (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tateishi K and Sato S et al.: "Reduced cholecystokinin in the brain of LEC rats with hepatic encephalopathy" Regulatoty Peptides. 35. 95-101 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Madarame T and Sato S et al.: "Decreased numbers of cholecystokinin- Immunoreactive nerve cells in the cerebral cortex of LEC rats with a hereditary hepatitis" Neuropeptides. 22. 229-233 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tateishi K and Sato S et al.: "Reduced somatostatin-like immunoreactivity in the brain of LEC rats with hepatic encephalopathy" Regulatory Peptides. 36. 131-139 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tateishi K and Sato S et al.: "Changes in immunoreactivity of neurokinin A and B in the brain and spinal cord of LEC rats with hepatic encephalopathy" J.Clinical and Experimental Medicine(IGAKU NO AYUMI). 160. 153-154 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Suzuki K and Sato S et al.: "Influence of glutamate receptor antagonist (MK801) on convulsion and brain metabolism of glutamate in rats with acute ammonia toxication." J.Clinical and Experimental Medicine (IGAKU NO AYUMI). 162. 231-232 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kato T and Sato S et al.: "Changes of amino acids for neurotransmitter in hepatic encephalopathy of LEC rats with a hereditary hepatitis" Acta Hepatologica Japonica. 33 (Suppl.). 205 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.madarame,S,Sato et al.: "Decriased Numbers of cholecystokinin Immuno-reactive Nerve Cells in the Cerebral Cortex of LEC Rats with a Hereditary Hepatitis." Neuropeptides. 22. 229-233 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 立石 カヨ子,佐藤 俊一ほか: "肝性脳症発症後のLECラットの脳脊髄におけるneurokinin Aおよびneurokinin B 免疫活性の変動。" 医学のあゆみ. 160. 153-154 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 鈴木 一幸,佐藤 俊一ほか: "急性アンモニア負荷ラットの神経症状ならびに脳内グルタミン酸,グルタミン代謝に及ぼすグルタミン酸受容体拮抗薬(MK801)の影響。" 医学のあゆみ. 162. 231-232 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 加藤 隆幸,佐藤 俊一ほか: "肝性脳症における脳内部位別神経伝達アミノ酸動態:肝炎自然発症LECラットを用いた検討。" 肝臓. 33(Suppl). 205 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 鈴木 一幸,佐藤 俊一ほか: "急性アンモニア負荷ラットの神経症状ならびに脳内グルタミン酸,グルタミン代謝に及ぼすグルタミン酸受容体拮抗薬(MK801)の影響。" 肝臓. 33(Suppl). 301 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Sato,A.Kato et al.: "LEC (Long Evans Cinnamen)Rats with Spontaneous Hepatitis as a Model of Hepatic Encephalopathy." The Journal of Iwate Medical Association. 45. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Tateishi,K.et al.: "Reduced cholecystokinin in the brain of LEC rats with hepatic lniephalopathy" Regulatouy Peptides. 35. 95-101 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Tateishi,K.et al.: "Reduced somatostatinーlike immnoreactivity in the bwin of LEC rats hepatic emcephalopaihy" Regulatouy Peptides. 36. 131-139 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 鈴木 一幸ほか: "急性アンモニア負荷ラットの神経症状ならびに脳内グルタミン酸・ダルタミン代謝に及ぼすグルタミン酸受容体拮抗薬(MK801)の影響" 貯臓(第28回日本肝臓学会総会). 33,Supl. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 加藤 隆幸ほか: "肝性脳症における脳内部位別神経伝達アミノ酸動態:肝炎自然発症LECラットを用いた検討" 肝臓(第28回日本肝臓学会総会). 33,Supl. (1992)

    • Related Report
      1991 Annual Research Report

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

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