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Transmembrane signal transduction in vascular smooth muscle and endothelial cells and physilogic responese

Research Project

Project/Area Number 61570416
Research Category

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

Allocation TypeSingle-year Grants
Research Field Circulatory organs internal medicine
Research InstitutionKobe University

Principal Investigator

YOKOYAMA Mitsuhiro  Kobe University School of Medicine, associate professor, 医学部, 助教授 (40135794)

Co-Investigator(Kenkyū-buntansha) 山崎 享  神戸大学, 医学部・附属病院, 医員
TAKEUCHI Motoshi  Kobe University Hospital, assistant professor, 医学部附属病院, 助手 (50188166)
矢谷 暁人  神戸大学, 医学部・附属病院, 医員
市川 靖典  神戸大学, 医学部・附属病院, 医員
AKITA Hozuka  Kobe University School of Medicine, assistant professor, 医学部, 助手 (60175792)
YATANI Akihito  Kobe University Hospital, medical staff
ICHIKAWA Yasunori  Kobe University Hospital, medical staff
YAMASAKI Tohru  Kobe University Hospital, medical staff
山崎 亨  神戸大学, 医学部, 医員
藤井 隆  神戸大学, 医学部, 医員
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsVascular Smooth Muscle Cells / Serotonin / Norepinephrine / Histamine / Inositol phospholipids / Protein kinase C / Phorbol esters / ホルボール エステル / 血管平滑筋 / ホスファチジールイノシトール代謝 / Cキナーゼ / ホルボールエステル / 血管収縮 / 血管拡張
Research Abstract

Monoamines such as norepinephrine, serotonin, and histamine are potent vasoconstrictors. The goal of this study was to examine receptor-mediated hydrolysis of membrane inositol phospholipids and its regulation, which results in the generation of two intracellular second messengers, inositol 1,4,5-trisphosphate(IP3) and diacylglycerol in vascular smooth muscles. We adopted ^<32>Pi labeling method in intact aortic ring preparatin and ^3H-inositol labeling method in cultured aortic smooth muscle cells obtained from rabbits. These amines stimulated phosphoinositides breakdown dose-dependently through <alpha>^2-adrenergic, 5HT2 and H1 receptor activations. Phosphatidylinositol labeling curve and contractin curve for each agonist were similar. We found that a guanine nucleotide inhibitory (Gi) protein coupled 5HT receptor to phospholipase C and phorbol esters such as TPA modulated 5HT-stimu-lated hydrolysis of inositol phospholipids. Specific regulatory mechanisms for each agonist may exist between receptor activatin and phosphoinositides breakdown, as early degradation and resynthesis of phosphoinositides (PI,PIP and PIP2) in response to each agonist were different. Phosphoinositides labeling and the contractin induced by these amines were differently coupled with the influx of extracellular Ca^<++> influx. Receptor-mediated phosphoinositides breakdown was regulated by cyclic nucleotides ( cyclic AMP and cyclic GMP ). Phorbol esters such as TPA induced a sustained contraction of isolated rabbit aorta that was entirely dependent on intracellular Ca^<++>. TPA inhibited the endothelium dependent relaxation induced by acetylcholine, but not the nitroglycerin-induced relaxation.

Report

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

    (13 results)

All Other

All Publications (13 results)

  • [Publications] M.Yokoyama et al: under preparation.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] M.Go et al: Biochemical and biophysical research communications.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K.Awano et al: Journal of Cardiovascular Pharmacology.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] M.Yokoyama et al: Journal of molecular and cellular cardiology.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 横山光宏,秋田穂束,川原康洋,福崎恒: 脈管学. 28. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 横山光宏,秋田穂束,栗野孝次郎: 動脈硬化. 16. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 日高弘義,亀山正邦,田中利男,横山光宏,栗野孝次郎,秋田穂束,福崎恒編集: "血管の攣縮" HBJ出版局, (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 松尾理,鈴木宏治,池田康夫,横山光宏,秋田穂束,福崎恒編集: "血栓形成と血栓溶解" 日本科学技術協会, (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] M. Go et al: "Phorbol ester modulates serotonin-stimulated phosphoinositides breakdown in cultured vascular smooth muscile cells" Biochemical and biophysical research communications.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] K. Awano et al: "Role of serotonin, histamine and thromboxane A2 in platelet induced contractions of coronary arteries and aortae from rabbits" Journal of Cardiovascular Pharmacology.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] M.Yokoyama et al: "Phosphoinositides metabolism and its regulatin by Ca^<++> influx and cyclic nucleotides in vascular smooth muscle" Journal of Melecular and Cellular Cardiology.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] M. Yokoyama et al: "The mechanisms of phorbol ester-induced contraction of rabbit thoracic aortas:possible involvement of protein kinase C and the lipoxygenase pathway"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Mitsuhiro Yokoyama et al: British Pharmacological Journal.

    • Related Report
      1986 Annual Research Report

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

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