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Extracellular matrix in liver cirrhosis : its abnormality and influence on liver functions.

Research Project

Project/Area Number 09670512
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Gastroenterology
Research InstitutionUniversity of Tokyo

Principal Investigator

OGATA Itsuro  Univ.of Tokyo, fac. of Med., Assistant Professor, 医学部・附属病院, 助手 (80169169)

Co-Investigator(Kenkyū-buntansha) YANASE Mikio  Univ.of Tokyo, fac. of Med., Senior Resident, 医学部・附属病院, 医員
TOMIYA Tomoaki  Univ.of Tokyo, fac. of Med., Assistant Professor, 医学部・附属病院, 助手 (90227637)
IKEDA Hitoshi  Univ.of Tokyo, fac. of Med., Assistant Professor, 医学部・附属病院, 助手 (80202422)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,800,000 (Direct Cost: ¥2,800,000)
Keywordsextracellular matrix / Rho-kinase / cirrgotic liver / phospholylation / Hepatic stellate cell / Rho / Rho-kinase / Rho Kinase
Research Abstract

In cirrhotic liver, abundant extracellular matrices and deranged lobular architecture deteriorate the organ-specific function. Hepatic stellate cells (HSCs) transform into myofibroblast-like cells and play an important role in the hepatic fibrogenesis by producing an excess amount of extracellular matrix proteins and contracting the healing wound. We have cloned a serine/threonine protein kinase from a cDNA library prepared from HSC line derived from a CCI_4 induced cirrhotic rat liver. It is identical to the recently-reported Rho-kinase, one of Rho effectors, through which several actomyosin-based cellular processes such as adhesion, cytokinesis, and contraction are regulatcd. This study mainly aimed to clarify the functions of Rho and Rho-kinase in HSCs.
Immunoblot analysis confirmed the protein expression and auto-phosphorylation of Rho-kinase by HSCs, as well as their regulation by Rho-stimulator lysophosphatidic acid (LPA). Contraction assay using type I collagen lattice showed that LPA induced contraction of HSCs in a dose-dependent manner, and its effect was reduced by the addition of C3 exoenzyme, an inactivator of Rho. Protein expression of alpha-smooth muscle actin, a cytoskeletal protein in activated HSCs, was not affected by addition of LPA or C3 exoenzyme. When HSCs were added with fibronectin-coated beads, the subplasmalemmal assembly of focal adhesion complex and related proteins including Rho and Rho-kinase were observed arround the beads, and C3 exoenzyme abrogated the assembly.
From these data, Rho and Rho-kinase might be involved in the intracellular transduction of the signal from extracellular matrices in HSCs.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 尾形逸郎: "Rat liver fat-storing cell lines express sarcomeric myosin heavy chain mRNA and protein." Cell Mot.Cytoskeleton. 26. 125-132 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 尾形逸郎: "Cloning and characterization of a new member of the protein-kinase family from a rat fat-storing cell cDNA library." Hepatology. 18. 169A (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 尾形逸郎: "Up-regulation of type I procollagen C-proteinase enhancer protein messenger RNA in rats with CCl_4-induced liver fibrosis." Hepatology. 26. 611-617 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 池田 均: "Effect of lysophosphatidic acid on proliferation of stellate cells and hepatocytes in culture." Biochem.Biophys.Res.Commun.248. 436-440 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 柳瀬幹雄: "Involvement of small GTPase Rho in contraction of liver stellate cells." Hepatology. 28. 411A (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 松井 淳: "肝類洞壁細胞研究の進歩 第7巻、谷川久一編、国際医書出版" 肝類洞壁細胞に発現する新しいプロテインキナーゼのクローニング, 93-96 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ogata I,et al. :"Rat liver fat-storing cell lines express sarcomeric myosin heavy chain mRNA and protein." Cell Mot Cytoskeleton. 26. 125-132 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ogata I,et al. :"Cloning and characterization of a new member of the protein-kinase family from a rat fat-string cell cDNA library." Hepatology. 18. 169A (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ogata I,et al. :"Up-regulation of type I procollagen C-proteinase enhancer protein messenger RNA in rats with CCl_4-induced liver fibrosis." Hepatology. 26. 611-617 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ikeda H,et al. :"Effect of lysophosphatidic acid on proliferation of stellate cells and hepatocytes in culture." 248. 436-440 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yanase M,et al. :"Involvement of small GTPase Rho in contraction of liver stellate cells." Hepatology. 28. 411A (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Matsui A,et al. :"Cloning and characterization of a new member of the protein-kinase family from a rat fat0string cell cDNA lubrary : its expression by hepatic non-parenchymal cells. (in Japanese)" Progress in Hepatic Sinusoidal Cell Studies. Vol.7.Kokusai Isho Shuppan Ltd.Medical Publishers. 93-96 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 尾形 逸郎: "Up-regulation of type I procellagon C-proteinase enhancerprotein mossenger RNA in rats with CCl_4-induced liver fibrosis" Hepatology. 26. 611-617 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 池田 均: "Effect of lysophosphatidic acid on proliferation of stellate cells and hepatocytes in culture." Biochem.Biophys.Res.Commun.248. 436-440 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 柳瀬 幹雄: "Involvement of small GTPase Rho in contraction of liver stellate cells." Hepatology. 28. 411A (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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