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Analyses of ischemia-induced signals in cardiac myocytes

Research Project

Project/Area Number 11470159
Research Category

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

Allocation TypeSingle-year Grants
Section一般
Research Field Circulatory organs internal medicine
Research InstitutionUniversity of Tokyo

Principal Investigator

TAKAHASHI Toshiyuki  Faculty of Medicine, University of Tokyo, Assistant, 医学部・附属病院, 助手 (40236302)

Co-Investigator(Kenkyū-buntansha) YAO Atsushi  Faculty of Medicine, University of Tokyo, Medical staff, 医学部・附属病院, 医員
HARADA Kazumasa  Faculty of Medicine, University of Tokyo, Medical staff, 医学部・附属病院, 医員
MATSUI Hiroshi  Faculty of Medicine, University of Tokyo, Assistant, 医学部・附属病院, 助手 (30282669)
SHIMIZU Tatsuya  Faculty of Medicine, University of Tokyo, Medical staff, 医学部・附属病院, 医員
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2000: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1999: ¥4,400,000 (Direct Cost: ¥4,400,000)
Keywordsmyocardial ischemia-reperfusion / hypoxia-inducible factor 1α / vascular endothelial growth factor / inducible nitric oxide synthase / lipopolysaccharide / adenosine / chick embryo / cardiac myocytes / RT-PCR法 / RACE法 / endothelial PAS protein 1 / cDNA クローニング / 誘導型一酸化窒素合成酵素 / hypoxia-inducible factor
Research Abstract

The objective of this project was to elucidate functional significance of hypoxia-inducible factor 1α (HIF-1α), a member of the basic-helix-loop-helix-Per/ARNT/Sim (bHLH-PAS) protein family, in the ischemic-reperfused myocardium. Particularly, we analyzed expression of vascular endothelial growth factor (VEGF) and inducible nitric oxide synthase (iNOS), which are among target genes of HIF-1α, in cardiac myocytes.
1) Analyses of VEGF expression in cardiac myocytes : Using cultured neonatal rat myocytes, we have observed that expression of VEGF was augmented by lipopolysaccaharide (LPS) (Sugishita Y, et al. Biochem Biophys Res Commun, 2000) or adenosine (via its A_2 receptor). On the other hand, we have analyzed expression of the chick VEGF in cultured 10-day-old chick embryonic ventricular myocytes (CEVM) (Sugishita Y, et al. J Mol Cell Caardiol, 2000).
2) Analyses of the chick iNOS gene expression in CEVM : We have obtained the data showing that both NF-κB and Ets-1 are involved in the LPS-induced transactivation of the chick iNOS geen in CEVM (Takahashi T, et al. Mol Cell Biochem, submitted).
3) Molecular cloning and expressional analyses of the chick HIF-1α cDNA in CEVM : We have cloned cDNAs encoding the chick HIF-1α from CEVM with RT-PCR and Race methods. We then examined expression of the chick HIF-1α mRNA species in various embryonic tissues. The deduced amino acid sequence of the chick HIF-1α cDNA showed 79% identity with that of the human HIF-1α cDNA.In contrast, sequence homology between the chick HIF-1α and endothelial PAS protein 1 (EPAS1), another member of the bHLH-PAS proteins, was only low (49%). HIF-1α mRNA was expressed abundantly in CEVM, but scarcely in the liver, which was quite different from expression pattem of EPAS1 mRNA.These data suggest that HIF-1α may be involved in embryonic cardiovascular development (Takahashi T, et al. Biochem Biophys Res Commun, 2001, in press).

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Sugishita Y,Shimizu T,Takahashi T, et al.: "Lipopolysaccharide augments expression and secretion of vascular endothelial growth factor in rat ventricualr myocytes"Biochem Biophys Res Commun. 268. 657-662 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Sugishita Y,Takahashi T,Shimizu T, et al.: "Expression of genes encoding vascular endothelial growth factor and its Flk-1 receptor in the chick embryonic heart."J Mol Cell Cardiol. 32. 1039-1051 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Takahashi T,Sugishita Y,Nojiri T, et al.: "Cloning of hypoxia-inducible factor 1α cDNA from chick exbryonic ventricular myocytes."Biochem Biophys Res Commun. (印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Sugishita Y, Shimizu T, Takahashi T, et al.: "Lipopolysaccharide augments expression and secretion of vascular endothelial growth factor in rat ventricular myocytes."Biochem Biophys Res Commun. 268. 657-662 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Sugishita Y, Takahashi T, Shimizu T, et al.: "Expression of genes encoding vascular endothelial growth factor and its FIK-1 receptor in the chick embryonic heart."J Mol Cell Cardiol. 32. 1039-1051 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Takahashi T, Sugishita Y, Nojiri T, et al.: "Cloning of hypoxia-inducible factor 1α cDNA from chick embryonic ventricular myocytes."Biochem Biophys Res Commun. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Sugishita Y,Takahashi T,Shimizu T, et al.: "Expression of genes encoding vascular endothelial growth factor and its Flk-1 receptor in the chick embryonic heart."J Mol Cell Cardiol. 32. 1039-1051 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Takahashi T,Sugishita Y,Nojiri T, et al.: "Cloning of hypoxia-inducible factor 1α cDNA from chick embryonic ventricular myocytes."Biochem Biophys Res Commun. (印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Sugishita Y,Shimizu T,Takahashi T,et al.: "Lipopolysaccharide augments expression and secretion of vascular endothelial growth factor in rat ventricualr myocytes"Biochem Biophys Res Commun. 268. 657-662 (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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