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Does DNA fragmentation in myocytes in infarct area really mean apoptosis?

Research Project

Project/Area Number 09670708
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Circulatory organs internal medicine
Research InstitutionGifu University

Principal Investigator

TAKEMURA Genzou  Gifu University, Medicine, Assistant Professor, 医学部・附属病院, 助手 (40283311)

Co-Investigator(Kenkyū-buntansha) FUJIWARA Hisayoshi  Gifu University, Medicine, Professor, 医学部, 教授 (80115930)
NODA Toshiyuki  Gifu University, Medicine, Associate Professor, 医学部・附属病院, 講師 (00262759)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1998: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordsapoptosis / DNA fragmentation / ultrastructure / cardiac myocyte / ischemia / reperfusion / myocardial infarction / DNAfragmentation / 虚血・再潅流
Research Abstract

Thirty rabbits were divided into 5 groups (n=6 each) that were subjected to a sham operation or to 30-minute ischemia followed by 0-minute, 30-minute, 2-hour, or 4-hour reperfusion of a coronary artery. In the 2- and 4-hour reperfusion groups only, DNA electrophoresis showed a ladder pattern, and a light microscopic TUNEL finding was positive in the nuclei of myocytes localized in the infarcted area (6"+"2% and 11"+"3%, respectively). Electron microscopic TUNEL showed that nuclei with a significant accumulation of immunogold particles (indicating an electron microscopic TUNEL-positive result) were observed only in the infarcted myocytes with irreversibly oncotic ultrastructures that were found in the hearts of the 2- and 4-hour reperfusion groups (41 3% and 83 4%, respectively). Irreversibly oncotic myocytes (indicated by swelling, inhomogeneously clumped chromatin in nuclei, dense bodies in mitochondria, and/or ruptured plasma membranes) were also seen in the 0- and 30-minute reperfusion groups, which did not exhibit TUNEL-positive myocytes. There was no evidence of apoptotic ultrastructures in the myocytes.
DNA fragmentation occurs in the myocytes that had already shown irreversibly oncotic, but not apoptotic, ultrastructures with ischemia and/or reperfusion. Therefore, DNA fragmentation itself does not always mean apoptosis, and so-called apoptotic infarcted myocytes may belong to a category of cell death other than apoptosis.

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] 竹村元三、他: "虚血性心疾患とアポトーシス" 臨床病理. 45(7). 606-613 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 大野道也、他: "梗塞心筋細胞のDNA断片化はいわゆる“アポトーシス心筋細胞"を意味するかー電子顕微鏡レベルでのTUNEL法による検討ー" 第2回心・血管とアポトーシス研究会報告集. 38-43 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takemura G,et al: "Role of apoptosis in the disapearance of infiltrated and proliferated interstitial cells after myocardial infarction" Circ Res. 82(11). 1130-1138 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ohno M,et al.: "“Apoptotic myocytes" in infact area in rabbit hearts may be oncotic myocytes with DNA fiagmentation : Analysis by immunogold electron microscopy combined with in situ nick endlabeing" Circulation. 98(14). 1422-1430 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hayakawa Y,at al.: "Apoptosis and overexpression of Bax protein and bax mRNA in smooth muscle cells within・intimal hyperplasia of human radial arteries-Analysis using arteriovenous fistulas for hemodalysis-" Arteriosclerosis Thrombosis Vascular Biology. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kano M,et al: "Of the significance of myocytes with positive DNA in situ Nick End Labeing (TUNEL) in hearts with dilated cardiomyopathy : Not apoptosis but DNA repair" Circulation. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ohno M,et al.: ""Apoptotic" Myocytes in Infarct Area in Rabbit Hearts May Be Oncotic Myocytes With DAN Fragmentation. Analysis by Immunogold Electron Microscopy Combined With In Situ Nick End-Labeling" Circulation. 96 (14). 1422-1430 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takemura G,et al.: "Role of Apoptosis in the Disappearance of Infiltrated and Proliferated Interstitial Cells After Myocardial Infarction" Cirulation Research. 82 (11). 1130-1138 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hayakawa Y,et al.: "Apoptosis and overexpression of Bax protein and bax mRNA in smooth muscle cells within intimal hyperplasia of human radial arteries-Analysis using arterivenous fistulas for hemodialysis" Arteriosler Thromb Vasc Biol. (In Press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kanoh M,et al.: "Of Significance of the Myocytes With Positive DNA In Situ Nick End Labeling (TUNEL) in Hearts With Dilated Cardiomyopathy : Not Apoptosis but DNA Repair" Circulation. (In Press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takemura G,et al.: "Role of apoptosis in the disappearance of infiltrated and proliferated interstitial cells after myocardial infarction" Circ Res,. 82(11). 1130-1138 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Ohno M,et al.: "“Apoptotic myocytes" in infact area in rabbit hearts may be oncotic myocytes with DNA fragmentation Analysis by immunogold electron microscopy combined with in situ nick endlabeling" Circulation. 98(3). 1422-1430 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Hayakawa Y,et al.: "Apoptosis and overexpression of Bax protein and bax mRNA in smooth muscle cells within intimal hyperplasia of human radial arteries-Analysis using arteriovenous fistulas for hemodalysis" Arteriosclerosis Thrombosis Vascular Biology. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kano M,et al: "Of the significance of myocytes with positive DNA in situ Nick End Labeling (TUNEL) in hearts with dilated cardiomyopathy : Not apoptosis but DNA repair" Circulation. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Takemura G et al.: "Role of apoptosis in the disappearance of infiltrated and proliferated interstitial cells after myocardial infarction." Circulation Research. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report

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

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