Ischemia-Induced Norepinephrine Release, but not Norepinephrine-Derived Free Radicals, Contributes to Myocardial Ischemia-Reperfusion Injury

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Author(s)

    • NONOMURA Makoto
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • NOZAWA Takashi
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • MATSUKI Akira
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • NAKADATE Teruo
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • IGARASHI Norio
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • KATO Bun-ichi
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • FUJII Nozomu
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • IGAWA Akihiko
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • ASANOI Hidetsugu
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University
    • KONDO Takashi
    • Department of Radiological Sciences, Toyama Medical and Pharmaceutical University
    • INOUE Hiroshi
    • The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University

Abstract

<b>Background</b> Norepinephrine (NE)-derived free radicals may contribute to myocyte injury after ischemia -reperfusion, so the influence of sympathetic denervation on myocardial ischemia - reperfusion injury was investigated in the present study. <b>Methods and Results</b> Cardiac sympathetic denervation was produced in Wistar rats by a solution of 10% phenol 1 week before ischemia. Atenolol (0.5 mg/kg) was intravenously administered 10 min before the coronary occlusion. The left coronary artery was occluded for 30 min and thereafter reperfused. Cardiac interstitial fluid was collected by a microdialysis probe and free radicals in dialysate were determined by electron paramagnetic resonance (EPR) spin trapping, using 5,5-dimethyl-1-pyrroline-N-oxide as a spin trap. The ratio of infarct size to the ischemic area at risk (I/R) was decreased in both the phenol and atenolol groups compared with control (28.5±11.3, 31.8±10.7 vs 50.6±14.7%, p<0.05). During the coronary occlusion, concentrations of interstitial NE increased markedly in the control and atenolol groups, but was unchanged in the phenol group. EPR signal intensity (relative value to internal standard) was maximal at 1 h after reperfusion and was similar in the phenol and control groups (0.32±0.15 vs 0.45±0.19). <b>Conclusions</b> Cardiac denervation protected myocyte against ischemia - reperfusion injury through decreasing direct NE toxicity, but not through decreasing NE-derived free radicals. (<i>Circ J</i> 2005; <b>69:</b> 590 - 595)<br>

Journal

  • Circulation Journal

    Circulation Journal 69(5), 590-595, 2005-04-20

    Japanese Circulation Society

References:  46

Cited by:  5

Codes

  • NII Article ID (NAID)
    110002696145
  • NII NACSIS-CAT ID (NCID)
    AA11591968
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    13469843
  • Data Source
    CJP  CJPref  NII-ELS  J-STAGE 
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