Postischemic recovery of contractile function is impaired in SOD2+/- but not SOD1+/- mouse hearts

Gregory K. Asimakis, Scott D Lick, Cam Patterson

Research output: Contribution to journalArticle

102 Citations (Scopus)

Abstract

Background - Reactive oxygen species (ROS) contribute to myocardial stunning. Superoxide dismutase (SOD) is a major defense mechanism against ROS. The purpose of this study was to evaluate the contributions of cytosolic (SOD1) and mitochondrial (SOD2) isoforms to protect against myocardial stunning. Methods and Results - Isolated hearts from wild-type, heterozygous (+/-) SOD1 and SOD2 knockout mice received 30 minutes of ischemia followed by 60 minutes of reperfusion. After 60 minutes of reperfusion, the heart rate multiplied by the developed pressure (HR×DP) in the wild-type and SOD1+/- hearts recovered to 92±9 and 85±7 of preischemic baseline values, respectively (P=NS). In contrast, the HR×DP was significantly lower (63±7%) in the SOD2+/- hearts compared with the wild-type hearts. Western blot analysis and enzymatic activity of tissue lysates confirmed reduction of activities of specific SOD isoforms without compensatory increase in the other isoform in the knockout animals studied. Conclusions - Postischemic functional recovery is more sensitive to a partial deficiency of SOD2 than a partial deficiency of SOD1. Therefore, modulation of the mitochondrial SOD isoform is a critical determinant in the tolerance of the heart to oxidative stress.

Original languageEnglish (US)
Pages (from-to)981-986
Number of pages6
JournalCirculation
Volume105
Issue number8
DOIs
StatePublished - Feb 26 2002
Externally publishedYes

Fingerprint

Recovery of Function
Protein Isoforms
Myocardial Stunning
Superoxide Dismutase
Reperfusion
Reactive Oxygen Species
Heart Rate
Pressure
Knockout Mice
Oxidative Stress
Ischemia
Western Blotting

Keywords

  • Free radicals
  • Ischemia
  • Reperfusion
  • Stunning, myocardial

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Postischemic recovery of contractile function is impaired in SOD2+/- but not SOD1+/- mouse hearts. / Asimakis, Gregory K.; Lick, Scott D; Patterson, Cam.

In: Circulation, Vol. 105, No. 8, 26.02.2002, p. 981-986.

Research output: Contribution to journalArticle

Asimakis, Gregory K. ; Lick, Scott D ; Patterson, Cam. / Postischemic recovery of contractile function is impaired in SOD2+/- but not SOD1+/- mouse hearts. In: Circulation. 2002 ; Vol. 105, No. 8. pp. 981-986.
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N2 - Background - Reactive oxygen species (ROS) contribute to myocardial stunning. Superoxide dismutase (SOD) is a major defense mechanism against ROS. The purpose of this study was to evaluate the contributions of cytosolic (SOD1) and mitochondrial (SOD2) isoforms to protect against myocardial stunning. Methods and Results - Isolated hearts from wild-type, heterozygous (+/-) SOD1 and SOD2 knockout mice received 30 minutes of ischemia followed by 60 minutes of reperfusion. After 60 minutes of reperfusion, the heart rate multiplied by the developed pressure (HR×DP) in the wild-type and SOD1+/- hearts recovered to 92±9 and 85±7 of preischemic baseline values, respectively (P=NS). In contrast, the HR×DP was significantly lower (63±7%) in the SOD2+/- hearts compared with the wild-type hearts. Western blot analysis and enzymatic activity of tissue lysates confirmed reduction of activities of specific SOD isoforms without compensatory increase in the other isoform in the knockout animals studied. Conclusions - Postischemic functional recovery is more sensitive to a partial deficiency of SOD2 than a partial deficiency of SOD1. Therefore, modulation of the mitochondrial SOD isoform is a critical determinant in the tolerance of the heart to oxidative stress.

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