Polyethylene glycol-superoxide dismutase inhibits lipid peroxidation in hepatic ischemia/reperfusion injury

Wyn D. Nguyen, Donald H. Kim, Hasan B. Alam, Haydee S. Provido, John R. Kirkpatrick*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Background: Hepatic injury after ischemia/reperfusion is attributed to the development of oxygen free radical (OFR)-mediated lipid peroxidation - a process that can be measured through its byproducts, specifically malondialdehyde. The use of free radical scavengers can offer significant protection against OFR-induced liver injury. We hypothesize that a new potent OFR scavenger, polyethylene glycol-superoxide dismutase (PEG-SOD), can inhibit OFR-mediated lipid peroxidation in hepatic ischemia/reperfusion injury. Methods: Twelve male Sprague-Dawley rats (300-350 g) were subjected to occlusion of the left and middle hepatic arteries and portal veins for 90 min, followed by 120 min reperfusion. PEG-SOD (5000 units/kg) was given intravenously before vascular occlusion and again immediately upon reperfusion to six rats. Normal saline was given to the remaining six rats to be used as a control group. The right hepatic lobe (used as internal control) and left hepatic lobe were harvested separately and tissue malondialdehyde was measured. Results: A marked increase in lipid peroxide was found in the normal saline group after 2 h reperfusion. Treatment with PEG-SOD prevented the rise in tissue malondialdehyde. The mean difference in the malondialdehyde between the left and right hepatic lobes were 13.20 ± 6.35 and 1.70 ± 3.65 nmol/g in the normal saline (control) and PEG-SOD groups, respectively. This difference was found to be statistically significant (P<0.005) using Student's t-test. Conclusions: PEG-SOD can effectively attenuate hepatic ischemia/reperfusion injury by inhibiting OFR-mediated lipid peroxidation.

Original languageEnglish (US)
Pages (from-to)127-130
Number of pages4
JournalCritical Care
Issue number5
StatePublished - 1999
Externally publishedYes


  • Ischemia
  • Lipid peroxidation
  • Liver
  • Oxygen free radicals
  • Reperfusion injury

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine


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