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  • Title: Polyethylene glycol-conjugated superoxide dismutase and catalase reduce ischemic brain injury.
    Author: Liu TH, Beckman JS, Freeman BA, Hogan EL, Hsu CY.
    Journal: Am J Physiol; 1989 Feb; 256(2 Pt 2):H589-93. PubMed ID: 2492771.
    Abstract:
    Superoxide dismutase and catalase enzymatically scavenge superoxide and hydrogen peroxide, respectively. Conjugation of polyethylene glycol to superoxide dismutase (PEG-SOD) or catalase (PEG-CAT) prolongs the circulatory half-life of the native enzymes and enhances their intracellular access. We studied the protective effect of these free radical scavengers on ischemic brain injury using a rat model of focal cerebral ischemia, which is suitable for therapeutic trials. Intravenous administration of PEG-SOD (10,000 U/kg) and PEG-CAT (10,000 U/kg) before ischemia reduced the infarct volume (treatment, 139 +/- 9 mm3, means +/- SE, N = 38; placebo, 182 +/- 8 mm3, n = 37, P less than 0.002). This finding supports the concept that superoxide and hydrogen peroxide contribute to brain injury following focal cerebral ischemia.
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