The role of oxygen-derived free radicals in ischemia-induced increases in canine skeletal muscle vascular permeability

Circulation Research
R J KorthuisA E Taylor

Abstract

Previous studies indicate that vascular permeability is increased in skeletal muscle subjected to 4 hours of inflow occlusion. However, the mechanism(s) underlying the increase in permeability are unknown. The aim of this study was to assess the role of oxygen-derived free radicals and histamine as putative mediators of the increased permeability in skeletal muscle subjected to 4 hours of inflow occlusion. The osmotic reflection coefficient for total plasma proteins and isogravimetric capillary pressure were estimated in canine gracilis muscle for the following conditions: control, ischemia, and ischemia plus pretreatment with allopurinol (a xanthine oxidase inhibitor), catalase (a peroxidase that reduces hydrogen peroxide to water and molecular oxygen), superoxide dismutase (a superoxide anion scavenger), dimethyl sulfoxide (a hydroxyl radical scavenger), diphenhydramine (a histamine H1-receptor blocker), or cimetidine (a histamine H2-receptor blocker). Ischemia, followed by reperfusion, significantly reduced the reflection coefficient from 0.94 +/- 0.02 to 0.64 +/- 0.02 and isogravimetric capillary pressure from 13.8 +/- 1.0 mm Hg to 6.9 +/- 0.4 mmHg, indicating a dramatic increase in microvascular permeability. Prior treatme...Continue Reading

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