Abstract
Recent evidence suggests that free oxygen radicals are produced by ischaemic tissues, accounting for at least part of the damage that results. These free oxygen radicals are produced by xanthine oxidase, amongst others, and removed by scavenger enzymes (catalase, superoxide dismutase and glutathione peroxidase) and anti-oxidants. As mitochondria are oxygen-utilising organelles, they are capable of producing free oxygen radicals. Our results indicate that the removal of free oxygen radicals are not diminished during ischaemia, but the activity of the free oxygen radical generator, xanthine oxidase, is increased. This could lead to an increased superoxide anion concentration.
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