Erythrocyte Glutathione Peroxidase
Free radicals remain an integral component of numerous physiological and pathophysiological activities within cellular systems. Free radicals result from electronic excitations leading to the creation of unevenly paired electrons which react with biomolecules in three primary stages: initiation, propagation, and termination. In initiation, free radicals are produced through high-energy radiation, hemolytic cleavage, or the addition of excited electrons. Through propagation, free radicals produce additional free radicals through a process reminiscent of nuclear chain reactions. In the termination step, the propagation of free radicals may be eliminated when free radical species react with one another or are scavenged by antioxidant molecules. In biological systems, reactive oxygen species (ROS), such as •OH and O2•- are the most prominent free radical species produced from environmental exposure or cellular...
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