in the process of oligodendrocyte destruction and demyelination in MS lesions iron is liberated from its intracellular ferritin bound stores into the extracellular space, where it is taken up by microglia and macrophages and again stored together with ferritin. When this happens in MS lesions in an environment, where free radicals are produced by oxidative burst, iron can be liberated from ferritin and transformed into reactive Fe++[114], which reacts with hydrogen peroxide to generate highly reactive hydroxyl radicals [36] and thus amplifies oxidative damage and associated cellular injury
Nathan Goodyear on 29 Oct 12Fantastic review of oxidative damage and the CNS. This is a 2006 review of our understanding of how neurodegeneration occurs through oxidative stress and of course poor detoxification.