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PhD Dexter, PhD Ward, F. MAOxon, MRCPath Daniel, Frcp Lees, DSc Peters, DSc Jenner, Frs Marsden, P. Jenner (1992)
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We examine the evidence for free radical involvement and oxidative stress in the pathological process underlying Parkinson's disease, from postmortem brain tissue. The concept of free radical involvement is supported by enhanced basal lipid peroxidation in substantia nigra in patients with Parkinson's disease, demonstrated by increased levels of malondialdehyde and lipid hydroperoxides. The activity of many of the protective mechanisms against oxidative stress does not seem to be significantly altered in the nigra in Parkinson's disease. Thus, activities of catalase and glutathione peroxidase are more or less unchanged, as are concentrations of vitamin C and vitamin E. The activity of mitochondrial superoxide dismutase and the levels of the antioxidant ion zinc are, however, increased, which may reflect oxidative stress in substantia nigra. Levels of reduced glutathione are decreased in nigra in Parkinson's disease; this decrease does not occur in other brain areas or in other neurodegenerative illnesses affecting this brain region (i.e., multiple system atrophy, progressive supranuclear palsy). Altered glutathione metabolism may prevent inactivation of hydrogen peroxide and enhance formation of toxic hydroxyl radicals. In brain material from patients with incidental Lewy body disease (presymptomatic Parkinson's disease), there is no evidence for alterations in iron metabolism and no significant change in mitochondrial complex I function. The levels of reduced glutathione in substantia nigra, however, are reduced to the same extent as in advanced Parkinson's disease. These data suggest that changes in glutathione function are an early component of the pathological process of Parkinson's disease. The data presented suggest (1) there is oxidative stress in the substantia nigra at the time of death in advanced Parkinson's disease that manifests in terms of increased lipid peroxidation, superoxide dismutase activity, and zinc levels; (2) there is a major impairment of the glutathione pathway in Parkinson's disease; and (3) alterations in reduced glutathione levels may occur very early in the illness.
Annals of Neurology – Wiley
Published: Jan 1, 1992
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