Brain superoxide dismutase, catalase, and glutathione peroxidase activities in amyotrophic lateral sclerosis

Annals of Neurology
S PrzedborskiA P Hays

Abstract

Amyotrophic lateral sclerosis is a fatal paralytic disorder of unknown cause. Recent evidence implicated the role of free radicals in the death of motor neurons in this disease. To investigate this hypothesis further, we measured the activity of the main free radical scavenging enzymes copper/zinc superoxide dismutase, manganese superoxide dismutase, catalase, and glutathione peroxidase in postmortem brain samples from 9 patients with sporadic amyotrophic lateral sclerosis and from 9 control subjects. We examined samples from the precentral gyrus of the cerebral cortex, a region affected in amyotrophic lateral sclerosis, and from the cerebellar cortex, a region not affected. The two groups did not differ in age or postmortem delay. In the precentral gyrus from amyotrophic lateral sclerosis samples, glutathione peroxidase activity as measured by spectrophotometric assay (13.8 +/- 2.6 nmol/min/mg protein [mean +/- standard error of mean]) was reduced significantly compared to the activity in the precentral gyrus from control samples (22.7 +/- 0.5 nmol/min/mg protein). In contrast, glutathione peroxidase activity was not significantly altered in the cerebellar cortex from amyotrophic lateral sclerosis patients compared to controls...Continue Reading

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