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Department of Neurology, School of Medicine, University of Colorado Health Sciences Center, Denver 80262.
We assayed cytochrome oxidase and other electron transport chain activities in platelet mitochondria isolated from patients with Alzheimer's disease (AD). Five of 6 patients had striking reductions of platelet cytochrome oxidase activity (patient mean, 83.72 +/- 82.99 nmol/min/mg; control mean, 167.14 +/- 36.21 nmol/min/mg; n = 8). Other electron transport chain catalytic activities were not significantly different than control values. AD may be a systemic illness, a primary defect in cytochrome oxidase may be pathogenically important in its production, and the mitochondrial genes encoding cytochrome oxidase subunits may be important in producing the defect.
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