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We have studied the response to toxic oxygen metabolites of fibroblasts derived from skin biopsies of 5 patients with familial (FAD) and 4 with sporadic (AD) Alzheimer's disease compared with those derived from 4 normal controls. Fibroblasts were damaged by the generation of oxygen metabolites during the enzymatic oxidation of acetaldehyde by 50 munits of xanthine-oxidase (Xo). To quantify cell damage we measured lactate dehydrogenase (LDH) activity in the culture medium and cell viability in fibroblast cultures. We found a significant increase in LDH activity in the FAD vs. controls and also in the AD vs. controls.
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