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Peripheral markers of oxidative stress in probable Alzheimer patients.

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By Repetto MG, Reides CG, Evelson P, Kohan S, de Lust • • July 1, 1999

BACKGROUND: The current research on Alzheimer's disease is mainly focused in the post-mortem characterization of pathological and biochemical alterations in the brain. The finding of peripheral markers that could be associated with the changes observed in the Alzheimer's brain would be of interest in this field. The aim of the present study was to evaluate the state of different peripheral markers of oxidative stress in probable Alzheimer patients and compare them with a group of healthy individuals.

DESIGN: The determinations made include the plasma total antioxidant capacity (TRAP) and tert-butyl hydroperoxide-initiated chemiluminescence and catalase activity in erythrocytes from 18 patients with probable Alzheimer's disease and 18 matched control subjects with normal cognitive function.

RESULTS: TRAP was decreased in Alzheimer patients by 24% (control group 308 micromol L-1 Trolox, SEM 34, n = 18). tert-Butyl hydroperoxide-initiated chemiluminescence and catalase activity showed an increase in erythrocytes from Alzheimer patients by 52% (control group 116 700 cps mg-1 haemoglobin, SEM 6690) and 75% (control group 2.55 pmol mg-1 protein, SEM 0.39, n = 18) respectively.

CONCLUSION: Oxidative stress in the blood of probable Alzheimer patients could be a reflection of the brain condition and suggests that oxygen free radicals could be partially responsible of the damage observed in this disease.

Source: Eur J Clin Invest 1999 Jul;29(7):643-9
PMID: 10411672, UI: 99340426

(Catedra de Quimica General e Inorganica, Facultad de Farmacia y Bioquimica, Universidad de Buenos Aires, Argentina.

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