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Age Ageing. 2001 May;30(3):235-41.

Antioxidant defences and oxidative stress markers in erythrocytes and plasma from normally nourished elderly Alzheimer patients.

Author information

1
Centre de Gériatrie Henri Choussat, Hôpital Xavier Arnozan, 33604 Pessac cedex, France. isabelle.bourdel-marchasson@chu-bordeaux.fr

Abstract

OBJECTIVES:

to investigate blood markers of oxidative stress, and enzymatic and non-enzymatic antioxidants in normally nourished elderly people with Alzheimer's disease.

DESIGN:

case-control study.

SUBJECTS:

twenty patients with Alzheimer's disease and 23 elderly control subjects, living at home, free from disease and not undergoing any treatment known to have a strong influence on blood oxidative stress markers or antioxidant defence systems.

METHODS:

we performed a nutritional evaluation, including anthropometric and biological measures and a 3-day dietary record. We determined concentrations of antioxidant vitamins (alpha-tocopherol, retinol) and malondialdehyde in plasma and erythrocytes. We also measured erythrocyte enzymatic activities of glutathione peroxidase and copper-zinc superoxide dismutase.

RESULTS:

the two groups were similar in age, body mass index, dietary record and serum albumin concentration. After adjustment for age, sex and cardiovascular co-morbidity, mean plasma concentration of alpha-tocopherol was lower in those with Alzheimer disease than in control subjects (15+/-3.5 mg/l compared with 18.2+/-3.5; P=0.002), as was the mean plasma concentration of retinol (0.54+/-0.2 mg/l vs 0.7+/-0.2; P=0.014). The mean concentration of free plasma malondialdehyde was higher in those with Alzheimer's disease (0.70+/-0.2 mmol/l vs 0.5+/-0.1; P=0.036). In Alzheimer disease patients, free plasma malondialdehyde concentrations were inversely correlated with levels of alpha-tocopherol (P=0.002) and retinol (P=0.025). Erythrocyte levels of vitamins and enzymatic activities were similar in the two groups.

CONCLUSION:

lower plasma concentrations of alpha-tocopherol and retinol in normally nourished elderly patients with Alzheimer's disease than in controls could suggest that these antioxidant vitamins had been consumed as a result of excessive production of free radicals.

PMID:
11443025
DOI:
10.1093/ageing/30.3.235
[Indexed for MEDLINE]

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