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Croat Med J. 2002 Feb;43(1):28-32.

Malondialdehyde, superoxide dismutase, melatonin, iron, copper, and zinc blood concentrations in patients with Alzheimer disease: cross-sectional study.

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1
Department of Psychiatry, University of Suleyman Daniel School of Medicine, Isparta, Turkey,

Abstract

AIM:

To investigate the oxidative stress hypothesis in patients with Alzheimer type dementia.

METHOD:

Serum melatonin, Zn, Cu, Fe, and malondialdehyde (MDA) concentrations and erythrocyte superoxide dismutase (SOD) activity were measured in patients with Alzheimer disease. Mini-Mental State Examination (MMSE) scores were obtained for the patients and their age- and sex-matched healthy controls.

RESULTS:

MMSE score was 16.81.3 in patients with Alzheimer disease, and 28.22.4 in control group. Melatonin levels were lower in the Alzheimer disease group (170.55.2 pg/mL) than in the control group (205.25.8 pg/mL) (p<0.001). Fe, SOD, and MDA levels were higher in Alzheimer disease group (131.74.8 microg/dL, 1,51090 U/g Hb, and 38.14.7 nmol/mL; respectively) than in the control group (97.14.1 microg/dL, 1,12050 U/g Hb, and 17.21.6 nmol/mL; respectively) (p<0.001 for all comparisons). A statistically significant negative correlation between melatonin and SOD (r=-0.421, p=0.014) and a positive correlation between age and Fe (r=0.325, p=0.049) were found only in the Alzheimer disease group. Correlation between age and melatonin was positive (r=0.481, p=0.006) in Alzheimer disease group and negative (r=-0.472, p=0.009) in the control group.

CONCLUSION:

Melatonin blood concentration was significantly decreased, and Fe and MDA levels were increased in the patients with Alzheimer disease. We believe that low level of melatonin, especially if there is a simultaneous increase in Fe level, is associated with the development of Alzheimer disease.

PMID:
11828555
[Indexed for MEDLINE]
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