International Journal of Health Sciences and Research

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Original Research Article

Year: 2019 | Month: April | Volume: 9 | Issue: 4 | Pages: 178-186

Antioxidant Capacity is Decreased in Alzheimer’s Disease and Mild Cognitive Impairment Patients

Mayara Chaves Faria1, Gisele Santos Gonçalves2, Rita Carolina Figueiredo Duarte2, Maria Aparecida Bicalho3, Luiz Felipe José Ravic de Miranda4, Karina Braga Gomes Borges5, Lirlândia Pires Sousa5,
Maria das Graças Carvalho6

1MSc Student, 2Ph.D Student, 5Associate Professor, Ph.D, 6Full Professor, Ph.D,
Department of Clinical and Toxicological Analysis, Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
3Associate Professor, Ph.D MD, 4Assistant Professor, Ph.D MD,
Department of Medical Clinic, Faculty of Medicine, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

Corresponding Author: Maria das Graças Carvalho


We investigated through measurements in serum, the occurrence of oxidative stress in patients with Alzheimer’s disease (AD), mild cognitive impairment (MCI) and healthy elderly controls. Possible correlations between a genetic risk factor for AD, the allele ε4 of the apolipoprotein E (APOE) gene, and oxidative stress were also investigated. Through Thiobarbituric Acid Reactive Substances (TBARS) assay serum lipid peroxidation products of AD patients, MCI patients and controls were measured. We also analyzed the participants’ serum antioxidant status through 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) dye reduction. No difference between the groups was observed concerning TBARS levels (p = 0.212). Controls had a higher antioxidant status compared to AD (controls: 0.43 ± 0.061 O.D; AD: 0.39 ± 0.065 O.D), p = 0.002, and MCI patients (0.381 ± 0.065 O.D), p = 0.001. No difference concerning antioxidant status or TBARS levels was associated with the ε4 APOE allele. Oxidative stress in MCI and AD patients seems to be evidenced in serum by a reduction of the antioxidant system capacity rather than change in the TBARS levels. MTT assay for evaluation of antioxidant status could be helpful in therapeutic intervention and guide changes in the life-style of individuals in early stages of cognition impairment.

Key words: Alzheimer’s disease; Biochemical markers; Aging; Dementia; Molecular markers.

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