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Oxidative Damage and Progression to Alzheimer's Disease in Patients with Mild Cognitive Impairment – Source: Journal of Alzheimers Disease, Aug 6, 2010

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By I Baldeiras, et al. • www.ProHealth.com • August 18, 2010


Recent studies show that most of the oxidative changes [free radical damage to all cellular components] found in Alzheimer's disease (AD) are already present in mild cognitive impairment (MCI) patients.

The question arises as to whether oxidative stress has a role in the progression of MCI to AD.

We conducted a longitudinal study [tracked over time] on 70 MCI patients, and the peripheral blood levels of a broad spectrum of non-enzymatic and enzymatic antioxidant defenses, as well as lipid and protein oxidation markers, and nitrogen oxidative species were determined.

At baseline, there were no differences in any of the indexes of oxidative damage between stable MCI patients (MCI-MCI) and patients that progressed to AD (MCI-AD).

Cellular levels of lipid peroxidation markers increased in both groups and this was accompained in MCI-AD, but not in MCI-MCI patients, by a significant decrease in cellular antioxidant defenses (oxidyzed/reduced glutathione ratio and vitamin E). [Note: Vitamin E is actually a family of fat-soluble vitamins called tocopherols/tocotrienols that are active throughout the body and work with other nutrients including vitamin C, glutathione, selenium and vitamin B-3 to keep oxygen molecules from becoming too reactive/destructive.]

Among MCI-AD patients, the longitudinal decrease in cellular vitamin E was associated with the deterioration in cognitive performance.

These results suggest:

• That accumulation of oxidative damage may start in pre-symptomatic phases of AD pathology.

• And that progression to AD might be related to depletion of antioxidant defenses.

Source: Journal of Alzheimers Disease, Aug 6, 2010. PMID: 20693652, by Baldeiras I, Santana I, Proença MT, Garrucho MH, Pascoal R, Rodrigues A, Duro D, Oliveira CR. Laboratory of Neurochemistry, Neurology Department, Coimbra University Hospital; Portugal Center for Neuroscience and Cell Biology Faculty of Medicine, University of Coimbra, Portugal.




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