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Protective Role of Melatonin on Oxidative Stress Status and RNA Expression in Cerebral Cortex and Cerebellum of AβPP Transgenic Mice After Chronic Exposure to Aluminum

Author:
García, Tania, Esparza, José L., Giralt, Montserrat, Romeu, Marta, Domingo, José L., Gómez, Mercedes
Source:
Biological trace element research 2010 v.135 no.1-3 pp. 220-232
ISSN:
0163-4984
Subject:
Alzheimer disease, aluminum, animal models, antioxidant activity, catalase, cerebellum, cerebral cortex, chronic exposure, cortex, diet, free radical scavengers, gene expression, genes, glutathione, glutathione peroxidase, glutathione-disulfide reductase, melatonin, messenger RNA, mice, neurodegenerative diseases, oxidative stress, reverse transcriptase polymerase chain reaction, superoxide dismutase, thiobarbituric acid-reactive substances
Abstract:
Aluminum (Al) has been associated with pro-oxidant effects, as well as with various serious neurodegenerative diseases such as Alzheimer's disease (AD). On the other hand, melatonin (Mel) is a known antioxidant, which can directly act as free radical scavenger, or indirectly by inducing the expression of some genes linked to the antioxidant defense. In this study, 5-month-old AßPP female transgenic (Tg2576) (Tg) and wild-type mice were fed with Al lactate supplemented in the diet (1 mg Al/g diet). Concurrently, animals received oral Mel (10 mg/kg) until the end of the study at 11 months of age. Four treatment groups were included for both Tg and wild-type mice: control, Al only, Mel only, and Al + Mel. At the end of the treatment period, cortex and cerebellum were removed and processed to examine the following oxidative stress markers: reduced glutathione, oxidized glutathione, cytosolic Cu-Zn superoxide dismutase (SOD1), glutathione reductase (GR), glutathione peroxidase, catalase (CAT), and thiobarbituric acid reactive substances. Moreover, the gene expression of SOD1, GR, and CAT was evaluated by real-time RT-PCR. The biochemical changes observed in cortex and cerebellum suggest that Al acted as a pro-oxidant agent. Melatonin exerted an antioxidant action by increasing the mRNA levels of the enzymes SOD1, CAT, and GR evaluated in presence of Al and Mel, independently on the animal model.
Agid:
284705