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Biological Trace Element Research

, Volume 135, Issue 1–3, pp 220–232 | Cite as

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

  • Tania García
  • José L. Esparza
  • Montserrat Giralt
  • Marta Romeu
  • José L. Domingo
  • Mercedes Gómez
Article

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.

Keywords

Aluminum Melatonin Tg2576 mice Oxidative stress Gene expression 

Notes

Acknowledgment

Financial support for this study was provided by the “Fondo de Investigación Sanitaria” (FIS), Ministry of Health, Spain, through grant number PI050622.

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Copyright information

© Humana Press Inc. 2009

Authors and Affiliations

  • Tania García
    • 1
  • José L. Esparza
    • 1
  • Montserrat Giralt
    • 2
  • Marta Romeu
    • 2
  • José L. Domingo
    • 1
  • Mercedes Gómez
    • 1
  1. 1.Laboratory of Toxicology and Environmental Health, IISPV, School of Medicine“Rovira i Virgili” UniversityReusSpain
  2. 2.Pharmacology Unit, School of Medicine“Rovira i Virgili” UniversityReusSpain

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