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The possible neuroprotective effects of melatonin in aluminum chloride-induced neurotoxicity via antioxidant pathway and Nrf2 signaling apart from metal chelation

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Abstract

Aluminum (Al) had well-identified adverse influences on the nervous system mainly through the creation of reactive oxygen species (ROS). Melatonin works as an antioxidant through the inhibition of ROS and attenuating peroxidation of lipids. Nuclear factor (erythroid-derived 2)-like 2 (Nrf2) is a pivotal transcription factor which controls the transcription of antioxidant enzymes. This study was conducted to determine the potential neuroprophylactic impacts of melatonin in aluminum chloride (AlCl3)-initiated neurotoxicity including potential mechanism(s) of action and relevant signaling in rats. Thirty-six male rats were distributed into 4 groups: Control; AlCl3 (50 mg/kg bwt, i.p, 3 times weekly for 3 months); melatonin (5 mg/kg bwt, i.p daily for 2 weeks before AlCl3 and sustained for the next 3 months); and melatonin with AlCl3. Neuronal alterations were histopathologically and biochemically evaluated. The neuronal antioxidant-related genes and relevant Nrf2 protein expression were determined by real-time PCR and Western blotting, respectively. The current data showed a substantial increase in brain damage biomarkers, acetylecholinesterase (AchE) activity, and malondialdehyde (MDA) content while the enzymatic antioxidant expression as glutathione-s-transferase (GST), catalase (CAT), and superoxide dismutase (SOD) were substantially attenuated in the aluminum-treated group, with cleared histopathological changes as inflammatory cell infiltration with neuronal degeneration. Supplementation of melatonin resulted in an obvious amelioration in all previous abnormal alteration observed in AlCl3-treated rats rather than increased Al burden and/or altered Fe and Cu homeostasis with upregulating both total and phosphorylated Nrf2 expression. Therefore, the study concluded that melatonin has a potential ability to be neuroprophylactic against Al-induced neurotoxic effect and oxidative damage in the rat brain through upregulating and instigating Nrf2 signaling apart from metal chelation.

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Authors and Affiliations

  1. Department of Biochemistry, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt

    Kadry M. Sadek

  2. Department of Biochemistry, Faculty of Veterinary Medicine, Alexandria University, Alexandria, Egypt

    Mohamed A. Lebda

  3. Department of Biochemistry, Faculty of Veterinary Medicine, Kafr El-sheikh University, Kafr El-sheikh, Egypt

    Tarek K. Abouzed

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  1. Kadry M. Sadek
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  2. Mohamed A. Lebda
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  3. Tarek K. Abouzed
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Correspondence to Kadry M. Sadek.

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Sadek, K.M., Lebda, M.A. & Abouzed, T.K. The possible neuroprotective effects of melatonin in aluminum chloride-induced neurotoxicity via antioxidant pathway and Nrf2 signaling apart from metal chelation. Environ Sci Pollut Res 26, 9174–9183 (2019). https://doi.org/10.1007/s11356-019-04430-9

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