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Selenium protects cerebral ischemia in rat brain mitochondria

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Abstract

Normal cellular metabolism produces oxidants that are neutralized by the cells' antioxidant enzymes and antioxidants taken from outside. An imbalance between oxidant and antioxidant has been postulated to lead to the neurodegeneration in the ischemic condition. In this study, we have demonstrated the prevention or slowdown of neuronal injury in middle cerebral artery occlusion (MCAO) by sodium selenite. Rats were pretreated with 0.05, 0.1, and 0.2 mg/kg body wt of sodium selenite for 7 d. The rats of group I (sham) and group II (ischemia) were pretreated with physiological saline for 7 d. On d 8, MCAO was induced for 2 h in, the right side of brain of group II, III, IV, and V rats. Brains were dissect out after 22 h of reperfusion and washed with chilled physiological saline. The right cerebral hemisphere was used for the preparation of mitochondria. The activity of superoxide dismutase, catalase, glutathione peroxidase, glutathione-S-transferase, and monoamine oxidase (MAO-A and MAO-B) was depleted significantly; conversely, the activity of poly(ADP-ribosyl) polymerase was elevated significantly as compared to the sham, and the pretreatment of the animals with different doses of sodium selenite has protected the activity of these enzymes significantly. The content of glutathione was decreased significantly, whereas the level of lipid peroxidation was increased significantly in the mitochondria of MCAO as compared to the sham group, and pretreatment with different doses of sodium selenite has protected their levels significantly as compared to the MCAO group. It is concluded that selenium, which is an essential part of our diet, might be helpful in protection against neurodegeneration in cerebral ischemia.

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  1. Abdullah Shafique Ahmad, Muzamil Ahmad & Sofiyan Salim

    Present address: Department of Anesthesia, Critical Care Medicine, Johns Hopkins University School of Medicine, 600 North Wolfe Street, Blalock 1404-A, 21287, Baltimore, MD

Authors and Affiliations

  1. Neurotoxicology Laboratory, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, 110062, New Delhi, India

    Mubeen Ahmad Ansari, Abdullah Shafique Ahmad, Muzamil Ahmad, Sofiyan Salim, Seema Yousuf, Tauheed Ishrat & Fakhrul Islam

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Ansari, M.A., Ahmad, A.S., Ahmad, M. et al. Selenium protects cerebral ischemia in rat brain mitochondria. Biol Trace Elem Res 101, 73–86 (2004). https://doi.org/10.1385/BTER:101:1:73

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