Journal
TOXICOLOGY LETTERS
Volume 226, Issue 3, Pages 337-342Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.toxlet.2014.02.023
Keywords
Beauvericin; Cytotoxicity; Oxidative stress; Enzymes; GSH; CHO-K1 cells
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Glutathione (GSH) levels, glutathione peroxidase (GPx), glutathione reductase (GR) and glutathione-S-transferase (GST) as antioxidant defense system were evaluated in CHO-K1 cells after beauvericin (BEA) exposure. The effect of N-acetyl-cysteine (NAC) pre-treatment was assessed. GSH levels significantly decrease 18% and 29% after 5 mu M of BEA in fresh medium and NAC pre-treatment, respectively compared to their controls. The GPx activity increased significantly from 35% to 66% in fresh medium and 20% in NAC pre-treatment. GR activity decreased after 5 mu M of BEA up to 43% and 53% in fresh medium and NAC pretreatment, respectively. The GST activity increased in fresh medium (from 61% to 89%) and decreased (from 22% to 35%) after NAC pre-treatment. Comparing BEA exposure in fresh medium and NAC pretreatment, GSH levels, GPx activity and GST activity increased 716%, 458% and 206%, respectively respect to fresh medium; conversely no changes were observed in GR activity. In addition, NAC is an effective scavenger of BEA. GSH and related enzymes play an antioxidant role in the defense system of CHO-K1 cells exposed to BEA. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
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