Does low concentration mycotoxin exposure induce toxicity in HepG2 cells through oxidative stress?. (23rd July 2020)

• Record Type: Journal Article
• Authors: Taroncher, Mercedes; Pigni, Maria-Chiari; Diana, Maria-Natalia; Juan-García, Ana; Ruiz, Maria-Jose
• Is Part Of: Toxicology mechanisms and methods. Volume 30:Number 6(2020)
• Page Start: 417
• Page End: 426
• Publication Date: 2020-07-23
• Subjects: Mycotoxins -- HepG2 cells -- low concentrations -- cellular response; Analytical toxicology -- Periodicals; Toxicology -- Periodicals; Toxicology -- Methodology -- Periodicals; 615.907
• DOI: 10.1080/15376516.2020.1757000
• Languages: English
• ISSNs: 1537-6516

Abstract

Abstract: The purpose of this study was to determine whether exposure to low concentrations of deoxynivalenol (DON), T-2 toxin (T-2) and patulin (PAT) in a human hepatocellular carcinoma cell line (HepG2) exerts toxic effects through mechanisms related to oxidative stress, and how cells deal with such exposure. Cell viability was determined by the MTT and protein content (PC) assays over 24, 48 and 72 h. The IC50 values detected ranged from >10 to 2.53 ± 0.21 μM (DON), 0.050 ± 0.025 to 0.034 ± 0.007 μM (T-2) and 2.66 ± 0.66 to 1.17 ± 0.21 µM (PAT). The key players in oxidative stress are the generation of reactive oxygen species (ROS), lipid peroxidation (LPO) and mitochondrial membrane potential (MMP) dysfunction. The results obtained showed that PAT, DON and T-2 did not significantly increase LPO or ROS production with respect to the controls. Moreover, PAT and DON did not alter MMP, though T-2 increased MMP at the higher concentrations tested (17 and 34 nM). In conclusion, the exposure of HepG2 cells to nontoxic concentrations of T-2 condition them against subsequent cellular oxidative conditions induced by even higher concentrations of mycotoxin.