Abstract The present study was conducted to observe the protective effects of c9, t11- conjugated linoleic acid (CLA) on oxidative stress and inflammation in bovine mammary epithelial cells (BMECs) exposed to H₂O₂. The BMECs were treated with different concentrations of H₂O₂ for 8 h to determine damage concentration and different c9, t11-CLA concentrations for 24 h to determine the effective concentrations. H₂O₂ of 600 μmol/L and c9, t11-CLA of 50 μmol/L and 100 μmol/L were selected for subsequent analyses. Thus, four BMEC groups were established: Control group; H₂O₂ group; c9, t11-CLA (50) + H₂O₂ group; and c9, t11-CLA (100) + H₂O₂ group. We observed that the H₂O₂ group exhibited significantly lower total antioxidant activity (T-AOC), superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) activities and significantly higher secretions of malondialdehyde (MDA), interleukin (IL)-1β, IL-6, IL-8, and tumor necrosis factor (TNF)-α and expressions of IL-1β, IL-6, and IL-8 than the control group (p > 0.05). Pretreatment with c9, t11-CLA enhanced SOD, CAT, and GPx activities and mRNA expression and repressed IL-6 and IL-8 secretion and expression in H₂O₂-treated BMECs (p > 0.05). In conclusion, c9, t11-CLA treatment efficiently enhanced antioxidant capacity and decreased inflammation induced by H₂O₂ in BMECs.
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Zhang et al. (2024) studied this question.
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