Procyanidins inhibit zearalenone-induced apoptosis and oxidative stress of porcine testis cells through activation of Nrf2 signaling pathway

Abstract

The mycotoxin zearalenone (ZEA) in food and feed seriously harms human and animal health. How to reduce its toxicity is an important direction of current research on food safety. This study aim to assess the effects of procyanidins (PC) on cell apoptosis caused by ZEA and to clarify the role of Nrf2 in the process. Swine testicle (ST) cells were treated with ZEA (57.5 μmol/L) and/or PC (10 mg/L) for 24 h. Cell viability was detected by CCK-8 assay. Cell apoptosis and the level of ROS were detected by flow cytometry. The expression levels of mRNA and protein was detected by qRT-PCR and western blotting. Our results showed that ZEA reduced the antioxidant capacity of the ST cells, induced the cell apoptosis and inhibited the gene and protein expression of Nrf2 and its downstream genes (ho-1,nqo1), while PC improved the cell antioxidant capacity, reduced the degree of ZEA-induced cell apoptosis and promoted the gene and protein expression of Nrf2 and its downstream genes. However, when the Nrf2 small molecule inhibitor ML385 was added, the ability of PC to inhibit ZEA-induced cell apoptosis and promote the expression of Nrf2 and its downstream genes were decreased. Our results demonstrated that ZEA induced oxidative stress and apoptosis of ST cells, which were alleviated by PC intervention via activating Nrf2 signaling pathway. This finding of this study provided a molecular basis for the clinical application of PC to prevent ZEN-caused reproductive toxicity.

Keywords: Apoptosis; Nrf2; Oxidative stress; Procyanidins; Zearalenone.