Abnormal expression of liver autophagy and apoptosis-related mRNA in fatty liver haemorrhagic syndrome and improvement function of resveratrol in laying hens

Abstract

Fatty liver haemorrhagic syndrome (FLHS) is characterized by hepatic rupture and haemorrhage leading to sudden death in laying hens. Resveratrol (Res) is a natural polyphenol with antioxidant and anti-inflammatory effects that can ameliorate chronic liver disease. The aim of this study was to investigate the improved effect of Res on the altered expression of autophagy and apoptosis-related genes in laying hens with FLHS. A total of 144 healthy 150-day-old laying hens were randomly divided into four groups: control group (standard diet), HELP group (high-energy-low-protein (HELP) diet), HELP + Res group (HELP diet with 400 mg/kg Res) and Res group (standard diet with 400 mg/kg Res). Histopathological lesions of the liver and the mRNA levels of Beclin-1, Atg5, Atg7, p62, Bcl-2, Bax and Caspase-3 on days 40, 80, and 120 were measured. The results showed that lipid accumulation and hepatocyte damage in the HELP group were more serious than those in the HELP + Res group. The mRNA levels of Beclin-1, Atg5, Atg7, and Bcl-2 in the HELP and HELP + Res groups were strikingly declined (<i>P </i>< 0.01) compared to the control group, and their mRNA levels were markedly higher in HELP group than those in the HELP + Res group (<i>P </i>< 0.05). Additionally, the mRNA levels of p62, Bax and Caspase-3 were significantly increased in the HELP and HELP + Res groups (<i>P </i>< 0.01 or <i>P </i>< 0.05), but their mRNA levels in the HELP group were higher than those in the HELP + Res group (<i>P </i>< 0.05). Collectively, FLHS could induce severe lipid accumulation, abnormal mRNA levels of liver autophagy and apoptosis-related genes. Res as a dietary supplement could attenuate these abnormal changes.