Roles of peroxisome proliferators activated receptors NF-κB and SOD in liver injury of obstructive jaundice in rats / 中华肝胆外科杂志

ABSTRACT

Objective To determine the expression of peroxisome proliferators-activated receptors (PPARs), nuclear factor-κB (NF-κB) and activity of superoxide dismutase (SOD) in rats with obstructive jaundice induced by bile duct ligation (BDL) and elucidate the molecular regulation mechanisms of hepatic injury due to obstructive jaundi(c)e. Methods All rats were sacrificed on the 7th day and 19th day after BDL and blood and liver tissue samples were obtained. SOD enzyme activity was detected by SOD kit. RT-PCR was performed to determine the mRNA expression of PPARs in all groups. The detection of PPARs protein and activation of NF-κB were performed using an immunohistochemical method. Results The activities of normal SOD and CuZn-SOD were decreased compared to the sham group (P＜0.01), and the decrease on 19th day after BDL were more significant. The level of PPARs expression in the BDL groups liver except the PPARβ in the BDL 7th group was reduced compared to the sham group (P＜0.01), and the level on the 19th day after BDL were more significantly reduced. PPARs protein expression was significantly inhibited (P＜0.01) in the sham group. SOD in BDL groups had significant positive correlation as compared with PPARs protein expression (P＜0.01), but NF-κBp65 protein expression had significant negative correlation as compared with PPARs protein expression (P＜0. 01). Conclusion PPARs are inhibited in expression level, and this inhibition becomes more significant as the pathological process progresses. PPARs might be key regulatory factors for SOD and NF-κB. The low expression of PPARs might be one of the important molecular mechanisms in liver injury due to obstructive jaundice.