Induction Effect of Bisphenol A on Gene Expression Involving Hepatic Oxidative Stress in Rat

Background and Objective. Bisphenol A (BPA) is an abundantly used xenoestrogenic chemical which may cause various disorders in body. In the present study, we sought to investigate the effects of various doses of BPA on hepatic oxidative stress-related gene expression in rats. Methods. Male Wistar rats weighing 150-200 g were used in this study. Three doses of the BPA (5, 25, and 125 mu g/kg) in corn oil were administered as gavage during 35 consecutive days. After the experiment, the rats were expired and the livers were removed and stored at -80 degrees C freezer for RNA extraction. Findings. The Real Time PCR showed increased expression of HO-1 in the rats receiving BPA doses compared to the control group. This effect was dose-dependent and higher at doses of 25 and 125 mu g/kg than 5 mu g/kg of body weight (p < 0.05). It was also demonstrated that various doses BPA can increase GADD45B gene expression compared to control group. That expression was significantly dominant in the lowest dose (5 mu g/kg) of the BPA (p < 0.05). The final body weights (168.0 +/- 10.0 gr) in the treatment group [BPA (125 mu g/kg)] showed a significant decrease compared to control group (191.60 +/- 6.50 gr). Conclusion. These findings demonstrate that BPA generated ROS and increased the antioxidant gene expression that causes hepatotoxicity.