Tert-Butyihydroquinone Protects Liver Against Ischemia/Reperfusion Injury in Rats Through Nrf2-Activating Anti-Oxidative Activity

Background. Hepatic ischemia/reperfusion (I/R) injury is a serious complication that occurs in surgical operations such as hepatectomy and liver transplantation. NF-E2-related factor 2 (Nrf2) is a transcription factor that has been proven against inflammatory and oxidative injury. Tert-butylhydroquinone (tBHQ), a widely used Nrf2 activator, is a common food preservative. In this study, we attempt to investigate the potential protective role of tBHQ in hepatic I/R injury. Methods. Twenty adult male rats were randomly divided into four groups: (1) sham+vehicle group; (2) I/R+vehicle group; (3) sham+tBHQ group; and (4) I/R+tBHQ group. The vehicle or tBHQ was divided into three injections at intervals of 12 hours in a model of hepatic I/R injury. Fluorescence quantitative polymerase chain reaction and Western blot analysis were used to examine Nrf2 mRNA and protein expression. The concentrations of malondialdehyde and superoxide dismutase activity were accessed, respectively. Results. Compared with the sham+vehicle group, Nrf2 expression, malondialdehyde, content and serum alanine aminotransferase were significantly increased in the I/R+vehicle group, whereas superoxide dismutase activity was significantly decreased. However, in the I/R+tBHQ group, tBHQ ameliorated tissue damage; promoted glutathione-S-transferase, quinine oxidoreductase 1, and glutamate cysteine ligase inductions; and regained redox homeostasis in comparison with the I/R+vehicle group. Furthermore, the present study indicated that preconditioning with tBHQ suppressed the I/R-induced increase in the apoptotic protein levels of caspase-3, as well as the I/R-induced decrease in the levels of anti-apoptotic protein bcl-2. Conclusions. t-BHQ exerted potent anti-inflammatory effects in I/R-induced liver injury, and tBHQ would be a new effectively therapeutic measure for preventing hepatic I/R injury during liver surgery.