Quercetin protects liver injury induced by bile duct ligation via attenuation of Rac1 and NADPH oxidase1 expression in rats
Razieh Kabirifar, Zohreh-al-sadat Ghoreshi, Fatemeh Safari, Alireza Karimollah, Ali Moradi and Ebrahim Eskandari-nasab
Yazd, Iran
Author Affiliations: Department of Biochemistry (Kabirifar R, Ghoreshi Z and Moradi A), Department of Physiology (Safari F) and Department of Pharmacology (Karimollah A), School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran; Department of Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran (Eskandari-nasab E)
Corresponding Author: Ali Moradi, PhD, Department of Biochemistry, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran (Email: morady2008@gmail.com)
Abstract：BACKGROUND: Bile duct ligation (BDL) and subsequent cholestasis are correlated with oxidative stress, hepatocellular injury and fibrosis. Quercetin is a flavonoid with antifibrotic, and hepatoprotective properties. However, the molecular mechanism underlying quercetin-mediated hepatoprotection is not fully understood. The current study was to evaluate mechanisms of hepatoprotective effect of quercetin in BDL rat model.
METHODS: We divided male Wistar rats into 4 groups (n=8 for each): sham, sham+quercetin (30 mg/kg per day), BDL, BDL+quercetin (30 mg/kg per day). Four weeks later, the rats were killed, the blood was collected for liver enzyme measurements and liver for the measurement of Rac1, Rac1-GTP and NOX1 mRNA and protein levels by quantitative PCR and Western blotting, respectively.
RESULTS: Quercetin significantly alleviated liver injury in BDL rats as evidenced by histology and reduced liver enzymes. Furthermore, the mRNA and protein expression of Rac1, Rac1-GTP and NOX1 were significantly increased in BDL rats compared with those in sham (P<0.05); quercetin treatment reversed these variables back toward normal (P<0.05). Another interesting finding was that the antioxidant markers e.g. superoxide dismutase and catalase were elevated in quercetin-treated BDL rats compared to BDL rats (P<0.05).
CONCLUSIONS: Quercetin demonstrated hepatoprotective activity against BDL-induced liver injury through increasing antioxidant capacity of the liver tissue, while preventing the production of Rac1, Rac1-GTP and NOX1 proteins.
2017, Vol. 16 
