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http://dx.doi.org/10.4196/kjpp.2016.20.1.15

Carnosic acid protects against acetaminophen-induced hepatotoxicity by potentiating Nrf2-mediated antioxidant capacity in mice  

Guo, Qi (Department of Ultrasound, The Second Hospital Affiliated of Zhengzhou University)
Shen, Zhiyang (Department of Ultrasound, The Second Hospital Affiliated of Zhengzhou University)
Yu, Hongxia (Department of Ultrasound, The Second Hospital Affiliated of Zhengzhou University)
Lu, Gaofeng (Department of Gastroenterology, The Second Hospital Affiliated of Zhengzhou University)
Yu, Yong (Department of Gastroenterology, The Second Hospital Affiliated of Zhengzhou University)
Liu, Xia (Department of Gastroenterology, The Second Hospital Affiliated of Zhengzhou University)
Zheng, Pengyuan (Department of Gastroenterology, The Second Hospital Affiliated of Zhengzhou University)
Publication Information
The Korean Journal of Physiology and Pharmacology / v.20, no.1, 2016 , pp. 15-23 More about this Journal
Abstract
Acetaminophen (APAP) overdose is one of the most common causes of acute liver failure. The study aimed to investigate the protective effect of carnosic acid (CA) on APAP-induced acute hepatotoxicity and its underlying mechanism in mice. To induce hepatotoxicity, APAP solution (400 mg/kg) was administered into mice by intraperitoneal injection. Histological analysis revealed that CA treatment significantly ameliorated APAP-induced hepatic necrosis. The levels of both alanine aminotransferase (ALT) and aspartate transaminase (AST) in serum were reduced by CA treatment. Moreover, CA treatment significantly inhibited APAP-induced hepatocytes necrosis and lactate dehydrogenase (LDH) releasing. Western blot analysis showed that CA abrogated APAP-induced cleaved caspase-3, Bax and phosphorylated JNK protein expression. Further results showed that CA treatment markedly inhibited APAP-induced pro-inflammatory cytokines TNF-${\alpha}$, IL-$1{\beta}$, IL-6 and MCP-1 mRNA expression and the levels of phosphorylated $I{\kappa}B{\alpha}$ and p65 protein in the liver. In addition, CA treatment reduced APAP- induced hepatic malondialdehyde (MDA) contents and reactive oxygen species (ROS) accumulation. Conversely, hepatic glutathione (GSH) level was increased by administration of CA in APAP-treated mice. Mechanistically, CA facilitated Nrf2 translocation into nuclear through blocking the interaction between Nrf2 and Keap1, which, in turn, upregulated anti-oxidant genes mRNA expression. Taken together, our results indicate that CA facilitates Nrf2 nuclear translocation, causing induction of Nrf2-dependent genes, which contributes to protection from acetaminophen hepatotoxicity.
Keywords
Acetaminophen; Anti-oxidation; Carnosic acid; Hepatotoxicity; Nuclear factor erythroid 2-related factor 2;
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