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Oxidative Medicine and Cellular Longevity
Volume 2017, Article ID 3631565, 14 pages
Research Article

Hepatoprotective Effect of Polyphenol-Enriched Fraction from Folium Microcos on Oxidative Stress and Apoptosis in Acetaminophen-Induced Liver Injury in Mice

1Application Technique Engineering Center of Natural Cosmeceuticals, College of Fuijan Province, Xiamen Medical College, Xiamen, Fujian 361023, China
2Research Center of Natural Cosmeceuticals Engineering, Xiamen Medical College, Xiamen, Fujian 361023, China
3Fujian Provincial Key Laboratory of Biological Engineering on Traditional Herbs, Xiamen Medical College, Xiamen, Fujian 361023, China
4Technology and Engineering Center for Marine Biomedical Resource Utilization, Xiamen Medical College, Xiamen, Fujian 361023, China
5Department of Pharmacy, Xiamen Medical College, Xiamen, Fujian 361023, China

Correspondence should be addressed to Gang Zhang; nc.ude.cmmx@gz and Gueyhorng Wang; nc.ude.cmmx@hgw

Received 21 November 2016; Revised 24 February 2017; Accepted 20 March 2017; Published 23 May 2017

Academic Editor: Jie Li

Copyright © 2017 Hongtan Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Folium Microcos (FM), the leaves of Microcos paniculata L., shows various biological functions including antioxidant activity and α-glucosidase inhibitory effect. However, its therapeutic potential in acute liver injury is still unknown. This study investigated the hepatoprotective effect and underlying mechanisms of the polyphenol-enriched fraction (FMF) from Folium Microcos. FMF exhibited strong free radical scavenging activities and prevented HepG2/Hepa1–6 cells from hydrogen peroxide- (H2O2-) induced ROS production and apoptosis in vitro. Antioxidant activity and cytoprotective effects were further verified by alleviating APAP-induced hepatotoxicity in mice. Western blot analysis revealed that FMF pretreatment significantly abrogated APAP-mediated phosphorylation of MAPKs, activation of proapoptotic protein caspase-3/9 and Bax, and restored expression of antiapoptotic protein Bcl2. APAP-intoxicated mice pretreated with FMF showed increased nuclear accumulation of nuclear factor erythroid 2-related factor (Nrf2) and elevated hepatic expression of its target genes, NAD(P)H:quinine oxidoreductase 1 (NQO1) and hemeoxygenase-1(HO-1). HPLC analysis revealed the four predominantly phenolic compounds present in FMF: narcissin, isorhamnetin-3-O-β-D-glucoside, isovitexin, and vitexin. Consequently, these findings indicate that FMF possesses a hepatoprotective effect against APAP-induced hepatotoxicity mainly through dual modification of ROS/MAPKs/apoptosis axis and Nrf2-mediated antioxidant response, which may be attributed to the strong antioxidant activity of phenolic components.