02436nas a2200229 4500008004100000245014000041210006900181260001800250300001200268490000600280520167600286653001801962653002401980653001102004653001502015653002802030100002302058700001802081700002302099700001702122856006702139 2011 eng d00aProtective Effects of Goldenseal (Hydrastis canadensis L.) on Acetaminophen-induced Hepatotoxicity through Inhibition of CYP2E1 in Rats0 aProtective Effects of Goldenseal Hydrastis canadensis L on Aceta cNovember,2011 a250-2550 v33 a

Background: Goldenseal (Hydrastis canadensis L.) inhibits various cytochrome P450 (CYP) isoforms such as CYP2C9, CYP2C19, CYP2D6, CYP2E1, and CYP3A in vitro. High doses of acetaminophen (APAP) generate the highly reactive intermediate, N-acetyl-p-benzoquinone imine (NAPQI), catalyzed mainly by CYP2E1. The aim of this study was to investigate the hepatoprotective effects of orally administrated goldenseal against APAP-induced acute liver failure (ALF) via inhibition of CYP2E1. Materials and Methods: Male Wistar rats were treated orally with goldenseal (300 and 1000 mg/ kg) 2, 18, and 26 h before and 6 hr after oral APAP (400 mg/kg) administration. Serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities as well as serum APAP concentration were evaluated. Results: Goldenseal extract inhibited CYP1A2, CYP2D6, CYP2E1, and CYP3A activity, and the inhibitory effect on CYP2E1 was the strongest (IC50 4.32 μg/mL). Treatment with goldenseal (300 mg/kg) significantly attenuated the APAP-induced increase in serum AST and ALT, and the hepatoprotective effect of goldenseal was stronger than that of silymarin (200 mg/kg). Moreover, serum APAP concentration was increased by goldenseal treatment, presumably as a result of the inhibitory effect of goldenseal on the metabolism of APAP to NAPQI. Conclusion: These results suggest that goldenseal ameliorates APAP-induced ALF and that this protection can likely be attributed to the inhibition of CYP2E1 activity, which generates the highly reactive intermediate of APAP.

10aAcetaminophen10aacute liver failure10aCYP2E110aGoldenseal10aHepatoprotective effect1 aYamaura, Katsunori1 aShimada, Maki1 aNakayama, Noriyuki1 aUeno, Koichi uhttps://www.phcogres.com/article/2011/3/4/1041030974-849089745