CYP3A4型
CYP1A2
化学
细胞色素P450
CYP3A型
孕烷X受体
CYP2B6型
谷胱甘肽
CYP2E1
雄激素受体
姜科
微粒体
代谢物
药理学
CYP1B1型
生物化学
体外
酶
生物
核受体
转录因子
根茎
基因
生态学
作者
Prapapan Pimkaew,Jenni Küblbeck,Aleksanteri Petsalo,Jouni Jukka,Apichart Suksamrarn,Risto O. Juvonen,Seppo Auriola,Pawinee Piyachaturawat,Paavo Honkakoski
标识
DOI:10.1016/j.tiv.2013.07.004
摘要
Misclassification of Curcuma species (family Zingiberaceae) may lead to unwanted human exposure to Curcuma elata sesquiterpenes zederone and germacrone which have caused hepatotoxicity and changes in CYP expression in laboratory animals. We investigated how these compounds interact with the human cytochrome P450 (CYP) system, in order to evaluate their potential for human liver toxicity and herb-drug interactions. We found that both sesquiterpenes (1-30 μM) greatly induced expression of CYP2B6 and CYP3A4 but not CYP1A2 mRNAs in human primary hepatocytes (HPHs). This induction profile correlated with activation of constitutive androstane and pregnane X receptors. Cytotoxicity was also observed in exposed HPHs. CYP inhibition studies with pooled human liver microsomes (HLMs) indicated that zederone and germacrone moderately inhibited CYP2B6 and CYP3A4 activities in vitro, with IC50 values below 10 μM. When zederone was incubated with HLMs and NADPH, one di-epoxide metabolite was formed and by using glutathione trapping, five epoxide-derived conjugates were detected. Germacrone produced two oxidized metabolites and four glutathione conjugates. The results suggest that enzymes in HLMs convert sesquiterpenes into reactive, electrophilic compounds which may be causative for the reported liver injuries. These findings provide insight on the safety and drug-herb interactions of the Curcuma species.
科研通智能强力驱动
Strongly Powered by AbleSci AI