title: Characterization of in vitro metabolites of cudratricusxanthone A in human liver microsomes.
abstract: Cudratricusxanthone A (CTXA), isolated from the roots of Cudrania tricuspidata, exhibits several biological activities; however, metabolic biotransformation was not investigated. Therefore, metabolites of CTXA were investigated and the major metabolic enzymes engaged in human liver microsomes (HLMs) were characterized using liquid chromatography-tandem mass spectrometry (LC-MS/MS). CTXA was incubated with HLMs or human recombinant CYPs and UGTs, and analysed by an LC-MS/MS equipped electrospray ionization (ESI) to qualify and quantify its metabolites. In total, eight metabolites were identified: M1-M4 were identified as mono-hydroxylated metabolites during Phase I, and M5-M8 were identified as O-glucuronidated metabolites during Phase II in HLMs. Moreover, these metabolite structures and a metabolic pathway were identified by elucidation of MS(n) fragments and formation by human recombinant enzymes. M1 was formed by CYP2D6, and M2-M4 were generated by CYP1A2 and CYP3A4. M5-M8 were mainly formed by UGT1A1, respectively. While investigating the biotransformation of CTXA, eight metabolites of CTXA were identified by CYPs and UGTs; these data will be valuable for understanding the in vivo metabolism of CTXA.
authors.affiliation: College of Pharmacy, Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, 702-701, Republic of Korea.
authors.forename: Juhee
authors.initials: J
authors.lastname: Sim
authors.affiliation: College of Pharmacy, Keimyung University, Daegu, 704-701, Republic of Korea.
authors.forename: Eunhwa
authors.initials: E
authors.lastname: Choi
authors.affiliation: College of Pharmacy, Keimyung University, Daegu, 704-701, Republic of Korea.
authors.forename: Gil-Saeng
authors.initials: GS
authors.lastname: Jeong
authors.affiliation: College of Pharmacy, Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, 702-701, Republic of Korea.
authors.forename: Sangkyu
authors.initials: S
authors.lastname: Lee
mesh_terms: D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D014453:Glucuronosyltransferase / Q000378:metabolism; D006801:Humans; D008862:Microsomes, Liver / Q000378:metabolism; D044004:Xanthones / Q000494:pharmacology*
chemical_list: D044004:Xanthones; C533013:cudratricusxanthone A; D003577:Cytochrome P-450 Enzyme System; D014453:Glucuronosyltransferase
keywords: CYP; UGT; cudratricusxanthone A; human liver microsomes