title: [Metabolic products and pathway of neferine in rat liver].
abstract: The present study utilized LC-MS and HPLC approaches to characterize the metabolites of neferine in rat liver after an oral administration of 20 mg x kg(-1), and investigated the involvement of CYP450 isoforms in the metabolism of neferine by their selective inhibitors in vitro, separately. In positive ionization mode, besides neferine, four metabolites (M1-M4) were detected. M2 (the major metabolite) and M4 were identified as liensinine and isoliensinine by comparison with reference substances. Moreover, according to the analysis of metabolic rule of parent drug (neferine), M1 and M3 may be desmethylliensinine and desmethyl-isoliensinine, respectively. Furthermore, the metabolism of neferine in rat liver microsomes showed that the percentage inhibition of the major metabolism (liensinine) formation was 80.5% by quinidine (10 micromol x L(-1), selective CYP2D1 inhibitor) and 25.7% by ketoconazole (1 micromol x L(-1), selective CYP3A1 inhibitor). Neferine was mainly metabolized by CYP2D1 or CYP3A1 to liensinine, isoliensinine, desmethyl-liensinine and desmethyl-isoliensinine.
authors.affiliation: Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Huang
authors.forename: Li-bo
authors.initials: LB
authors.lastname: Zhao
authors.forename: Shuai
authors.initials: S
authors.lastname: Li
authors.forename: Ping
authors.initials: P
authors.lastname: Liu
authors.forename: Ben-rong
authors.initials: BR
authors.lastname: Hu
authors.forename: Jia-ling
authors.initials: JL
authors.lastname: Wang
authors.forename: Ji-zhou
authors.initials: JZ
authors.lastname: Xiang
mesh_terms: D000284:Administration, Oral; D000429:Alcohol Oxidoreductases / Q000037:antagonists & inhibitors; D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000037:antagonists & inhibitors; D044182:Benzylisoquinolines / Q000008:administration & dosage / Q000302:isolation & purification / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D051544:Cytochrome P-450 CYP3A; D000072467:Cytochrome P450 Family 2; D007546:Isoquinolines / Q000378:metabolism*; D007654:Ketoconazole / Q000494:pharmacology; D008297:Male; D008862:Microsomes, Liver / Q000378:metabolism*; D031653:Nelumbo / Q000737:chemistry; D010636:Phenols / Q000378:metabolism*; D010946:Plants, Medicinal / Q000737:chemistry; D011802:Quinidine / Q000494:pharmacology; D051381:Rats; D012639:Seeds / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D044182:Benzylisoquinolines; D007546:Isoquinolines; D010636:Phenols; C499779:isoliensinine; C057222:neferine; C080095:liensinine; D000429:Alcohol Oxidoreductases; D001189:Aryl Hydrocarbon Hydroxylases; C504568:Cyp2d1 protein, rat; C465138:Cyp3a23-3a1 protein, rat; D051544:Cytochrome P-450 CYP3A; D000072467:Cytochrome P450 Family 2; D011802:Quinidine; D007654:Ketoconazole