title: In vivo microdialysis with LC-MS for analysis of spinosin and its interaction with cyclosporin A in rat brain, blood and bile.
abstract: Spinosin, a major bioactive herbal ingredient isolated from Semen Ziziphi Spinosae, plays an important role in sedation and hypnosis. However, the pharmacokinetic behavior of spinosin in special sites has not been reported. Microdialysis (MD) technique, as a continuous, realtime monitoring sampling technique, is very suitable for the evaluation of the disposition of diverse drugs. To obtain more useful information on spinosin, an in vivo microdialysis sampling technique with High Performance Liquid Chromatography-mass spectrograph (HPLC-MS) method was developed to investigate the pharmacokinetics of spinosin and its interaction with cyclosporin A (CsA) in the brain, blood and bile of rats. The method was validated in terms of selectivity, linearity and sensitivity, and showed advantages in monitoring the pharmacokinetic behavior of drugs. The results revealed that CsA has obvious effects on the pharmacokinetic process of spinosin. When co-administered, the area under the curve (AUC) of spinosin in blood, bile and brain increased from 205.70 to 673.51 mg min/L, 7.77 × 10(4) to 1.25 × 10(5) mg min/L, and 2.09 to 5.58 mg min/L, respectively. The t(1/2) values of spinosin in blood, bile and brain also changed from 48.07 to 95.04 min, from 97.20 to 152.21 and from 42.18 to 73.83 min, respectively. These results demonstrated that the CsA decreased the efflux of spinosin through the inhibition of P-glycoprotein (P-gp) efflux transporter and it might be used as a group of P-gp substrate. Other transporters or pathways may also be involved in the metabolism of spinosin.
authors.affiliation: State Key Laboratory of Natural Medicines (China Pharmaceutical University), Nanjing 210009, China.
authors.forename: Rong-Hua
authors.initials: RH
authors.lastname: Ma
authors.forename: Jie
authors.initials: J
authors.lastname: Yang
authors.forename: Lian-Wen
authors.initials: LW
authors.lastname: Qi
authors.forename: Gui-Zhong
authors.initials: GZ
authors.lastname: Xin
authors.forename: Chong-Zhi
authors.initials: CZ
authors.lastname: Wang
authors.forename: Chun-Su
authors.initials: CS
authors.lastname: Yuan
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Wen
authors.forename: Ping
authors.initials: P
authors.lastname: Li
mesh_terms: D000818:Animals; D001646:Bile / Q000378:metabolism*; D001923:Brain Chemistry / Q000187:drug effects / Q000502:physiology*; D002853:Chromatography, Liquid / Q000379:methods; D016572:Cyclosporine / Q000097:blood / Q000378:metabolism* / Q000494:pharmacology; D004347:Drug Interactions / Q000502:physiology; D004365:Drugs, Chinese Herbal / Q000378:metabolism*; D005419:Flavonoids / Q000037:antagonists & inhibitors / Q000097:blood / Q000378:metabolism*; D013058:Mass Spectrometry / Q000379:methods*; D017551:Microdialysis / Q000379:methods*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015854:Up-Regulation / Q000187:drug effects / Q000502:physiology
chemical_list: D004365:Drugs, Chinese Herbal; D005419:Flavonoids; C055669:spinosin; D016572:Cyclosporine