title: Selective induction of hepatic cytochrome P450 2B activity by leelamine in vivo, as a potent novel inducer.
abstract: Cytochrome P450 (CYP) is an important enzyme that can act on xenobiotic substances such as toxic chemicals or drugs. Phenobarbital (PB) has been widely used to induce CYP2B activity to investigate the drug-drug interaction of CYP2B substrate drugs. Leelamine is a diterpene compound, and is the current focus of efforts to develop a treatment for diabetes. In this study, we identified the selective and potent inductive effect of leelamine on CYP2B at doses of 5, 10, or 20 mg/kg in male ICR mice for 1 or 3 days. In liver, the activity of CYP2B significantly increased 3.6-fold after treatment with leelamine, compared to vehicle-treated group. Activities of benzyloxyresorufin O-dealkylase and pentoxyresorufin O-dealkylase significantly increased 6.3- and 5.3-fold, respectively, with a single treatment of 20 mg/kg leelamine for 1 day. Furthermore, immunoblot analysis showed that significantly and dose-dependently increased CYP2B10 protein levels in liver. However, PCR results showed that there were no significant changes in the CAR and CYP2B mRNA levels after leelamine treatment. Accordingly, we suggest that leelamine is a novel substitute of PB for the selective induction of CYP2B activity in vivo.
authors: College of Pharmacy, Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, 702-701, Republic of Korea.
authors: JuHee
authors: J
authors: Sim
authors: Woongsik
authors: W
authors: Nam
authors: Doohyun
authors: D
authors: Lee
authors: Suyoun
authors: S
authors: Lee
authors: Hungchan
authors: H
authors: O
authors: Jeongmin
authors: J
authors: Joo
authors: Kwang-Hyeon
authors: KH
authors: Liu
authors: Jae Yun
authors: JY
authors: Han
authors: Sung Hwan
authors: SH
authors: Ki
authors: Tae Cheon
authors: TC
authors: Jeong
authors: Taeho
authors: T
authors: Lee
authors: Sangkyu
authors: S
authors: Lee
mesh_terms: D000818:Animals; D001835:Body Weight / Q000187:drug effects / Q000502:physiology; D019362:Cytochrome P-450 CYP2B1 / Q000096:biosynthesis*; D065693:Cytochrome P-450 Enzyme Inducers / Q000737:chemistry / Q000494:pharmacology; D004224:Diterpenes / Q000737:chemistry* / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation / Q000187:drug effects / Q000502:physiology; D004790:Enzyme Induction / Q000187:drug effects / Q000502:physiology; D008099:Liver / Q000187:drug effects* / Q000201:enzymology*; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR
chemical_list: D065693:Cytochrome P-450 Enzyme Inducers; D004224:Diterpenes; D019362:Cytochrome P-450 CYP2B1