title: Quantitative structure-activity relationship analysis of inhibitors of the nicotine metabolizing CYP2A6 enzyme.
abstract: The purpose of this study was to develop screening and in silico modeling methods to obtain accurate information on the active center of CYP2A6, a nicotine oxidizing enzyme. The inhibitory potencies of 26 naphthalene and 16 non-naphthalene derivatives were determined for human CYP2A6 and mouse CYP2A5 enzymes. Several comparative molecular field analysis (CoMFA) models were developed to find out what types of steric and electrostatic properties are required for potent inhibitors. The IC(50) values of the tested compounds varied from 0.55 to 35 400 microM for CYP2A6 and from 1 to 1500 microM for CYP2A5. The generated CoMFA models were able to accurately predict the inhibition potencies of an external test set of chemicals. Potent and specific inhibitors of the CYP2A6 enzyme can be used in the future to increase nicotine bioavailability and thus make oral nicotine administration feasible in smoking cessation therapy.
authors.affiliation: Department of Pharmacology and Toxicology, University of Kuopio, POB 1627, 70211 Kuopio, Finland.
authors.forename: Minna
authors.initials: M
authors.lastname: Rahnasto
authors.forename: Hannu
authors.initials: H
authors.lastname: Raunio
authors.forename: Antti
authors.initials: A
authors.lastname: Poso
authors.forename: Carsten
authors.initials: C
authors.lastname: Wittekindt
authors.forename: Risto O
authors.initials: RO
authors.lastname: Juvonen
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000037:antagonists & inhibitors* / Q000737:chemistry* / Q000378:metabolism; D065637:Cytochrome P-450 CYP2A6; D000072467:Cytochrome P450 Family 2; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000494:pharmacology; D005260:Female; D006801:Humans; D008297:Male; D051379:Mice; D006899:Mixed Function Oxygenases / Q000037:antagonists & inhibitors* / Q000737:chemistry* / Q000378:metabolism; D009538:Nicotine / Q000378:metabolism*; D021281:Quantitative Structure-Activity Relationship
chemical_list: D004791:Enzyme Inhibitors; D009538:Nicotine; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C585710:CYP2A6 protein, human; C585520:Cyp2a5 protein, mouse; D065637:Cytochrome P-450 CYP2A6; D000072467:Cytochrome P450 Family 2