title: A combined Hansch/Free-Wilson approach as predictive tool in QSAR studies on propafenone-type modulators of multidrug resistance.
abstract: A series of 48 propafenone-type modulators of multidrug resistance was synthesized and their P-glycoprotein inhibitory activity was measured using the daunomycin efflux assay. Both a Free-Wilson and a combined Hansch/Free-Wilson analysis were performed using log P, partial log P and molar refraction values as Hansch descriptors. The results of the Free-Wilson analysis show that modifications on the central aromatic ring generally influence pharmacological activity, whereby in almost all cases a decrease in MDR-modulating potency is observed (Q2cv = 0.66). The combined approach results in equations with remarkably higher predictive power (Q2cv = 0.83), specifically molar refractivity shows high significance in all equations derived. This indicates that polar interactions also contribute to protein binding.
authors.affiliation: Institute of Pharmaceutical Chemistry, University of Vienna, Wien.
authors.forename: C
authors.initials: C
authors.lastname: Tmej
authors.forename: P
authors.initials: P
authors.lastname: Chiba
authors.forename: M
authors.initials: M
authors.lastname: Huber
authors.forename: E
authors.initials: E
authors.lastname: Richter
authors.forename: M
authors.initials: M
authors.lastname: Hitzler
authors.forename: K J
authors.initials: KJ
authors.lastname: Schaper
authors.forename: G
authors.initials: G
authors.lastname: Ecker
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000037:antagonists & inhibitors*; D000903:Antibiotics, Antineoplastic / Q000378:metabolism; D002460:Cell Line; D003630:Daunorubicin / Q000378:metabolism; D018432:Drug Resistance, Multiple / Q000502:physiology*; D019008:Drug Resistance, Neoplasm; D006801:Humans; D011405:Propafenone / Q000031:analogs & derivatives / Q000737:chemistry* / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000903:Antibiotics, Antineoplastic; D011405:Propafenone; D003630:Daunorubicin