title: Requirements for P-glycoprotein recognition based on structure-activity relationships in the podophyllotoxin series.
abstract: Podophyllotoxin and epipodophyllotoxin react with tubulin at the same binding site as colchicine, but in contrast to colchicine, do not appear to exert their cytotoxicities by mechanisms dependent on P-glycoprotein (Pgp) expression. To investigate structural requirements for Pgp recognition a series of podophyllotoxin and epipodophyllotoxin derivatives have been synthesized. Their interactions with the multidrug resistance-related protein Pgp have been studied by evaluating their relative cytotoxicities versus P388-sensitive murine leukemic cells and a classic multidrug-resistant (MDR) Pgp-overexpressing subline (P388/ADR), and their relative tubulin polymerization inhibitory activities against microtubular proteins have been determined. Based on tridimensional structure-activity relationships within this series of compounds, structural requirements for Pgp recognition have been identified. Moreover, proposals are made for extending these criteria to other chemical classes of anticancer drugs.
authors.affiliation: Division de Cancérologie Experimentale I, Centre de Recherche Pierre Fabre, Castres, France.
authors.forename: C
authors.initials: C
authors.lastname: Etievant
authors.forename: P
authors.initials: P
authors.lastname: Schambel
authors.forename: Y
authors.initials: Y
authors.lastname: Guminski
authors.forename: J M
authors.initials: JM
authors.lastname: Barret
authors.forename: T
authors.initials: T
authors.lastname: Imbert
authors.forename: B T
authors.initials: BT
authors.lastname: Hill
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000737:chemistry*; D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D051379:Mice; D008868:Microtubule Proteins / Q000737:chemistry; D008958:Models, Molecular; D011034:Podophyllotoxin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D014404:Tubulin / Q000737:chemistry; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000972:Antineoplastic Agents, Phytogenic; D008868:Microtubule Proteins; D014404:Tubulin; D011034:Podophyllotoxin