title: Cytotoxic responses to aromatic ring and configurational variations in alpha-conidendrin, podophyllotoxin, and sikkimotoxin derivatives.
abstract: Derivatives of alpha-conidendrin, podophyllotoxin, and sikkimotoxin were prepared to evaluate the cytotoxic contributions of C-4 configuration and pendant and fused arene substitutions. Dimethyl-alpha-conidendryl alcohol (5), 9-deoxypodophyllol (6), and 9-deoxysikkimol (17) were dehydrated to their respective oxolane derivatives 4, 3, and 9. Diols 5 and 6 were converted via oxabicyclo[3.2.1]octanols 10 and 14 to target oxolanes 8 and 7 where C-4 had been inverted relative to that in 3 and 4. Cytotoxicities of the five oxolanes were determined in two drug-sensitive human leukemia and two multidrug-resistant cell lines expressing P-glycoprotein or multidrug-resistance associated protein (MRP). Changing the pendant arene configuration or replacing a m-methoxy by hydrogen resulted in a 100-fold cytotoxicity loss. Replacing a methylenedioxy group in the fused arene by two methoxy substituents reduced cytotoxicity by 10-fold. Drug-resistant cell lines were equally resistant to compounds 3, 4, 8, and 9 indicating that these four compounds do not serve as substrates of the transport proteins P-glycoprotein and MRP.
authors.affiliation: Department of Chemistry, State University of New York, College of Environmental Science and Forestry, Syracuse, New York 13210-2726, USA.
authors.forename: A
authors.initials: A
authors.lastname: Dantzig
authors.forename: R T
authors.initials: RT
authors.lastname: LaLonde
authors.forename: F
authors.initials: F
authors.lastname: Ramdayal
authors.forename: R L
authors.initials: RL
authors.lastname: Shepard
authors.forename: K
authors.initials: K
authors.lastname: Yanai
authors.forename: M
authors.initials: M
authors.lastname: Zhang
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism; D018528:ATP-Binding Cassette Transporters / Q000378:metabolism; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D017705:Lignans; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008968:Molecular Conformation; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D011034:Podophyllotoxin / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013764:Tetrahydronaphthalenes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018528:ATP-Binding Cassette Transporters; D000970:Antineoplastic Agents; D017705:Lignans; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D011034:Podophyllotoxin; D013764:Tetrahydronaphthalenes; C421915:conidendrin