title: Pregnane glycoside multidrug-resistance modulators from Cynanchum wilfordii.
abstract: The methanol-soluble extracts of the roots of Cynanchum wilfordii showed a significant multidrug-resistance-reversing activity, and four known pregnane glycosides were isolated by bioassay-directed fractionation and separation. Their structures were identified as gagaminin 3-O-beta-D-cymaropyranosyl-(1-->4)-beta-D-oleandropyranosyl- (1-->4)-b eta-D-cymaropyranosyl-(1-->4)-beta-D-cymaropyranoside (1), wilfoside K1N (2), wilfoside C1N (3), and cynauricuoside A (4). In particular, compound 1, at a concentration level of 1 microM, was found to completely reverse the multidrug-resistance of KB-V1 and MCF7/ADR cells to adriamycin, vinblastine, and colchicine.
authors.affiliation: Natural Product Biosynthesis Research Unit, Korea Research Institute of Bioscience, and Biotechnology, P.O. Box 115, Yusong, Taejon 305-600, Korea.
authors.forename: B Y
authors.initials: BY
authors.lastname: Hwang
authors.forename: S E
authors.initials: SE
authors.lastname: Kim
authors.forename: Y H
authors.initials: YH
authors.lastname: Kim
authors.forename: H S
authors.initials: HS
authors.lastname: Kim
authors.forename: Y S
authors.initials: YS
authors.lastname: Hong
authors.forename: J S
authors.initials: JS
authors.lastname: Ro
authors.forename: K S
authors.initials: KS
authors.lastname: Lee
authors.forename: J J
authors.initials: JJ
authors.lastname: Lee
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002240:Carbohydrate Sequence; D003078:Colchicine / Q000494:pharmacology; D004317:Doxorubicin / Q000494:pharmacology; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D006801:Humans; D020128:Inhibitory Concentration 50; D007624:KB Cells; D008969:Molecular Sequence Data; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011278:Pregnanes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014747:Vinblastine / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D000972:Antineoplastic Agents, Phytogenic; D006027:Glycosides; D011278:Pregnanes; D014747:Vinblastine; D004317:Doxorubicin; D003078:Colchicine