title: Chemical modification of alisol B 23-acetate and their cytotoxic activity.
abstract: The twelve-protostane analogues were synthesized from alisol B 23-acetate and assessed for their in vitro antitumor activity against six different human and murine tumor cell lines. Of the compounds synthesized, 23S-acetoxy-24R(25)-epoxy-11beta,23S-dihydroxyprotost-13(17)-en-3-hydroxyimine (12) exhibited significant cytotoxic activities against A549, SK-OV3, B16-F10, and HT1080 tumor cells with ED50 values of 10.0, 8.7, 5.2, and 3.1 microg/ml, respectively. Furthermore, 23S-acetoxy-13(17),24R(25)-diepoxy-11beta-hydroxyprotost-3-one (5), 13(17),24R(25)-diepoxy-11beta,23S-dihydroxyprotostan-3-one (6), 24R,25-epoxy-11beta,23S-dihydroxyprotost-13(17)-en-3-one (7), and 11beta,23S,24R,25-tetrahydroxyprotost-13(17)-en-3-one (9) showed moderate cytotoxic activities against B16-F10 and HT1080 tumor cells. These results mean that a hydroxyimino group at C-3 position in the protostane-type terpene enhances cytotoxic activity.
authors.affiliation: Korea Research Institute of Bioscience and Biotechnology, Daejon.
authors.forename: SangMyung
authors.initials: S
authors.lastname: Lee
authors.forename: ByungSun
authors.initials: B
authors.lastname: Min
authors.forename: KiHwan
authors.initials: K
authors.lastname: Bae
mesh_terms: D000085:Acetates / Q000737:chemistry / Q000633:toxicity; D000818:Animals; D002783:Cholestenones / Q000737:chemistry* / Q000633:toxicity*; D004354:Drug Screening Assays, Antitumor / Q000379:methods; D006801:Humans
chemical_list: D000085:Acetates; D002783:Cholestenones; C457232:alisol B