title: Steroidal saponins from the bulbs of Lilium speciosum x L. nobilissimum 'Star Gazer' and their antitumour-promoter activity.
abstract: The fresh bulbs of the oriental hybrid lily, Lilium speciosum x L. nobilissimum 'Star Gazer' yielded a new steroidal saponin, (25R,26R)-26-methoxyspirost-5-en-3 beta-ol 3-O-[O-alpha-L-rhamnopyranosyl-(1-->2)-O-[6-O-acetyl-beta-D-glucopyranos yl- (1-->4)]-beta-D-glucopyranoside], along with four known steroidal saponins, (25R,26R)-26-methoxyspirost-5-en-3 beta-ol 3-O-[O-alpha-L-rhamnopyranosyl-(1-->2)-O-]beta-D-glucopyranosyl-(1-->4)] - beta-D-glucopyranoside], (25R)-27-O-[(S)-3-hydroxy-3-methylglutaryl]- spirost-5-ene-3 beta, 27-diol 3-O-[O-alpha-L-rhamnopyranosyl-(1-->2)-beta-D- glucopy-ranoside] and (25R)-27-O-[(S)-3-hydroxy-3-methylglutaryl]- spirost-5-eene-3 beta, 27-diol 3-O-[O-alpha-L-rhamnopyranosyl-(1-->2)-O- O-[beta-D-glucoyranosyl-(1-->4)]-beta-D-glucoyranoside]. The structure of The structure of the new saponin was determined by means of spectroscopic analysis and hydrolysis. The methyl ester of 5 showed potent inhibitory activity on 12-O-tetradecanoylphorbol-13-acetate (TPA)-stimulated 32P incorporation into phospholipids of HeLa cells.
authors.affiliation: Tokyo College of Pharmacy, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Mimaki
authors.forename: H
authors.initials: H
authors.lastname: Nishino
authors.forename: Y
authors.initials: Y
authors.lastname: Sashida
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002240:Carbohydrate Sequence; D004354:Drug Screening Assays, Antitumor; D006367:HeLa Cells; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010840:Phytosterols / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D010946:Plants, Medicinal / Q000737:chemistry*; D013755:Tetradecanoylphorbol Acetate
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D010840:Phytosterols; D013755:Tetradecanoylphorbol Acetate