title: Two new steroidal saponins from the rhizomes of Dioscorea panthaica and their cytotoxic activity.
abstract: Two new steroidal saponins, dioscoresides C (1) and D (2), along with a new natural product, pregnadienolone 3-O-beta-gracillimatriose (3), and two known compounds, pregnadienolone 3-O-beta-chacotrioside (4) and pseudoprotodioscin (5), were isolated from the rhizomes of Dioscorea panthaica Prain et Burkill. On the basis of extensive NMR studies and chemical evidence, dioscoresides C and D were determined to be 26-O-beta-D-glucopyranosyl-3 beta,26-dihydroxy-23(S)-methoxy-25(R)-furosta-5,20(22)-dien-3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1-->4)]-beta-D-glucopyranoside and 26-O-beta-D-glucopyranosyl-3 beta,26-dihydroxy-20,22-seco-25(R)-furosta-5-en-20,22-dine-3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1--> 4)]-beta-D-glucopyranoside. These compounds showed mild cytotoxicity against the cancer cell lines, A375, L929, and HeLa, in a dose-dependent manner.
authors.affiliation: Research Center of New Drugs, Changchun College of Traditional Chinese Medicine, Changchun, People's Republic of China.
authors.forename: M
authors.initials: M
authors.lastname: Dong
authors.forename: X Z
authors.initials: XZ
authors.lastname: Feng
authors.forename: L J
authors.initials: LJ
authors.lastname: Wu
authors.forename: B X
authors.initials: BX
authors.lastname: Wang
authors.forename: T
authors.initials: T
authors.lastname: Ikejima
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D027742:Dioscorea; D004365:Drugs, Chinese Herbal; D006367:HeLa Cells; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D027343:Rhizome / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D013256:Steroids; D014407:Tumor Cells, Cultured
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004365:Drugs, Chinese Herbal; D010936:Plant Extracts; D012503:Saponins; D013256:Steroids; C452800:dioscoreside C; C452801:dioscoreside D