title: Cytotoxic and DNA damage-inducing activities of low molecular weight phenols from rhubarb.
abstract: Six new phenol (anthraquinone or stilbene) glycosides with an acyl group at 6-position of the glucopyranose moiety were isolated from rhubarb (the roots of Rheum palmatum) cultivated in Japan, together with 22 known compounds. Most of these compounds were evaluated for cytotoxic activity against tumor and normal cells and for induction of DNA damage by spore rec-assay. Among them, emodin and aloe-emodin showed higher cytotoxic activities against human oral squamous cell carcinoma (HSC-2) and salivary gland tumor (HSG) cell lines than against normal human gingival fibroblasts (HGF). Chrysophanol 8-O-beta-(6'-acetyl)glucopyranoside, 4-(4'-hydroxyphenyl)-2-butanone 4'-O-beta-D-(2"-O-galloyl-6"-O-cinnamoyl) glucopyranoside, and 6"-O-(4'''-hydroxybenzoyl) resveratroloside exhibited relatively higher cytotoxic activities against all these cells. The other glycosides of anthraquinone or stilbene showed weaker cytotoxic activity against these tumor cell lines, but may be considered as cancer chemopreventive agents. Spore rec-assay with a recombination deficient mutant of Bacillus subtilis M45 demonstrated the DNA damage-inducing activity of emodin and aloe-emodin 15-O-beta-D-glucopyranoside among, rhubarb phenols.
authors.affiliation: School of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, Japan.
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Shi
authors.forename: T
authors.initials: T
authors.lastname: Fukai
authors.forename: H
authors.initials: H
authors.lastname: Sakagami
authors.forename: J
authors.initials: J
authors.lastname: Kuroda
authors.forename: R
authors.initials: R
authors.lastname: Miyaoka
authors.forename: M
authors.initials: M
authors.lastname: Tamura
authors.forename: N
authors.initials: N
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Nomura
mesh_terms: D001412:Bacillus subtilis / Q000187:drug effects; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy; D004249:DNA Damage; D004354:Drug Screening Assays, Antitumor; D006027:Glycosides / Q000302:isolation & purification / Q000633:toxicity; D006801:Humans; D008826:Microbial Sensitivity Tests; D008970:Molecular Weight; D009062:Mouth Neoplasms / Q000188:drug therapy; D010636:Phenols / Q000302:isolation & purification* / Q000633:toxicity*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D018517:Plant Roots / Q000737:chemistry; D012250:Rheum / Q000737:chemistry*; D014407:Tumor Cells, Cultured
chemical_list: D006027:Glycosides; D010636:Phenols; D010936:Plant Extracts