title: Kaempferol glycosides and cardenolide glycosides, cytotoxic constituents from the seeds of Draba nemorosa (Brassicaceae).
abstract: Bioassay-directed fractionation of a methanolic extract from the seeds of Draba nemorosa (Brassicaceae) led to isolation of a new flavonol glycoside, drabanemoroside (5, kaempferol 3-O-alpha-L-rhamnopyranosyl-(1-->2)-alpha-L-arabinopyranose) along with four known flavonoid derivatives (1-4), four cardenolide glycosides (6-9). Kaempferol glycosides 2 and 5 showed strong cytotoxicity against human small lung cancer cell line A549 and melanoma SK-Mel-2 with an IC(50) of 0.5 microg/mL and 1.9 microg/mL, respectively. Cardenolide glycosides 6-9 showed potent cytotoxicity (A549) in the range of 0.01-0.032 microg/mL. Their structures were characterized based on spectroscopic data (2D NMR, HRTOFMS, IR, and UV) and comparison of literature values. The carbohydrate units were also confirmed by comparing the hydrolysate of 5 with authentic monosaccharides.
authors.affiliation: Department of Chemistry, Kongju National University, Gongju, 314-701, Korea. ssmoon@kongju.ac.kr
authors.forename: Surk-Sik
authors.initials: SS
authors.lastname: Moon
authors.forename: Md Aziz Abdur
authors.initials: MA
authors.lastname: Rahman
authors.forename: Md Maniruzzaman
authors.initials: MM
authors.lastname: Manir
authors.forename: V S
authors.initials: VS
authors.lastname: Jamal Ahamed
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology; D019607:Brassicaceae / Q000737:chemistry*; D002298:Cardenolides / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D006027:Glycosides / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D006801:Humans; D020128:Inhibitory Concentration 50; D044949:Kaempferols / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D008175:Lung Neoplasms / Q000188:drug therapy / Q000473:pathology; D008545:Melanoma / Q000188:drug therapy / Q000473:pathology; D051379:Mice; D012639:Seeds; D013057:Spectrum Analysis
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D002298:Cardenolides; D006027:Glycosides; D044949:Kaempferols