title: Biologically active triterpenoids from Cephalaria ambrosioides.
abstract: The roots of Cephalaria ambrosioides yielded a new triterpene, 6alpha-hydroxyhederagenic acid ( 1), in addition to the known triterpene hederagenic acid ( 2) and four corresponding saponins, leontoside A (or akeboside Stb) ( 3), kalopanax saponin A (or alpha-hederin) ( 4), saponin PG (or sapindoside B) ( 5), and dipsacoside B ( 6). Their structures have been elucidated on the basis of their spectral data (MS, 1 D and 2 D NMR) and by some chemical transformations. The extract and all isolated compounds were evaluated for their antimicrobial, molluscicidal and IN VITRO cytotoxic activities. All compounds showed strong antimicrobial activity (MIC values 1.80 - 2.50 microg/mL), with 5 and 6 exhibiting activities comparable to those of standard antibiotics. Moreover, compounds 3 - 5 were active against all assayed cancer cell lines, whereas compounds 3 and 4 exhibited higher activities against Biomphalaria Glabrata snails, with minimum inhibitory concentrations of 5.4 and 6.2 microg/mL, respectively.
authors.affiliation: Department of Pharmacognosy and Natural Products Chemistry, School of Pharmacy, University of Athens, Athens, Greece.
authors.forename: Sofia
authors.initials: S
authors.lastname: Pasi
authors.forename: Nektarios
authors.initials: N
authors.lastname: Aligiannis
authors.forename: Harris
authors.initials: H
authors.lastname: Pratsinis
authors.forename: Alexios-Leandros
authors.initials: AL
authors.lastname: Skaltsounis
authors.forename: Ioanna B
authors.initials: IB
authors.lastname: Chinou
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D003603:Cytotoxins / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D049917:Dipsacaceae / Q000737:chemistry*; D006801:Humans; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D010571:Pest Control / Q000379:methods; D010575:Pesticides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D018517:Plant Roots; D012908:Snails; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*
chemical_list: C539440:6-hydroxyhederagenic acid; D000890:Anti-Infective Agents; D003603:Cytotoxins; D010575:Pesticides; D010936:Plant Extracts; D014315:Triterpenes