title: A new sesquiterpene lactone from the roots of Saussurea lappa: structure-anticancer activity study.
abstract: The dried roots of Saussurea lappa, called costus roots, are used in the traditional system of medicine for the treatment of cancer. In our investigation for the anticancer constituents from the hexane extract of this plant, a new sesquiterpene (1) was isolated along with the known compounds costunolide (2), beta-cyclocostunolide (3), dihydro costunolide (4) and dehydro costuslactone (5). Their structures were established by the extensive spectroscopic analyses. In addition, costunolide and beta-cyclocostunolide derivatives were synthesized using Michael-type addition reaction of NaOMe to the alpha-methylene-gamma-lactone moiety. All the compounds were tested for their in vitro cytotoxic activity. Compound 1 exhibited potent cytotoxic activity and other compounds displayed moderate activity.
authors.affiliation: Natural Products Laboratory, Division of Organic Chemistry-1, Indian Institute of Chemical Technology, Hyderabad 500 607, India.
authors.forename: A
authors.initials: A
authors.lastname: Robinson
authors.forename: T Vijay
authors.initials: TV
authors.lastname: Kumar
authors.forename: E
authors.initials: E
authors.lastname: Sreedhar
authors.forename: V G M
authors.initials: VG
authors.lastname: Naidu
authors.forename: Sistla Rama
authors.initials: SR
authors.lastname: Krishna
authors.forename: K Suresh
authors.initials: KS
authors.lastname: Babu
authors.forename: P V
authors.initials: PV
authors.lastname: Srinivas
authors.forename: J Madhusudana
authors.initials: JM
authors.lastname: Rao
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002626:Chemistry, Pharmaceutical / Q000379:methods; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D020128:Inhibitory Concentration 50; D007783:Lactones / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010936:Plant Extracts / Q000494:pharmacology*; D018517:Plant Roots / Q000378:metabolism*; D030441:Saussurea / Q000378:metabolism*; D012717:Sesquiterpenes / Q000737:chemistry*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D000970:Antineoplastic Agents; D007783:Lactones; D010936:Plant Extracts; D012717:Sesquiterpenes