title: Cytotoxic diterpenoids from the roots of Euphorbia ebracteolata.
abstract: Three new diterpenoids, yuexiandajisu D (1), E (2) and F were isolated from the roots of Euphorbia ebracteolata, along with eight known diterpenoids, jolkinolide B (4), jolkinolide A, ent-11alpha-hydroxyabieta-8(14),13(15)-dien-16,12alpha-olide (6), ent-(13S)-hydroxyatis-16-ene-3,14-dione, ent-3beta,(13S)-dihydroxyatis-16-en-14-one, ent-3-oxokaurane-16alpha,17-diol, ent-16alpha,17-dihydroxyatisan-3-one and ent-atisane-3beta,16alpha,17-triol. The structures of all compounds were deduced using spectroscopic methods and confirmed for 1 and 2 by single-crystal X-ray diffraction. A biogenetic pathway for the formation of 1 and 2 is proposed briefly. Cytotoxic activities were evaluated against ANA-1, B 16 and Jurkat tumor cells. Jolkinolide B (4) displayed modest activity on ANA-1, B 16 and Jurkat tumor cells with IC50 values 4.46 x 10(-2), 4.48 x 10(-2), 6.47 x 10(-2) microM, and ent-11alpha-hydroxyabieta-8(14),13(15)-dien-16,12alpha-olide (6) showed significant activity against ANA-1 and Jurkat cells with IC50 values 7.12 x 10(-3) and 1.79 x 10(-2) microM. Compound 1 was found to be slightly active against ANA-1 cells with an IC50 value 2.88 x 10(-1)microM. Structure-activity relationships of isolated compounds are also discussed.
authors.affiliation: Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, PR China.
authors.forename: Hai-Ming
authors.initials: HM
authors.lastname: Shi
authors.forename: Ian D
authors.initials: ID
authors.lastname: Williams
authors.forename: Herman H-Y
authors.initials: HH
authors.lastname: Sung
authors.forename: Hua-Xu
authors.initials: HX
authors.lastname: Zhu
authors.forename: Nancy Y
authors.initials: NY
authors.lastname: Ip
authors.forename: Zhi-Da
authors.initials: ZD
authors.lastname: Min
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D045744:Cell Line, Tumor; D004224:Diterpenes / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D028481:Euphorbia; D006801:Humans; D020128:Inhibitory Concentration 50; D051379:Mice; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D018517:Plant Roots; D013329:Structure-Activity Relationship; D014961:X-Ray Diffraction
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; D010936:Plant Extracts