title: Two novel ent-kauranoid diterpenoids from Isodon japonica leaves.
abstract: Two novel ent-kaurane diterpenoids, taihangjaponicain A (1), and taihangjaponicain B ( 2), and nine known diterpenoids, epinodosin (3), oridonin (4), epinodosinol (5), lasiokaurin ( 6), 1alpha- O-beta- D-glucopyranosylenmenol (7), lasiodonin (8), rabdosichuanin D ( 9), shikokianin (10) and rabdoternin A (11) were isolated from I. japonica leaves. The structures of the two new compounds were elucidated using 1-D and 2-D NMR spectroscopy. Compounds 1 and 3 - 11 were tested against HL-60, HO-8910 and A-549 human tumor cells. Compounds 4, 6 and 10 showed significant cytotoxicity against HL-60 cells with IC (50) values of 4.6, 2.0 and 3.4 microM, respectively, and against A-549 cells with IC (50) values of 17.5, 11.4 and 18.8 microM, respectively. Compound 6 exhibited moderate cytotoxicity against HO-8910 cells with an IC (50) value of 17.9 microM.
authors.affiliation: National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, PR China.
authors.forename: Su-Ping
authors.initials: SP
authors.lastname: Bai
authors.forename: Qing-Yi
authors.initials: QY
authors.lastname: Wei
authors.forename: Xiao-Ling
authors.initials: XL
authors.lastname: Jin
authors.forename: Quan-Xiang
authors.initials: QX
authors.lastname: Wu
authors.forename: Li
authors.initials: L
authors.lastname: Yang
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D045744:Cell Line, Tumor / Q000187:drug effects; D045786:Diterpenes, Kaurane / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D018922:HL-60 Cells / Q000187:drug effects; D006801:Humans; D020128:Inhibitory Concentration 50; D037602:Isodon; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D018515:Plant Leaves
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D045786:Diterpenes, Kaurane; D010936:Plant Extracts