title: Structure determination of inonotsuoxides A and B and in vivo anti-tumor promoting activity of inotodiol from the sclerotia of Inonotus obliquus.
abstract: Two new lanostane-type triterpenoids, inonotsuoxides A (1) and B (2) along with three known lanostane-type triterpenoids, inotodiol (3), trametenolic acid (4), and lanosterol (5), were isolated from the sclerotia of Inonotus obliquus (Pers.: Fr.) (Japanese name: Kabanoanakake) (Russian name: Chaga). Their structures were determined to be 22R,25-epoxylanost-8-ene-3beta,24S-diol (1) and 22S,25-epoxylanost-8-ene-3beta,24S-diol (2) on the basis of spectral data including single crystal X-ray analysis. These compounds except for 2 were tested for their inhibitory effects on Epstein-Barr virus early antigen (EBV-EA) activation induced by 12-O-tetradecanoylphorbol-13-acetate (TPA), as a test for potential cancer chemopreventive agents. The most abundant triterpene, inotodiol (3), was investigated for the inhibitory effect in a two-stage carcinogenesis test on mouse skin using 7,12-dimethylbenz[a]anthracene (DMBA) as an initiator and TPA as a promoter. Compound 3 was found to exhibit the potent anti-tumor promoting activity in the in vivo carcinogenesis test.
authors.affiliation: Department of Medicinal Chemistry, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Nakata
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yamada
authors.forename: Sayaka
authors.initials: S
authors.lastname: Taji
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Ohishi
authors.forename: Shun-Ichi
authors.initials: S
authors.lastname: Wada
authors.forename: Harukuni
authors.initials: H
authors.lastname: Tokuda
authors.forename: Kazuo
authors.initials: K
authors.lastname: Sakuma
authors.forename: Reiko
authors.initials: R
authors.lastname: Tanaka
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene / Q000737:chemistry; D000230:Adenocarcinoma / Q000188:drug therapy*; D000818:Animals; D000956:Antigens, Viral / Q000187:drug effects / Q000378:metabolism; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D001487:Basidiomycota / Q000737:chemistry*; D045744:Cell Line, Tumor; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D005260:Female; D007810:Lanosterol / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards; D051379:Mice; D008813:Mice, Inbred ICR; D008958:Models, Molecular; D008968:Molecular Conformation; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D012015:Reference Standards; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013755:Tetradecanoylphorbol Acetate / Q000737:chemistry / Q000494:pharmacology; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D023041:Xenograft Model Antitumor Assays
chemical_list: D000956:Antigens, Viral; D000970:Antineoplastic Agents; C033305:Epstein-Barr virus early antigen; D010936:Plant Extracts; D014315:Triterpenes; C517090:inonotsuoxide A; C517089:inonotsuoxide B; C517091:inotodiol; D007810:Lanosterol; D015127:9,10-Dimethyl-1,2-benzanthracene; D013755:Tetradecanoylphorbol Acetate