Cepharanthine inhibits two-stage tumor promotion by 12-O-tetradecanoylphorbol 13-acetate and mezerein on skin tumor formation in mice initiated with 7,12-dimethylbenz[a]anthracene
| Autor: | Mieko Takeuchi, Michinori Akasu, Shigeki Nakagawa, Ken Yasukawa, Michio Takido |
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| Rok vydání: | 1991 |
| Předmět: |
Mezerein
Cancer Research Skin Neoplasms 9 10-Dimethyl-1 2-benzanthracene Administration Topical Administration Oral Pharmacology 12-O-Tetradecanoylphorbol-13-acetate Ornithine Decarboxylase Benzylisoquinolines Ornithine decarboxylase chemistry.chemical_compound Mice Alkaloids Cepharanthine Medicine Animals Drug Interactions Anticarcinogen Skin Immunity Cellular Mice Inbred ICR business.industry Terpenes Alkaloid 7 12-Dimethylbenz[a]anthracene General Medicine Oncology chemistry Enzyme Induction Immunology Carcinogens Tetradecanoylphorbol Acetate Tumor promotion Female Diterpenes business |
| Zdroj: | Journal of cancer research and clinical oncology. 117(5) |
| ISSN: | 0171-5216 |
| Popis: | Cepharanthine, isolated from Stephania cepharantha, is one of the bisbenzylisoquinoline-type alkaloids. We have found that it inhibits tumor promotion after topical application in two-stage carcinogenesis in mouse skin. Epidermal ornithine decarboxylase activities inhibited by topical application of cepharanthine, with an 5 micrograms/mouse) and mezerein (5 micrograms/mouse) were found to be inhibited by topical application of cepharanthine, with a ED50 of 1.2 mumol and 1.4 mumol respectively. These inhibitory effects of cepharanthine are considered to be related to its antitumor activity in two-stage carcinogenesis in mouse skin. Cell-mediated immunosuppression by TPA was unaffected by topical application of cepharanthine. A diet containing 0.005% cepharanthine (about 0.5 mg mouse-1 day-1) slightly suppressed the two-stage promotion of skin tumors by twice-weekly applications of 2.5 micrograms TPA for 2 weeks (first stage) followed by twice-weekly applications of 2.5 micrograms mezerein for 23 weeks (second stage) in ICR mice following initiation by 50 micrograms 7,12-dimethylbenz[a]anthracene. Oral administration of cepharanthine inhibits the tumor promotion in two-stage carcinogenesis in mouse skin. |
| Databáze: | OpenAIRE |
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