title: Tumor promoting activity of teleocidin in skin and forestomach of mice initiated transplacentally with 7,12-dimethylbenz(a)anthracene.
abstract: Experiments on the effect of transplacental initiation with 7,12-dimethylbenz(a)anthracene (DMBA) and postnatal promotion with teleocidin were carried out in mice. The percentage of tumor-bearing mice among females treated with DMBA transplacentally on day 17 of gestation and postnatally by topical application of teleocidin to the skin of the back was 73.3% in week 30, whereas that among females treated with DMBA on day 10 of gestation and postnatally by topical application of teleocidin was 20.0%. This indicates that teleocidin shows potent tumor promoting activity on mouse skin in a transplacental initiation and postnatal promotion protocol. Furthermore, in the males treated with DMBA transplacentally on day 17 of gestation and given diet containing 0.01% teleocidin postnatally five tumors of the forestomach were found in 5 of 19 effective mice (26.3%) in week 52. One of these five tumors was a squamous cell carcinoma, and the others were papillomas. This indicates that teleocidin also has tumor promoting activity in the forestomach of mice.
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene; D000818:Animals; D002273:Carcinogens; D005260:Female; D008235:Lyngbya Toxins; D008431:Maternal-Fetal Exchange; D051379:Mice; D011247:Pregnancy; D012878:Skin Neoplasms / Q000139:chemically induced*; D013274:Stomach Neoplasms / Q000139:chemically induced*
chemical_list: D002273:Carcinogens; D008235:Lyngbya Toxins; C022176:teleocidins; D015127:9,10-Dimethyl-1,2-benzanthracene