title: Phenotypic expression of transformation: induction in cell culture by a phorbol ester.
abstract: A biologically potent, tumor-promoting phorbol ester from Croton tiglium L. induces the appearance of transformed clones in a population of contact-inhibited fibroblasts of the mouse cell line 3T3. Mixed populations of cells with 10,000 3T3 cells and 100 virus-transformed cells were exposed to the phorbol ester and, in comparison with untreated cells, showed a marked increase in the numbers of transformed clones that grew. Exposure of 3T3 cultures to the carcinogen 7,12-dimethylbenz(a)anthracene alone or prior to exposure to the phorbol ester did not cause any increase in the number of transformed clones.
mesh_terms: D001551:Benz(a)Anthracenes / Q000494:pharmacology; D002273:Carcinogens; D002999:Clone Cells; D046508:Culture Techniques; D005347:Fibroblasts; D009374:Neoplasms, Experimental / Q000139:chemically induced*; D010946:Plants, Medicinal; D012116:Resins, Plant; D013539:Simian virus 40
chemical_list: D001551:Benz(a)Anthracenes; D002273:Carcinogens; D012116:Resins, Plant