title: Differential response of cultured mouse mammary cells of varying tumorigenicity to cytochalasin B.
abstract: Cultured BALB/c mouse mammary gland epithelial cells of varying oncogenic potential in vivo have been examined for their ability to multinucleate in the presence of cytochalasin B (CB). Highly tumorigenic cell lines derived from mammary tumors with hormonal, viral, or chemical carcinogen etiologies were extensively multinucleated when cultured in CB-supplemented medium. Normal mammary gland cells from either pregnant or lactating animals were predominantly mono- or binucleate under comparable conditions. At low passage levels after cloning, cell lines derived from a chemical carcinogen-induced mammary tumor were weakly oncogenic and remained largely mono-, or binucleated when cultured in CB-supplemented medium. At higher cell passage levels, both the ability to produce tumors in vivo and the degree of multinucleation in CB-supplemented medium increased dramatically with the clonal cell lines. Thus, the response of cultured mouse mammary gland epithelial cells to CB in vitro may be useful as a marker of the oncogenic potential of such cells.
mesh_terms: D000818:Animals; D002460:Cell Line; D002467:Cell Nucleus / Q000187:drug effects* / Q000473:pathology; D003571:Cytochalasin B / Q000494:pharmacology*; D005260:Female; D008325:Mammary Neoplasms, Experimental / Q000188:drug therapy* / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D009368:Neoplasm Transplantation; D014185:Transplantation, Isogeneic
chemical_list: D003571:Cytochalasin B