Female rats of ten different inbred strains were tested for their suscep tibility to 7, 12-dimethylbenz|a|anthracene (DMBA)-induced mammary adenocarcinogenesis. Five of these strains (OM. NSD, \VI. LEWIS, BUFF) were demonstrated to be highly susceptible to DMBA exposure developing >2 continuously growing, macroscopically detectable mam mary adenocarcinomas/rat following gastric intubation with ...

We conducted experiments to determine if p53 alterations, which are frequent in human breast cancers, were also common in murine mammary tumors. In 13 mammary tumors from 7,12-dimethylbenz[a]anthracene (DMBA)-treated BALB/c mice were immunohistochemically analyzed for overexpression of p53; p53 protein was not detectable. Three of the tumors were established as cell lines in vitro. p53 protein ...

The aim of these studies was to investigate the effect(s) of the promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) on the evolution of different types of 7,12-dimethylbenz(a)anthracene (DMBA)-initiated rat trachéal epithelial cells in vivo. As described previously, upon exposure to carcinogens, cells appear in the trachéalepithelium which are distinguishable from the majority of the epithel...

Chemoprotection by dietary agents is a promising strategy for cancer prevention. The aim of the present study was to evaluate the combined effect of tomato and garlic against 7,12-dimethylbenz-[a]anthracene (DMBA)-induced genetic damage and oxidative stress in 12-14-week-old male Swiss albino mice. The animals were randomized into experimental and control groups and divided into eight groups of...

PURPOSE Ovarian cancer is the most lethal malignancy of the female reproductive system, and the prevention and treatment of ovarian carcinoma are still far from optimal. Epidemiological studies reported that ovarian cancer risk was inversely associated with low level of 25-hydroxy vitamin D [25(OH)]. Therefore, this study focuses on exploring the chemoprevention of vitamin D on epithelial ovari...

Epithelial cells isolated from the mammary glands of virgin Sprague-Dawley rats and treated with 7,12-dimethylbenz[a] anthracene (DMBA) acquire an indefinite life span and anchorage-independent (AI) growth and form carcinomas in athymic nu/nu mice. Epithelial cells separated from fibroblasts and lipocytes by density-gradient centrifugation after collagenase digestion of the fat pads are grown i...

Several lines of evidence suggest that stem cells are major targets for carcinogens. A normal human breast epithelial cell type was previously shown to possess stem cell characteristics. Further cell lines were derived following sequential transfection with SV40 large T-antigen (immortal, non-tumorigenic M13SV1 cells), exposure to X-rays (weakly tumorigenic M13SV1R2 cells), and ectopic expressi...

Bone marrow (BM) hematopoietic cells are selectively sensitive to polycyclic aromatic hydrocarbons (PAH) in vivo. 7,12-Dimethylbenz(a)anthracene (DMBA), but not benzo(a)pyrene (BP), depletes BM hematopoietic cells in C57BL/6 mice. This difference is due to a BP-selective aryl hydrocarbon receptor (AhR)-mediated recovery. Colony-forming unit assays show suppression of lymphoid progenitors by eac...

cDNA microarray analysis was used to examine gene expression profiles in normal female Sprague-Dawley rat mammary gland and in carcinomas induced by the cooked meat-derived carcinogen 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and the potent experimental carcinogen 7,12-dimethylbenz[a]anthracene (DMBA). Nine tubulopapillary carcinomas (five from PhIP-treated rats and four from DMBA-...

Ninety male Syrian hamsters, 3 months of age, were divided into 6 equal experimental groups of 15 animals. Two groups served as controls for 8and 16-week experimental periods. In the remaining 4 groups, the light buccal pouch was painted 3 times weekly with 9,10-dimethyl-l ,2-benzanthracene (DMBA) and sacrificed at 8 and 16 weeks. One 8-week and one 16-week experimental group were also injected...