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• W2133238051 abstract "Mammary epithelial cells from 4-month-old virgin BALB/c mice were cultured inside collagen gels in the following serum-free media: Dulbecco's modified Eagle's medium:Hams's F-12 (1:1) supplemented with: insulin (10 micrograms/ml), bovine serum albumin (5 mg/ml), and epidermal growth factor (5 ng/ml); insulin, bovine serum albumin, progesterone (0.05 microgram/ml), and prolactin (1 microgram/ml); insulin, bovine serum albumin, progesterone, prolactin, and linoleic acid (10 micrograms/ml). Cells proliferated in all these media. The cells were treated with 0.01 micrograms/ml of 7,12-dimethylbenz(a)anthracene or 100 micrograms/ml of N-nitroso-N-methylurea on day 3 of culture and, subsequently, at 1-week intervals for 3-6 weeks. Tetradecanoylphorbol acetate (0.1 micrograms/ml) was added to selected cultures. The cultures were maintained for up to 9 weeks; the cells were then removed from the collagen gels, placed in monolayer culture for 2 days, and removed from monolayer culture, and 5 X 10(5) cells were transplanted to each of the gland-free mammary fat pads of 3-week-old female mice. Approximately 10 weeks after transplantation, the transplanted mammary fat pads were examined for outgrowths. Cells that were not treated with carcinogen and cultured for up to 9 weeks in different serum-free media and transplanted to the gland-free mammary fat pad produced only ductal outgrowths similar in morphology to the ducts of the virgin host's mammary glands. Six treatments with 7,12-dimethylbenz(a)anthracene, of cells grown in the presence of epidermal growth factor, induced 31% spindle cell tumors, 17% ductal hyperplasias, and 5% lobuloalveolar hyperplasias. Cells that were grown in epidermal growth factor and treated three times with N-nitroso-N-methylurea produced 23% ductal hyperplasias and 17% lobuloalveolar hyperplasias. Cells grown in the presence of progesterone and prolactin and treated three times with 7,12-dimethylbenz(a)anthracene produced up to 23% lobuloalveolar hyperplasias and 12% ductal hyperplasias. Three treatments with N-nitroso-N-methylurea of cells grown in progesterone- and prolactin-containing media produced a maximum of 50% lobuloalveolar hyperplasias and 33% ductal hyperplasias. The lobuloalveolar hyperplasias have the characteristics of the precancerous hyperplastic alveolar nodules found in mouse mammary tumorigenesis. The in vitro carcinogen-induced lobuloalveolar hyperplasias were transplantable, maintained their lobuloalveolar morphology in virgin hosts, and produced carcinomas." @default.
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• W2133238051 date "1987-01-01" @default.
• W2133238051 modified "2023-09-23" @default.
• W2133238051 title "In vitro transformation of mouse mammary epithelial cells grown serum-free inside collagen gels." @default.
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