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- W2016019016 abstract "Cell strains and cell lines rat mammary (Rama) 350-353 have been isolated from the slowly adherent stromal fraction of enzymatically digested rat mammary glands. Primary cultures of this fraction yield fat cels on extended culture. Their proportion can be increased with horse serum or growth hormone in the medium, and this increase is associated with a 100-fold or more increase in the release of radioimmunoassayable prostaglandins of the E type (PGE). The stromal cell strains and lines that are capable of yielding fat cells also secrete elevated levels (greater than 100 ng/mg/24 hr) of PGE; the fast-sticking epithelial fraction in primary cultures and the epithelial cell lines derived from it secrete 10-100 times less. Chromatography and radioisotopic labeling of the culture media from Rama 352 cells identify the PG as PGE2. PGE2 with insulin and hydrocortisone maximally stimulates [3H]DNA synthesis of epithelial cell lines and primary cultures from normal and tumorous glands by 2-4-fold at concentrations (10-20 ng/ml) well below those released by the preadipocytic stromal cells (20-100 ng/ml). Medium exposed to most cultured cells stimulates [3H]DNA synthesis of one epithelial cell line, Rama 25, by 2-4-fold. Prevention of the synthesis of PGE2 in Rama 352 cultures with indomethacin or flurbiprofen abolishes the mitogenic activity present in the culture medium, and the PG receptor antagonist polyphloretin phosphate inhibits completely the mitogenic activity for Rama 25 cells. Myoepithelial-like cell lines normally secrete moderate levels of PGE (10-100 ng/mg/24 hr) but the mitogenic activity for Rama 25 cells released from one such line, Rama 29, is not abolished by preventing the synthesis of PG's nor by PG-receptor antagonists." @default.
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- W2016019016 date "1984-09-01" @default.
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- W2016019016 title "Rat mammary preadipocytes in culture produce a trophic agent for mammary epithelia?prostaglandin E2" @default.
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- W2016019016 doi "https://doi.org/10.1002/jcp.1041200315" @default.
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