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Normal endometrial luminal epithelial cells isolated from ovariectomized approximately 40-day-old BALB/cCrgl mice were purified by Percoll density gradient centrifugation and grown as primary cultures in collagen gel matrix and serum-free medium. Cells increased threefold in number during the 9-day culture period. Deletion of insulin, epidermal growth factor or bovine serum albumin resulted in decreased growth. Addition of any single factor to the unsupplemented medium had no effect. Relatively high levels of cytosolic oestrogen receptors and progestin receptors were demonstrable in the cultures. Addition of oestrogen did not enhance epithelial cell proliferation. On the contrary, all doses of oestrogen (180 fmol/l to 218 nmol/l) were inhibitory. Continuous exposure to oestradiol-17β (1·8 nmol/l) for 9 days in serum-free medium resulted in a decrease in cytosolic oestrogen receptors with an associated nuclear accumulation of oestrogen receptors. A corresponding increase in cytosolic progestin receptors was also observed, indicating that no qualitative modification of the oestrogen receptor system had occurred. Thus, as previously reported for vaginal epithelial cells, oestrogen, despite its stimulation of specific product synthesis (progestin receptors), did not increase proliferation of endometrial luminal epithelial cells in this culture system.

Journal of Endocrinology (1991) 128, 115–120

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