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Biology of Reproduction, Vol 33, 247-258, Copyright © 1985 by Society for the Study of Reproduction

ARTICLES

Growth effects of protein hormones on cultured rabbit ovarian surface epithelial cells

HO Osterholzer, EJ Streibel and SV Nicosia

Throughout life, the ovarian surface epithelium (OSE) undergoes morphogenetic changes that may be hormonally regulated. To investigate this possibility, a population of cells morphologically identical to native OSE cells was isolated from estrous rabbits with collagenase, unit gravity sedimentation, and trypsin-EDTA. Cells were incubated with various concentrations of protein hormones in serum-rich medium or in a chemically defined medium containing fibronectin. Tritiated thymidine was added 24 h before interruption of cultures. Growth-promoting effects of tested hormones were more pronounced and consistent in serum- free cultures. Under these conditions, human chorionic gonadotropin (10,000 mIU/ml) caused a 2.8-fold increase in cell number and a 3.4- fold stimulation of thymidine incorporation. Luteinizing hormone (NIAMDD-oLH-24, 1.0 micrograms/ml) and follicle-stimulating hormone (NIADDK-oFSH-16, 1.0 micrograms/ml) produced, respectively, a 1.7-fold and 1.5-fold increase in cell proliferation, and over 1.4-fold and 1.3- fold stimulations of thymidine uptake. When used together, no growth stimulation by these gonadotropins was seen. Slight but significant increases in cell number (1.4-fold) and in radiolabel incorporation (1.3-fold) were observed with prolactin (NIADDK-oPrl-16, 10 ng/ml). These data indicate that some protein hormones promote the growth of OSE cells. This property may be important in regulating these cells during normal and pathologic states.


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