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• W2136572289 abstract "Steroidogenic factor-1 (SF-1) is a transcription factor that is expressed by many cell types within the ovary and has been shown to inhibit granulosa cell proliferation. The present studies were designed to determine whether: 1) SF-1 is expressed by primary and transformed rat ovarian surface epithelial cells (i.e. ROSE cells); and 2) SF-1 expression effects the proliferation of both normal and neoplastic ROSE cells. These studies used immature, gonadotropin-primed and mature rat ovaries, as well as ROSE-179 cells from early passages (EP) and late passages (LP), T-sv-40 transformed ROSE cells, and T-ras transformed ROSE cells. In situ hybridization studies demonstrated that SF-1 was detected in the surface epithelium of rat ovaries, independent of age or gonadotropin treatment. Further, Northern blot and quantitative in situ hybridization studies revealed that significant amounts of SF-1 messenger RNA (mRNA) were present in EP-ROSE-179 cells but not in the other cell lines. Interestingly, EP-ROSE-179 cells proliferated at a significantly slower rate than the other cell lines. Further, SF-1 mRNA levels were higher in EP-ROSE-179 cells in the G0/G1 stage than in the S-, G2/M stage of the cell cycle. These observations suggest that a cause and effect relationship exists between the level of SF-1 expression and cell proliferation. To test this hypothesis, LP, T-sv-40, and T-ras ROSE cells were transfected with either control vector or SF-1 expression vector. Forty-eight hours after transfection, SF-1 expression was assessed by in situ hybridization, and the fold increase in cell number/24 h was determined. For each cell line, about 30% of the cells were successfully transfected. The fold increase in the number of cells observed after transfection with the SF-1 expression vector was significantly less than the increase in cell number after transfection with the control vector (P < 0.05). To confirm that the forced expression of SF-1 prevented proliferation, LP cells were cotransfected with a green fluorescent protein (GFP) expression vector and either control vector or SF-1 expression vector. This study demonstrated that virtually none of the GFP/SF-1-transfected cells proliferated over a 24-h period, whereas GFP/Control vector-transfected cells proliferated. Further, approximately 40% of the GFP/SF-1-transfected cells underwent apoptosis after 24 h of culture in serum-supplemented medium. These data demonstrate that: 1) normal ovarian surface epithelial cells express SF-1; 2) SF-1 is also expressed by EP-ROSE-179 cells, but its expression seems to be suppressed when the cells enter the cell cycle; 3) LP-, T-sv, and T-ras ROSE cells do not express SF-1 mRNA; and 4) the inability to express SF-1 is associated with an increase in cell proliferation. Finally, forced SF-1 expression interferes with serum-induced proliferation and leads to apoptosis." @default.
• W2136572289 created "2016-06-24" @default.
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• W2136572289 date "1998-11-01" @default.
• W2136572289 modified "2023-09-27" @default.
• W2136572289 title "Steroidogenic Factor-1 Regulates the Rate of Proliferation of Normal and Neoplastic Rat Ovarian Surface Epithelial Cellsin Vitro1" @default.
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• W2136572289 doi "https://doi.org/10.1210/endo.139.11.6312" @default.
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