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- W2006397651 abstract "Mitochondria in follicular cells from rat ovaries were visualized in culture by indirect immunofluorescence staining of cholesterol side-chain cleavage cytochrome P-450 (P-450scc). The confinement of the immunofluorescence in the conspicuous mitochondria allowed the design of a very sensitive and quantitative assay to study the modulated expression of the cytochrome in primary cultures of granulosa cells. (1) The induction of P-450scc synthesis was totally dependent upon treatment with FSH. Up to 85% of the cells became immunofluorescently labeled in the presence of FSH, and its induced P-450scc synthesis was inhibited by cycloheximide and alpha-amanitin. The induction of FSH was dose dependent (Kmapp = 35 ng/ml) and time dependent. Prolonged incubation with FSH maintained the high levels of the cytochrome content, despite a desensitized steroidogenic response which developed after 60 h of incubation with FSH. Prolonged FSH treatment also resulted in morphological changes in the induced mitochondria, which became fragmented and globular. (2) Inoculum densities, probably by altering cell shape, substantially affected the extent of P-450scc induction; this was suppressed (80%) at lower culture densities. (3) The immunofluorescent staining also revealed various degrees of cellular competence to express P-450scc. Within a single induced cell, all mitochondria emitted a similar fluorescent signal, but the degree of fluorescence per mitochondrion varied with different cells. The cell-specific information gained by the immunofluorescent technique also allowed the detection of ovarian interstitial cells that slightly contaminate the granulosa cell preparations. Unlike granulosa cells, interstitial cells express and maintain high levels of P-450scc without the need for hormonal induction." @default.
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- W2006397651 date "1986-12-01" @default.
- W2006397651 modified "2023-10-16" @default.
- W2006397651 title "Immunofluorescent Probing of the Mitochondrial Cholesterol Side-Chain Cleavage Cytochrome P-450 Expressed in Differentiating Granulosa Cells in Culture*" @default.
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- W2006397651 doi "https://doi.org/10.1210/endo-119-6-2821" @default.
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