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• W1569327355 abstract "The effect of tetradecanoylphorbol acetate (TPA) on follicle-stimulating hormone (FSH)-induced synthesis of the cholesterol side-chain cleavage (SCC) enzyme complex was studied in rat ovarian granulosa cells cultured for 48 h in serum-free medium. Cell proteins were radiolabeled with [35S]methionine, followed by immunoprecipitation of cholesterol side-chain cleavage cytochrome P-450 (P-450SCC) as well as the iron-sulfur protein adrenodoxin. Polyacrylamide gel electrophoresis and fluorography of the immunoprecipitates showed that TPA, when added in combination with FSH (50 ng/ml) or dibutyryl cAMP (Bt2cAMP; 1 mM), suppressed the stimulatory effects of these compounds on the synthesis of the SCC components in a concentration-dependent fashion. The effect of TPA was accompanied by decreased progesterone formation and decreased cAMP accumulation. The structural analog of TPA, phorbol-4 alpha-didecanoate, which does not activate protein kinase C (Ca2+/phospholipid-dependent enzyme), had no effect on the FSH- or Bt2cAMP-stimulated synthesis of SCC and progesterone or on cAMP formation. In addition to inhibiting the synthesis of these proteins, TPA greatly reduced the FSH- and Bt2cAMP-induced increase in levels of mRNA encoding the precursor form of P-450SCC. It is concluded that the effect of the phorbol ester TPA to inhibit FSH-stimulated progesterone formation in cultured ovarian granulosa cells of the rat involves decreased synthesis of the components of the SCC enzyme complex due to reduced levels of mRNA encoding the precursor forms of these proteins. The results are indicative that TPA not only inhibits FSH-mediated stimulation of cAMP formation but also may block cAMP-mediated induction of SCC synthesis. It is postulated that the effects of TPA may reflect the physiological role of protein kinase C in the regulation of ovarian steroidogenesis." @default.
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• W1569327355 date "1987-11-01" @default.
• W1569327355 modified "2023-09-30" @default.
• W1569327355 title "Tetradecanoyl phorbol acetate suppresses follicle-stimulating hormone-induced synthesis of the cholesterol side-chain cleavage enzyme complex in rat ovarian granulosa cells." @default.
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• W1569327355 doi "https://doi.org/10.1016/s0021-9258(18)48166-5" @default.
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