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- W2020128636 abstract "Both adrenocorticotrophic hormone (ACTH) and cyclic AMP rapidly stimulate corticosterone synthesis in isolated adrenal cells prepared by collagenase disaggregation of decapsulated rat glands. This steroidogenic response is not accompanied by any acute increase in the incorporation of [3H]uridine into acid insoluble RNA; indeed a slight decrease is observed during the incubations. A wide variety of different effects of actinomycin D on adrenal steroidogenesis have previously been reported. The effects of a range of actinomycin D concentrations (1–50 μmol/l) on the steroidogenesis brought about by different concentrations of ACTH (0.1–100. mi.u./ml) and cyclic AMP (1–5 mmol/l) were therefore examined. Actinomycin D (1 μmol/l) inhibits overall RNA synthesis by over 91% but has little or no effect on the cellular response to low concentrations of ACTH, although both basal (non-stimulated) corticosterone output and cyclic AMP stimulated steroidogenesis are appreciably inhibited (by 29–54%). Even at very high doses of actinomycin D (50 μmol/l), which inhibit RNA synthesis by 96% a substantial steroidogenic stimulation is obvious at all concentrations of ACTH and cyclic AMP studied. There is a greater inhibition of stimulated steroidogenesis not only with increasing actinomycin D concentrations, but also with increasing time of cellular exposure to actinomycin D. It is concluded that the acute steroidogenic ACTH mechanism does not require newly synthesized RNA and that if the inhibition by actinomycin D is simply due to an effect on synthesis of various RNA species, then the shortest estimate of the half-life of any RNA involved is 70 min." @default.
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- W2020128636 date "1974-03-01" @default.
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- W2020128636 title "Corticosteroid and ribonucleic acid synthesis in isolated adrenal cells: Inhibition by actinomycin D" @default.
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