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• W2056565740 abstract "Discrepancies between adenosine 3':5'-cyclic monophosphate (cAMP) and steroid production have been frequently observed in isolated target cells stimulated by low concentrations of trophic hormone. This dissociation is particularly marked in the interstitial cells of the testis, where testosterone production is elicited by gonadotropin concentrations in the picomolar range. Because of these observations, and a disparity between steroidogenesis and protein kinase (ATP: protein phosphotransferase, EC 2.7.1.37) activation in Leydig cells, the role of cAMP as a mediator of the acute steroidogenic response has been questioned. This problem has been further analyzed by assay of free and occupied cAMP-binding sites of the regulatory subunit of protein kinase in basal and hormone-stimulated cells. Free sites were measured by a [(3)H]-cAMP-binding assay, and occupied sites were measured by radioimmunoassay of endogenous cAMP eluted from receptor protein. After stimulation of purified Leydig cells with 0.1-10 pM human chorionic gonadotropin, a dose-dependent decrease in available [(3)H]cAMP-binding sites was observed, with no change in binding affinity. The reduction in cAMP-binding sites was equivalent to the increase in occupancy of cAMP receptors by endogenous nucleotide formed during gonadotropin action. Fractional occupancy of cAMP receptors rose progressively from basal values of 0.2-0.40 to full saturation as intracellular cAMP rose 10- to 30-fold during hormone stimulation. The testosterone dose-response curve was coincident with the initial part of the cAMP-receptor occupancy curve. These changes in endogenous cAMP binding to the regulatory subunit were accompanied by a significant increase in protein kinase activity in gonadotropin-stimulated Leydig cells. These observations provide direct evidence for the role of cAMP and protein kinase during hormonal activation of steroidogenesis in the Leydig cell by low concentrations of gonadotropin." @default.
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• W2056565740 date "1977-08-01" @default.
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• W2056565740 title "Intermediate role of adenosine 3′:5′-cyclic monophosphate and protein kinase during gonadotropin-induced steroidogenesis in testicular interstitial cells" @default.
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• W2056565740 doi "https://doi.org/10.1073/pnas.74.8.3419" @default.
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