Abstract
In an attempt to determine the role of protein (histone) kinases as mediators of corticotropin-induced corticosterone formation, the ability of homogenates, prepared from adrenals treated with various doses of corticotropin to catalyse the phosphorylation of calf thymus histones was measured. Although corticotropin promoted an increase in histone kinase activity, much more of the hormone was required to induce this response than to stimulate steroidogenesis maximally. In addition, a derivative, nitrophenylsulphenyl-corticotropin, which inhibits the stimulatory effect of corticotropin on cyclic AMP accumulation, stimulated corticosterone synthesis without altering histone kinase activity. Very high doses of nitrophenylsulphenyl-corticotropin were capable of stimulating histone kinase activity. In contrast, when dibutyryl cyclic AMP was used to stimulate steroidogenesis under the same conditions, any dose of the nucleotide which increased adrenal corticosteroid content also increased histone kinase activity. Assuming that histones serve as useful substrates for measurement of total adrenal protein kinase activity, the role of protein kinases as mediators of steroidogenesis is not supported by these studies.
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