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• W1965016630 abstract "Abstract Total protein kinase activity and the expression of the type I and type II cyclic adenosine 3′:5′-monophosphate-dependent protein kinases were studied in subcellular fractions of rat thymocytes and the effect of concanavalin A treatment on protein kinase activity was assessed. At a concentration of 100 μ/ml of concanavalin A a marked decline of total nuclear protein kinase activity occurred which lasted approximately 20 to 90 min. Concomitantly, a twofold increase of total protein kinase activity in the 900 g supernatant fraction was observed which lasted from 5 to 30 min. Studies using the heat-stable protein kinase inhibitor revealed that the concanavalin A-mediated activity changes were primarily due to changes of cAMP-dependent protein kinase activity, whereas cAMP-independent protein kinase activity remained unchanged. Analysis of the type I and type II cAMP-dependent protein kinase isozyme pattern before and after concanavalin A treatment revealed a selective change of the relative expression of isozyme activities. Whereas type I protein kinase was the major nuclear isozyme before concanavalin A treatment, nuclear type II cAMP-dependent protein kinase increased markedly with a concomitant loss of type I isozyme expression. In the 900 g supernatant fraction, containing primarily the type II isozyme in unstimulated cells, concanavalin A treatment caused an increase of the expression of the type I isozyme. The concanavalin A-mediated relative changes of cAMP-dependent protein kinase isozyme expression were confirmed by photoaffinity labeling of the regulatory subunits R I and R II before and after concanavalin A stimulation. The intracellular concanavalin A-mediated isozyme changes were time dependent, exhibiting maximal effects about 20 min after concanavalin A addition. These results indicate that selective regulation of intracellular cAMP-dependent protein kinase isozyme expression may be a mechanism related to isozyme-specific phosphorylation of specific intracellular substrates in concanavalin A-activated thymocytes." @default.
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• W1965016630 date "1982-01-01" @default.
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• W1965016630 title "Selective expression of type I and type II cyclic AMP-dependent protein kinases in subcellular fractions of concanavalin A-stimulated rat thymocytes" @default.
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• W1965016630 doi "https://doi.org/10.1016/0003-9861(82)90447-7" @default.
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