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• W2000367276 startingPage "10305" @default.
• W2000367276 abstract "Activation of the mitogen-activated protein kinase (MAP kinase) isoforms ERK1 and ERK2 was investigated in rat adipocytes. Kinase activities were measured by using myelin basic protein as substrate after the isoforms were resolved by Mono Q chromatography or by immunoprecipitation with specific antibodies. Insulin increased the activity of both isoforms by 3- to 4-fold. The beta-adrenergic agonist isoproterenol was without effect in the absence of insulin but markedly reduced the increases in ERK1 and ERK2 activities produced by the hormone. MAP kinase activation was also attenuated by forskolin and glucagon, which increase intracellular cAMP, and by dibutyryl-cAMP, 8-bromo-cAMP, and 8-(4-chlorophenylthio)-cAMP. Thus, increasing cAMP is associated with decreased activation of MAP kinase by insulin. Forskolin also inhibited activation of MAP kinase by several agents (epidermal growth factor, phorbol 12-myristate 13-acetate, and okadaic acid) that act independently of insulin receptors. Moreover, forskolin did not inhibit insulin-stimulated tyrosine phosphorylation of the insulin receptor substrate IRS-1. Therefore, the inhibitory effect on MAP kinase did not result from compromised functioning of the insulin receptor. The inhibitory effect was not confined to adipocytes, as forskolin and dibutyryl-cAMP inhibited the increase in MAP kinase activity by phorbol 12-myristate 13-acetate in wild-type CHO cells. In contrast, these agents did not inhibit MAP kinase activity in mutant CHO cells (line 10248) that express a cAMP-dependent protein kinase resistant to activation by cAMP. Our results suggest that activation of cAMP-dependent protein kinase represents a general counter-regulatory mechanism for opposing MAP kinase activation." @default.
• W2000367276 created "2016-06-24" @default.
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• W2000367276 date "1993-11-01" @default.
• W2000367276 modified "2023-10-15" @default.
• W2000367276 title "Increasing cAMP attenuates activation of mitogen-activated protein kinase." @default.
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• W2000367276 doi "https://doi.org/10.1073/pnas.90.21.10305" @default.
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