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• W2054742015 abstract "Catecholamines modulate cardiac function at least in part through alpha(1)-adrenergic receptors linked to the activation of protein kinase C (PKC). This study examines the molecular forms of the alpha(1)-receptor and PKC that mediate norepinephrine's actions in cardiomyocytes; distinct approaches (activation-dependent down-regulation of PKC isoforms) and novel reagents (A61603, an alpha(1A/c)-receptor agonist) are used to resolve this issue which has been the focus of dispute in previous studies. Norepinephrine (NE) induces a rise in diacylglycerol levels which is sustained for 24 h and is associated with the translocation (at 5 min) and down-regulation (at 24 h) of PKC delta and PKC xi (but not PKC alpha). The selective targeting of the alpha(1)-adrenergic receptor to activate novel PKC isoforms is remarkable, given an 8-fold greater abundance of PKC alpha relative to PKC xi in this preparation. NE activates the extracellular signal-regulated protein kinase (ERK) subfamily of mitogen-activated protein kinases through a PKC delta/PKC xi -dependent pathway. WB-4101 (alpha(1A/c)- and alpha(1D)-receptor antagonist) and 5-methylurapidil (alpha(1A/c)-receptor antagonist) inhibit norepinephrine-dependent accumulation of inositol phosphate and diacylglycerol, down-regulation of PKC delta and PKC xi, and activation of ERK. Each of these responses is stimulated by A61603, but not attenuated by high concentrations of chloroethylclonidine (which irreversibly inactivates the alpha(1B)-, and to a lesser extent, the alpha(1D)-receptor) or BMY 7378 (selective alpha(1D)-receptor antagonist). A61603 also activates p38-MAPK and induces hypertrophy. These studies establish that NE's actions in cardiomyocytes can be attributed to the alpha(1A/c)-adrenergic receptor subtype and nPKC isoforms, thereby identifying specific targets for the development of pharmaceuticals to influence cardiac contractile function and/or growth responses." @default.
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• W2054742015 date "2000-07-01" @default.
• W2054742015 modified "2023-10-15" @default.
• W2054742015 title "The α1-Adrenoceptor Subtype- and Protein Kinase C Isoform-dependence of Norepinephrine's Actions in Cardiomyocytes" @default.
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• W2054742015 doi "https://doi.org/10.1006/jmcc.2000.1153" @default.
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