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• W1987029331 endingPage "26" @default.
• W1987029331 startingPage "17" @default.
• W1987029331 abstract "The influence of protein kinase C (PKC) inhibitors, staurosporine, NA 0345 and H-7, on the alpha 1- and beta-adrenoceptor-mediated positive inotropic effect (PIE) was studied in rabbit ventricular myocardium. Staurosporine (1-10 nM), NA 0345 (10-100 nM) and H-7 (1-10 microM) selectively attenuated the PIE mediated by alpha 1-adrenoceptors at concentrations that did not affect the beta-mediated PIE and basal force of contraction. Staurosporine at higher concentrations (> 10 nM) decreased the basal force, while NA 0345 and H-7 did not. In membrane fractions derived from rabbit ventricular muscle, neither staurosporine, NA 0345 nor H-7 modified the specific [3H]prazosin binding at the concentrations that elicited the functional modulation. Accumulation of [3H]inositol monophosphate (IP1) induced by alpha 1-adrenoceptor stimulation was not affected by the PKC inhibitors. Phorbol 12,13-dibutyrate (PDBu), a PKC activator, also selectively attenuated the alpha 1-mediated PIE, but in association with the inhibition of the alpha 1-mediated IP1 accumulation. Staurosporine (1 nM), but not H-7, antagonized the PDBu-induced inhibitory action on the alpha 1-mediated PIE. These findings indicate that staurosporine, NA 0345 and H-7 produce a selective inhibition of the alpha 1-mediated PIE, probably through inhibition of the alpha 1-adrenoceptor-mediated activation of PKC. On the contrary, externally administered phorbol ester may act by uncoupling of alpha 1-adrenoceptors to activation of phospholipase C through a pathway different from endogenous diacylglycerol to lead to a selective inhibition of the alpha 1-mediated PIE." @default.
• W1987029331 created "2016-06-24" @default.
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• W1987029331 date "1993-01-01" @default.
• W1987029331 modified "2023-10-16" @default.
• W1987029331 title "Inotropic Effects of Staurosporine, NA 0345 and H-7, Protein Kinase C Inhibitors, on Rabbit Ventricular Myocardium: Selective Inhibition of the Positive Inotropic Effect Mediated by α1-Adrenoceptors" @default.
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• W1987029331 doi "https://doi.org/10.1254/jjp.63.17" @default.
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