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- W1853784753 abstract "We investigated the roles of beta(1)- and beta(2)-receptors (beta-AR) in adrenergic enhancement of L-type Ca(2+) current (I(CaL)) in canine ventricular myocytes. Isoproterenol and l-norepinephrine produced a monophasic and a biphasic concentration-I(CaL) relationship (CR), respectively. alpha(1)-AR inhibition with prazosin and beta(2)-AR stimulation with zinterol or l-epinephrine shifted the CR of l-norepinephrine leftward. Zinterol (50 nM) and l-epinephrine (10 nM), but not prazosin, altered the biphasic CR of l-norepinephrine to a monophasic CR. Zinterol and l-epinephrine applied after l-norepinephrine had no effect on I(CaL). beta(2)-AR inhibition with ICI-118551 reduced the E(max) of isoproterenol and l-norepinephrine by 60% and abolished the augmentation of l-norepinephrine by zinterol and l-epinephrine. Carbachol (100 nM) modestly reduced the I(CaL) response to beta(1)-AR stimulation but abolished the enhancement via beta(2)-AR. Zinterol augmented the enhancement of I(CaL) by forskolin, IBMX, and theophylline, but not in the presence of CGP-20712A. We conclude that selective beta(2)-AR stimulation does not increase I(CaL) but enhances adenylyl cyclase activity when stimulated via beta(1)-AR and with forskolin. beta(2)-AR activity preconditions adenylyl cyclase for beta(1)-AR stimulation." @default.
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- W1853784753 date "2000-09-01" @default.
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- W1853784753 title "Conditioning of β<sub>1</sub>-adrenoceptor effect via β<sub>2</sub>-subtype on L-type Ca<sup>2+</sup>current in canine ventricular myocytes" @default.
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- W1853784753 doi "https://doi.org/10.1152/ajpheart.2000.279.3.h1329" @default.
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