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• W2282149879 startingPage "H1807" @default.
• W2282149879 abstract "It has been suggested that there is a preferential coupling in heart muscle between the inhibitory G protein (G(i)) and the beta(2)-subtype of the beta-adrenergic receptor (beta-AR), since pertussis toxin (which inactivates G(i)) reveals latent beta(2)-ARs in rat and mouse myocytes. We have previously shown that guinea pigs treated with norepinephrine (NE) for 7 days have myocytes that are desensitized to beta-AR-agonist stimulation, and that pertussis toxin restores these responses. The purpose of the present investigation was to determine whether pertussis toxin specifically upregulated beta(2)-ARs in myocytes from NE-treated guinea pigs. The sole beta-AR subtype in control guinea pig myocytes was confirmed as beta(1)-AR by radioligand binding, single-cell autoradiography, and concentration-response curves to isoproterenol in contracting myocytes. In contrast, a minor pool of beta(2)-ARs was observed in rat myocytes by use of the same methods. NE treatment decreased the maximum isoproterenol response (relative to high Ca(2+)) from 0.89 +/- 0.06 to 0.58 +/- 0.08 (n = 7, P < 0.01) and the pD(2) (-log EC(50)) from 8.8 +/- 0.2 to 7.5 +/- 0.2 (n = 7, P < 0.01). Pertussis toxin treatment increased the isoproterenol-to-Ca(2+) ratio to 0.88 +/- 0.04 (n = 6, P < 0.05) and the pD(2) to 8.6 +/- 0.3 (P < 0.01). This was not mediated by increases in either number or function of beta(2)-ARs. G(i) is therefore able to modulate beta(1)-AR responses in guinea pig myocytes." @default.
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• W2282149879 date "2000-06-01" @default.
• W2282149879 modified "2023-10-11" @default.
• W2282149879 title "G_i-dependent suppression of β₁-adrenoceptor effects in ventricular myocytes from NE-treated guinea pigs" @default.
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• W2282149879 doi "https://doi.org/10.1152/ajpheart.2000.278.6.h1807" @default.
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