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- W2115789601 abstract "The effects of muscarinic and α-adrenergic receptor stimulation on phosphoinositide turnover in rat atria have been compared. Despite the similar densities of muscarinic receptors in rat left and right atria, 0.1 mM carbachol increased [32P]phosphate incorporation into phosphatidylinositol (PI) by 35% (p<0.05) in left atria but had no effect in right atria. By contrast to the small muscarinic receptor effect, stimulation of α1-adrenergic receptors by 0.1 mM methoxamine produced a more than two fold increase in [32P]phosphate incorporation into PI in both left and right atria, despite the reported smaller density of α-adrenergic receptors in rat atria compared to muscarinic receptors. Enhanced phosphate labelling by methoxamine did not occur in phospholipids other than PI, and was blocked by the α-adrenergic antagonist, phentolamine (20 μM). The results indicate that the majority of the muscarinic receptors in rat atria are not coupled to phosphoinositide turnover. If indeed the observed enhancement in [32P]phosphate labelling by carbachol reflects phosphoinositide turnover, and assuming equal coupling efficiencies of muscarinic and adrenergic receptors, it is calculated that not more than 2% of the muscarinic receptors in rat left atria are coupled to this response." @default.
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- W2115789601 date "1984-10-01" @default.
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- W2115789601 title "Comparison of muscarinic and α-adrenergic receptors in rat atria based on phosphoinositide turnover" @default.
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- W2115789601 doi "https://doi.org/10.1016/0024-3205(84)90171-1" @default.
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