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- W2069708763 abstract "GTPase activity has been measured in synaptic membranes from bovine retina, with and without muscarinic receptor stimulation. Maximal stimulation above basal levels was achieved with 5 microM oxotremorine and 100 microM carbachol. (4-Hydroxy-2-butynyl)-1-trimethylammonium m-chlorocarbanilate chloride, which is selective for the M1 muscarinic receptor, failed to stimulate GTPase activity. 4-Diphenylacetoxy-N-methylpiperidine methiodide (4-DAMP) inhibition of oxotremorine stimulation demonstrated the presence of two populations of receptors, a low-affinity site (IC50 +/- SEM, 0.63 +/- 0.18 microM) which accounted for 63% of the inhibition and a high-affinity site (IC50 less than 1 nM) which accounted for the remaining 37%. When carbachol-stimulated GTPase activity was assayed, a single 4-DAMP inhibitory site was apparent (IC50 +/- SEM, 2.0 +/- 0.9 microM). Pirenzepine inhibited GTPase activity at a single site (IC50 values +/- SEM, 46.9 +/- 11 and 25.4 +/- 6.5 microM against oxotremorine and carbachol, respectively). Methoctramine was equipotent against carbachol and oxotremorine stimulation (IC50 values, 4.2 +/- 1.8 and 6.2 +/- 1.5 microM). Inhibition of maximal carbachol and oxotremorine stimulation by muscarinic antagonists at the major site had a rank order of potency of 4-DAMP = methoctramine greater than pirenzepine. Thus, the major site for muscarinic stimulation of GTPase activity in bovine retinal membranes is pharmacologically similar to M2 receptors." @default.
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- W2069708763 date "1992-07-01" @default.
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- W2069708763 title "Muscarinic Receptor Stimulated GTPase Activity in Synaptic Membranes from Bovine Retina" @default.
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- W2069708763 doi "https://doi.org/10.1111/j.1471-4159.1992.tb08893.x" @default.
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