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• W1978438112 abstract "Agonist binding to the muscarinic receptor in rat cerebral cortex membranes was studied by using the neurotransmitter itself, [3H]acetylcholine [( 3H]AcCho). By using 10 microM atropine or oxotremorine to define specific binding, it was possible to demonstrate specific binding of [3H]AcCho that was sensitive to muscarinic but not to nicotinic ligands. Equilibrium binding experiments with 5-240 nM [3H]AcCho indicated specific binding of the ligand to a saturable population of muscarinic receptors (361 +/- 29 fmol/mg of protein; Kd = 76 +/- 17 nM). This value represented 25% of the available binding sites for a labeled antagonist in the same preparation and corresponds to the proportion of high-affinity agonist binding sites observed previously in competition experiments with labeled antagonists. Inclusion of transition metal ions (e.g., 2 mM Ni2+) in the assay increased the equilibrium binding of [3H]AcCho (628 +/- 38 fmol/mg of protein, Kd = 86 +/- 21 nM) but did not affect equilibrium binding of 3H-labeled antagonists, indicating conversion of low- into high-affinity muscarinic agonist binding sites. The increase developed slowly over 30 min of incubation at 25 degrees C but could be reversed rapidly (approximately equal to 2 min) by the chelating agent EDTA or by guanine nucleotides. These data directly reveal a slow though quickly reversible interconversion of low- into high-affinity muscarinic agonist binding sites." @default.
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• W1978438112 date "1984-06-01" @default.
• W1978438112 modified "2023-09-28" @default.
• W1978438112 title "Recognition of the muscarinic receptor by its endogenous neurotransmitter: binding of [3H]acetylcholine and its modulation by transition metal ions and guanine nucleotides." @default.
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• W1978438112 doi "https://doi.org/10.1073/pnas.81.12.3650" @default.
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