In old rats in contrast to young and mature ones the treatment of synaptic membranes with SH-reagent N-ethylmaleimide, cholinergic agonist carbamylcholine or both of them decreases the specific binding of labeled muscarinic antagonist 3H-quinuclidinylbenzylate. The age related change of receptor conformation with exposure of thiol groups responsible for antagonist binding is suggested.
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