The affinity of some selective muscarinic receptor antagonists for the muscarinic receptor mediating endothelial-dependent relaxation of the rabbit and rat thoracic aorta

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Abstract
The pKB values determined for pirenzepine, 4-DAMP, secoverine and gallamine against acetylcholine-mediated relaxant effects in rabbit aorta indicate that this muscarinic receptor closely resembles that which mediates contraction of non-vascular smooth muscle. The results of the present study argue against the presence of a novel type of muscarinic receptor mediating endothelium-dependent relaxation.