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- W2043159065 abstract "The present study examined the effects of a series of tricyclic muscarinic receptors antagonists on muscarinic receptorspresent in the guinea-pig ileum, both in vitro and in vivo. The selectivity profiles of these antagonists and that of atropine were determined by their for cortical muscarinic M1, cardiac M2 and submandibular M3 receptors and for m4 receptors expressed in CHO cells. The compounds pirenzepine, UH-AH 37, AQ-RA 391 and AQ-RA 618 possessed high affinity (pKi 7.94–8.22) for muscarinic M1 receptors. Pirenzepine exhibited the most pronounced muscarinic M1 selectivity. AF-DX 384 and AQ-RA 741 possessed an approximately 10-fold higher affinity for the cardiac muscarinic M2 receptor than AF-DX 116. However, both compounds also exhibited high affinity for muscarinic m4 receptors. High affinity for muscarinic M3 and m4 receptors was observed for UH-AH 37, AQ-RA 391 and AQ-RA 681. The antagonists were then tested for their interaction with the muscarinic receptors which are responsible for the methacholine-induced contraction of longitudinal muscle in vitro, circular muscle in vivo and muscarinic receptors which mediate the distension-evoked ascending reflex contraction of circular muscle in vitro. Compounds showing high affinity for muscarinic M3 receptors (e.g. AQ-RA 618) were the most potent antagonists in the functional experiments. Comparison of the binding displacement data with the functional results indicates that the effects of lethacholine on the longitudinal and circular muscle of the guinea-pig ileum were predominantly mediated by muscarinic M3-type receptors. In contrast, the correlation between muscarinic M2 receptor affinity and antagonism of muscarinic receptors in the ileum was very weak." @default.
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- W2043159065 date "1994-03-01" @default.
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- W2043159065 title "Pharmacological profile of selective muscarinic receptor antagonists on guinea-pig ileal smooth muscle" @default.
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- W2043159065 doi "https://doi.org/10.1016/0014-2999(94)90202-x" @default.
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