PMID: 3755499Aug 1, 1986Paper

Effects of in vivo and in vitro treatments with N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline on putative muscarinic receptor subtypes in rat brain

Molecular Pharmacology
A B Norman, I Creese

Abstract

N-Ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline (EEDQ) was found to irreversibly decrease the Bmax of [3H](-)-quinuclidinyl-benzilate [(-)QNB] binding in rat brain following in vivo administration or by incubation of tissue homogenates with EEDQ in vitro. A greater reduction in the Bmax of [3H](-)QNB binding was observed in the hippocampus and cortex than in the brainstem following in vivo or in vitro treatment with EEDQ. Competition of pirenzepine for [3H](-)QNB binding was best described by computer-derived models assuming two binding sites in all brain regions. However, following EEDQ treatment there was a rightward shift in the pirenzepine competition curves for the remaining [3H](-)QNB-binding sites in all brain regions. Computer analysis of the pirenzepine competition curves indicated that this was due to a selective decrease in the number of [3H](-)QNB-binding sites having high affinity for pirenzepine. Although the binding of [3H](-)QNB to the site having lower affinity for pirenzepine was apparently unaltered, the affinity of pirenzepine for this binding site was significantly lowered following both in vivo and in vitro treatment with EEDQ. Thus, EEDQ differentially modifies muscarinic receptor-binding sites having high...Continue Reading

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