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• W2069854818 startingPage "199" @default.
• W2069854818 abstract "Neurotensin (NT) is a tridecapeptide distributed in central and peripheral nervous systems, which can behave as a neurotransmitter or neuromodulator at central and peripheral levels. Herein we tested the potential effect of this peptide on quinuclidinyl benzilate ([3H]-QNB) binding to muscarinic receptor in rat CNS membranes. It was observed that NT decreased up to 50–70% ligand binding at 1 × 10−7 M–1 × 10−5 M concentration in cerebral cortex, cerebellum and striatum. In the hippocampus, NT exerted a biphasic effect, behaving as a stimulator in the presence of 1 × 10−12 M–1 × 10−10 M concentration but as an inhibitor at 1 × 10−8 M–1 × 10−5 M concentration. In order to test the involvement of high-affinity NT receptor (NTS1) in NT inhibitory effect, assays were carried out in the presence of 1 × 10−6 M NT and/or SR 48692 (Sanofi-Aventis, U.S., Inc.), a specific antagonist for this receptor, dissolved in dimethylsulfoxide (DMSO) 10% v/v. As controls, membranes incubated with DMSO and/or NT 1 × 10−6 M plus DMSO were processed. It was found that NT + DMSO decreased [3H]-QNB binding to cerebral cortex, cerebellum and hippocampal membranes by 49%, 32% and 53%, respectively. This inhibition was not observed with the DMSO control group. Membrane preincubation with 1 × 10−6 M SR 48692 failed to alter NT effect on binding. SR 48692 at 1 × 10−6 M concentration decreased the binding by 50% only in cerebral cortex membranes, suggesting a possible direct effect of the antagonist on muscarinic receptors in this area. It was therefore concluded that the high-affinity NT receptor may not be involved in ligand binding inhibition to muscarinic receptor by NT." @default.
• W2069854818 created "2016-06-24" @default.
• W2069854818 creator A5011978095 @default.
• W2069854818 creator A5049434103 @default.
• W2069854818 date "1991-07-01" @default.
• W2069854818 modified "2023-10-17" @default.
• W2069854818 title "Allosteric antagonists of the muscarinic acetylcholine receptor" @default.
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• W2069854818 doi "https://doi.org/10.1016/0006-2952(91)90703-8" @default.
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