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<a href="http://doi.org/10.1046/j.1365-2680.2001.00214.x" target="_blank" rel="noreferrer noopener">http://doi.org/10.1046/j.1365-2680.2001.00214.x</a>
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Pages
101-112
Issue
2
Volume
21
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Title
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Changes of the responses of single sympathetic ganglionic neurones to substance P following desensitization
Publisher
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Journal of Autonomic Pharmacology
Date
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2001
2001-04
Subject
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adenylate-cyclase; binding; cells; desensitization; G protein; inhibition; k+ current; kinase-c; M current; muscarine; Neurosciences & Neurology; Pharmacology & Pharmacy; phosphorylation; protein alpha-subunits; receptor; rgs proteins; Substance P
Creator
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Simmons M A
Description
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1 The neuropeptide substance P (SP) exerts an excitatory effect on sympathetic neurones by inhibiting a time- and voltage-dependent potassium current. During prolonged application of SP, the response desensitizes. The changes in kinetics of the SP response in single neurones after desensitization have been studied in an attempt to gain some insight as to the molecular mechanism of desensitization in live, functioning neurones. 2 Desensitization to SP resulted in subsequent SP responses being smaller, but the time course was unchanged in desensitized cells compared with non-desensitized cells. 3 Experimental manipulations were performed to decrease receptor and G protein function for comparison to desensitization. Intracellular application of GDP betaS, to decrease G protein function, led to successive responses to agonist becoming smaller and slower. When functional muscarinic receptors were decreased by extracellular application of propylbenzilylcholine mustard (PrBCM), the response to muscarine became smaller, but the time course was unchanged compared with the change in time course produced by PrBCM vehicle alone. 4 The results have also been compared with simulations from a mathematical model of drug-receptor-G protein interactions. Under a constrained set of conditions, the model predicts that decreasing the size of the G protein pool will decrease both the magnitude and the time course of the response to agonist. Decreasing receptor levels results in a more efficient decrease in the magnitude of the response but no change in the time course of the response. 5 These data provide evidence that desensitization of the response to SP in single neurones results from a decrease in functional receptors.
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<a href="http://doi.org/10.1046/j.1365-2680.2001.00214.x" target="_blank" rel="noreferrer noopener">10.1046/j.1365-2680.2001.00214.x</a>
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Journal Article
2001
adenylate-cyclase
Binding
Cells
Desensitization
G protein
inhibition
Journal Article
Journal of Autonomic Pharmacology
k+ current
kinase-c
M current
muscarine
Neurosciences & Neurology
Pharmacology & Pharmacy
Phosphorylation
protein alpha-subunits
Receptor
rgs proteins
Simmons M A
SUBSTANCE P