The intact human neuroblastoma cell (SH-SY5Y) exhibits high-affinity [3H]pirenzepine binding associated with hydrolysis of phosphatidylinositols

M. Serra, L. Mei, William R Roeske, G. K. Lui, M. Watson, H. I. Yamamura

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Abstract

The binding of [3H]pirenzepine to a human neuroblastoma cell line (SH-SY5Y) and its correlation with hydrolysis of phosphatidylinositols were characterized. Specific [3H]pirenzepine binding to intact cells was repid, reversible, saturable, and of high affinity. Kinetic studies yielded association (K+1) and dissociation (k-1) rate constants of 5.2 ± 1.4 x 106 M-1 min-1 and 1.1 ± 0.06 x 10-1 min-1, respectively. Saturation experiments revealed a single class binding sites (n(H) = 1.1) for the radioligand with a total binding capacity of 160 ± 33 fmol/mg protein and an apparent dissociation constant of 13 nM. The specific [3H]pirenzepine binding was inhibited by the presence of selected muscarinic drugs. The order of antagonist potency was atropine sulfate > pirenzepine > AF-DX 116, with K(0.5) of 0.53 nM, 2.2 nM, and 190 nM, respectively. The binding properties of [3H](-)-quinuclidinyl benzilate and its quaternary derivative [3H](-)-methylquinuclidinyl benzilate were also investigated. The muscarinic agonist carbachol stimulated formation of inositol phosphates which could be inhibited by muscarinic antagonists. The inhibition constants of pirenzepine and AF-DX 116 were 11 nM and 190 nM, respectively. In conclusion, we show that the nonclassical muscarinic receptor antagonist [3H]pirenzepine identifies a high-affinity population of muscarinic sites which a associated with hydrolysis of phosphatidylinositols in this human neuroblastoma cell line.

Original languageEnglish (US)
Pages (from-to)1513-1521
Number of pages9
JournalJournal of Neurochemistry
Volume50
Issue number5
StatePublished - 1988

Fingerprint

Pirenzepine
Phosphatidylinositols
Neuroblastoma
Hydrolysis
Muscarinic Antagonists
Cholinergic Agents
Benzilates
Cells
Quinuclidinyl Benzilate
Cell Line
Muscarinic Agonists
Inositol Phosphates
Carbachol
Muscarinic Receptors
Atropine
Rate constants
Binding Sites
Association reactions
Derivatives
Kinetics

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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The intact human neuroblastoma cell (SH-SY5Y) exhibits high-affinity [3H]pirenzepine binding associated with hydrolysis of phosphatidylinositols. / Serra, M.; Mei, L.; Roeske, William R; Lui, G. K.; Watson, M.; Yamamura, H. I.

In: Journal of Neurochemistry, Vol. 50, No. 5, 1988, p. 1513-1521.

Research output: Contribution to journalArticle

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abstract = "The binding of [3H]pirenzepine to a human neuroblastoma cell line (SH-SY5Y) and its correlation with hydrolysis of phosphatidylinositols were characterized. Specific [3H]pirenzepine binding to intact cells was repid, reversible, saturable, and of high affinity. Kinetic studies yielded association (K+1) and dissociation (k-1) rate constants of 5.2 ± 1.4 x 106 M-1 min-1 and 1.1 ± 0.06 x 10-1 min-1, respectively. Saturation experiments revealed a single class binding sites (n(H) = 1.1) for the radioligand with a total binding capacity of 160 ± 33 fmol/mg protein and an apparent dissociation constant of 13 nM. The specific [3H]pirenzepine binding was inhibited by the presence of selected muscarinic drugs. The order of antagonist potency was atropine sulfate > pirenzepine > AF-DX 116, with K(0.5) of 0.53 nM, 2.2 nM, and 190 nM, respectively. The binding properties of [3H](-)-quinuclidinyl benzilate and its quaternary derivative [3H](-)-methylquinuclidinyl benzilate were also investigated. The muscarinic agonist carbachol stimulated formation of inositol phosphates which could be inhibited by muscarinic antagonists. The inhibition constants of pirenzepine and AF-DX 116 were 11 nM and 190 nM, respectively. In conclusion, we show that the nonclassical muscarinic receptor antagonist [3H]pirenzepine identifies a high-affinity population of muscarinic sites which a associated with hydrolysis of phosphatidylinositols in this human neuroblastoma cell line.",
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