Cited by 148Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchReceptor Mechanisms and Signaling

The Comparative Pharmacology and Up-Regulation of Rat Neuronal Nicotinic Receptor Subtype Binding Sites Stably Expressed in Transfected Mammalian Cells

Xiao, Yingxian, Kellar, Kenneth J.·2004·The Journal of Pharmacology and Experimental Therapeutics

Abstract

We stably transfected human embryonic kidney cells (HEK 293 cells) with genes encoding rat neuronal nicotinic receptor alpha2, alpha3, or alpha4 subunits in combination with the beta2 or beta4 subunit to generate six cell lines that express defined subunit combinations that represent potential subtypes of rat neuronal nicotinic acetylcholine receptors (nAChRs). These cell lines were designated KXalpha2beta2, KXalpha2beta4, KXalpha3beta2, KXalpha3beta4, KXalpha4beta2, and KXalpha4beta4. The Kd values of [3H](+/-)epibatidine ([3H]EB) binding to membranes from these six cell lines ranged from approximately 0.02 to 0.3 nM. The pharmacological profiles of the agonist binding sites of these putative nAChR subtypes were examined in competition studies in which unlabeled nicotinic ligands, including 10 agonists and two antagonists, competed against [3H]EB. Most nicotinic ligands examined had higher affinity for the receptor subtypes containing the beta2 subunit compared with those containing the beta4 subunit. An excellent correlation (r > 0.99) of the binding affinities of the 10 agonists was observed between receptors from KXalpha4beta2 cells and from rat forebrain tissue, in which [3H]EB binding represents predominantly alpha4beta2 nAChRs. More important, the affinities (Ki values) for the two tissues were nearly identical. The densities of the binding sites of all six cell lines were increased after a 5-day exposure to (-)-nicotine or the quaternary amine agonist carbachol. These data indicate that these cell lines expressing nAChR subunit combinations should be useful models for investigating pharmacological properties and regulation of the binding sites of potential nAChR subtypes, as well as for studying the properties of nicotinic compounds.

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Crossref · 10.1124/jpet.104.066787

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  • Epibatidine is a broad-spectrum nAChR ligand that binds with very high affinity (25-300 pM) to all known heteromeric nAChRs.

    “Epibatidine is a broad-spectrum nAChR ligand that binds with very high affinity (25–300 pM) to all known heteromeric nAChRs (Avalos et al, 2002; Houghtling et al, 1995; Xiao and Kellar, 2004).”

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Authors
Xiao, Y., & Kellar, K. J.
Affiliations
Georgetown University (US)
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
2004-07
Volume
310
Issue
1
Pages
98-107
ISSN
0022-3565 (ISSN-L)
OpenAlex
W2105904453
Cited by
148
References
53
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 4 · 2022: 1 · 2021: 2 · 2020: 3 · 2019: 2 · 2018: 6 · 2017: 4 · 2016: 4 · 2015: 10 · 2014: 12 · 2013: 12 · 2012: 11
FWCI
4.14
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01da006486-10)
  • National Institute on Drug Abuse (DA-06486, DA 12976)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
Keywords
neuronal nicotinic acetylcholine receptors, nAChR subtypes, alpha2 subunit, alpha3 subunit, alpha4 subunit, beta2 subunit, beta4 subunit, epibatidine binding, carbachol, receptor subunit composition
MeSH terms
Animals, Binding Sites, Carbachol, Cell Line, Humans, Neurons, Nicotine, Pyridines, Receptors, Nicotinic, Transfection, Tritium, Up-Regulation, Gene Expression, Cholinergic Agonists, Nicotinic Agonists, Bridged Bicyclo Compounds, Heterocyclic, Rats

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