Cited by 181Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchReceptor Mechanisms and Signaling

Stable expression, pharmacologic properties and regulation of the human neuronal nicotinic acetylcholine alpha 4 beta 2 receptor.

Gopalakrishnan, M, Monteggia, L M, Anderson, D J, Molinari, E J, Piattoni-Kaplan, M, Donnelly-Roberts, D, Arneric, S P, Sullivan, J P·1996·The Journal of Pharmacology and Experimental Therapeutics

Abstract

(-)-Nicotine, the prototypical agonist for neuronal nicotinic acetylcholine receptors (nAChR) has been shown to bind with high affinity to the rodent and avian alpha 4 beta 2 nAChR subtype. This subtype may represent a primary molecular target for some of the beneficial central nervous system effects i.e., cognitive enhancement, anxiolysis, analgesia, neuroprotection, of (-)-nicotine and related ligands. However, a detailed study of the human alpha 4 beta 2 subunit combination has not yet been reported. In this study, we stably coexpressed the human neuronal alpha 4 and beta 2 nAChR subunits in human embryonic kidney (HEK) 293 cells and studied its pharmacological and regulatory properties. [3H]Cytisine bound to stably transfected cells with high affinity (KD value, 0.2 +/- 0.04 nM) and with a Bmax value of 1359 +/- 91 fmol/mg protein. A good correlation (r = 0.98) was observed between binding affinities in transfected cells and in native neuronal preparations for a series of nAChR ligands. 86Rb+ efflux studies showed that stably transfected cells express functional ion channels that are sensitive to blockade by dihydro-beta-erythroidine. (+/-)-Epibatidine, (-)-nicotine, 1,1-dimethyl-4-phenylpiperazinium, (S)-3-methyl-5-(1-methyl-2-pyrrolidinyl)isoxazole (ABT-418), acetylcholine and (-)-cytisine stimulated 86Rb+ efflux with EC50 values of 0.02, 3.9, 2.5, 10, 44 and 38 microM, respectively. Treatment of transfected cells with (-)-nicotine for 7 days led to a significant increase in the density of [3H](-)-cytisine binding sites (EC50 = 0.56 microM) and a significant enhancement in the sensitivity of ACh. Specific binding or (-)-nicotine-evoked cation efflux was not detected in untransfected cells. Analysis of total cellular RNA from transfected, but not untransfected cells, showed the expected fragment sizes corresponding to the human alpha 4 and beta 2 subunit mRNA. These results demonstrate that stable expression of the human alpha 4 beta 2 nAChR subunit combination can give rise to functional ion channels that bind [3H](-)-cytisine with high affinity, exhibit homologous regulation and evoke agonist-induced cation flux with pharmacological properties consistent with native neuronal alpha 4 beta 2 nAChR.

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Crossref · 10.1016/s0022-3565(25)12264-7

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Authors
Gopalakrishnan, M., Monteggia, L. M., Anderson, D. J., Molinari, E. J., Piattoni-Kaplan, M., Donnelly-Roberts, D., Arneric, S. P., & Sullivan, J. P.
Affiliations
Abbott (United States) (US)
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
1996-01
Volume
276
Issue
1
Pages
289-297
ISSN
0022-3565 (ISSN-L)
OpenAlex
W2238918217
Cited by
178
References
0
Citations by year
2024: 1 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 2 · 2017: 4 · 2016: 6 · 2015: 2 · 2014: 2 · 2013: 7 · 2012: 3
FWCI
6.18
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed
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, alpha4beta2 nAChR, nicotine, 86Rb efflux, ion channel function, receptor desensitization, receptor resensitization, receptor internalization, receptor trafficking
MeSH terms
Quinolizidine Alkaloids, Alkaloids, Animals, Azocines, Base Sequence, Cells, Cultured, Humans, Kidney, Kinetics, Male, Molecular Sequence Data, Neurons, Nicotine, Quinolizines, Receptors, Nicotinic, RNA, Messenger, Stereoisomerism, Transfection, Tritium, Up-Regulation, Rats, Sprague-Dawley, DNA, Complementary, Nicotinic Agonists, Rats

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