Cited by 46Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchReceptor Mechanisms and Signaling

Stimulation of dopamine release by nicotinic acetylcholine receptor ligands in rat brain slices correlates with the profile of high, but not low, sensitivity α4β2 subunit combination

Anderson, David J., Malysz, John, Grønlien, Jens Halvard, El Kouhen, Rachid, Håkerud, Monika, Wetterstrand, Caroline, Briggs, Clark A., Gopalakrishnan, Murali·2009·Biochemical Pharmacology

Abstract

alpha4beta2 neuronal nicotinic receptors (nAChRs) can exist in high and low sensitivity states possibly due to distinct stoichiometries during subunit assembly: (alpha4)(2)(beta2)(3) pentamer (high sensitivity, HS) and (alpha4)(3)(beta2)(2) pentamer (low sensitivity, LS). To determine if there is a linkage between HS or LS states and receptor-mediated responses in brain, we profiled several clinically studied alpha4beta2* nAChR agonists for the displacement of radioligand binding to alpha4beta2 [(3)H]-cytisine sites in rat brain membranes, effects on stimulation of [(3)H]-dopamine release from slices of rat prefrontal cortex and striatum, and activation of HS and LS human alpha4beta2 nAChRs expressed in Xenopus laevis oocytes. Binding affinities (pK(i)) and potency (pEC(50)) values for [(3)H]-dopamine release closely correlated with a rank order: varenicline>(-)-nicotine>AZD3480>dianicline congruent with ABT-089. Further, a good correlation was observed between [(3)H]-dopamine release and HS alpha4beta2 pEC(50) values, but not between [(3)H]-dopamine release and LS alpha4beta2. The relative efficacies of the agonists ranged from full to partial agonists. Varenicline behaved as a partial agonist in stimulating [(3)H]-dopamine release and activating both HS and LS alpha4beta2 nAChRs expressed in oocytes. Conversely, ABT-089, AZD3480 and dianicline exhibited little efficacy at LS alpha4beta2 (<5%), were more effective at HS alpha4beta2 nAChRs, and in stimulating cortical and striatal [(3)H]-dopamine release >or=30%. In the presence of alpha-conotoxin MII to block alpha6beta2* nAChRs, the alpha4beta2* alpha-conotoxin-insensitive [(3)H]-dopamine release stimulated by these ligands correlates well with their interactions at HS, but not LS. In summary, this study provides support for HS alpha4beta2* nAChR involvement in neurotransmitter release.

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Crossref · 10.1016/j.bcp.2009.06.024

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Authors
Anderson, D. J., Malysz, J., Grønlien, J. H., El Kouhen, R., Håkerud, M., Wetterstrand, C., Briggs, C. A., & Gopalakrishnan, M.
Affiliations
Abbott (United States) (US)
Corresponding author
Anderson, David J.
Venue
Biochemical Pharmacology
Publisher
Elsevier BV
Published
2009-10
Volume
78
Issue
7
Pages
844-851
ISSN
0006-2952 (ISSN-L)
OpenAlex
W2092705861
Cited by
44
References
32
Citations by year
2025: 1 · 2024: 2 · 2023: 1 · 2020: 2 · 2018: 2 · 2017: 1 · 2016: 4 · 2015: 1 · 2014: 5 · 2013: 3 · 2012: 11
FWCI
2.95
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemical Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Abbott Laboratories
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, dopamine release, varenicline, nicotine, prefrontal cortex, striatum, alpha-conotoxin MII, receptor stoichiometry, neurotransmitter release, brain slices, Xenopus oocyte expression
MeSH terms
Animals, Brain, Corpus Striatum, Dopamine, Female, Humans, Ligands, Male, Oocytes, Radioligand Assay, Receptors, Nicotinic, Xenopus laevis, Prefrontal Cortex, Patch-Clamp Techniques, Nicotinic Agonists, Nicotinic Antagonists, Conotoxins, Protein Subunits, Rats, Protein Multimerization, In Vitro Techniques

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