Cited by 70Nicotinic Acetylcholine Receptors StudySmoking Behavior and CessationNeuroscience and Neuropharmacology Research

Increased nicotinic acetylcholine receptor protein underlies chronic nicotine-induced up-regulation of nicotinic agonist binding sites in mouse brain

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Marks, Michael J., McClure-Begley, Tristan D., Whiteaker, Paul, Salminen, Outi, Brown, Robert W.B., Cooper, John, Collins, Allan C., Lindstrom, Jon M.·2011·The Journal of Pharmacology and Experimental Therapeutics

Abstract

Chronic nicotine treatment elicits a brain region-selective increase in the number of high-affinity agonist binding sites, a phenomenon termed up-regulation. Nicotine-induced up-regulation of α4β2-nicotinic acetylcholine receptors (nAChRs) in cell cultures results from increased assembly and/or decreased degradation of nAChRs, leading to increased nAChR protein levels. To evaluate whether the increased binding in mouse brain results from an increase in nAChR subunit proteins, C57BL/6 mice were treated with nicotine by chronic intravenous infusion. Tissue sections were prepared, and binding of [(125)I]3-((2S)-azetidinylmethoxy)-5-iodo-pyridine (A85380) to β2*-nAChR sites, [(125)I]monoclonal antibody (mAb) 299 to α4 nAChR subunits, and [(125)I]mAb 270 to β2 nAChR subunits was determined by quantitative autoradiography. Chronic nicotine treatment dose-dependently increased binding of all three ligands. In regions that express α4β2-nAChR almost exclusively, binding of all three ligands increased coordinately. However, in brain regions containing significant β2*-nAChR without α4 subunits, relatively less increase in mAb 270 binding to β2 subunits was observed. Signal intensity measured with the mAbs was lower than that with [(125)I]A85380, perhaps because the small ligand penetrated deeply into the sections, whereas the much larger mAbs encountered permeability barriers. Immunoprecipitation of [(125)I]epibatidine binding sites with mAb 270 in select regions of nicotine-treated mice was nearly quantitative, although somewhat less so with mAb 299, confirming that the mAbs effectively recognize their targets. The patterns of change measured using immunoprecipitation were comparable with those determined autoradiographically. Thus, increases in α4β2*-nAChR binding sites after chronic nicotine treatment reflect increased nAChR protein.

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  • Chronic nicotine administration increases predominantly the α4β2 subtype of nAChRs in rodent brain.

    “Immunoprecipitation with subunit-selective antibodies and studies in genetic knockout models demonstrate that chronic administration of nicotine increases predominantly the ␣4␤2 subtype of nAChRs in rodent brain (Flores et al., 1992;Mao et al., 2008;Moretti et al., 2010;Marks et al., 2011)”

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Authors
Marks, M. J., McClure-Begley, T. D., Whiteaker, P., Salminen, O., Brown, R. W. B., Cooper, J., Collins, A. C., & Lindstrom, J. M.
Affiliations
  • University of Colorado Boulder (US)
  • Barrow Neurological Institute (US)
  • University of Helsinki (FI)
  • Lancaster University (GB)
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
2011-04
Volume
337
Issue
1
Pages
187-200
ISSN
0022-3565 (ISSN-L)
OpenAlex
W2112940546
Cited by
70
References
40
Citations by year
2023: 2 · 2021: 4 · 2020: 1 · 2019: 4 · 2018: 2 · 2017: 5 · 2016: 7 · 2015: 10 · 2014: 8 · 2013: 9 · 2012: 13
FWCI
4.54
Type
journal article
Language
en
Open access
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute on Drug Abuse (DA 015663, P30DA015663, R01DA003194, DA003194)
  • National Institute of Neurological Disorders and Stroke (R01NS011323, NS011323)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
nicotinic acetylcholine receptors, chronic nicotine treatment, receptor up-regulation, alpha4beta2 nicotinic receptor, receptor protein levels, agonist binding site, monoclonal antibodies, epibatidine binding, mouse brain, regional selectivity
MeSH terms
Animals, Binding Sites, Brain, Female, Male, Mice, Inbred C57BL, Nicotine, Receptors, Nicotinic, Up-Regulation, Mice, Knockout, Nicotinic Agonists, Mice

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